Release Notes for Version 2.89 Portability fixes were made to allow static builds with or without pkg-config. Static linking of the GSL library is now supported. Redundant templated imports are avoided. Release Notes for Version 2.88 Building against specific static libraries is supported again. An ambiguity in statistics.h was resolved. The output of dvisvgm is optimized by default. PDF 1.5 output is now generated. Release Notes for Version 2.87 Templated imports were implemented. An incorrect dvisvgm optimization is avoided. SVG gradient shading offsets were fixed. Integer are now implicitly formatted with full precision. Inferred assignment of void type is prohibited. An LSP segmentation fault was fixed. Repeated stripping of file extensions is avoided. The --output-directory option of latexmk is supported. The OSMesa compatibility profile is used for offscreen rendering. The fitscreen toggle is fixed. The context menu in Xasy is now only opened for GUI-drawn items. A -v3d option allows embedding V3D content within a PDF file. A workaround was implemented for a MacOS libc++ parsing bug. The documentation was updated. Release Notes for Version 2.86 PDF transfer functions are automatically applied; EPS output suppresses .setblendmode. NaN and inf values can be read in cvs mode. The OpenGL index buffer is properly initialized. WebGL and V3D primitives are used only when unscaled. Bugs in the inversion section of the geometry module were fixed. Portability issues were addressed. Release Notes for Version 2.85 Intersections of 3D paths with Bezier triangles were implemented. A workaround for broken offscreen graphics drivers was implemented. The icon resource file is now pregenerated. Uninitialized variables and a division by zero were fixed. The 3D animation timer and keyboard controls were fixed. A workaround for a linetype bug in the QtSvg library was fixed. Xasy now centers images upon loading. Compilation issues were fixed. The resolution of cputime().change.user was improved. Release Notes for Version 2.84 PDF image compression is now disabled by default for alternative output formats. The default UNIX postscript and PDF viewers were changed to evince. Makefile dependencies were fixed. A Qt compatibility bug was fixed in Xasy. A bug in XDR reads was fixed. A runtime error in the TexHead arrow was fixed. An inversion bug was fixed in the geometry module. A division by zero error in the vectorfield function was fixed. An option to display environment settings was added. The default labelmargin function now accounts for the pen linewidth. The resolution of the wall clock timer was improved. Release Notes for Version 2.83 WebGL triangle groups were fixed. Context menus were added to Xasy objects to allow one to edit the fill type, line type, color, line cap, and optionally add arrowheads. Support for begingroup() and endgroup() was added to Xasy. Scaling in the vectorfield function was fixed. A quotient(x,y) bug when -1 < x/y < 0, introduced in version 2.42, was fixed. Release Notes for Version 2.82 Support for Ghostscript 9.56 was added. Ambiguous functions are listed. The dvisvgmMultipleFiles option is now enabled by default. A bug in generating PDF labels was fixed. The mean color of multicoloured patches is output only for PRC code. Subdivision crack adjustments were disabled for transparent patches. The OpenGL transparency shader was further accelerated. WebGL bounding boxes are now computed by the client upon loading. Version 1.02 of the AsyGL library was released. Release Notes for Version 2.81 Schur decompositions were implemented. A bug in uniform() was fixed. The Xasy bounding box and a crash when opening Xasy files were fixed. The transparency offset buffer is zeroed when GPU compression is unavailable. The surface constructor for solids of revolution was documented. Support for pkg-config was added. Opaque rendering on platforms lacking GL_ARB_fragment_shader_interlock was fixed. Release Notes for Version 2.80 Compression of empty transparent pixel counts and other optimizations were implemented in the transparency shader. A weighted least-squares fit was added. Release Notes for Version 2.79 The transparency shader was further optimized. The tensorshade fillrule was fixed. A compatibility fix was made to xasyBezierInterface.py. A real operator ecast(rational r) was implemented up to maxDenominator=100000. The dvisvgmMultipleFiles option, which speeds up xasy deconstruction with PDF TeX engines, was documented. Release Notes for Version 2.78 The transparency shader was further optimized; an incorrect buffer size and export issues were fixed. A substitute was implemented for a missing strnlen function. Release Notes for Version 2.77 A buffer overflow in the partialsum transparency shader was fixed; the workload distribution over the GPU processors was improved. Release Notes for Version 2.76 WebGL and V3D bounds were fixed, along with the WebGL zoom and viewportshift. Under the Asymptote Web Application, the currentprojection is now persistent; for other WebGL instances, the 'c' keyboard binding can be used to display the currentprojection. The correct defaultfilename is set on reading V3D files from the command line. Portability issues were addressed. Release Notes for Version 2.75 A 2D transparency bug was fixed. Vim support was improved. To support PNG transparency, the default driver was changed from pngalpha to png16m and the pdflatex TeX engine is used instead of latex. A pngdriver option was added. To support WebGL, billboard labels are enabled when configured for offscreen rendering. The subdivision crack work around for PRC output was removed. Compilation without the tirpc library is supported again (but not recommended since the V3D format requires XDR support). Release Notes for Version 2.74 Order-independent transparency is disabled if SSBO support is unavailable. Embedded 3D renderings now work in inline TeX mode. The tiling pen was fixed. Support was added for filling contour plots by quantizing color density images. Unwanted shifting in PDF output when using non-letter size paper was fixed. Due to its limitations, the color.sty package was abandoned in favour of low-level specials. The bounding box contributions of the linejoin and linecap qualifiers are now correctly taken into account. The erase command is inhibited for svg and html output. A crash on save in the lsp server was fixed. Links to the gallery were fixed in the documentation. Release Notes for Version 2.73 The asygl library was updated to support embedding of WebGL and WebGL2 scenes on the same page. Release Notes for Version 2.72 WebGL2 is enabled by default only for examples that use image-based lighting. Multiple output formats in threaded interactive mode are now handled correctly. CPU partial sum indexing is used in the 3D transparency shader if the compute shader fails to compile. Release Notes for Version 2.71 Support for the portable compressed 3D vector file format V3D was added. The default value of settings.prc was changed to false. Efficient order-independent transparency was implemented for modern OpenGL platforms and the OSMesa offscreen rendering engine (with no interactive transparency support for Mac OS X and WebGL). The WebGL library now uses WebGL2 if available. Image-based lighting was implemented. Many bug fixes and improvements were made to Xasy, allowing objects drawn with the graphical editor to be saved to and restored from a .xasy file, as well as being exportable to an .asy file. A function was added to graph a parametric function with control points determined by the specified derivative. The recommended PostScript viewer for MSWindows is now Sumatra PDF. The workflow for generating transparent PDFs and PNGs was fixed. Emacs lasy-mode was patched to work with Emacs >= 23. Support for the Language Server Protocol was added. Compilation with COMPACT=0 is supported again. All threads now return the same error code. A remote command-line interface to http://asymptote.ualberta.ca is now available. Release Notes for Version 2.70 A stack overflow was fixed. Under MSWindows, problems with SVG generation and Xasy installation were fixed. Compiler warning messages were addressed. Release Notes for Version 2.69 A segmentation fault in subpath3 was fixed. The fuzz parameter in bezulate was increased to handle font precision issues. A missing above argument was added in plain_boxes.asy. Scaling bugs in the palette module were fixed. The contour module now respects picture scaling. Bugs in reading null fields were fixed. Orthographic scaling is now consistent with perspective scaling when keepAspect=false. The obsolete everypage package was removed. A compilation issue with LIBCURL and compilation warnings were fixed. Release Notes for Version 2.68 Floating point exceptions in OpenGL libraries are now masked. A normalization used to render tubes was fixed. A Label align(Label,dir) function was added for aligning label normals. A new settings.compress=true option controls PDF image compression. A bool isometry(transform) function was added. Various bugs in the geometry module were fixed. The transpose function ignores uninitialized elements. Null fields are treated as undefined values in cvs mode and in line mode. Uninitialized rendering variables were fixed. A RELEASE variable was added. Logarithmic graphs of surfaces are supported. Files are opened without assuming an asy suffix. Support for Ghostscript 9.53 was implemented. The end argument of Margin functions is now optional. A function cputime().change.clock that returns the high-resolution elapsed wall clock time was added. A --disable-curl option was added. The centering of slides was fixed. Null characters and null strings are supported in the replace function. Configuration without readline support was fixed. In binary mode, an entire file can be read into a string. The getc function now works properly when reading the NUL character. Reproducible builds are supported. Release Notes for Version 2.67 Support was added for importing and inputting URLs. Compilation and 2D SVG to HTML conversion no longer requires the GLM library; 2D html output is fit to the canvas unless settings.absolute=true. Diagnostics for dvisvgm were enabled; SVG clipping was fixed. A -globalread setting (default true) was implemented. Files are opened using the search path, which now includes the examples directory. An invalid array dimensions error was fixed. A WebGL resize event listener was added; the + and - keys now zoom in and out, rather than expanding and shrinking the viewport. Remeshing on export is forced; unnecessary remeshing on zoom in AsyGL is avoided. The triple dir(path3, path3) function was normalized. The repositioning of OpenGL windows was fixed. The copy constructors for path and path3 were fixed. Asymptote errors no longer cause Xasy to hang. A numerical precision issue was fixed. A portable way of skipping whitespace was implemented; casts from empty strings now yield uninitialized values. Interrupt handling under MacOS X was fixed. A devicepixelratio setting was implemented. The error location is displayed in the console. Segmentation faults were fixed. The documentation was updated and the code was reformatted. A hang on exit under MSWindows was fixed. Obsolete encoding modules were removed. Release Notes for Version 2.66 A bug in the Bezier patch bounds was fixed. Vertex and material data are copied from the CPU to GPU only when necessary. The default Headlamp light was brightened. WebGL output is centered in the viewport, extending to the canvas boundary; the precision of planar Bezier surfaces was increased to avoid artifacts. Fullscreen mode has been fixed; the new default maxviewport=(0,0) specifies the screen dimensions. Camera adjustment was fixed. Problems with Xasy and interactive signals under MSWindows were fixed. A background color for both 2D and 3D images can be specified with currentlight.background. Offscreen rendering on headless machines has been reinstated; while the setting offscreen has been removed, one can again configure asy for either onscreen or offscreen rendering. Clipping was removed from the slopefield module. Functions mapArray, mapTemplate, real abs2(pair), and real abs2(triple) were implemented. The new Ghostscript transparency model requires Ghostscript 9.52 or later. The detection of TeX errors was improved. An array segmentation fault was fixed; array dimensions are checked. Flattened monochrome tensor patches with interior internal control points are now drawn as filled cyclic paths. PDF offsets were fixed, along with the auto-reload feature for Acroread. SVG support was improved; 2D images can now be output in HTML format using inline SVG code, to support the Asymptote Web Application, a new cloud service at http://asymptote.ualberta.ca. Release Notes for Version 2.65 A bug in rendering 2D preview images of a 3D scene was fixed. The 100-error TeX limit is gracefully detected, rather than hanging. A more accurate Bezier approximation to the sphere was implemented. An initial perpendicular direction can now be specified for the rotation minimizing frame for a path3; the previous direction is no longer cached between calls. Release Notes for Version 2.64 Discontinuities were removed from the rotation minimizing frame used for constructing tubes. A work around was implemented for an incorrect declaration in obsolete versions of the NetBSD readline header file. Release Notes for Version 2.63 A race condition in the AsyGL library was fixed. Emissive and shininess values can be overridden for vertex colors. Thin Bezier curves can be drawn with lighting enabled. Outline mode for 3D surfaces was fixed; outline and mesh mode were ported to WebGL. Degenerate surface normals were fixed. The octant1, hemisphere, and sphere surfaces were replaced by nondegenerate versions that render faster. The unitcone, unitfrustum, and DefaultHead3 arrowhead were simplified. A robust and more efficient tube routine was implemented; the PRC tube primitive was removed. WebGL compression was achieved by implementing sphere, disk, cylinder, and tube primitives in the AsyGL library. Patches are now split in both directions only when required. If the GNU Readline library is unavailable, the Editline library is used to at least support command-line editing, without history features. An MSDOS configuration issue was fixed. Release Notes for Version 2.62 A hyperbola(point F1, point F2, point M) function was added to the geometry module. Duplicate intersections are avoided. Errors in the texpreamble are handled gracefully, without hanging. Unwanted indentation under LuaLaTex was removed. The WebGL canvas is populated with the design width and height. The WebGL context is stored in the top rather than parent window. To avoid polling, WebGL images now draw directly. Zooming of embedded WebGL images is disabled until activated with a click or touch event, using ESC to cancel activation. WebGL usage comments now suggest embedding as an iframe rather than an object. The obsolete grffile package is no longer used. Typos in the documentation were fixed. Release Notes for Version 2.61 Bugs in the OpenGL driver were fixed. A work around for the WebGL singleton array optimization bug on the Intel GPU was fixed. OpenGL and WebGL attributes are now bound before linking the shaders. Bland's rule is implemented correctly in the simplex solvers. A missing data file was added. Release Notes for Version 2.60 Transparent WebGL backgrounds were fixed. A build issue involving the revision number was fixed. The locatefile function now returns the fully qualified file name. The htmlviewer uses the absolute path for all platforms; it is also used for displaying svg files. SVG output for embedded PNG, JPEG, and external vector EPS and PDF images is supported with the latex TeX engine and dvisvgm 2.8. The simplex solver was optimized. A pad function that pads a picture to a precise size in both directions was introduced. The xasy front end was ported to high-resolutions screens and handles Ctrl-C interrupts correctly. Objects can be positioned finely with the arrow keys while holding down the mouse button. The origin/center order and anchor names were fixed. A front/back detection bug in the solids module was fixed. The grffile package fixes issues with included file names. This release requires Version 1.34 of asymptote.sty (auto-generated). Release Notes for Version 2.59 OpenGL