public void dbugLine(double x1, double y1, double x2, double y2, ColorRGBA color)
{
VertexStore vxs = new VertexStore(8);
vxs.AddMoveTo(x1, y1);
vxs.AddLineTo(x2, y2);
vxs.AddStop();
Render(new Stroke(1).MakeVxs(vxs), color);
}