/core/externals/update-engine/externals/google-toolbox-for-mac/AppKit/GTMNSBezierPath+CGPath.m

 1//
 2//  GTMNSBezierPath+CGPath.m
 3//
 4//  Category for extracting a CGPathRef from a NSBezierPath
 5//
 6//  Copyright 2006-2008 Google Inc.
 7//
 8//  Licensed under the Apache License, Version 2.0 (the "License"); you may not
 9//  use this file except in compliance with the License.  You may obtain a copy
10//  of the License at
11// 
12//  http://www.apache.org/licenses/LICENSE-2.0
13// 
14//  Unless required by applicable law or agreed to in writing, software
15//  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
16//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
17//  License for the specific language governing permissions and limitations under
18//  the License.
19//
20#import "GTMNSBezierPath+CGPath.h"
21#import "GTMDefines.h"
22
23@implementation NSBezierPath (GTMBezierPathCGPathAdditions)
24
25//  Extract a CGPathRef from a NSBezierPath.
26//
27//  Args: 
28//
29//  Returns:
30//    Converted CGPathRef.
31//    nil if failure.
32- (CGPathRef)gtm_CGPath {
33  CGMutablePathRef thePath = CGPathCreateMutable();
34  if (!thePath) return nil;
35  
36  NSInteger elementCount = [self elementCount];
37  
38  // The maximum number of points is 3 for a NSCurveToBezierPathElement.
39  // (controlPoint1, controlPoint2, and endPoint)
40  NSPoint controlPoints[3];
41  
42  for (NSInteger i = 0; i < elementCount; i++) {
43    switch ([self elementAtIndex:i associatedPoints:controlPoints]) {
44      case NSMoveToBezierPathElement:
45        CGPathMoveToPoint(thePath, &CGAffineTransformIdentity, 
46                              controlPoints[0].x, controlPoints[0].y);
47        break;
48      case NSLineToBezierPathElement:
49        CGPathAddLineToPoint(thePath, &CGAffineTransformIdentity, 
50                              controlPoints[0].x, controlPoints[0].y);
51        break;
52      case NSCurveToBezierPathElement:
53        CGPathAddCurveToPoint(thePath, &CGAffineTransformIdentity, 
54                              controlPoints[0].x, controlPoints[0].y,
55                              controlPoints[1].x, controlPoints[1].y,
56                              controlPoints[2].x, controlPoints[2].y);
57        break;
58      case NSClosePathBezierPathElement:
59        CGPathCloseSubpath(thePath);
60        break;
61      default:  // COV_NF_START
62        _GTMDevLog(@"Unknown element at [NSBezierPath (GTMBezierPathCGPathAdditions) cgPath]");
63        break;  // COV_NF_END
64    };
65  }
66  return (CGPathRef)GTMCFAutorelease(thePath);
67}
68
69@end