工程上常用的等值线的绘制，采用三角网格法绘制，避免了插值带来的模糊效果-Engineering used to draw contours, the use of triangular grid method to draw, to avoid the blurring effect caused by the interpolation

等值线程序 插值做的不好 ，着色什么都完成了 -contour in c#