Change the direction of a Pen's arrow end cap

Question

I want to draw a line and show the arrow cap at the 'tail' of the line, like this:

Here is what I tried. The arrow cap is placed at the line's end, but its direction is not correct. It's coming downwards while I want it upwards like in the above image.

AdjustableArrowCap bigArrow = new AdjustableArrowCap(5, 5);
Pen p = new Pen(Color.Black, 2);
p.CustomEndCap = bigArrow;
g.DrawLine(p, X, Y, X, 50);

Answer 1

This is a workaround, using a one-pixel extra line, but I think will do the job:

var img = new System.Drawing.Bitmap(200, 200); 
using (var g = System.Drawing.Graphics.FromImage(img)) {
   using (var p1 = new System.Drawing.Pen(System.Drawing.Color.Black, 2),
              p2 = new System.Drawing.Pen(System.Drawing.Color.Black, 2)) {
       using (var bigArrow = new AdjustableArrowCap(5, 5)) {
           p2.CustomEndCap = bigArrow;
           g.DrawLine(p1, 25, 50, 25, 100);
           g.DrawLine(p2, 25, 100, 25, 99);
        }
    }
}

Here is my output:

Answer 2

This one uses CustomLineCap , it's not perfect but hopefully will give you a good direction

Graphics g= e.Graphics;
using (var path = new GraphicsPath()) {
    path.AddLine(new Point(-4, 4), new Point(4, 4));
    path.AddLine(new Point(4, 4), new Point(0, -1));
    path.AddLine(new Point(0, -1), new Point(-4, 4));
    using (var cap = new CustomLineCap(path, null))
    using (var customCapPen = new Pen(Color.Black, 2) {CustomEndCap = cap}) { g.DrawLine(customCapPen, 10, 10, 10, 50); }
}