通过一系列的坐标点生成TIN三角网，将各个三角形的顶点存储到Text文本中-Through a series of coordinates of points to generate TIN TIN, the apex of each triangle to Text text storage

基于三角网等值线绘制,带填充并能够生成svg-Based on the triangle contour drawing, band-filling and be able to generate svg