providing a minimal set of C++ classes and methods that can be used in your own sources, to load/save, process and display images. Very portable (Unix/X11,Windows, MacOS X, FreeBSD, .. ), efficient, easy to use,-providing a minimal set of C+

地图可视化，显示中国地图，并可以进行交互性操作，再显示各省人口密度信息-Map visualization, display a map of China, and can undertake interactive operation, and then display the provincial population density