在读入步骤1的饼图后，将在步骤1的图表中绘制由三角形顶点文件指定的多边形。
After reading in the Step 1 pie chart, polygons specified by the triangle vertices file are drawn on the Step 1 chart.
任何多边形都可定义为一组三角形的集合，因此三角形在3d实现中应用十分广泛。
Triangles are popular with 3d implementations because you can define any polygon as a set of triangles.
景物的特征点抽取是模式识别及计算机视觉中的一个重要问题，已出现的多种检测特征点的方法中主要有角检测法和多边形逼近法。
Detecting dominant points is an important subject in pattern recognition and computer vision. Corner detection and polygonal approximation are two major approaches for dominant point detection.
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