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