C / C++ / MFC

GraphicsPath* CGPaintShape::MakeRoundRect(Point topLeft, Point bottomRight, INT percentageRounded)
{
	ASSERT (percentageRounded >= 0 && percentageRounded <= 100);

	// Like they said in the X Files - Trust No One.  Rather than crash and burn,
	// I just pull out the correct edges from the points given, regardless of if they were wrong.

	INT left  = MIN(topLeft.X, bottomRight.X);
	INT right = MAX(topLeft.X, bottomRight.X);

	INT top    = MIN(topLeft.Y, bottomRight.Y);
	INT bottom = MAX(topLeft.Y, bottomRight.Y);

	INT offsetX = (right-left)*percentageRounded/100;  
	INT offsetY = (bottom-top)*percentageRounded/100;

	GraphicsPath * path = new GraphicsPath;

	path->AddArc(right-offsetX, top, offsetX, offsetY, 270, 90);
	
	path->AddArc(right-offsetX, bottom-offsetY, offsetX, offsetY, 0, 90);

	path->AddArc(left, bottom - offsetY, offsetX, offsetY, 90, 90);

	path->AddArc(left, top, offsetX, offsetY, 180, 90);

	path->AddLine(left + offsetX, top, right - offsetX/2, top);

	return path;
}