NSBezierPath+StrokeExtensions.m

//
//  NSBezierPath+StrokeExtensions.m
//  By Matt Gemmell <http://iratescotsman.com/> 
//  and Rainer Brockerhoff <http://www.brockerhoff.net/>
//

#import "NSBezierPath+StrokeExtensions.h"

@implementation NSBezierPath (StrokeExtensions)

- (void)strokeInside
{
    /* Stroke within path using no additional clipping rectangle. */
    [self strokeInsideWithinRect:NSZeroRect];
}

- (void)strokeInsideWithinRect:(NSRect)clipRect
{
    NSGraphicsContext *thisContext = [NSGraphicsContext currentContext];
    float lineWidth = [self lineWidth];
    
    /* Save the current graphics context. */
    [thisContext saveGraphicsState];
    
    /* Double the stroke width, since -stroke centers strokes on paths. */
    [self setLineWidth:(lineWidth * 2.0)];
    
    /* Clip drawing to this path; draw nothing outwith the path. */
    [self setClip];
    
    /* Further clip drawing to clipRect, usually the view's frame. */
    if (clipRect.size.width > 0.0 && clipRect.size.height > 0.0) {
        [NSBezierPath clipRect:clipRect];
    }
    
    /* Stroke the path. */
    [self stroke];
    
    /* Restore the previous graphics context. */
    [thisContext restoreGraphicsState];
    [self setLineWidth:lineWidth];
}


@end