绘制专题地图的统计专题符号，主要是2.5维符号的绘制，包括饼图、环图、直方图、格网图、柱状图等Draw thematic maps of statistical topics symbols, mainly drawn 2.5D symbols, including pie charts, ring chart, histogram, grid, histogram, etc. (2014-05-15, QT, 14336KB, 下载9次)