agg图形引擎。显示效果直逼PHOTOSHOP。并同样具有广泛的功能，并且也能设置像素长宽比等较难问题。含多种例子。-Agg graphics engine. Shows the effect of almost PHOTOSHOP. And equally wide range of functions, and can also set more difficult problems, such as pixel aspect ratio. Containing a variety of e