PyPI 官网下载 | svgbatch-0.1.9.tar.gz

svgbatch ======== The latest version of this documentation is online at: http://pypi.python.org/pypi/svgbatch SvgBatch is a Python package to load SVG[1] vector graphic files, and convert them into pyglet[2] Batch objects[3], for OpenGL rendering. [1] http://www.w3.org/TR/SVG11 [2] http://www.pyglet.org [3] http://www.pyglet.org/doc/api/pyglet.graphics.Batch-class.html The polygons from the SVG file are tessellated using GLU functions[4], and used to create a pyglet Batch object of indexed vertex arrays of GL_TRIANGLES. The Batch will aggregate all paths from an SVG file into a single OpenGL primitive for rendering. Each path is also exposed in its untessellated form, so the application could use them for things other than rendering, for example collision detection. [4] http://www.glprogramming.com/red/chapter11.html Currently only a subset of SVG is handled - paths forming closed polygons, filled with solid color. Each path may comprise multiple loops (disjoint areas or holes), but must be made up from straight line edges. Arcs, beziers, gradient fills and other SVG entities such as rectangles or text are not currently handled. Status ------ Nominally complete, and works with some simple SVG files that were generated by Inkscape[5], but has not yet been used in earnest. [5] http://www.inkscape.org Download -------- You can install svgbatch to your site-packages directory, making it available for import by all Python programs on your computer. The automated way to do this is to install setuptools, then use the command-line: easy_install svgbatch The manual way to do the same thing is to download the source distribution from the bottom of the project PyPI page: http://pypi.python.org/pypi/svgbatch and install manually, using the command-line: python setup.py install Alternatively, the svgbatch package from the above source distribution can be copied directly into your own project, which might be useful if you intend to modify it. Finally, to get the very latest (possibly broken) version, you might want to check it out from Subversion on Google Code: http://code.google.com/p/svgload/source/checkout Usage ----- Very straightforward:: svg = SvgBatch('data/logo.svg') batch = svg.create_batch() `create_batch()` returns a pyglet Batch object, which can be rendered in a pyglet program using `batch.draw()`. See `svgbatch/demo.py`: http://code.google.com/p/svgload/source/browse/trunk/svgbatch/demo.py Your application can access the untessellated geometry of each path, indexed by id, using:: path = svg.path_by_id['pathid'] where `pathid` is the string ID of the path tag in the SVG file. A path's ID can be set from within Inkscape by editing its object properties. The returned Path object has the following attributes: * id: string, copied from the svg tag's id attribute * color: triple of unsigned bytes, (r, g, b) * loops: a list of loops. A loop is a list of vertices. A vertex is a pair of floats or ints. * bounds: an object which provides the axis-aligned extents of the path, as xmin, xmax, ymin, ymax. * offset(x, y): a method which will add the given offset to all vertices in the path Known Issues ------------ * It generally chokes on real-world SVG files other than the small ones I'm saving from Inkscape, due to unhandled SVG entities such as rectangles or text. Avoid this by just using closed, straight-edged paths filled with plain color. * I've only tested it on Windows. My lappy graphics chipset doesn't work for OpenGL stuff on Ubuntu since Jaunty. Thanks ATI. Plans ----- See TODO.txt: http://code.google.com/p/svgload/source/browse/trunk/docs/TODO.txt Acknowledgements ---------------- Many thanks to Martin O'Leary of supereffective.org, whos Squirtle module[6] formed a major inspiration for this project, and in particular for his sublime tesselation code, which I have copied wholesale under the terms of the BSD. [6] http://www.supereffective.org/pages/Squirtle-SVG-Library This project's tests use voidspace's superbly useful mock library[7]: [7] http://www.voidspace.org.uk/python/mock