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2D scene graph based on SVG with OpenGL backend

Project Description

a 2D scene graph based on SVG with OpenGL backend

Goals & non-goals


  • 2D scene graph suitable for interactive rendering
  • minimal set of dependencies


  • full SVG implementation
  • optimized for speed


  • pythonic API modeled after SVG spec & semantic
  • SVG parsing and serialization
  • scale dependent polygonalization
  • analytical picking
  • sub-pixel strokes rendering enhancement through width and opacity correction
  • per-pixel gradients
  • two modes text rendering: raster by freetype2 for high quality AA at small sizes, vector otherwise

SVG spec


  • shapes: path, rect, circle, ellipse, line, polyline, polygon, image
  • text: (excluding decoration, text on path)
  • structure: group, use (including attributes inheritance)
  • painting: solid color, linear and radial gradients (including units, transform, spread, href);
  • fill: rule (nonzero, evenodd)
  • stroke: cap (butt, round, square), join (miter, round, bevel), miterlimit
  • multi-pass rendering: clipping, masking, object opacity
  • transforms: translate, rotate, scale, skewX, skewY


  • tspan
  • painting: pattern
  • stroke: dash, marker
  • filters




Optional dependencies

Needed to find fonts, fallbacks on FreeFont otherwise.

on the mac:


  • sauvage by S. Conversy
  • SVGL by S. Conversy & J.-D. Fekete
Release History

Release History

This version
History Node


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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
seagull-0.1.tar.gz (34.0 kB) Copy SHA256 Checksum SHA256 Source Mar 27, 2014

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