NSBezierPath+RoundedRect.m

//	Copyright (c) 2009 Stephen Deken
//	All rights reserved.
// 
//	Redistribution and use in source and binary forms, with or without modification,
//	are permitted provided that the following conditions are met:
//
//	*	Redistributions of source code must retain the above copyright notice, this
//		list of conditions and the following disclaimer.
//	*	Redistributions in binary form must reproduce the above copyright notice,
//		this list of conditions and the following disclaimer in the documentation
//		and/or other materials provided with the distribution.
//	*	Neither the name KeyCastr nor the names of its contributors may be used to
//		endorse or promote products derived from this software without specific
//		prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
//	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
//	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
//	IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
//	INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//	BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
//	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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//	ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


#import "NSBezierPath+RoundedRect.h"


@implementation NSBezierPath (RoundedRect)

-(void) appendRoundedRect:(NSRect)rect radius:(float)r
{
	if (r > rect.size.width/2.0 || r > rect.size.height/2.0)
	{
		r = fmin(rect.size.width,rect.size.height) / 2.0;
	}
	float rr = r * 0.55228475;
	NSRect innerRect = rect;
	innerRect.origin.x += r;
	innerRect.origin.y += r;
	innerRect.size.width -= r*2;
	innerRect.size.height -= r*2;
	[self moveToPoint:NSMakePoint(innerRect.origin.x-r,innerRect.origin.y)];
	[self relativeLineToPoint:NSMakePoint(0,innerRect.size.height)];
	[self relativeCurveToPoint:NSMakePoint(r,r) controlPoint1:NSMakePoint(0,rr) controlPoint2:NSMakePoint(r-rr,r)];
	[self relativeLineToPoint:NSMakePoint(innerRect.size.width,0)];
	[self relativeCurveToPoint:NSMakePoint(r,-r) controlPoint1:NSMakePoint(rr,0) controlPoint2:NSMakePoint(r,rr-r)];
	[self relativeLineToPoint:NSMakePoint(0,-innerRect.size.height)];
	[self relativeCurveToPoint:NSMakePoint(-r,-r) controlPoint1:NSMakePoint(0,-rr) controlPoint2:NSMakePoint(rr-r,-r)];
	[self relativeLineToPoint:NSMakePoint(-innerRect.size.width,0)];
	[self relativeCurveToPoint:NSMakePoint(-r,r) controlPoint1:NSMakePoint(-rr,0) controlPoint2:NSMakePoint(-r,rr)];
}

@end