memory allocation and transparency bugs introduced in version 2.54 were fixed. Rendering efficiency was improved. In view of limited GPU resources, only the required material uniforms are passed to each shader. The WebGL vertex and fragment shaders have been moved to the asygl library. Multiple embedded images now share a single WebGL context and shaders, to work around browser limitations. A bug in 3D arrows was fixed. Unavailable material attributes are now ignored. Miscellaneous Python support files were ported to Python3. The obsolete maxvertices setting was removed. Release Notes for Version 2.58 Intersection points in geometry.asy are now returned in currentcoordsys; a numerical precision issue was also fixed. Ambiguous function signatures in geometry.asy are resolved by requiring explicit casts when converting general forms to special cases. The xasy editor selection is now consistent. Building the asymptote.so shared library is supported again. A bug in rendering indexed triangle arrays was fixed. Execution errors in support utilities are now handled gracefully. Due to current limitations of dvisvgm (2.7.4), graphic() can only display SVG output (used by the xasy vector editor) for external vector EPS graphics (embedded images, PDF, PNG, and JPG formats are not yet supported). Building under CYGWIN with X11 is supported again. The --version option lists both enabled and disabled features. The GLX library is explicitly linked if present. Release Notes for Version 2.57 Scenes with lighting disabled are rendered correctly in WebGL. Attempting to output HTML for 2D pictures produces an SVG file. A conditional was removed from the fragment shaders. A viewportshift option was added to the WebGL driver; the home (h) option now forces a remesh. The version number was removed from the local offline copy of asygl. A numerical degeneracy in the conic sections intersection routine was fixed. A workaround for the broken XDR headers under MacOS X was implemented. An issue with animations was fixed. The --version option displays a list of compiled-in features. Release Notes for Version 2.56 An array bounds error was fixed. WebGL output now supports background colors, including transparent backgrounds. Preprocessor conditionals were fixed. Scrolling of webgl images is now disabled within the viewport. Release Notes for Version 2.55 An initialization bug in the OpenGL renderer and portability issues were fixed. Release Notes for Version 2.54 Support for generating and embedding interactive 3D WebGL vector graphics within an HTML file has been added, allowing Asymptote figures to be displayed on modern mobile and desktop browsers. The OpenGL rendering routines were further optimized, yielding higher frame rates and lower memory usage. The view position for perspective projection was fixed. The default value of file word() was fixed. Installation issues were addressed. A new digits setting controls the default output file precision. A hanging pipe was fixed. The popcount function was extended to systems that lack 64-bit integers. The order of PRC quad colours was fixed. If lighting is enabled, vertex colors are now ignored in PRC images; when drawing a surface s, use draw(s,prc() ? nolight : currentlight); to disable lighting manually and recover the old behaviour. Release Notes for Version 2.53 A memory leak and antialiasing artifacts in the 3D rendering engine were fixed. For PRC content, oblique projections are now converted to orthographic projections. Portability issues were addressed. Release Notes for Version 2.52 Under MacOS X, 3D rendering is supported again, the xasy menubar is now visible, and the default PostScript previewer was changed to "open". VISUAL, EDITOR, and OS-specific editor overrides are now supported in xasy. Obsolete code was removed and spelling mistakes were fixed. Release Notes for Version 2.51 Portability fixes for FreeBSD x86 and MacOS X were made. Release Notes for Version 2.50 The Phong-Blinn lighting model was replaced by a physically based rendering model; the ambient attribute was removed. Various portability and build issues were addressed. OpenGL is supported again for both 32-bit and 64-bit MSWindows. Release Notes for Version 2.49 Portability issues and numerical precision issues were fixed. Release Notes for Version 2.48 The OpenGL code was modernized to use GLSL shaders. Transparent triangles of different materials are now sorted before drawing. The viewport option from the light function was removed. A workaround was implemented for the Ghostscript transparency extension -dSAFER bug. Bugs in the simplex method were fixed. Experimental offscreen rendering is now disabled by default due to NVIDIA conflicts. The min, max, minratio, maxratio, and intersection calculations were accelerated. A workaround was implemented for broken Intel GPU drivers under MSWindows. Release Notes for Version 2.47 Further shipout and scaling problems were fixed. Unused files were removed. Multiple-page documents now produce PS instead of EPS output. Release Notes for Version 2.46 The pen width is now accounted for in the bbox function. The relative alignment of a label to a path now transforms correctly with picture rotation. Various shipout issues were fixed. The ghostscript library location from the MSWindows registry is now ignored for compatibility with TeXLive. Release Notes for Version 2.45 The xasy graphical front end for Asymptote has been rewritten to support code reordering, using Qt5 and scalable vector graphics. An uninitialized counter was fixed. A stable=true option was added to sort. The restricted simplex method has been replaced by a complete simplex solver that handles general size constraints. The rpc library has been replaced by the tirpc library. The dvips utility is forced to respect EPS requirements again. The system ghostscript library is now used by default for dvisvgm. Make clean now removes GSL symbols. The MSWindows system path is no longer modified by the installer. A CLZ bug was fixed. Release Notes for Version 2.44 Floating point exceptions are masked again under CYGWIN, pending strtod bug fix (issue #65). Various portability issues were also addressed. Release Notes for Version 2.43 The real modulo operator was fixed. Vector SVG output is now supported for PDF tex engines. Compilation under MacOS X was fixed. Both 32- and 64-bit MSWindows binaries are now available. Release Notes for Version 2.42 Bitreverse and popcount functions were added. An overflow in the modulo operator was fixed. An asymmetry in angle(transform t) was fixed so that angle(yscale(-1))=0. Missing 3D underline characters were fixed. The MSWindows binary is now 64-bit. Release Notes for Version 2.41 The rendering of Bezier patches was improved. Minor improvements were made to perpendicular marks in the geometry package. A perl issue was addressed. Two unwanted temporary files are now removed after TeX processing. EPS output is now supported with all TeX engines. A workaround was implemented for the ImageMagick jpeg black background bug. Release Notes for Version 2.40 A partial workaround for the OpenGL transparency bug was implemented, by presorting transparent triangles of the same material. The examples were updated and a segmentation fault was fixed. Multisample detection, surface rendering, and crack filling algorithms were fixed. The default compilation flags now specify -std=c++11. Release Notes for Version 2.39 A workaround was implemented for the backwards incompatibility in the TeXLive 2016 graphicx package. Empty tick labels in graphs are now avoided. A paletteticks NoTicks option was added. Support for lualatex was improved. Renderers for Bezier patches and curves more efficient than those in the deprecated GLU library were implemented. Release Notes for Version 2.38 An integer division operator # was added. Control points in xasy are now correctly parsed. Longitudinal splitting in the revolution structure of the solids module was fixed. Portability fixes were implemented. The ncurses library is now only required with --enable-readline. A --disable-sigsegv configuration option was added. Release Notes for Version 2.37 The xasy graphical user interface now runs under both Python 2.7 and Python 3. Legacy versions (prior to 9.14) of Ghostscript can be supported by assigning settings.epsdriver="epswrite" (or by setting the environment variable ASYMPTOTE_EPSDRIVER to epswrite). The quiet flag suppresses noninteractive standard output when settings.verbosity <= 1. A progress function was added to the plain_strings module. The smoothcontour3 module was optimized to use Bezier triangles where appropriate, along with a built-in least-squares routine and an improved root finder based on quadratic interpolation. If settings.sysdir is empty, preference is given to a version of kpsewhich in the same directory as the executable for determining the correct sysdir. The handling of degenerate normals of Bezier triangles was fixed. Bugs in forking, integer formatting, dash adjustment, subpaths, and guide reversion were fixed. Version 1.30 of asymptote.sty (auto-generated) and version 0.35 (or later) of media9.sty are now required. Release Notes for Version 2.36 Bezier triangle patches have been implemented in place of degenerate Bezier tensor product patches. Surface rendering was improved. The configuration of the readline and gc libraries was fixed. The asy configuration directory is only created if localhistory=false. Patches are now sorted by projected distance. Animations were fixed by running LaTeX twice. The asy-mode.el headers were updated. Intermittent segmentation faults and floating point exceptions in the OpenGL renderer were fixed. Support for GSL 2.0 was added. A quite nan constant was added. Straight segments are no longer split in bezulate. Segmentation faults in tab completion were fixed. A work around for a clang 3.7.0 compiler bug was implemented. The smoothcontour routine was sped up. Several bugs in the file read routines were fixed. A bug in rest argument signature equivalence was fixed. Threads are no longer used in batch mode, except under MacOS X. A convenience function graphicscale was added for using graphic with the ConTeXt tex engine. The splinetype detection for Spline surfaces was fixed. Release Notes for Version 2.35 A work around was implemented for a ghostscript eps2write bug that forces all postscript to the first page, breaking multiple 3D XeLaTeX and ConTeXt labels. Release Notes for Version 2.34 The readability of named pen colors was improved in the documentation. A surface cone(path3 base, triple vertex) routine was added for constructing an approximate cone over an arbitrary base. A test for Ghostscript 9.14 or later was added to the build process. The documentation was updated. A CYGWIN warning message under Windows 8 was fixed. Release Notes for Version 2.33 A work around was implemented for the missing epswrite driver in ghostscript-9.15. Deconstruction is now always done in the C locale. A work around for a unit change in dvisvgm-1.5.3 was implemented. The path arc(pair B, pair A, pair C, real r) function was fixed. The handling of the boolean condition in parametric surfaces was fixed. The default meshlight was changed to nolight so that mesh lines with positive width appear consistent with the default mesh lines. A nonsquare image dimension error was fixed. The definition of the SimpleHead arrowhead was fixed. The zoom/menu button and play option were fixed. An intersect(path, surface) function was implemented. A smoothcontour3 module written by Charles Staats and leminiscate example were added. The inline asymptote.sty option now works with xelatex. An obsolete workaround for an Adobe Reader transparency artifact was removed. An asylatexdir option was added to support the pdflatex -output-directory option. An aligndir option for aligning the picture to an arbitrary point of the page boundary was added. The garbage collector was updated to gc-7.4.2. The documentation was updated. Release Notes for Version 2.32 The libc++ stringstream workaround was also enabled for FreeBSD. The segment(bool[] b) function was fixed. The side(pair,pair,pair) function was renamed to orient(pair,pair,pair) and an error in its documentation was corrected. New functions orient(triple,triple,triple,triple) and insphere(triple,triple,triple,triple,triple) were implemented. A random number generator incompatibility on some platforms was fixed. Support was removed for the obsolete utility texi2dvi4a2ps. Compiler warnings were suppressed. Release Notes for Version 2.31 Hangs in 3D font generation and also in the "none" tex engine were fixed. Release Notes for Version 2.30 Compilation issues were addressed. A workaround for the broken stringstream container in MacOS 10.9 libc++ was implemented. The OpenGL zoom/menu button was fixed. Release Notes for Version 2.29 The TeX bidirectional pipe was overhauled to support the context tex engine again. The luatex and lualatex tex engines were enabled. The inline option used by the asymptote.sty LaTeX package and the inlineimage option used for generating external PRC files were fixed. Portability issues were addressed. Release Notes for Version 2.28 A locale bug that interfered with the 3D PRC camera transformation was fixed. Minimum OpenGL window constraints were removed in favour of the viewportsize variable. The transform(u,v,O) function, which projects onto the plane spanned by u and v through point O, was fixed. Numerical overflow issues in quadraticroots and cubicroots were fixed. The documentation was updated. Release Notes for Version 2.27 Move Adobe transparency workaround to C++ code to allow use of texpreamble again with the pdflatex tex engine. Release Notes for Version 2.26 The xasy graphical user interface now terminates the asy process on exit. The xasy code editor under MSWindows was fixed; the default code editor is now winpad. Degenerate HookHead and SimpleHead arrows were fixed. Portability issues were addressed. Release Notes for Version 2.25 A superfluous play button in rendered 3D images embedded by recent versions of media9 is now suppressed. The contour.asy module was reverted to a previous stable linearized version. A numerical precision issue in makepen was fixed. A routine for drawing braces was added. Deep recursion is now avoided in guide flattening. A workaround for an Adobe Reader transparency artifact was implemented for the pdflatex and xelatex tex engines. Raw PRC output can now be generated with the "-f prc" command-line option. Vector patches are now sorted to work around opacity artifacts in many rendering engines. The xasy code editor now accepts command-line options. Under MSWindows, the ghostscript library is searched for in both the 32 bit and 64 bit registries. The FAQ and documentation were updated. Release Notes for Version 2.24 A segmentation fault in drawSphere was fixed. Recursive calls to simpson are now supported. The explicit libglapi dependency was removed. A latexmkrc example file that shows how to store figures in a subdirectory is now included. Release Notes for Version 2.23 Compilation without the FFTW library is now supported again. Release Notes for Version 2.22 Self-defined unary operators are now allowed. Formatted strings instead of real values are compared in OmitFormat. The segment(bool[]) function was rewritten to use the more efficient segmentlimits(bool[]) call. Unnecessary buffering of surface and path3 data was removed. Portability tweaks were made. References to out-of-date trembling examples were removed. Vertex-colored triangles now work again in Adobe XI. The transformation of normal vectors was fixed. PostScript extend qualifiers were added for axial and radial shading. The TEXMFMAN environment variable is now used to find the TeXLive sysdir. Release Notes for Version 2.21 Explicitly transformed billboard labels now work correctly again. The alignment point of OpenGL billboard labels was fixed. An extend parameter was added to the axes (default true) and axes3 (default false) routines. A history recall bug was fixed. A typo was corrected in the documentation of the Jacobi elliptic functions sncndn. Release Notes for Version 2.20 A work around was implemented for a dvipdfmx bug that prevents the xelatex tex engine from properly embedding PRC objects. Billboard rotation is now disabled for explicitly transformed labels. Release Notes for Version 2.19 Numerical resolution issues