About celiagg

celiagg is designed to be a simple, stateless library for 2D vector graphics. Simple, because it provides a general API which should be simple enough to fit in ones head while still being a general solution for 2D vector rasterization. Stateless, because unlike Cairo or Quartz (for example), celiagg’s main drawing object (Canvas) holds the absolute minimum state required to do its job. Instead, the celiagg API includes a handful of stateful objects which are used to pass various drawing attributes to the methods of Canvas. In this way, it is more like Skia (but much simpler, of course).

High-level Overview

These are the main objects used for drawing in celiagg.

• Canvas: The object which has the main drawing methods. It also manages the frame buffer which is being drawn into.

• celiagg.GraphicsState: The main state container to be passed to all Canvas drawing methods.

• VertexSource: A family of classes which contain vector data to be rasterized. Includes celiagg.Path, celiagg.BSpline, and celiagg.ShapeAtPoints

• Paint: Another family of classes which describe the color and texture of lines and fills. Includes celiagg.SolidPaint, celiagg.PatternPaint, celiagg.LinearGradientPaint, and celiagg.RadialGradientPaint.

• celiagg.Transform: A 2D affine transform

• celiagg.Font: A single font, needed when rendering text.

• celiagg.FontCache: Needed to measure the size of rendered text.

• celiagg.Image: A container for raster image data.