/*

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