Pen linePen = new Pen(Color.Red);
linePen.StartCap = LineCap.Round;
linePen.EndCap = LineCap.ArrowAnchor ;
linePen.DashStyle = DashStyle.Solid;
linePen.DashCap = DashCap.Round;
linePen.Width = 1;
Point p1 = new Point(100,100);
Point p2 = new Point(200,300);
Point p3 = new Point(100,400);
PointF[] ps =new PointF[3];
ps[0]=p1;
ps[1]=p2;
ps[2]=p3;
MyGraphics.DrawLines(linePen,ps);画出的结果节点 怎么没有箭头,和圆点