void SystemDraw::DrawArcOp(const Rect& rc, Point start, Point end, int width, Color color)
{
	if(rc.Width() <= 0 || rc.Height() <= 0)
		return;
	FlushText();
	Sizef radius = Sizef(rc.Size()) / 2.0;
	Pointf center = Pointf(rc.TopLeft()) + radius;
	double ang1 = Bearing((Pointf(start) - center) / radius);
	double ang2 = Bearing((Pointf(end) - center) / radius);
--->	if(ang1 == ang2)
--->		ang1 -= 0.000001;
	
	cairo_move_to(cr, center.x + radius.cx * cos(ang1), center.y + radius.cy * sin(ang1));
	cairo_save(cr);
	cairo_translate(cr, rc.left + radius.cx, rc.top + radius.cy);
	cairo_scale(cr, radius.cx, radius.cy);
	cairo_arc_negative(cr, 0, 0, 1, ang1, ang2);
	cairo_restore(cr);

	SetColor(color);
	sDrawLineStroke(cr, width);
}