dPompa Blog

Update: CG round rect

In my previous post about round rects in Quartz/CoreGraphics I posted a function I’m constantly using for drawing round rects. Today I found a bug in it. Apparently, all the round rects I drew were placed at 0,0 and so I never stumbled on the bug. Here’s a fixed version of the function:

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void DPContextAddRoundRect(CGContextRef context, CGRect rect, CGFloat cornerRad) {
	// Top Left
	CGContextMoveToPoint(context, rect.origin.x, cornerRad);
	CGContextAddArcToPoint(context,
                               rect.origin.x,
                               rect.origin.y,
                               rect.origin.x + cornerRad,
                               rect.origin.y,
                               cornerRad);
	// Top right
	CGContextAddArcToPoint(context,
                               rect.origin.x + rect.size.width,
                               rect.origin.y,
                               rect.origin.x + rect.size.width,
                               rect.origin.x + cornerRad,
                               cornerRad);
	// Bottom right
	CGContextAddArcToPoint(context,
                               rect.origin.x + rect.size.width,
                               rect.origin.y + rect.size.height,
                               rect.origin.x + rect.size.width - cornerRad,
                               rect.origin.y + rect.size.height,
                               cornerRad);
	// Bottom left
	CGContextAddArcToPoint(context,
                               rect.origin.x,
                               rect.origin.y + rect.size.height,
                               rect.origin.x,
                               rect.origin.y,
                               cornerRad);
	CGContextClosePath(context);
}

Posted Monday, October 5th, 2009 by Ofri Wolfus in Uncategorized | No Comments »