//构造函数用于给以上声明的两个列表初始化
public Construction_TIN(PointList points)
{
this.pointlist = points;
this.triangles = new TriangleList();
}
private void button1_Click(object sender, EventArgs e)
{
points = new PointList();
triangles = null;
this.panel.BackgroundImage = null;
}
