二维图形渲染引擎，可以同时对二维的BITMAP和矢量进行操作（通过一序列的API函数，基于AGG）-Graphin is a 2D graphics rendering library with human readable yet simple external interface (API). It is based on AGG- high fidelity 2D graphics engine and uses libpng/zlib, jpeglib and libtiff(?)