objective-c – 如何在iOS中切片/切割精灵(核心图形)

目前,我只是缩小尺寸并复制精灵..这样的东西..在此先感谢..

- (BOOL) sliceSprite: (Sprite *) sprite withPath: (UIBezierPath *) slicePath


 {

            CGSize size = sprite.size;
            size.width /= 2; 
            size.height /=2;
            sprite.size = size;
            sprite.sliced = YES;

            Sprite *newSprite = [[Sprite alloc] initWithImage: sprite.image];

            newSprite.position = sprite.position;
            newSprite.size = size;
            newSprite.sliced = YES;
            newSprite.inView = YES;
            newSprite.xVeLocity = SLICE_SPEEDUP * sprite.yVeLocity;
            newSprite.yVeLocity = SLICE_SPEEDUP * sprite.xVeLocity;
            newSprite.angularVeLocity = -SLICE_REVUP * sprite.angularVeLocity;

            [sprites addObject: newSprite];
            [newSprite release];

        sprite.angularVeLocity = SLICE_REVUP * sprite.angularVeLocity;
            sprite.xVeLocity = -SLICE_SPEEDUP * sprite.xVeLocity;
            sprite.yVeLocity = -SLICE_SPEEDUP * sprite.yVeLocity;

            return YES;
    }

- (void) sliceSpritesInSwipePath
{
    CGRect swipeRect = [swipePath bounds];


        for (NSUInteger i = 0; i < [sprites count]; i++)
        {
                Sprite *sprite = [sprites objectATindex: i];

                if ([spritE intersectsWithPathInArray: swipePoints
                                               inRect: swipeRect])
                        if ([self sliceSprite: sprite withPath: swipePath])
                        {

                                [self resetSwipe];

                                if (![sliceSound isPlaying])
                                        [sliceSound play];

                break;
                        }
        }

}