gb.cairo

Cairo 是一个2D图形库，支持多种输出设备：图像、PDF、PS或SVG文件。

Cairo旨在在所有输出媒体上产生一致的输出，同时利用可用的显示硬件加速。

Cairo API提供类似于PostScript和PDF的绘图运算符的操作。cairo中的操作包括：绘制和填充立方体Bézier样条曲线，变换和合成半透明图像，以及抗锯齿文本渲染。所有绘图操作都可以通过任何仿射变换（缩放、旋转、剪切等）进行变换。

作者	Benoît Minisini.
需要	gb.image.

类	说明
Cairo	This class is used for drawing on an Image object or any CairoSurface with the Cairo library.
CairoExtents	This class represents an extents bounding box, as returned by properties like Cairo.ClipExtents or Cairo.FillExtents.
CairoFontExtents	This class stores metric information for a font. Values are given in the current user-space coordinate system.
CairoMatrix	This class represents a Cairo transformation matrix.
CairoPattern	This class represents a Cairo source pattern, as returned by methods like Cairo.SolidPattern or Cairo.LinearGradient.
CairoPdfSurface	This class represents a PDF file.
CairoPsSurface	This class represents a PostScript file.
CairoSurface	This class is the parent class of all Cairo surface classes.
CairoSvgSurface	This class represents a SVG file.
CairoTextExtents	This class stores the extents of a single glyph or a string of glyphs in user-space coordinates.