NSBezierPath-RoundedRect.m

/*
 
File: NSBezierPath-RoundedRect.m
 
Abstract: Implementation of category adding rounded rect drawing to NSBezierPath
 
Version: 1.0
 
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*/ 
 
#import "NSBezierPath-RoundedRect.h"
 
@implementation NSBezierPath (RoundedRect)
 
+ (NSBezierPath *)bezierPathWithRoundedRect:(NSRect)rect cornerRadius:(float)radius {
    NSBezierPath *result = [NSBezierPath bezierPath];
    [result appendBezierPathWithRoundedRect:rect cornerRadius:radius];
    return result;
}
 
- (void)appendBezierPathWithRoundedRect:(NSRect)rect cornerRadius:(float)radius {
    if (!NSIsEmptyRect(rect)) {
  if (radius > 0.0) {
      // Clamp radius to be no larger than half the rect's width or height.
      float clampedRadius = MIN(radius, 0.5 * MIN(rect.size.width, rect.size.height));
 
      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:clampedRadius];
      [self appendBezierPathWithArcFromPoint:rect.origin toPoint:bottomRight radius:clampedRadius];
      [self appendBezierPathWithArcFromPoint:bottomRight toPoint:topRight    radius:clampedRadius];
      [self appendBezierPathWithArcFromPoint:topRight    toPoint:topLeft     radius:clampedRadius];
      [self closePath];
  } else {
      // When radius == 0.0, this degenerates to the simple case of a plain rectangle.
      [self appendBezierPathWithRect:rect];
  }
    }
}
 
@end