private static void DrawArrow(Edge e, Pen pen, Graphics graphics, P start, P end)
{
PointF[] points;
float arrowAngle = 30;
P dir = end - start;
P h = dir;
dir /= dir.Length;
P s = new P(-dir.Y, dir.X);
s *= h.Length * ((float)Math.Tan(arrowAngle * 0.5f * (Math.PI / 180.0)));
points = new PointF[] { GleePointToDrawingPoint(start + s), GleePointToDrawingPoint(end), GleePointToDrawingPoint(start - s) };
graphics.FillPolygon(pen.Brush, points);
}
private System.Drawing.Point GleePointToDrawingPoint(Microsoft.Glee.Splines.Point point)
{
return(new System.Drawing.Point((int)point.X, (int)point.Y));
}