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//
// GTMRoundedRectPath.m
//
// Copyright 2010 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.
//
#include "GTMRoundedRectPath.h"
#include <Foundation/Foundation.h>
void GTMCGContextAddRoundRect(CGContextRef context,
CGRect rect,
CGFloat radius) {
if (!CGRectIsEmpty(rect)) {
if (radius > 0.0) {
// Clamp radius to be no larger than half the rect's width or height.
radius = MIN(radius, 0.5f * MIN(rect.size.width, rect.size.height));
CGPoint topLeft = CGPointMake(CGRectGetMinX(rect), CGRectGetMaxY(rect));
CGPoint topRight = CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect));
CGPoint bottomRight = CGPointMake(CGRectGetMaxX(rect),
CGRectGetMinY(rect));
CGContextMoveToPoint(context, CGRectGetMidX(rect), CGRectGetMaxY(rect));
CGContextAddArcToPoint(context, topLeft.x, topLeft.y, rect.origin.x,
rect.origin.y, radius);
CGContextAddArcToPoint(context, rect.origin.x, rect.origin.y,
bottomRight.x, bottomRight.y, radius);
CGContextAddArcToPoint(context, bottomRight.x, bottomRight.y,
topRight.x, topRight.y, radius);
CGContextAddArcToPoint(context, topRight.x, topRight.y,
topLeft.x, topLeft.y, radius);
CGContextAddLineToPoint(context, CGRectGetMidX(rect), CGRectGetMaxY(rect));
} else {
CGContextAddRect(context, rect);
}
}
}
void GTMCGPathAddRoundRect(CGMutablePathRef path,
const CGAffineTransform *m,
CGRect rect,
CGFloat radius) {
if (!CGRectIsEmpty(rect)) {
if (radius > 0.0) {
// Clamp radius to be no larger than half the rect's width or height.
radius = MIN(radius, 0.5f * MIN(rect.size.width, rect.size.height));
CGPoint topLeft = CGPointMake(CGRectGetMinX(rect), CGRectGetMaxY(rect));
CGPoint topRight = CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect));
CGPoint bottomRight = CGPointMake(CGRectGetMaxX(rect),
CGRectGetMinY(rect));
CGPathMoveToPoint(path, m, CGRectGetMidX(rect), CGRectGetMaxY(rect));
CGPathAddArcToPoint(path, m, topLeft.x, topLeft.y,
rect.origin.x, rect.origin.y, radius);
CGPathAddArcToPoint(path, m, rect.origin.x, rect.origin.y,
bottomRight.x, bottomRight.y, radius);
CGPathAddArcToPoint(path, m, bottomRight.x, bottomRight.y,
topRight.x, topRight.y, radius);
CGPathAddArcToPoint(path, m, topRight.x, topRight.y,
topLeft.x, topLeft.y, radius);
CGPathAddLineToPoint(path, m, CGRectGetMidX(rect), CGRectGetMaxY(rect));
} else {
CGPathAddRect(path, m, rect);
}
}
}
CGPathRef GTMCreateRoundedRectPath(CGRect rect, CGFloat radius) {
CGPathRef immutablePath = NULL;
CGMutablePathRef path = CGPathCreateMutable();
if (path) {
GTMCGPathAddRoundRect(path, NULL, rect, radius);
CGPathCloseSubpath(path);
immutablePath = CGPathCreateCopy(path);
CGPathRelease(path);
}
return immutablePath;
}
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