with the PRC camera orientation and viewportshift were fixed. The lighting of NURBS surfaces was fixed. The special 8192 strlen NSIS build was now correctly reinstated, with stubs, to prevent the installer from overwriting Windows PATH environment variables > 1023 bytes. Release Notes for Version 2.18 A compilation issue on MacOSX was addressed. Secondary axes pictures now inherit the size of the primary picture, so that the markthin marker works properly. The special 8192 strlen NSIS build was reinstated to prevent the installer from overwriting extremely long Windows PATH environment variables. Release Notes for Version 2.17 A bug with non-square pen function images was fixed. Autoscaled logarithmic axes were fixed. Offscreen and non-offscreen rendering are now supported in a single binary (requiring OSMesa version 8), with settings.offscreen defaulting to false. The media9 LaTeX style file is now used to embed 3D PRC content instead of movie15. Local 3D coordinates are now used. PRC Part names are no longer generated by default. A bug in bezulate was fixed. A settings.axes3 flag was added to control the visibility of PRC axes. An efficient 3D routine for drawing many triangles, with specified vertices and optional normals or vertex colors, was implemented. Release Notes for Version 2.16 Ticks are no longer autoscaled when the number of major intervals is specified and autoscale is false. Manual tick scaling was fixed. A bug in the palette range was fixed. A division by zero in constructing curved arrows was fixed. A numerical underflow was fixed. A picture bound error was fixed. The current value of currentpen is now always respected in default arguments. A default viewportwidth is no longer imposed for attached images. A routine for computing camera positions was added. The format command is now more consistent with C++ printf formatting. Named arguments can now appear in function calls after rest arguments. The wheel example was improved to support PDF animations. The erase command no longer resets the machine state. Pipes are now used for xasy communication. A new mode parameter to input and output replaces xinput, xoutput, binput, and boutput. The icon directory path for 64-bit MSWindows systems was fixed. Compilation of native CYGWIN binaries is now supported. Release Notes for Version 2.15 A compilation problem under MacOS X was fixed. Release Notes for Version 2.14 Minor problems in the geometry module were fixed. Billboard interaction is now disabled for offscreen rendering. A markthin(path) marker with opacity thinning was implemented. A locale string was added to format(string,int). The copy, map, and sequence functions were generalized to arbitrary depths. Asymptote can now be compiled as a shared library. A tuple operator was added. The draw(revolution) function now defers drawing until the final camera position is known. Nonrendered preview images can now be generated for fitted pictures. String reads from binary files were fixed. An int ascii(string) function and a bool isnan(real) function were implemented. Jacobi elliptic functions were implemented. A quick reference card was added. Compilation and static initialization issues under MacOS X Lion were addressed. Release Notes for Version 2.13 Compilation and installation issues were addressed. Release Notes for Version 2.12 Minor compilation issues were addressed. Release Notes for Version 2.11 A new offscreen (software) 3D rendering option supports rendering on machines that are remote or lack a working video graphics card. Shifted pens now work correctly. The handling of whitespace in word mode file reads was fixed. A transpose argument was added to the pen function image facility, for consistency with the other image functions. The limit calculation of parabola and hyperbola was fixed in the geometry module. Release Notes for Version 2.10 PRC vertex-shading for straight patches was implemented. A general image routine that uses a pen function of two integer parameters was implemented. A 3D pixel routine was added. A temporary expression is now used to avoid side effects in self operators. Keyword-only function arguments were implemented. The sizing routines were recoded. Bugs in drawline and geometry were fixed. The geometry module no longer overloads the built-in circle and ellipse functions. PDF TeX engines are now supported in xasy. Directory prefixes are no longer stripped from .js and .prc file names. The TeXShop instructions were updated. The asymptote.sty LaTeX style file was updated to allow leading spaces before \end{asy} and to introduce a keepAspect keyval option. Segmentation faults were fixed. Unwanted state-dependency was removed from the startTrembling function of the contributed trembling module by introducing a tremble structure (backwards incompatible change); see the example floatingdisk.asy. Release Notes for Version 2.08 Legend markers now work again. Release Notes for Version 2.07 The -P option required by ghostscript 9.00 was added. The limits command now works correctly with reversed axes. The asyinclude command of asymptote.sty was improved so that asy source files do not need to be sent to publishers; the asy extension is now optional. A mktemp function was implemented. Further MSWindows installer problems were addressed. Release Notes for Version 2.06 Compilation problems and build issues were fixed. Release Notes for Version 2.05 Arbitrary depth array constructors were re-instated. Profiling code was added. Spaces within file names and eps file attachments are now supported in inlinetex mode, and interference from any pre-existing aux file is avoided. A new auto-generated version (1.21) of asymptote.sty contributed by Will Robertson features a latexmk-compatible asyinclude command. Path-overwriting bugs in the NSIS MSWindows installer were circumvented. Release Notes for Version 2.04 Subdivision cracks in transparent labels are no longer filled. Warning messages from the FP package are suppressed. MSDOS line terminators are now handled; DOSendl and DOSnewl line terminators were added. Files generated in inlinetex mode can now be renamed without editing their contents (using asymptote.sty version 1.19). The man page was fixed. The documentation of render.merge was fixed. Release Notes for Version 2.03 An optional asydir parameter that allows asy files to be generated in a subdirectory was added to version 1.18 of asymptote.sty; XeLaTeX support was fixed. Nonrendered preview images via render=0 are now implemented. Blank 3D labels were fixed. Problems with arc directions and ellipses in the geometry module were fixed. The definition of the Dotted linetype was improved. Missing pen and margin parameters were added to the blockconnector function calls. Virtual methods were optimized. Makefile dependencies were fixed and autogenerated files are cleaned up. The dependence of the source tarball on perl was removed. Minor improvements were made to the documentation and man page. The Asymptote installation directory is now automatically added to the MSWindows path. Release Notes for Version 2.02 A global latexusage.asy file is no longer generated, in favour of individual latexusage-*.asy files (this is a backwards incompatible change). Global and local values can now be given for both the inline and attach asymptote.sty (version 1.15) options. Underscores were removed from the .pre and .tex file names in inlinetex mode. Latexmk support was added for compiling individually only those figures that have changed; this requires that the inline option be used for 3D figures. The asy() function was fixed. A multiple fraction bar bug in texpath was fixed. Warning messages and portability issues were addressed. A frame label alignment problem was fixed. PDF animations are now supported with the XeLaTeX TeX engine. Release Notes for Version 2.01 The normal vector for perspective projections was fixed. Individual processing of each figure within a LaTeX document is now supported. The fontsize package uses type1cm.sty again since fix-cm.sty does not appear to work as advertised. Uninitialized item bits are cleared. Extended for statements now support the var type. PenMargin is used in drawing a binarytree. Minor optimizations were made. Release Notes for Version 2.00 The construction of 3D TeX labels was sped up greatly. Plain TeX page numbers were suppressed. Dotted 3D lines and 3D sizing problems were fixed. A general search function for sorted structures was implemented; the lexorder functions in math.asy now return strict partial orders. Additional GSL functions were added. The correct PRC units (PostScript pt units, properly called bp) are now displayed in Adobe Reader. Release Notes for Version 1.99 A segmentation fault was fixed. Perspective animations were fixed. A bug in the bezulate topological sorting algorithm was fixed. A framedelay setting was added for working around OpenGL animation rendering buffer overruns. Further optimizations were made. A portability issue was addressed. Release Notes for Version 1.98 Memory usage and garbage collection were greatly improved, and many optimizations were made. Labels are now aligned using the rotational instead of the shiftless part of the transform. A portable CYGWIN memory limit fix was implemented. Noncyclic strokepaths are discarded to work around a bug in gs 8.71. Release Notes for Version 1.97 A new render.labelfill option (enabled by default) fills subdivision cracks in unlighted labels. The dependence on gcc-4.3 was removed. Offscreen detection and zoom bugs in the OpenGL renderer were fixed. Three-dimensional grouping was improved. The symbol table was replaced with a custom hash table. Portability updates were made. The Cygwin memory limit fix for MSWindows now works even on systems that lack a complete Cygwin installation. The examples were updated to exploit the new PRC rendering options. Release Notes for Version 1.96 The viewpoint function and some examples were updated. Release Notes for Version 1.95 The PRC driver has been overhauled to support model tree groups, lossy compression, efficient representations of elementary geometrical objects, and specialized rendering options. More efficient OpenGL thick tubes were implemented; the capping of 3D curves was improved. The SIGQUIT signal was replaced by SIGTERM. Under MSWindows, the 384MB Cygwin memory limit is now automatically disabled by the Asymptote installer. Inferred variable types were added and operator symbols are now pretranslated. Release Notes for Version 1.94 Workarounds for MSWindows registry problems and obsolete runtime libraries were implemented. The SimpleHead arrowhead was fixed. Additional matrix routines and casts were implemented. The pair dir(path, path) routine now returns a unit vector. Variable conflicts coming from the contour module were addressed. A RadialShadeDraw filltype was implemented. A guide bug was fixed. Redundant mismatched version warnings are avoided. Support for fitting one 3D picture within another was added. The documentation was updated. Release Notes for Version 1.93 Portability issues were addressed. Latticeshading bounds and behaviour under svgemulation were fixed. The initial SVG pen was fixed. A parallelogram block was added to the flowchart module. Temporary files are cleaned up even after TeX errors. The GUI export function was fixed; an SVG export option was added. The XeLaTex bounding box was fixed. Spaces in output directory names are now allowed for supporting drivers. One can cd to other directories, preserving the output directory. All output files are written to the directory part of settings.outname; if this is empty, the current directory is used. Release Notes for Version 1.92 Labels work correctly with oblique projections. Transformed Label alignment and pt scalings were fixed. Latticeshading is now properly clipped. The normal and true Circle calculations were fixed. The interface to the simpson integrator and an array index in contour.asy were fixed. In the flowchart module, the implicit cast from a pair to a virtual node was removed in favour of a block constructor. The ode integration routines now return a structure that includes the sampled time values; dynamic timestepping was implemented for solveBVP. New predefined tick modifiers were added. The CLZ and CTZ bit functions were implemented. PRC part names were fixed. The GL library is now explicitly linked. Memory usage was improved by configuring the garbage collector with --enable-large-config. Null 3D paths are ignored. Non-pdf output is supported for PDF tex engines. Portability changes for CYGWIN 1.7 were made. Release Notes for Version 1.91 The precision of the 3D perspective sizing routines were improved. The offset in transformed 3D labels with render=0 was fixed. 3D planar arrowhead gaps were fixed; a duplicate 3D arrow angle factor was removed. Pen width contributions to the box and ellipse envelopes were fixed. A more robust contour algorithm based on paraboloid approximation was implemented. A polargraph routine for arrays was implemented. Default font problems were fixed. The pdfborder={0 0 0} option was added to settings.hyperrefOptions; the hypersetup command is now used to avoid hyperref option clashes. The size of pngalpha images was fixed; the pngalpha driver is used only if antialias=2. The -alpha Off default convert option was removed in favour of convertOptions="-alpha Off". Inlinetex support for xelatex was updated. Picture transformations are now respected by latticeshade. The Bessel functions J and Y were renamed to Jn and Yn. An operator --(block, block) was implemented to simplify the flowchart syntax. The expression % expands to the last result returned at the interactive prompt. The GLU-1.3 library included in the MSWindows distribution was fixed. Release Notes for Version 1.90 SVG axial, radial, and emulated tensor-patch shading were fixed; the dependency on dvisvgm-0.8.7 was documented. Release Notes for Version 1.89 The draw, fill, and clip commands now pass raw SVG code directly to dvisvgm (version 0.8.6 required); zero-length paths are output as circles. Unsupported SVG elements are converted to PNG images; unimplemented SVG features such as Gouraud and tensor-patch shading can be (partially) emulated as vector elements using the -svgemulation option. The control point normalization of rational NURBS surfaces was fixed; 3D NURBS curves are now implemented. A problem with inlinemovie3 was fixed. The linetype pattern is now a real array: for backwards compatibility, a string is still accepted, but the return type of linetype(pen) is now real[] instead of string (backwards incompatible). The split routine was changed so that an empty delimiter splits on spaces, discarding duplicates. The palette routines are now guaranteed to generate at least the specified number of colours. PNG output produces a transparent background. Surface and path3 garbage collection was fixed. Release Notes for Version 1.88 Compilation without OpenGL was fixed. PRC billboard labels were implemented; settings.billboard was renamed to settings.autobillboard and by default enabled for all 3D labels. The surface constructor for embedding labels on surfaces now draws both the top and bottom faces by default. The meshpen, knot, weight, and color arrays are now properly cached. The example fequlogo.asy illustrates how to draw an arbitrary 3D background plane. The intermediate dvi file is now removed when producing SVG output. Improvements were made to the tutorial. Release Notes for Version 1.87 Support for SVG output was added (requires dvisvgm-0.8.4). Billboard labels were implemented for the OpenGL renderer. OpenGL animations were improved: reverse and step menu items were added, along with a framerate setting. An addStereoViews function and example stereoscopic.asy were added. The addViews function was generalized to handle any layout; the default layout was changed from ThreeViewsFR to SixViewsUS. PRC node names are now implemented for curves, surface, labels, and dots. OmitTick was generalized to omit both major and minor ticks. A graphicx.tex workaround was implemented to parse paths properly. A viewportsize bug was fixed. A memory deallocation bug was fixed. The ENDIAN test was fixed. The ucyclic and vcyclic parameters are no longer set for conditional surfaces. The erase() function clears the PostScript canvas again. A projection() function that returns the interactive camera parameters was