//
//  RoundedRectangle.m
//  Reflection
//
//  Created by Jon Drummond on 3/31/07.
//  Copyright 2007 __MyCompanyName__. All rights reserved.
//

#import "RoundedBezierPath.h"


@implementation NSBezierPath(RoundedRectangle)

+ (NSBezierPath*)bezierPathWithRoundRectInRect:(NSRect)aRect radius:(float)radius
{
   NSBezierPath* path = [self bezierPath];
   radius = MIN(radius, 0.5f * MIN(NSWidth(aRect), NSHeight(aRect)));
   NSRect rect = NSInsetRect(aRect, radius, radius);
   [path appendBezierPathWithArcWithCenter:NSMakePoint(NSMinX(rect), NSMinY(rect)) radius:radius startAngle:180.0 endAngle:270.0];
   [path appendBezierPathWithArcWithCenter:NSMakePoint(NSMaxX(rect), NSMinY(rect)) radius:radius startAngle:270.0 endAngle:360.0];
   [path appendBezierPathWithArcWithCenter:NSMakePoint(NSMaxX(rect), NSMaxY(rect)) radius:radius startAngle:  0.0 endAngle: 90.0];
   [path appendBezierPathWithArcWithCenter:NSMakePoint(NSMinX(rect), NSMaxY(rect)) radius:radius startAngle: 90.0 endAngle:180.0];
   [path closePath];
   return path;
}

+ (NSBezierPath *) bezierPathWithRoundedRect: (NSRect) aRect cornerRadius: (double) cRadius
{
	double left = aRect.origin.x, bottom = aRect.origin.y, width = aRect.size.width, height = aRect.size.height;
	
	//now, crop the radius so we don't get weird effects
	double lesserDim = width < height ? width : height;
	if ( cRadius > lesserDim / 2 )
	{
		cRadius = lesserDim / 2;
	}

	//these points describe the rectangle as start and stop points of the
	//arcs making up its corners --points c, e, & g are implicit endpoints of arcs
	//and are unnecessary
	NSPoint a = NSMakePoint( 0, cRadius ), b = NSMakePoint( 0, height - cRadius ),
		d = NSMakePoint( width - cRadius, height ), f = NSMakePoint( width, cRadius ),
		h = NSMakePoint( cRadius, 0 );

	//these points describe the center points of the corner arcs
	NSPoint cA = NSMakePoint( cRadius, height - cRadius ),
		cB = NSMakePoint( width - cRadius, height - cRadius ),
		cC = NSMakePoint( width - cRadius, cRadius ),
		cD = NSMakePoint( cRadius, cRadius );
			
	//start
	NSBezierPath *bp = [NSBezierPath bezierPath];
	[bp moveToPoint: a ];
	[bp lineToPoint: b ];
	[bp appendBezierPathWithArcWithCenter: cA radius: cRadius startAngle:180 endAngle:90 clockwise: YES];
	[bp lineToPoint: d ];
	[bp appendBezierPathWithArcWithCenter: cB radius: cRadius startAngle:90 endAngle:0 clockwise: YES];
	[bp lineToPoint: f ];
	[bp appendBezierPathWithArcWithCenter: cC radius: cRadius startAngle:0 endAngle:270 clockwise: YES];
	[bp lineToPoint: h ];
	[bp appendBezierPathWithArcWithCenter: cD radius: cRadius startAngle:270 endAngle:180 clockwise: YES];	
	[bp closePath];

	//Transform path to rectangle's origin
	NSAffineTransform *transform = [NSAffineTransform transform];
	[transform translateXBy: left yBy: bottom];
	[bp transformUsingAffineTransform: transform];

	return bp; //it's already been autoreleased
}

@end