C# 坐标系箭头

GDI+ 中p.EndCap = LineCap.ArrowAnchor;//定义线尾的样式为箭头
箭头画笔宽度够大才能看得清,怎么样才能画出的线细而且箭头足够大?可不可以定义箭头大小?

bitmap bit = new bitmap(picturebox1.width, picturebox1.height);
graphics g = graphics.fromimage(bit);
pen pen = new pen(color.red);
g.drawline(pen, 10, 20, 10, picturebox1.height - 10); // （10，20）y轴的上端的点坐标( 10, picturebox1.height - 10 ) y轴下端点的坐标
// （10, picturebox1.height - 10）x轴的左端的点坐标( picturebox1.width-10 , picturebox1.height - 10 )x轴右端点的坐标
g.drawline(pen, 10, picturebox1.height - 10,picturebox1.width-10 , picturebox1.height - 10);

picturebox1.image=bit;
bit.dispose();
g.dispose();

箭头：
pen 。startcap = system.drawing.drawing2d.linecap.roundanchor
pen 。endcap = system.drawing.drawing2d.linecap.arrowanchor;

System.Drawing.Drawing2D.AdjustableArrowCap lineCap = new System.Drawing.Drawing2D.AdjustableArrowCap(6, 6, true); Pen redArrowPen = new Pen(Color.Red, 4); redArrowPen.CustomEndCap = lineCap; e.Graphics.DrawLine(redArrowPen, 25, 5, 25, 100); 你试试看，是不是要这样的

请使用如下代码： System.Drawing.Drawing2D.AdjustableArrowCap lineCap = new System.Drawing.Drawing2D.AdjustableArrowCap(6, 6, true); Pen redArrowPen = new Pen(Color.Red, 4); redArrowPen.CustomEndCap = lineCap; e.Graphics.DrawLine(redArrowPen, 25, 5, 25, 100);