implemented. A hyperrefOptions setting was implemented. The tutorial was improved. Release Notes for Version 1.86 PRC polygons were optimized. Surface memory usage was reduced. The automatic sizing of NURBS surfaces was fixed. A bug in the radius of curvature computation at nodes was fixed. The configuration test for the GNU readline library was improved. The naming of PRC parts was implemented. Release Notes for Version 1.85 Compilation is now supported again on platforms lacking OpenGL. Missing pen dimensions were added to a 3D picture sizing routine. The labelsurface routine was renamed to surface and extended to surfaces containing a single patch. Release Notes for Version 1.84 The perspective PRC viewportmargin was fixed. Unwanted spaces were removed from (version 1.10 of) asymptote.sty. Support for drawing PRC and OpenGL NURBS surfaces was added. Obsolete code, including an unwanted inline qualifier, was removed. A split structure that can be adapted for splitting intersecting patches was added, along with the example splitpatch.asy. Release Notes for Version 1.83 OpenGL animations, illustrated in glmovie.asy, were implemented. Viewportshift flicker was fixed. An empirical translation between OpenGL and PRC shininess was implemented. Splined parametric surfaces are now used to implement smooth thick lines and tubes. The projected bounding box calculation and angle calculations were fixed. A labelsurface function was added. The Headlamp light is now the default light; a light argument was added to shipout. Patches are now constructed with the usual orientation for a counterclockwise external path; the convention for tensor product shading was updated. Picture environments for TeX clipping are no longer nested. A texpath initialization bug was fixed. An ASYMPTOTE_HOME environment variable was added. Viewing was fixed for file names containing spaces. A picture sizing bug was fixed. An example of an inset graph was added. Type information for variables is now returned at the interactive prompt. Warning message suppression was improved; warnings in Asymptote code can now be disabled. The cyclic member of an array is now writeable; the obsolete cyclicflag and void cyclic(bool) functions were removed. File mode functions are now virtual members; this backwards incompatibility requires that line(file f) be changed to f.line(), etc. Release Notes for Version 1.82 Threaded exports were fixed. The texpath fontsize was fixed for PDF tex engines. A default currentprojection argument was added to transform3(projection). The -gray and -bw settings are now respected in PRC output. A consistent approximation is now used for drawing tube centers. Missing pt units were added to all fontsize examples. Release Notes for Version 1.81 A boolean targetsize option can now be used to draw 3D labels with the apparent size they would have on the target plane. The camera adjustment algorithms were fixed; the autoadjust flag is respected. Missing path3 functions such as endpoint(path3) were added. The doubleclick timeout under MSWindows was fixed. A workaround for a ConTeXT small font bug is illustrated in contextfonts.asy. File associations are now used under MSWindows for psviewer, pdfviewer, display, and animate. Single quotation marks are now allowed in filenames. Deconstruction is now only supported in PNG format; the xformat setting was removed. The example lmfit illustrates Levenberg-Marquardt nonlinear least-squares fitting. Release Notes for Version 1.80 The interface for changing the precision for XDR/binary files was simplified; file parameters can now be queried as virtual members. The zoom/menu action was improved to emulate a double-click and assigned again to the right mouse button; a left-button binding bug was fixed. New settings zoomfactor, zoomstep, spinstep, arcballradius, resizestep, and doubleclick were added. The OpenGL thread is now exited gracefully; idle state and other parameters are properly reset on quitting. Lighting is now initialized only in home(). Animations with global=false were fixed. An improved (and free) psview PostScript viewer is now suggested for MSDOS users. A mechanism for disabling annoying warnings like "writeoverloaded" was implemented. The documentation directory under TeXLive was fixed. Release Notes for Version 1.79 The perp vector calculation in the solids module was fixed. A bug in the mouse motion functions was fixed. A pan action (which differs from shift due to perspective distortion) was added to the OpenGl renderer; the Camera (c) menu item now outputs all camera settings. The default right mouse button mouse binding was changed from "zoom/menu" to "zoom". User-initiated exports no longer cause the renderer to quit. Dynamic time stepping was fixed in the ode module; the "integrate" routines now return the array of computed values. Operators == and != were added for all built-in arithmetic 2D arrays; a segmentation fault was fixed. The etc/fstab kludge for Cygwin 1.7 was removed. The configuration directory under TeXLive is now $TEXMFCONFIG/asymptote. Release Notes for Version 1.78 Thread locking issues were fixed. The linegranularity is now respected when drawing thick curved lines. A bug in FSAL ODE integrators when using a fixed time step was fixed. Missing miterlimit defaults were added. Xasy was updated to use Python 2.6.2 and Imaging-1.1.7b1 (which requires no alpha support patches). Obsolete patches were removed. More TeXLive build issues were addressed: the install-prebuilt target omits texhash and does not attempt to install PNG files for asymptote.info. A configuration problem with --disable-gc was fixed. The 3D mouse bindings are now customizable. Support was added for generating syntax highlighting for the KDE editor Kate. Release Notes for Version 1.77 Splined parametric surfaces were implemented; a bug in the Cartesian splined surface routines was fixed. An ode module for solving ordinary differential equations was added. A bug in maxtimes and mintimes was fixed. A Levenberg-Marquardt nonlinear fitting routine was added. The format command now returns TeX compatible output only in math mode. A path3 label alignment problem was fixed. The MSWindows support for TeXLive 2009 was fixed. Release Notes for Version 1.76 A bezulate bug was fixed. The resolution and caching of texpath were improved; for PDF tex engines, the basealign pen attribute is now respected. Support for OCG layers was added. Lights Headlamp and White were implemented; the predefined adobe light was removed. Holes are now handled in superpath-to-surface constructor when planar=true. A degenerate transform3 issue was fixed. The alignment of rendered and PRC images was improved; the angle for rendering absolute projections was fixed. Inaccurate TeX and ConTeXt font scalings were fixed. A texsize(string, pen=currentpen) function returns the raw TeX dimensions {width,height,depth}. A new version of asymptote.sty (1.07) fixes attach=true mode. Release Notes for Version 1.75 Issues with 3D labels and texpath, both in inlinetex mode and with the ConTeXt TeX engine, were resolved. A bug in bezulate was fixed. A partial workaround was added for the unimplemented -output-directory ConTeXt option (the current directory must still be writeable). The aspect ratio and viewportmargin calculation in module three was improved, with tighter 3D bounds. A bug in the intersections(path3, surface) routine was fixed. Release Notes for Version 1.74 An error in the surface bounding box routines was fixed. Path/surface intersection routines were added. PDF tex engines are now supported for 3D labels and texpath. The new ConTeXT tex engine can be used for both 2D and non-PRC 3D drawings. Projections LeftView, RightView, FrontView, BackView, BottomView, and TopView, along with an addViews function, were implemented. Portability fixes and various updates to support TeXLive builds were made. The dependence on currentprojection in label(Label, path3) was removed. The font command for LaTeX tex engines now requires all four NFSS (encoding, family, series, shape) arguments. Release Notes for Version 1.73 An alternative OpenGL background color can now be specified with the pen currentlight.background. A new textpath command allows 3D labels to be drawn with settings.texengine="none". Minor bugs in the geometry package were fixed. The interface to the vectorfield routines was improved. The autoadjust parameter was removed from orthographic projections; autoadjust=false is now always respected for perspective projections. Optional warn=true arguments were added to the polar, azimuth, colatitude, and latitude functions. A call to reportError interrupts execution again. A segmentation fault that can occur after file mode errors was fixed. Release Notes for Version 1.72 PostScript calculator function shading was implemented. Interactive camera parameters of the native OpenGL renderer can now be queried. The effective camera positions for oblique projections was fixed. Philippe Ivaldi's geometry_dev module was merged into geometry.asy; trembling_pi was added as trembling.asy. The GSL module was expanded. An extrude routine for labels was implemented. Rotated path label alignments were fixed. The alignment of 3D axis labels was fixed. The basealign pen now always typesets "ace" and "acg" at the same location. Arrow endpoint detection was fixed. A sysdir setting was added, along with an --enable-tetex-build configure option. The store argument of saveline is respected again. Left-justified trailingzero alignment was fixed; a signedtrailingzero specifier was added. Boolean conditions on linearly interpolated surfaces now suppress function evaluation. The adaptive algorithm used for rendering thick lines and tubes was improved. An ambiguity in the flowchart module was fixed. A patch is included to work around an MSWindows XP problem with 3Dgetview in the 2009/03/23 version of movie15.sty. A problem with spurious menu interaction zooming was fixed. The asy.bat MSWindows batch file now respects all command-line arguments. Release Notes for Version 1.70 A labelpath3 module for typesetting curved labels in 3D, contributed by Jens Schwaiger, was added. PenMargin2 was defined for use with planar arrowhead types like DefaultHead2. A center=false parameter was added to projections to allow one to automatically center the target within the bounding volume. The ambiguity in the surface function was resolved. Problems with spaces in filenames were fixed. Release Notes for Version 1.69 Internal patch degeneracies were removed by splitting. Bugs in the windingnumber and the intersection routines were fixed. The inside(path) routine was improved; a fillrule argument was added. The bezulate connect routine was improved. Bezulate is now automatically applied to path arrays: surfaces should be constructed directly, without first calling bezulate. A workaround for recent changes in the hyperref package was implemented. The divisor setting was replaced with purge(divisor=0). The calls to baseline in graph.asy were fixed. A miterlimit attribute was added to pens. Animation problems were fixed. Lighting problems with multiple exports and a quit deadlock were fixed. A new version of asymptote.sty (1.06) fixes an undefined \ASYbox. Release Notes for Version 1.68 Support for 3D inline pdf movies was added. Camera adjustment was fixed; the filesurface.asy example illustrates automated camera and target computation. A deadlock in the export loop was fixed. A new version of asymptote.sty (1.05) fixes the definition of \ASYanimategraphics. The handling of intersection fuzz was improved. The baseline routine was generalized. New paragraphs are now allowed in minipage labels. Some minor errors in the documentation were fixed. Release Notes for Version 1.67 Spurious annotation question marks in 3D PDF attachments were fixed; attached images are now printable. The asy environment defined in the new (1.04) version of asymptote.sty supports keyval options width, height, viewportwidth, viewportheight, and attach; the obsolete asyattach environment was removed. The default viewportwidth is the linewidth in inline mode and 0 in attached mode. Planar projected arrows were fixed. Automatic camera adjustment was improved. A minimum viewportsize can now be specified. The control points for cyclic segments produced by texpath were fixed. Overlap issues in planar surface patches were fixed. Surface constructors were simplified: the routine planar has been replaced by surface(path3) and in most cases there is no need to call bezulate directly. An Align constant was added. The parameter limits used in buildcycle were fixed. The intersection routines now respect the fuzz parameter. Segmentation faults involving null cyclic guides were fixed. Subpath now preserves the straight flag. Pictures containing graphs now transform correctly; unextended axes limits and tick selection were improved. Axial and radial shading respect now respect -gray. The animation prefix was fixed. An example of drawing a surface from irregular data was added. A work around was implemented for an intermittent hang on exit in the 3D native renderer. An auto3D option was added for controlling the poster option. The 2008/10/08 version of movie15.sty is now compulsory. The cd %USERPROFILE% command was removed from asy.bat. Release Notes for Version 1.66 An alignment problem with the pdflatex tex engine was fixed. Problems in the animations module were fixed, including a broken ImageMagick layers optimization. Optional direction arguments were added for three-dimensional bars. The appearance and alignment of the planar arrowheads DefaultHead2, HookHead2, and TeXHead2 was improved; they now accept an optional normal argument and respect the filltype. A transverse/longitudinal confusion was fixed in the solids module. The camera adjustment routine was improved and is now controlled by the autoadjust=true option for perspective projections; the user is notified when the camera is moved. The obsolete featpost3D.asy module was removed. Midpoint interpolation was reinstated for drawing contours. The Asymptote license was upgraded to the GNU Lesser General Public License. Release Notes for Version 1.65 The xelatex tex engine was implemented. Bugs in pdflatex output and the xelatex alignment were fixed. Release Notes for Version 1.64 Support was added for XeLaTeX PDF specials. The target point is not forced to be part of the control volume for absolute projections. The directory is now stripped from the animation prefix; generated PDF animations are no longer automatically deleted. New parameters xsize and ysize of the asyinclude function of the slide module are illustrated in interactive 3D examples in intro.asy. A Protein Data Bank example was added to illustrate the generation of predefined views. The slidedemo example was fixed. The license of the PRC code and tools was upgraded from GPL to LGPL. Release Notes for Version 1.63 Support was added for XeLaTeX (which requires a modified version of movie15.sty; note however that PDF specials are not yet implemented in dvipdfmx). The 2D contour routines were generalized to handle nonuiform lattices; interpolation artifacts are now avoided when the midpoint function values are unknown. The ncell parameter for 3D contours was replaced by nmesh. The complex gamma function was implemented. Interactive rendering of preview images is now properly synchronized. The bounding volume is now automatically expanded to include the target position. An interactive 3D surface of revolution example was added to slidedemo; rendered images are now automatically included when fitting non-PRC pictures. Duplicate beginclip/endclip functions in pstoedit.asy were removed and the pstoedit-3.45 patch was updated to fix compilation errors. Errors on EOF after reading 0 values are no longer reported. One-column legends are now handled correctly. Old-style constructors were replaced with operator init. An electromagnetic spectrum example was added. Release Notes for Version 1.62 Outputting PDF format to other directories was fixed. An int hex(string) function that casts a hexadecimal string to an integer and a pen rgb(string) routine that returns a pen corresponding to a given 6-character RGB hexadecimal string were added. In the dot routines, Label arguments were added and minor bugs were fixed. A parametric version of markuniform was added. Release Notes for Version 1.61 A workaround was implemented for a dvips