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# pieter/gitx

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 // // RoundedRectangle.m // GitX // // Created by Pieter de Bie on 24-09-08. // Copyright 2008 __MyCompanyName__. All rights reserved. // #import "RoundedRectangle.h" @implementation NSBezierPath (RoundedRectangle) + (NSBezierPath *)bezierPathWithRoundedRect: (NSRect) aRect cornerRadius: (double) cRadius { double left = aRect.origin.x, bottom = aRect.origin.y, width = aRect.size.width, height = aRect.size.height; //now, crop the radius so we don't get weird effects double lesserDim = width < height ? width : height; if ( cRadius > lesserDim / 2 ) { cRadius = lesserDim / 2; } //these points describe the rectangle as start and stop points of the //arcs making up its corners --points c, e, & g are implicit endpoints of arcs //and are unnecessary NSPoint a = NSMakePoint( 0, cRadius ), b = NSMakePoint( 0, height - cRadius ), d = NSMakePoint( width - cRadius, height ), f = NSMakePoint( width, cRadius ), h = NSMakePoint( cRadius, 0 ); //these points describe the center points of the corner arcs NSPoint cA = NSMakePoint( cRadius, height - cRadius ), cB = NSMakePoint( width - cRadius, height - cRadius ), cC = NSMakePoint( width - cRadius, cRadius ), cD = NSMakePoint( cRadius, cRadius ); //start NSBezierPath *bp = [NSBezierPath bezierPath]; [bp moveToPoint: a ]; [bp lineToPoint: b ]; [bp appendBezierPathWithArcWithCenter: cA radius: cRadius startAngle:180 endAngle:90 clockwise: YES]; [bp lineToPoint: d ]; [bp appendBezierPathWithArcWithCenter: cB radius: cRadius startAngle:90 endAngle:0 clockwise: YES]; [bp lineToPoint: f ]; [bp appendBezierPathWithArcWithCenter: cC radius: cRadius startAngle:0 endAngle:270 clockwise: YES]; [bp lineToPoint: h ]; [bp appendBezierPathWithArcWithCenter: cD radius: cRadius startAngle:270 endAngle:180 clockwise: YES]; [bp closePath]; //Transform path to rectangle's origin NSAffineTransform *transform = [NSAffineTransform transform]; [transform translateXBy: left yBy: bottom]; [bp transformUsingAffineTransform: transform]; return bp; //it's already been autoreleased } @end
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