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//
// GTMNSBezierPath+RoundRect.h
//
// Category for adding utility functions for creating
// round rectangles.
//
// Copyright 2006-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import "GTMNSBezierPath+RoundRect.h"
@implementation NSBezierPath (GTMBezierPathRoundRectAdditions)
+ (NSBezierPath *)gtm_bezierPathWithRoundRect:(NSRect)rect
cornerRadius:(CGFloat)radius {
NSBezierPath *bezier = [NSBezierPath bezierPath];
[bezier gtm_appendBezierPathWithRoundRect:rect cornerRadius:radius];
return bezier;
}
+ (NSBezierPath *)gtm_bezierPathWithRoundRect:(NSRect)rect
topLeftCornerRadius:(CGFloat)radiusTL
topRightCornerRadius:(CGFloat)radiusTR
bottomLeftCornerRadius:(CGFloat)radiusBL
bottomRightCornerRadius:(CGFloat)radiusBR {
NSBezierPath *bezier = [NSBezierPath bezierPath];
[bezier gtm_appendBezierPathWithRoundRect:rect
topLeftCornerRadius:radiusTL
topRightCornerRadius:radiusTR
bottomLeftCornerRadius:radiusBL
bottomRightCornerRadius:radiusBR];
return bezier;
}
- (void)gtm_appendBezierPathWithRoundRect:(NSRect)rect
cornerRadius:(CGFloat)radius {
if (radius > 0.0) {
// Clamp radius to be no larger than half the rect's width or height.
radius = MIN(radius, 0.5 * MIN(rect.size.width, rect.size.height));
[self gtm_appendBezierPathWithRoundRect:rect
topLeftCornerRadius:radius
topRightCornerRadius:radius
bottomLeftCornerRadius:radius
bottomRightCornerRadius:radius];
} else {
// When radius <= 0.0, use plain rectangle.
[self appendBezierPathWithRect:rect];
}
}
- (void)gtm_appendBezierPathWithRoundRect:(NSRect)rect
topLeftCornerRadius:(CGFloat)radiusTL
topRightCornerRadius:(CGFloat)radiusTR
bottomLeftCornerRadius:(CGFloat)radiusBL
bottomRightCornerRadius:(CGFloat)radiusBR {
// Clamp radii to be at least zero. I'd like to clamp both TL+TR and BL+BR to
// be less than the width and TL+BL and TR+BR to be less than the height, but
// what to do if they're not? Do we scale them both evenly?
radiusTL = MAX(0, radiusTL);
radiusTR = MAX(0, radiusTR);
radiusBL = MAX(0, radiusBL);
radiusBR = MAX(0, radiusBR);
if (!NSIsEmptyRect(rect)) {
NSPoint topLeft = NSMakePoint(NSMinX(rect), NSMaxY(rect));
NSPoint topRight = NSMakePoint(NSMaxX(rect), NSMaxY(rect));
NSPoint bottomRight = NSMakePoint(NSMaxX(rect), NSMinY(rect));
[self moveToPoint:NSMakePoint(NSMidX(rect), NSMaxY(rect))];
[self appendBezierPathWithArcFromPoint:topLeft
toPoint:rect.origin
radius:radiusTL];
[self appendBezierPathWithArcFromPoint:rect.origin
toPoint:bottomRight
radius:radiusBL];
[self appendBezierPathWithArcFromPoint:bottomRight
toPoint:topRight
radius:radiusBR];
[self appendBezierPathWithArcFromPoint:topRight
toPoint:topLeft
radius:radiusTR];
[self closePath];
}
}
@end
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