misconfiguration in TeXlive 2008 that introduces unwanted %%BeginPaperSize commands into the EPS output. The -q option was reinstated; the asymptote.py Python module was fixed. The bezulate.asy module now enforces the same zerowinding fillrule as used by dvips. In solids.asy, a warning is issued if the silhouette routine is used in a fully 3d context. The freeglut extensions to support user-specified multisampling values were re-instated. A freeglut segmentation fault triggered by spurious window creation in the export loop was fixed. An aspect ratio problem was fixed. A string[] to int[] ecast was added. A Pentype function was added. The asydir() function was fixed under MSDOS. Release Notes for Version 1.60 An optional bool3 condition was added to the graph functions, allowing one to skip points or segment a graph into distinct branches, based on a user-supplied test (see the example gamma.asy). A gettriple routine was added. The interp function first promotes its pen arguments to the highest colorspace. Export exceptions are now caught gracefully. Under UNIX, xasy can now be run from a write-protected directory again. A work around was implemented for the inability of the movie15.sty package to handle spaces in filenames. Stack overflow diagnostics were improved. A read from pipe failure under MSDOS was fixed. Release Notes for Version 1.59 A missing filltype option for projected 2D arrowheads was added. The scaling of plain TeX fonts was fixed. Examples that mix 3D exporting and viewing now work properly. With the -nothreads option, the main process now waits for 3D exports to finish before proceeding. Conflicts in slide presentations were fixed; the asy(string) function assigns defaultfilename correctly. A bug in processing command-line options was fixed. Release Notes for Version 1.58 Two-dimensional arrowheads are now drawn automatically for 2D projections. ArcArrow3 routines were added. Standard pen arithmetic is now used in all colorspaces, so that interp(pen,pen,real) and Gradient(pen[] p) now work as expected. A Wheel palette was added and is used in the example gamma3 to indicate the phase of the complex Gamma function. A silhouette routine for solids of revolution is illustrated in the examples spheresilhouette.asy and hyperboloidsilhouette.asy. Problems with 3D axis label alignments were fixed. The example scaledgraph illustrates how to factor out an axis scaling. Interactive mode is now exited on EOF, unless exitonEOF=false. Support for open function signatures was added. A conflict between asymptote.sty and the breqn package was fixed. PNG images for the manual are now built in a separate directory so that they don't take precedence over PDF files. A problem with xasy under MSDOS was fixed. Release Notes for Version 1.57 The pdflatex texengine was fixed. The default MSDOS "start-in" directory is now %USERPROFILE%, for compatibility with the MSWindows Vista operating system. Temporary files are now generated in the directory specified by the -outname (-o) command-line option, so that write access to the current directory is no longer required. Various font size problems were fixed. The axis coverage calculation was improved. An object(Label, envelope, ...) constructor was added, along with support for object transformation and alignment. Clipping is now allowed across page boundaries; beginclip(picture, path[]) and endclip(picture) functions were implemented. Release Notes for Version 1.56 A bounding box bug in the latex texengine was fixed. The font scaling is now rounded to the nearest integer. The wait=true argument of shipout was fixed. The documentation of grid3 was fixed; examples of using grid3 with scale(true) were added. The handling of the asydef environment within Emacs lasy-mode was fixed. An asyinclude function for embedding 3D PRC graphs in slides was implemented. Release Notes for Version 1.55 A serious bug in drawing paths of length 0 that broke the dot(pair) routine was fixed. Problems in guide to path and path to guide conversions were fixed. A triple invert(pair) routine was added to invert a pair z onto the projection plane. The obsolete field of view factor was removed. Release Notes for Version 1.54 The filltype of three-dimensional labels is now respected when render=0. Multiple file batch mode under MSWindows was fixed. The reverse(guide) and guide examination routines were fixed. A reverse(guide3) routine was added. Curved cyclic paths of size 1 were fixed. Fork is now used by default under MSWindows pending stable CYGWIN POSIX thread support; this can be overridden with settings.threads=true. The need to remove latexusage_.pre along with latexusage-* and latexusage.aux when switching between latex and pdflatex usage was documented. Release Notes for Version 1.53 Forking problems under Windows 2000 were fixed and MS-DOS style path warnings were suppressed. Problems with PRC projection sizing and the rendering logic were fixed. The toolbar is now enabled by default within the asyattach environment. Two-dimensional transforms no longer prevent three-dimensional labels from being projected onto the initial viewing plane. Out-of-memory errors in the OpenGL renderer are caught again. The new tube module was documented and a trefoilknot example was added. Release Notes for Version 1.52 Support for generating PRC output on bigendian machines was added. Multisampling was improved: by updating the freeglut library to svn version 761, one can now specify an antialiasing pixel width with the parameter multisample, which is now an integer. The asymptote.sty and asycolors.sty files are now installed by default in $TEXMFLOCAL/tex/latex. The OpenGL renderer by default now uses POSIX threads instead of fork. A work around for the nonstandardized signature of gluNurbsCallback on various MacOS platforms was implemented. Planar vertex shading was fixed. A planar argument to surface was added. To work around rendering problems with some graphics cards, the window is now hidden only when iconify=true. A tube module was added. A setlocale segmentation fault was fixed. Now that we require a multithreaded version of the Boehm garbage collector, the installation instructions were updated for using the system version. An optional user=false argument was added to min(picture), max(picture), and size(picture). The dependency of asy-mode.el on the cc-mode.el source file was removed. Release Notes for Version 1.51 A separate multisample setting is used to control screen antialiasing; multisampling is now only enabled when viewing. The problem of multiple glInit calls is fixed. A more conservative multisampling patch for freeglut is supplied. The OpenGL process is now always forked for better performance. The last freeglut extension was removed. Release Notes for Version 1.50 Detection and support for the native glut library on MacOSX now allows Asymptote's adaptive OpenGL renderer to be used on all major platforms. The OpenGL renderer now supports antialiasing; a race condition and export problems were fixed. The new default value of maxtile=(0,0) denotes the screen dimensions. Lighting problems due to incorrect normal orientations were fixed. The up vector for embedded PRC output was fixed. A viewportmargin parameter was added to allow for a larger viewport. An iconify setting was added for UNIX systems that support rendering in an iconified state. An embed option (default true) was added to allow one to suppress the embedding of a rendered preview image. A new version of asymptote.sty (1.01) supports file attachments, which provide a better way of embedding 3D PRC files in a LaTeX document. The latexusage file prefix was renamed from latexusage_ to latexusage-. A numerical precision issue in the surface of revolution constructor was fixed. Support for three-dimensional dimension bars was added; PenMargin3 and DotMargin3 were fixed. The argument put=Above (put=Below) should now be replaced by above=true (above=false); this is a backwards incompatible change. Release Notes for Version 1.49 Issues with surface normals that led to incorrect lighting were fixed. By default, the mean(pen[]) routine now returns an interpolated pen with the minimum opacity of all given pens. A patch reverse(patch) function was added. The settings.keep flag is now handled correctly in texpath and strokepath. A cornermean function for surfaces was added. Several examples that illustrate patch and vertex shading were updated. Release Notes for Version 1.48 High-resolution OpenGL tiled rendering was implemented. Support for vertex-dependent colors was added. Centering of perspective projections was improved. Rendering artifacts in planar surfaces and thick lines were fixed. A Gradient palette that varies linearly over a specified range of pens was added. An improved surface constructor for convex three-dimensional paths was added; the planar constructor should now only be used for nonconvex paths. A DefaultHead2(filltype filltype=Fill) arrowhead was implemented, along with an optional filltype argument for HookHead2. New maxheight, hstretch, and vstretch parameters were added to legend(). A boolean user=true argument was added to the point(picture, pair) function; the framepoint routine was removed in favour of truepoint(picture, pair, user=false). A roundbox envelope routine was added. An antialias setting (default true) was added. A bug in xasy and an incorrect precontrol bug in write(path) was fixed. Compilation with standard glut for systems without freeglut is now supported. Release Notes for Version 1.47 Support for simple obj files and patch-specific surfacepens and meshpens was added. Surface constructors for triangles were added. Three-dimensional margins were implemented. Flat 3D arrowhead types HookHead2 and TeXHead2 were implemented. By default, 3D arrowheads are now always drawn with currentlight. A missing angle parameter in HookHead3 was added. Functions that construct a pen array from a given function and palette were added, as illustrated in the example elevation.asy. A bug in the cyclic path write functions was fixed. A strokepath(path g, pen p) function was implemented. A missing put argument in grid3 and a missing transform for projected 3D mesh lines were fixed. File prefix problems were fixed. Spurious "camera too close" errors were fixed. Tighter three-dimensional bounds are generated. Release Notes for Version 1.46 Support was added for embedding 3D PRC files within LaTeX even when settings.render=0. An error is now signalled if the user tries to render an image without freeglut library support. The Klein bottle example was updated to use lightgray instead of the new default surface color (black). The sphere animation example was updated to work with the new skeleton structure in the solids module. Release Notes for Version 1.45 Bugs in the solids of revolution and graph3 modules were fixed; longitudinal curves are split into front and back pieces. Min and max arguments were added to axes and axes3. Rendering artifacts are now avoided. When render=0, 2D and 3D objects are now sized consistently. The automatic camera adjustment was improved. Bugs in thick three-dimensional lines were fixed; thick lines are now drawn with fewer Bezier patches and 3D Linetype offsets are supported. The appearance of unitcones and arrows was improved. New arrowhead3 types HookHead3 and TeXHead3 were added. The default surface color is now black. New surface and path constructors were added. Secure options can now be queried as read-only settings. Release Notes for Version 1.44 Full interactive 3D support has been added to Asymptote, with the option of generating and embedding 3D PRC data in PDF files or rendering scenes directly with Asymptote's own fast OpenGL-based renderer. The implicit casts from 3D to 2D objects were removed (in favour of call explicit calls to project). A path[][] texpath(string s) routine was added to convert string into the paths that TeX would fill. Add boolean stroke parameter was added for shading (and clipping to) stroked paths. The Circle and Arc routines were fixed. Autoscaling of graph axes limits is now disabled by default. A path3 path3(path p, triple plane(pair)=XYplane) constructor was added; the path3 routines were moved to C++ code. Optimized and robust versions of the intersection, windingnumber, inside, and surface extrema routines were implemented. The lighting routines were replaced by the OpenGL model. Each Asymptote process once again uses a separate currentpen. A segmentation fault and an incorrect parameter in the Delaunay triangulation routine were fixed. This major overhaul of the three-dimensional graphics has necessitated a few backwards incompatibilities. The most significant change involves filldraw: filldraw(polygon(5),red); should be replaced by draw(surface(polygon(5)),red); Also, the solids module has been improved so that revolution a=revolution(O--X+Z,Z); a.filldraw(red,blue); is now more sensibly written as revolution a=revolution(O--X+Z,Z); draw(surface(a),red); draw(a,blue); Release Notes for Version 1.43 A new array(n, value) function returns an array consisting of n copies of value. Conditional drawing of surfaces meshes was implemented. Vector field support was improved. Graph tick selection without autoscaling was improved. By default, all 2D axes are drawn below existing objects. An interface for drawing contours on arbitrary nonoverlapping meshes was added. Optional support for Jonathan Shewchuk's more robust triangulation routines was added. The file precision setting can now be queried. A beep() function was added. The partialsum function now returns an array of the same length as its argument (backwards incompatible). Dash offset and font selection bugs were fixed. Modules to redefine LaTeX named fontsizes for 10pt and 11pt article documentclasses were added. Problems in asy-mode.el were fixed. A problem with label alignment was fixed. The international inch is now used instead of the U.S. survey inch. The code now compiles cleanly under gcc-4.3.0. Release Notes for Version 1.42 A routine was added for projecting a Label onto a given plane; an ambiguity in the three-dimensional scale routine was resolved. An inside(path p, path q, pen fillrule=currentpen) routine was added to determine if one path is strictly within another. Optional arrows were added to the slopefield routines. The movie function now generates multipage PDF animations when format="pdf" and global=true; a fit argument was added to support an optional filled bounding box for each movie frame. Casts were added between the hsv structure and pens. Bad casts from TeX bidirectional pipe are now caught. In inline latex mode, TeX headers are now output only when needed. A bug in the cancellation of text addition in xasy was fixed. The sticky bit is no longer set when creating the ~/.asy directory. The documentation and FAQ were updated. The dot(real[] a, real[] b) routine now returns the dot product of the vectors a and b; this introduced a backwards incompatibility: dot(x,y) should now be replaced with dot(pairs(x,y)). Release Notes for Version 1.41 Python-style array slices were added. The array virtual field A.keys returns the indices of initialized entries. The concat routine can now take an arbitrary number of arguments. The write functions now output nothing for uninitialized values instead of producing an error. A bounding path is stored in the object structure to allow connections to noncardinal boundary points. The buildcycle algorithm was improved. The expression dir(E) is a synonym for E. The visibility of unsplit solid slices is now properly resolved. A drawpen argument was added to FillDraw. The uniform(real a, real b, int n) function returns a uniform partition of [a,b] into n subintervals. Complex exp, log, sin, and cos functions were added. An interface to the internal adaptive simpson integration routine was added. History lines are now stored immediately after input (as well at exit, after stifling). Support for the HSV colorspace was added. The dependence of non-PDF animations on the animate.sty package was removed by renaming animate.asy to animation.asy (PDF animations still need to import animate.asy). Transparency groups are now respected by xasy. TeX diagnostics were improved. An obsolete function for drawing boxes on pictures was removed in favour of draw(Label,box). Release Notes for Version 1.40 Hatch widths for PDF output were fixed by disabling dynamic line width