我画一条线
Graphics gg = this.CreateGraphics();
Pen pen = new Pen(Color.Blue, 2);
gg.DrawLine(pen, Lines[0].StartPoint.X, Lines[0].StartPoint.Y,
Lines[0].EndPoint.X, Lines[0].EndPoint.Y);
我怎样才能把这条线分成两部分......当我用鼠标右键单击并从 contextMenuStrip 中选择 split 时,这条线分成三部分
gg.DrawLine(pen, Lines[0].StartPoint.X, Lines[0].StartPoint.Y,
mouseposition.X, mouseposition.Y);
gg.DrawLine(pen, mouseposition.X, mouseposition.Y,
Lines[0].EndPoint.X, Lines[0].EndPoint.Y);