iPhone Core Quartz 1- Round Rectangle

 - (void)drawRoundRect : (CGContextRef)context {

	// Drawing with a white stroke color
	CGContextSetRGBStrokeColor(context, 1.0, 1.0, 1.0, 1.0);
	// And draw with a blue fill color
	CGContextSetRGBFillColor(context, 0.0, 0.0, 1.0, 1.0);
	// Draw them with a 2.0 stroke width so they are a bit more visible.
	CGContextSetLineWidth(context, 2.0);
	
	CGRect rrect = CGRectMake(210.0, 90.0, 60.0, 60.0);
	CGFloat radius = 10.0;
	// NOTE: At this point you may want to verify that your radius is no more than half
	// the width and height of your rectangle, as this technique degenerates for those cases.
	
	// In order to draw a rounded rectangle, we will take advantage of the fact that
	// CGContextAddArcToPoint will draw straight lines past the start and end of the arc
	// in order to create the path from the current position and the destination position.
	
	// In order to create the 4 arcs correctly, we need to know the min, mid and max positions
	// on the x and y lengths of the given rectangle.
	CGFloat minx = CGRectGetMinX(rrect), midx = CGRectGetMidX(rrect), maxx = CGRectGetMaxX(rrect);
	CGFloat miny = CGRectGetMinY(rrect), midy = CGRectGetMidY(rrect), maxy = CGRectGetMaxY(rrect);
	
	// Next, we will go around the rectangle in the order given by the figure below.
	//       minx    midx    maxx
	// miny    2       3       4
	// midy    1       9       5
	// maxy   8       7       6
	// Which gives us a coincident start and end point, which is incidental to this technique, but still doesn't
	// form a closed path, so we still need to close the path to connect the ends correctly.
	// Thus we start by moving to point 1, then adding arcs through each pair of points that follows.
	// You could use a similar tecgnique to create any shape with rounded corners.
	
	// Start at 1
	CGContextMoveToPoint(context, minx, midy);
	// Add an arc through 2 to 3
	CGContextAddArcToPoint(context, minx, miny, midx, miny, radius);
	// Add an arc through 4 to 5
	CGContextAddArcToPoint(context, maxx, miny, maxx, midy, radius);
	// Add an arc through 6 to 7
	CGContextAddArcToPoint(context, maxx, maxy, midx, maxy, radius);
	// Add an arc through 8 to 9
	CGContextAddArcToPoint(context, minx, maxy, minx, midy, radius);
	// Close the path
	CGContextClosePath(context);
	// Fill & stroke the path
	CGContextDrawPath(context, kCGPathFillStroke);
}