adjustment. A nurb-related bug in solid shading was also fixed. Release Notes for Version 1.39 In the animate module, a constructor bug was fixed and the temporary multipage pdf movie file is deleted by default. Release Notes for Version 1.38 For perspective projection, nonuniform rational B-splines (NURBS) are now approximated by adding additional control points to Bezier curves. Inline PDF movies can be generated directly within LaTeX files (requires animate package, version 2007/11/30 or later). SimpleHead, HookHead, and TeXHead (Computer Modern) arrow styles were added. FillDraw is automatically reduced to Draw for noncyclic paths. Empty clipping bounding boxes were fixed. The xasy diagnostic Console should now work reliably on all platforms. Graph and interpolation array length diagnostics were improved. The axes routines now take optional xlabel, ylabel, and zlabel arguments defaulting to empty strings. The autoformat axes tick label routines now try to add an extra digit of precision. Pen arguments were added to the flowchart block routines. A path&cycle operator was added. The read1, read2, and read3 routines now affect only the current operation. A -c (command) option and exit() command were implemented. Ambiguous expressions are now resolved by interactiveWrite (with a warning). A patch is included for fixing problems with the Asymptote backend for pstoedit-3.45. Release Notes for Version 1.37 The speed and useability of the graphical user interface has been greatly improved, including full transparency support under MSWindows. The intersections routine was fixed, and an optional fuzz parameter was added. A bug in the arrow routines was fixed. The 2D graph routines were improved when autoscaling is disabled, secondary axis bugs were fixed, and the automatic logarithmic axis coverage routine was re-enabled. Degenerate 3D reference vectors are now handled and the default 3D tick directions were improved. The array returned by intersections is now automatically sorted. A patch is applied to avoid out-of-memory segmentation faults with gc-7.0. A history(int n=1) function can be used to return the interactive history. Automatic semicolons are now added to the history. Locale bugs were fixed. A string[] split function was added. Installation, uninstallation, and diagnostics under MSWindows were improved. A marker dot routine was added. The output(s,update=true) function was fixed. Configure now uses a system version of Boehm GC if the recommended local version isn't present. Release Notes for Version 1.36 Recently introduced bugs in the tex(), postscript(), gsave(), and grestore() commands were fixed. Release Notes for Version 1.35 A hang in testing for the intersection of nearly identical paths in solids.asy was fixed. The numeric formatting of setdash arguments was fixed. Release Notes for Version 1.34 An innovative graphical front end to Asymptote (xasy) has been developed. Clipping of labels is done within a picture environment to avoid unwanted page breaks. The default LaTeX font is now package-dependent. The syntax was generalized to allow expressions such as (x). Comments are now supported when reading strings in csv mode. Nesting capacity overflows in arctime were fixed. The autoscaling of graphs for close minimum and maximum values was improved, the default tick format is automatically adjusted to make tick labels unique, and a general trailingzero format string was added. Improved, robust versions of intersect and intersectionpoints were implemented (based on a new routine intersections). A permissions bug was fixed. A filltype argument was added to the dot routines. Printer stack use was optimized by pruning unneeded gsave/grestore commands. Temporary EPS files are now removed in inline PDF mode. A discussion of the 3D generalization of Hobby's algorithm used in Asymptote was added (intro.asy). Release Notes for Version 1.33 Routines to find the 3D and projected 2D bounding boxes of Bezier surfaces were added to the surface module, along with the standard teapot example. Extended for loops were documented. The page numbering of slide presentations with stepping enabled was fixed. The int type is now a long long type (typically a 64-bit integer). Support for reading and writing 64-bit integers in binary and XDR modes and large file support were added. Input files are now opened in input-only mode. Multiple invocations of labelpath now work. A projection bug in the grid3 module was fixed. The search path order was changed: directories specified by the dir configuration variable are now examined before the .asy subdirectory in the user's home directory. User configuration files are ignored during installation. Some bugs in asy-mode.el were fixed. Texput files are removed again. A memory allocation incompatibility in the workaround for old, broken readline libraries was fixed. The framepoint and truepoint routines now work even when an exact picture size estimate is unavailable; a picture scaling bug was fixed. Writing to a file specified with -o /dir/file.eps is allowed again. A quarticroots solver was added, the cubicroots solver was improved, and a complex quadraticroots solver was added. A workaround for broken texi2dvi installations was implemented. Memory leaks were fixed. The garbage collector was update to gc-7.0; upgrading to gv-3.6.3 is also recommended. A segmentation fault in complement was fixed. Release Notes for Version 1.32 A recently introduced segmentation fault in subpath was fixed. The current directory can now be examined with cd() even if globalwrite is false. The cd path is now only written once in interactive mode. Further garbage collection improvements and leak fixes were made. Release Notes for Version 1.31 Garbage collection was dramatically improved, resulting in reduced memory usage and increased speed. The options -compact and -divisor and the function purge() were added to give the user more control over garbage collection. The array virtual member function delete() with no arguments explicitly deletes all elements of the array. An interpolate(real[][] f, pen[] palette) function was added for constructing the pen array needed by the latticeshade routine. A nullpath frame and picture sizing bug was fixed. LaTeX diagnostics were improved. A facility that does not rely on garbage collection finalizers was implemented for closing open files at the end of each asy process. Release Notes for Version 1.30 Constructors were added. Routines to allow access to guide components were added. The three-dimensional projection and contour routines were optimized. A tickmodifier NoZero and ticklabel format NoZeroFormat were added. A simplified gouraudshade interface was added. A linewidth bug was fixed. The array insert and delete routines were generalized. The new array virtual member "initialized" can be used to detect whether an element is initialized. All fonts are now automatically embedded in PDF files. Inline PDF animations now require version 2007/05/24 or later of the animate.sty package. General root solving routines were added. The implicit initializer for files is null. Boolean arguments were added to the image and shading routines to allow one to disable data buffering. The functionality of the readline routine was split into the routines history, readline, and saveline. Many fixes were made to the Emacs asy-mode.el. Release Notes for Version 1.29 Support for drawing surfaces described by the null space of real-valued functions of three variables was added. The dir command now works correctly for degenerate Bezier paths; an optional final argument can be used to examine incoming and outgoing tangent directions. Numerical overflow and precision issues were addressed. A piecewise monotonic spline type and example were added. Optional fillpen and legend entries were added to histogram. The "q" command quits in interactive mode only if there is no top-level variable of that name. Standard input of strings was fixed. Support for transparent PNG images in xasy was added. Animation support was upgraded to use the new animate.sty package rather than the interim pdfanim_temp.sty package. Release Notes for Version 1.28 TeX error handling was improved. A dvipsOptions configuration variable was added. A recently introduced bug in the XDR routine xinput was fixed. Compilation under the upcoming GCC 4.3 release is now supported. Nonglobal PDF animations, where each frame is separately scaled and written to a file, were implemented. Reading from standard input now works correctly even in the absence of a working readline library. A build problem under Fedora Core 5 was fixed. Parallel builds are now supported. Release Notes for Version 1.27 A Hermite spline graph interpolate type was added for smoothly joining sampled functions. The cycle3, tension3, and curl3 keywords were respectively renamed cycle, tension, and curl. Assignments no longer write the value at the prompt. A bug in longitudinal skeleton detection was fixed. The filloutside routine now works with paths that extend beyond the current boundary. The unit n-point cross function returns a cyclic path. The "append" argument of the output function was renamed to "update", which now allows both reads and writes to the data file. Negative arguments to seek mean relative to the end-of-file; a seekeof function was added. PDF animations can now be loaded from an external file. The TeX pipe handshaking was improved. TeXLive 2007 is now supported under MSWindows. A work around was implemented for a MikTeX bug in handling file names containing spaces. Release Notes for Version 1.26 The correct surface normal is now used when calculating lighting; a Klein bottle example was added. The front/back detection of the transverse skeleton of solids of revolution is fixed. A better camera-independent reference value for resolving path3 orientation is used. A 3D midpoint routine was added. Tick values for broken axes can now be autogenerated; broken logarithmic axes are also supported. A 2D aligned axes example was added. A patch that fixes a redisplay bug in gv-3.6.2 is included. Release Notes for Version 1.25 A new picture size routine, which maps specified user coordinates to a given final size, provides a convenient way of forcing the plotted subregion of a graph to have a fixed size. The correct surface normal is chosen when calculating lighting. The comment character can now be escaped when reading strings from data files (but is disabled when reading raw characters with getc). The new word file mode is useful for reading white space-delimited strings. PostScript output files are now explicitly designated as EPSF in the header line. The minimum width and height of flowchart blocks may now be controlled separately. Interpolation and knot theory modules were added. The usage of path vs. guide in the base files was standardized. Release Notes for Version 1.24 Structures now have implicit initializers. PDF animations are supported in inline tex mode by communicating the texpreamble to LaTeX. The asypreamble environment was removed in favour of corresponding Asymptote commands in the asydef environment. Default y tick values were fixed. The binary space partition now works correctly for projections from infinity; an arbitrary target point can be specified for perspective projections. A 3D version of the intersectionpoints routine was added. Unconditional binary logical operators & and | and bitwise integer functions AND, OR, XOR, and NOT were defined; the array boolean operators && and || were renamed to & and |. The PostScript clipping code was fixed. The angle(rotate(x)) routine now always returns x (mod 360). User debugging errors are now cleared. The fontsize package was updated to use fix-cm.sty instead of type1cm.sty. The Microsoft Windows registry is checked for both GPL and AFPL Ghostscript. A workaround was implemented for a pdflatex vertical offset bug. Segmentation faults in the Delaunay triangulation and image codes were fixed. Release Notes for Version 1.23 Microsoft Windows autoconfiguration has been implemented by querying the registry: Asymptote and the applications it depends on may now be installed in any location. The shipout command is allowed to write to other directories if and only if -global is true. An autoimport configuration setting was added. Importing the Gnu Scientific Library (gsl) now works on all platforms. A texpreamble environment to contain the LaTeX preamble for both LaTeX and Asymptote was added to asymptote.sty. A conflict with the French babel packages was fixed. Background picture sizing in the slide presentation package was fixed. Release Notes for Version 1.22 Problems with loading LaTeX packages and slide presentations were fixed. Non-static variables in every loop iteration are now allocated anew. Formatting under locales with nonperiod decimal separators was fixed, along with logarithmic tick labels near the machine epsilon. Concatenation of nullpaths was fixed. New path markers were added and the perpendicular symbol in the geometry module was improved. The skeleton routines in the solids module were split to provide finer control. Routines to facilitate drawing 3d contours were added. Reading portable XDR binary data into arrays works again; functions for reading and writing also in native binary formats were added. The TeX preamble is no longer output in inline mode. The TeX pipe is now aware of a previously generated aux file. Memory leaks were fixed. An inline limit is now imposed on old compilers to speed up compilation. Setlocale warnings are disabled unless debugging is on. A colorspace command for extracting the colorspace of a pen was added. An Asymptote introductory slide presentation was added and a user-written Asymptote tutorial is now cited in the manual. Release Notes for Version 1.21 Expressions entered at the interactive prompt are automatically evaluated and written to stdout. The routine intersectionpoints returns all intersection points of two paths. Bounding box computations of paths drawn with transformed pen nibs were fixed. Transparency and automatic colorspace promotion are supported when shading and drawing images. A grid3 module for drawing 3D grids and a binary tree module were added. Automatic tick computations were improved: the actual tick value is now passed to the ticklabel formatting routine, even for logarithmic axes. A tickmodifier routine gives users complete control over which of the auto-generated ticks actually get drawn. The contour drawing and filling routines were improved. A --where option makes --listvariables show where global functions and variables are declared. Emacs asy-mode was improved, including function source code lookup. An optional labelpath interface to the PSTricks pstextpath macro was implemented for drawing curved labels along paths. In inline latex usage, picture are no longer scaled by default (use \begin{asy}[\the\linewidth] to recover previous default of scaling to line width). A texcommand option was added to override the tex engine command name. The slide presentation module no longer forces pdflatex; bibliography support was added, figuremattpen was reimplemented, and the spurious vertical shifting of bullets was fixed. Compilation under AIX and IRIX systems is supported. Release Notes for Version 1.20 Explicit yaxis label angles were fixed. Loading and including diagnostics under the -vv option were improved. The Emacs asy-mode now respects TeX-electric-sub-and-superscript. The texpath configuration variable and diagnostics were fixed under MSWindows. Low-resolution palettes now display correctly. A routine to fill cyclic contours was added, along with the example fillcontour.asy. A command-line option to change the current working directory was added. The FAQ was updated. Release Notes for Version 1.19 Bezier surfaces were implemented, along with tensor and Coons patch shading. The cylinder function was changed to be consistent with the cone function. The intersect routine now returns an array of two reals. The unitsize, xunitsize, and yunitsize arguments of shipout have been replaced with a unitsize function. The seconds() function now works portably. Minor bugs in inside() were fixed; a winding number routine was added. The movie bounding box is set to the largest bounding box of all pictures. Portable high-quality embedded PDF movies are now supported, as well as portable external movies. An embedded U3D example was added. Alignment