c# - 鼠标拖动三角形逻辑

Question

我正在尝试通过简单的鼠标按下、拖动和鼠标弹起创建一个三角形。我有一个逻辑草图，我用线条画了草图，为了进一步说明和我一直在尝试的一些片段，但是，它从来没有像我试图在我的草图中绘制出来的那样。

有没有我做的不对，是不可能的，除了点击每个顶点还有其他解决方案吗？

private void Form1_MouseDown(object sender, MouseEventArgs e)
    {
     Vertex1 = e.Location; //First (left) Corner
    }

private void Form1_MouseUp(object sender, MouseEventArgs e)
    {
     Vertex2.X = e.X;         //This creates a straight base from Vertex 1 to Vertex 2
     Vertex2.Y = Vertex1.Y    //'''' ''''''' ' '''''''' ''''
     Vertex3.Y = e.Y; //The y is the same height the mouse was let go
     Vertex3.X = (Vertex1.X + Vertex2.X) / 2; //The x is half way from the two corners

     Point[] pts = new Point[3] { Vertex1, Vertex3, Vertex2};
     g.DrawPolygon(Pen1, pts);
     }

Vertex1 是第一个左角(鼠标按下)

顶点2是右角

Vertex3 是顶角

Answer 1

这一行是错误的:

Vertex3.X = (Vertex1.X - Vertex2.X) / 2; //The x is half way from the two corners

应该是

Vertex3.X = Vertex1.X + (Vertex2.X - Vertex1.X) / 2;