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.

ZGRViewer是一种小型，简单的，基于Java的应用程序专门设计，为用户提供一个2.5D的图形可视化工具。-ZGRViewer is a small, simple, Java-based application designed to provide users with a 2.5D graphical visualization tools.