positioning transformation was fixed; a Rotate(pair) and a string(real x) routine was added. Flowchart routines and the labelbox and advection examples now work with pictures as well as frames. An add(picture pic=currentpicture, drawer d) wrapper was added; a picture rescaling bug was fixed. Tex error handling was improved. Optional bounds arguments were added to verbatim postscript and tex commands. Writing to only the local directory is allowed unless the -global (or -unsafe) option is specified. A final backslash continues a line on the interactive prompt; a new multiline option is convenient for cutting and pasting code in interactive mode. Clipping now sets the true size coordinates to 0. Memory usage was reduced. The documentation was updated, including a description of how to produce Debian binaries from RPM binaries. Release Notes for Version 1.18 A pen caching problem and clipping bugs were fixed. Bugs in interactive mode and in linemode string reads were fixed. The picture.scale() routine now guards against division by zero. The drawing of surface meshes was fixed. The minbound and maxbound functions were implemented also for arrays. The labelx, labely, xtick, and ytick routines respect the current graph scaling. The asycolors.sty file was updated to remove the pstricks dependency. The slide package now works with both latex and pdflatex; the colordvi dependency was removed. A nativeformat() function returns "eps" or "pdf", depending on the current tex engine. The pdf() and latex() functions are now visible. The usepackage and minilatex modules check for latex mode. Static variable allocation is now discussed in the FAQ. An image histogram and contour example was added. The diatom example was modified to illustrate interaction of fixed-sized and scaled coordinates. Release Notes for Version 1.17 A workaround for a garbage collection bus error under MacOS X was implemented. A uniform histogram routine was added to the stats module. New frequency binning routines were added. The argument order of the nonuniform frequency binning routines was interchanged for consistency (backwards incompatible). The FAQ was updated. Release Notes for Version 1.16 Inline LaTeX mode was fixed. The legend routine was generalized to allow multiple entries per line; an example was added. The truepoint function was renamed framepoint. A function truepoint that works like point but accounts for fixed-sized objects was added. The picture.calculateTransform function now returns the actual transform used for fitting in the case where only an approximate picture size was available. A 2d frequency binning routine was added to the stats module. A memory leak was fixed. Release Notes for Version 1.15 Graphics label bounds and incorrect path bounds in latticeshade were fixed. The LaTeX color package is now used for the latex and pdflatex engines, to keep them informed of the current color. A unitlength of 1pt is now enforced in inlinetex mode. In cases like 2D graphs where only an approximate picture size estimate is available, the transform is adjusted so that the fitted frame meets the size specification. The cube animation and binary space partition were fixed. The determinant of a singular matrix now returns 0 instead of an error. Temporary pdf files are removed. The gv patches were removed since these are included in the long-awaited gv-3.6.2 release. A workaround for a compilation problem under MacOS X 10.3.9 was implemented. A DIN 15 CAD package and new examples were added. Release Notes for Version 1.14 General affine transforms and clipping may be applied to TeX labels; bugs in label alignment transformation were fixed. The TeX engines latex, pdflatex, tex, and pdftex are supported. Separate xunitsize and yunitsize scalings are allowed. Graph axis bound communication was added to allow axes with ticks and unextended axes to be called on an empty picture. Path labels are drawn after the path (to support UnFill). Filltype definitions were standardized; a Draw filltype was added (for drawing a bounding box around a label). New filloutside routines were added. Images can be drawn for irregular mesh contours and two-dimensional pen arrays. Landscape slides automatically enable PDF autorotate option. A MetaPost buildcycle routine was added. Setlocale errors are ignored. The "Cannot write to venn_.tex" error under Windows XP was fixed. Very old readline libraries found on many MacOS X systems are detected. The editing mode asy-mode.el supports Emacs version 21. The option \usepackage[inline]{asymptote} is now supported under both latex and pdflatex. Release Notes for Version 1.13 Image and contour transposition conventions for matrices were standardized; resolution arguments were removed from the matrix contour routines. The bounding box is now correctly calculated for square pen caps. A bug in drawline was fixed. An up argument was added to the projection routines to specify the camera orientation. The definition and documentation of cone was fixed; surface function signatures were consolidated. New 3d examples were added. Legends and markers are now allowed when drawing superpaths. Zero page alignment no longer suppresses labels; bounding box fuzz was removed. Intelligent interactive auto-completion was added. If scroll is negative, an entire page is scrolled. Support for Adobe Reader annotations was added. Write without data arguments now works like write with data arguments. A list function displays all global functions and variables in a module. The Emacs asy-mode.el was improved. A FAQ was added. Release Notes for Version 1.12 PDF transparency was implemented. The documentation of Bezier curves was improved. Bounding box calculations now account for label scaling. A special case of the Step calculation in graph.asy was fixed. The function scroll(int) was changed to a setting; a quit (q) option was added to the scroll facility. To avoid an unwanted ghostscript window, gswin32c (rather than gswin32) is used by default for producing pdf files under MSDOS. Release Notes for Version 1.11 The defaultformat string is used again for graph tick labelling commands instead of an empty format string. A workaround for the broken libsigsegv-2.3 library that caused a premature exit(1) was implemented. An extra blank line at the end of 3D array writes was removed; 3D array transpose and copy functions were added. The realmult routine was moved to runtime and documented. The example embeddedmovie of embedding movies within PDF files was added. Overflow diagnostic messages during mpeg merges are now suppressed. A twice setting was added to resolve LaTeX references. The settings module is now globally accessible. Duplicate trace messages were pruned. Debugger breakpoints can now be set using a matching substring instead of a line number. Conditional breakpoints are now supported. Runtime errors and interrupts no longer reset the interactive environment. Release Notes for Version 1.10 Parametric surfaces were implemented and parametric graphs now respect picture scaling. Fill and FillDraw now work for markers and superpaths. A bug in reading strings from files was fixed. Support for MikTeX 2.5 and Autoconf > 2.59 was added. Asymptote and output filenames can now contain spaces. Interrupts are working again. A line-based debugger was implemented. Release Notes for Version 1.09 The workaround for the gv-3.6.1 option handling bug now supports earlier versions of gv, including gv-3.5.8. By default, Ghostscript version 8.54 is used by the MSWindows version to produce PDF files. Release Notes for Version 1.08 Resolution problems in the contour routines were fixed; null contour labels are now suppressed. Configuration problems were fixed; the malloc configuration checks were removed and the help command again knows the correct location of the manual. In the slides package, some stepping bugs were fixed, an institution field was added to the titlepage, and vbox support (say for aligned equations) was added. A colorless(pen) function that strips pen color attributes was added. A clean copy of the source files is now shipped. Release Notes for Version 1.07 This release implements uniform and irregular mesh contour drawing algorithms: contours can be individually labelled or filled using a colour density palette. The flowchart interface and alignment were improved. A slope fields package was added. The arrow size limiting code was fixed. Some bugs in makepen were fixed. Image and shading functions now respect the -gray, -rgb, -cmyk, and -bw options. Date arithmetic routines were added. Several small bugs in the graph routines were fixed. Custom three-dimensional projections can now be easily constructed. The public keyword is now the default permission modifer. A new keyword, restricted, makes variables readable but not writeable outside the structure in which they are defined (previous this was the default behaviour). A user-transparent work around for the backwards-incompatible command-line options of gv-3.6.1 was implemented. Various configuration problems were addressed to better support the Asymptote rpm for the Fedora Core Extras project. A cputime() function was added. Release Notes for Version 1.06 General flowchart routines and an example were added. Papersizes other than letter now work with -outformat pdf again. Performance was improved by avoiding unnecessary output flushing. An asycolors.sty package was added to make LaTeX aware of CMYK versions of predefined Asymptote colours. The default pdf viewer for MacOS is now "open". The -u option can now be specified multiple times on the command line. Optional x and y margin arguments were added to Fill. A reverse video option was added to slide.asy; titlepage and title by default call newslide, unless the currentpicture is empty. An argument was added to newslide to allow stepping to be turned off for that slide. The slidedemo example now generates any required eps files. A segmentation fault in eval was fixed. Release Notes for Version 1.05 Shaded and skeletal representations of surfaces of rotation were implemented. New oblique projections were added and bugs in the 3D graph routines were fixed. An argument reversal in one of the add routines was fixed. A clipping margin was added to unfill. General determinants were added. Sin, Cos, Tan, aSin, aCos, and aTan, which use degrees, are now built-in functions. The dash adjustment algorithm was improved. The cubicroots solver now works again when R=0. Internal operations are now added for all variable declarations of new arrays and functions. Automatic viewing can easily be turned off under MSDOS. Nonstandard paper sizes are now correctly handled. The C locale is always used when producing postscript patterns. Configuration problems were fixed. The editor customization files asy.vim and asy-mode.el were moved to the Asymptote system directory. Stepping of slide presentations can now be enabled from the command line. Many new tests were implemented. The examples were moved to the examples subdirectory of the documentation directory. RPM files are now released. Release Notes for Version 1.04 A convenient presentation slide package was developed. The misalignment of TeX and PostScript layers was fixed by giving includegraphics the exact bounding box. The overall bounding box was also fixed. The tension atleast command and the clipping of remote labels by unfill near the frame boundary were fixed. Permission checking for types was added. The new point-like truepoint function uses the actual current picture size. Locale support, the ', I, and F format specifiers, and custom pagewidth and pageheight settings were added. A Ticks specifier draws ticks on both sides of the path; format="%" also suppress tick labels for logarithmic axis. The linetype adjustment to the arclength was improved and can now be optionally disabled. Color names were systematized, including texcolors and x11colors. A general purpose user command-line option accepts arbitrary Asymptote code as a string. All duplicate path points in three.asy are now removed. A convenient fixedscaling picture sizing routine was added. Selected special functions from the GNU scientific library, DESTDIR support, and a Python module to access Asymptote commands were added. The legend skip is now based on the actual legend entry height, not the fontsize. A backwards incompatibility was introduced in attach, add, and legends (add and attach take arguments in the same order as label): attach(point(E),legend(20E),UnFill) -> attach(legend(),point(E),20E,UnFill). Release Notes for Version 1.03 Support was added for compiling under gcc-4.1.0. A memory leak in interactive mode was fixed. A procedure for using CJK fonts was documented. The return type of the three-dimensional intersectionpoint routines was fixed. A function for inverting 2D points projected from 3D back onto a specified plane was added, along with a solid geometry package with routines to draw cylinders. New xaxis(triple,real), min(guide3[]), and max(guide3[]) convenience functions were added. A Degrees function like degrees(pair), except that it returns 0 for a (0,0) argument rather than generating an error, was added. Interactive mode (without command-line editing or history) now works even in the absence of the GNU readline library. An upper limit (100000) on the number of calls to intersectcubics per cubic segment was imposed on the intersection routines. The documentation was updated. Release Notes for Version 1.02 Lighting was implemented for surfaces described by functions and matrices. A bug in the positioning of axis labels was fixed. The type of randMax was fixed. Configuration and diagnostics were improved; the "dir" setting in configuration files is respected. Under MSDOS, the configuration file is now %USERPROFILE%/.asy/config.asy; configuration settings now work as documented. On UNIX systems, installation can optionally be performed without root privileges. Errors thrown by the parser while reading the configuration file are now handled gracefully. The patches to pstoedit were removed since they are now included in pstoedit-3.44. Release Notes for Version 1.01 A bug in the surface plot of a matrix was fixed. A workaround was implemented for the broken GNU readline/history library under MacOS. Release Notes for Version 1.00 A pen bounds error was fixed. A bug in the linear equations solver was fixed. Images now transform properly and nonsquare images appear correctly. The legend argument of draw accepts a Label. An interface to the movie15 package for embedding movies, sounds, and 3D objects within a PDF file was added. A bug where nonsolid pen types were ignored was fixed. Missing xpart, ypart, and zpart functions were re-added. A segmentation fault in format was fixed. An interface to the GNU readline function was added to allow editing of input. A complement function was added. A bug in the 2D graph tick selection routines was fixed; xlimits and ylimits no longer crop data by default. For consistency, the "includegraphics" labeling function was renamed to "graphic". Release Notes for Version 0.99 A bus error and compilation error under MacOS X were fixed. If -debug is set, execution continues after the first error. The "make check" code was fixed. The contributed MacOS X binary site is now mentioned in the documentation. Release Notes for Version 0.98 Command-line options and configuration variables were reorganized into an Asymptote settings module, allowing default values to be set in ~/.asy/config.asy (~/.asy/options is obsolete). Command-line options can be negated by prepending -no to the option name. Type-dependent function and record operators are now added to the parent record. Execution stops after the first error in a runnable. Two- and three-dimensional array min/max functions for all ordered builtin types were implemented. Comments are now allowed within 3d data blocks. The base file plain.asy was split into many subfiles. The currentpen nib is respected. Warning messages are suppressed when shipping out an empty picture. The tick computation was fixed when xaxis and yaxis are called with explicit limits. The -t option was removed as it is no longer needed for generating inline tex files. Machine constants are now implemented as variables rather than functions. Release Notes for Version 0.97 An uninitialized pen transform bug was fixed. A workaround was added for a readline incompatibility under MacOS X 10.4.3. Incorrect