用于2维有限元分析前处理，可以方便的实现三角形网格剖分-This small code is used for triangular mesh generation in the preprocessing phase of finite element analysis.

Using the area of the element to weighted average a value to each point on the triangular mesh

本程序可用作平面杆系结构问题计算，它运用三角形单元来进行分析计算-The procedure used for computing the plane frame structure, which analyzes the use of triangular element to calculate