我在winform上画出来的带箭头直线为什么是这个样子？

p.DashStyle = DashStyle.Solid;                       //定义实线

            p.EndCap = LineCap.ArrowAnchor;                     //定义线尾的样式为箭头

            while (k < N)

            {

                //gg.FillEllipse(myBrush, new Rectangle(point[j].X, point[j].Y, 10, 10));//画实心椭圆

                gg.DrawLine(p, point_edge[j].X, point_edge[j].Y, point_edge[j + 1].X, point_edge[j + 1].Y);

                j+=2;

                k++;

            }

------解决方案--------------------
Graphics
SmoothingMode = SmoothingMode.AntiAlias

Pen
StartCap = LineCap.Round 
EndCap = LineCap.Round
LineJoin = LineJoin.Round

------解决方案--------------------
设置单选按钮相关属性：
Text=""
AutoSize=true