and missing names for builtin function arguments were fixed. Duplicate functions were removed. Release Notes for Version 0.96 A MetaPost-style makepen function allows the default pen nib to be changed to any polygonal (possibly nonconvex) cyclic path. A unitsize argument was added to the shipout command. Three-dimensional lighting effects were added and illustrated with the Gouraud shading of a sphere. The MidArrow attribute was fixed. Builtin functions now have named arguments. Brackets are now part of the quote syntax. The write command was generalized to allow writing a list of vectors as columns. Drawing to standard output now works even when there are no labels. The -noView command was replace by -nView or -no View. Several segmentation faults were fixed. Custom axis types were documented. Release Notes for Version 0.95 A memory leak was fixed; garbage collection messages are now suppressed unless the -d option is given. In interactive mode, a reset keyword was implemented to restore the environment, except for the scroll setting. The interactive input command now does an automatic reset. A link was added to the GNU readline library documentation for customizing interactive key bindings. A hang in scroll mode on an end-of-file condition was fixed. To reduce LaTeX memory usage, the scalebox macro is used only where required. A legend problem was fixed. The documentation was updated. Release Notes for Version 0.94 A label bug arising from a conflict between some versions of the LaTeX pstricks and graphicx packages was fixed. Embedded LaTeX files are always run in quiet (-noView) mode. Frame loading issues with imported types (for example, with the triangle SAS constructor in the geometry module) was fixed. The command import graph is now an abbreviation for access graph; unravel graph. Release Notes for Version 0.93 The import scheme was completely redesigned, with new keywords access, unravel, from, and include. A true (rather than emulated) interactive mode and runtime imports have been implemented. The default pdf browser is now acroread; the pdf fuzz workaround for gv was removed. The tension3 and curl3 keywords were re-added; a surface graph routine for matrices was implemented. Problems with csv mode were fixed. The function defaultpen() was renamed to resetdefaultpen(). Integer division via quotient(int,int) is now consistent with the modulo (%) operator. Checks for integer overflow and erf, erfc, and gamma functions were added. More descriptive names latticeshade, axialshade, radialshade, and gouraudshade for the shading routines were chosen. Horizontal and vertical label scaling was implemented. Default command line style-parameters can now be stored in ~/.asy/options. The interactive history file is now ~/.asy/history by default unless -localhistory is specified. Outputting to standard output via "-o -" is now allowed. Release Notes for Version 0.92 Clipping now clips labels and all layers of a picture, not just the most recent one. A bug in precontrol and postcontrol was fixed. A ticklabel bug and precision errors at +/-1e-4 were fixed. An example of a "broken" x axis was added. A dot product now requires explicit pair arguments. The implicit cast from real to pen was removed. Straight flags are now preserved when using a path as part of a guide. An UnFill filltype was added for clipping underneath labels and legends. A struct marker was added to support arbitrary marker locations. Directories are no longer stripped from explicit output filenames. A function inside was implemented to test whether a point is inside a cyclic path. The routines inside, quadratic solver, and intersect in math.asy were replaced by internal C++ routines. A robust real cubic root solver was added. A floating point exception in complex powers when base is zero was fixed. Colinearity checks were added to the leastsquares routine. The interface to plane was changed to return a representation of the plane through point O with normal cross(u,v). The routine intersectionpoint was moved to plain.asy and a 3d version was added to three.asy. We now draw over existing TeX layers when doing 3d hidden surface removal. A 3d aspect ratio can now be specified. A gui() function and MSWindows support for xasy was added; this will require renaming "gui(" to "GUI(" in any existing .gui files. The dir argument of picture.fit() was moved to add(frame,pair) and attach(frame,pair): add(pic.fit(E)) -> add(pic.fit(),E). Release Notes for Version 0.91 Fixed GUI transforms: grouping should not depend on deconstruct flag. Release Notes for Version 0.90 Default function arguments are now evaluated in the scope where the function is defined, not in the scope of the caller. The depth handling of deferred TeX labels was fixed. The positioning of 3d axes labels was improved; an example showing tick and axis label rotation was added. A minimum value of fuzz in the intersect routines is enforced to prevent infinite loops. An error in the man page regarding the -t option was fixed. The write function was generalized to handle an arbitrary number of data values. Release Notes for Version 0.89 The processing of GUI files was fixed. User-specified ticks now work also with logarithmic axes. The arguments of LeftTicks and RightTicks were standardized; it is now possible to include a general string(real) routine to typeset each label. Logarithmic axes ranges of less than a decade are no longer upscaled when autoscaling is disabled. All references to the mailing list were removed from the documentation since the forum is now used in its place. The temporary included PostScript file suffix was renamed from "ps" to "eps". Release Notes for Version 0.88 The graph routines were overhauled to support both two- and three- dimensional axes, partitioning them uniformly in tick value space, not with respect to arclength. An empty format string is treated as defaultformat. A fuzz parameter was added to the intersect routines; these routines now work for points. Data file comments were implemented. The perpendicular routine now uses an alignment argument; scale(pair) was removed. An option was added to asymptote.sty to make all LaTeX symbols visible, along with a second optional string to Label for providing a size estimate for undefined labels. Numerous small bugs were fixed; the pstoedit patch was updated. The installation and instructions were improved. An environment variable for every external command was added. The argument order of the axes routines was standardized; a call like xaxis(min,max,"$x$",red,Bottom,LeftTicks); should now be written xaxis("$x$",Bottom,min,max,red,LeftTicks); Release Notes for Version 0.87 This release implements general hidden surface removal using a binary space partition and adds three-dimensional versions of the standard path functions (arclength, subpath, intersect, etc.), along with circle and arc functions. Hidden surfaces in regular mesh surface plots now are properly handled from any camera location. The arclength rather than the length is used for determining default label position on paths; Relative(real) and Relative(pair) functions were added for labelling paths relative to the total arclength and local path direction. Structure constructors and operators == and != were implemented and documented. The permissions of static functions within structures was fixed. A pen argument to filltype Fill to specify an interior pen distinct from the boundary pen was added. For convenience, array push members now return the pushed element. A missing shift in Label.out(frame) was added. The feynman module was updated to include a new function texshipout; MidArrow was moved to plain.asy. The optional position arguments of BeginArrow and related functions were fixed. A numerically robust quadratic equation solver was added. Release Notes for Version 0.86 Fixed make man problems. Release Notes for Version 0.85 A fully three-dimensional, rotationally invariant, generalization of the two-dimensional MetaPost path construction algorithms has been implemented. A tridiagonal solver was added. Adobe's automatic rotation of PDF files was disabled. Cyclic indices are now allowed only on arrays having the virtual cyclic flag set to true. The bug fix in simplex was generalized. An online help option was added to interactive mode; exit is now a synonym for quit. Microsoft Windows resource fields and an icon were added. ASYMPTOTE_DIR can now be a list of directories. Since some files were moved in this release, Microsoft users may wish to first uninstall the previous release to avoid duplicate files. Release Notes for Version 0.84 This release ports Asymptote to the Microsoft Windows operating system; an executable file is distributed. Label parameters are now in a structure called Label, to which strings are implicitly cast, and which can be rotated and shifted with a transform. Automatic sizing under picture transformation was fixed. A bug in the simplex method was fixed. Lattice and Gouraud shading were added. An array append method, virtual transform components, and transform 6-tuple notation were added. A pen and filltype were added to legend. The 2d graph and palette code were cleaned up. An extend option was added to draw ticks across the graph for producing a grid. Problems with nullguide3 were fixed, the arguments of 3d rotate were swapped, and 3d reflections were added. A spurious papersize comment inserted by newer versions of dvips was removed. Pstoedit support was updated. This release introduces a few minor backward incompatibilities. Here is a summary of the main changes: draw("text",(0,0)--(1,1),1.0) -> draw(Label("text",1.0),(0,0)--(1,1)) label("text",90,(0,0)) -> label(rotate(90)*"text",(0,0)) labeldot("text",(0,0)) -> dot("text",(0,0)) labeldot((0,0)) -> dot(Label,(0,0)) labelbox(2mm,2mm,"text",(0,0)) -> box(Label("text",(0,0)),2mm,2mm) xaxis("$x$",0.5) -> xaxis(Label("$x$",0.5)) labelxtick(1) -> xtick(Label,1) Release Notes for Version 0.83 This release extends Asymptote to three dimensions. A triple type (which replaces the old vector type in math.asy) and a guide3 type were added, along with the 3D projection routines in three.asy. Three-dimensional arrays can now be read in line mode, using blank lines as block delimiters. An array pop function was added. Math mode ($ delimiters) were moved to within the "defaultformat" string, to allow use of non-math mode fonts in tick labels (by overriding the default format). A pticklabel option for drawing tick labels with a different pen was added. Routines labelxtick and labelytick were added, and the tick size and shift in xtick were fixed. The autoscaling of unextended axes was fixed. The xline and yline routines were renamed to xequals and yequals, Dot was renamed to dot, Cross was renamed to cross, the function "Angle(pair)" was renamed to "degrees(pair)", and a "Degrees(pair)" function was added to math.asy. The MetaPost --- operator and the replacement :: for the MetaPost ... operator were implemented. A segmentation fault involving controls points with direction specifiers and a bug in "string font(pen)" were fixed. Tensions in straight sections of paths are now handled as in MetaPost. The -l option was reimplemented. Release Notes for Version 0.82 Initializers for structures and general cast operators can be specified. Functions can be called with named (keyword) arguments, in any order. Rest arguments are supported. Size and aspect ratio arguments, which may be specified with "size", were removed from "shipout". The tick routines were standardized; custom tick locations and arrows on axes were implemented. The default frame initializer nullframe was renamed to newframe. A segmentation fault in the file garbage collection code and an optimization-related bug in fill were fixed. Unlike in the C and C++ languages, an assignment in a function argument is now interpreted as an assignment to a parameter of the same name in the function signature, not within the local scope. The command-line option -d may be used to check Asymptote code for cases where a named function argument may be mistaken for a local assignment. Release Notes for Version 0.81 A guide solver bug was fixed, allowing the construction of graphs with a single data point. Compilation under g++-4.0.0 is now supported. Release Notes for Version 0.80 A segmentation fault on the alpha (cxx) and mac platforms was fixed. All members of the picture structure are now deep copied. The latest Boehm garbage collector (version 6.5) is used by default. Release Notes for Version 0.79 Types are now cached to speed up parsing. All outstanding garbage collection issues were addressed. The autoscaling of scaled axes was fixed. Another example of a secondary axis was added to the documentation. A Pythagorean tree example illustrates picture transforms. Release Notes for Version 0.78 A binary search routine was added for sorted arrays. The handling of NAN values was fixed. The "checkaxis" test in graph.asy was improved. A problem with implicit closing of files was fixed. Minor changes were made to support compilation under Cygwin. A workaround for the garbage collection warning about repeated allocation of very large blocks was introduced, along with other miscellaneous garbage collection updates. A configuration option was added to request use of a (slower, multi-theaded) system version of the Boehm garbage collector. Release Notes for Version 0.77 Integer arguments are now converted to real values before dividing and a real quotient is returned. The "quotient(int, int)" function returns the integer part of that result. Garbage collection has been implemented to fix memory leaks. A knot solving bug was fixed. Pen "plabel" vs. "p" issues were addressed. The eval function was renamed to map and the new eval(string) function was documented. The concat function can be used to concatenate two arrays. Complex exponential and logarithmic functions were added. The new function reltime can be used to compute the label position argument for draw. A new geometry module includes a triangle structure and functions to draw interior arcs of triangles and perpendicular symbols. Release Notes for Version 0.76 Installation has been simplified by removing the last remaining dependency on the boost header files. A "plabel" argument was added to "draw" to allow labels and legends to use a different pen than the curve itself. The pen arguments in the axes routines were rearranged to be consistent with "draw". TeX errors in interactive mode and the TeX preamble are now handled properly. New functions "getstring" and "getreal" can get and remember user parameters. Marker frame arrays, a "Mark(int)" function, and "node", "value", and "slope" path computation functions were added. Problems with implicit scaling were addressed. The "without side-effect" warning was removed. An option was added to list all loaded global functions. The documentation of structures was improved. Release Notes for Version 0.75 This release fixes a number of bugs with the new parser controller, including a segmentation fault with the -p option, problems with interactive mode, and problems reading from standard input. The graph module now uses a better default value of axislabelmargin for positioning axis labels. The put argument of the axis routines was moved to the end of the argument list, for consistency with draw. Convenient xline and yline interfaces to the axis routines were added. The definition of the correlation coefficient in the least squares routine was fixed, and a fit function was added to the 'linefit' structure. A linear interpolation (with endpoint extrapolation) and a binary search routine were added to math.asy. Release Notes for Version 0.74 This release fixes a segmentation fault in version 0.73 and also reduces the default number of colors in image palettes to work around PostScript/PDF limitations (that can cause the manual not to print). Release Notes for Version 0.73 A more efficient type-safe union was used to speed up the virtual machine by roughly a factor of 5. New routines "ellipse" and "labelellipse" were added for drawing ovals around frames and labels. The function "bbox(frame)" was renamed "box(frame)". These routines now prepend to the frame for filling with a background color; they also return the boundary as a guide. A workaround was added for a bug in gcc version 3.3 to facilitate compilation under Darwin (MacOS). Many internal coding improvements were made.