public static void DrawArrow(Graphics g, int x0, int y0, int x1, int y1, double h, double w)
{
Segment3D seg = new Segment3D(x0, y0, 0.0D, x1, y1, 0.0D);
double len = seg.SegLength();
double x = seg.p1.x - seg.p0.x;
double y = seg.p1.y - seg.p0.y;
double angle;
Vector3D p2;
if (len > 0.0D)
{
angle = -System.Math.Atan2(x, y);
p2 = seg.LinearIntarp((len - h) / len);
}
else
{
angle = 0.0D;
p2 = new Vector3D(seg.p0);
p2.y += h;
}
// g.DrawLine((int)(seg.p0.x + 0.5D), (int)(seg.p0.y + 0.5D), (int)(p2.x + 0.5D), (int)(p2.y + 0.5D));
smat.SetSMat(w, h, 0.0D);
rmat.SetRzMat(angle);
tmat.SetTMat(p2.x, p2.y, p2.z);
Matrix44 mat = smat.MultMat(rmat).MultMat(tmat);
Polygon3D arw = triangle.Transform(mat);
// g.DrawPolygon(arw.IxArray(), arw.IyArray(), 3);
}