我创建了一个自定义的CCSprite，然后添加了一张png图片。

CCTexture2D *paddleTexture = [[CCTextureCache sharedTextureCache] addImage:@"1.png"];

        

MySprite *mSprite = [MySprite paddleWithTexture:paddleTexture];

当手指触摸到这个CCSprite时，我该如何判断当前触摸的位置是否是在图片上的透明区域，还是在图片的图像上。

请高手们帮帮忙，谢谢。

备注：

//判断触摸点是否在CCSprite上

- (BOOL)containsTouchLocation:(UITouch *)touch

{

    CGPoint p = [self convertTouchToNodeSpaceAR:touch];

    CGRect r = [self rectInPixels];

    

    return CGRectContainsPoint(r, p);

}

====解决方案如下================================

CGImageRef inImage;

调用getPixelColorAtLocation方法，传入图片上的一个点，根据返回值判断是否透明区域（如果返回值为0则表示是透明区域）

- (int)getPixelColorAtLocation:(CGPoint)point 

{

    

    CGContextRef cgctx = [self createARGBBitmapContextFromImage];

    if (cgctx == NULL) { return -1; /* error */ }

    

    size_t w = CGImageGetWidth(inImage);

    size_t h = CGImageGetHeight(inImage);

    

    CGRect rect = {

{0,0},{w,h}}; 

    

    CGContextDrawImage(cgctx, rect, inImage); 

    

    unsigned char* data = CGBitmapContextGetData (cgctx);

    

    int alpha;

    if (data != NULL) {

        

        @try {

            int offset = 4*((w*round(point.y))+round(point.x));

            

            alpha =  data[offset]; 

           

        }

        @catch (NSException * e) {

                    }

        @finally {

            

        }

        

    }

    

    

    CGContextRelease(cgctx); 

    

    if (data) { free(data); }

    

    return alpha;

}

- (CGContextRef)createARGBBitmapContextFromImage

{

    

    CGContextRef    context = NULL;

    CGColorSpaceRef colorSpace;

    void *          bitmapData;

    int             bitmapByteCount;

    int             bitmapBytesPerRow;

    

    size_t pixelsWide = CGImageGetWidth(inImage);

    size_t pixelsHigh = CGImageGetHeight(inImage);

    

    bitmapBytesPerRow   = (pixelsWide * 4);

    bitmapByteCount     = (bitmapBytesPerRow * pixelsHigh);

    

    colorSpace = CGColorSpaceCreateDeviceRGB();

    if (colorSpace == NULL)

        return nil;

    

    bitmapData = malloc( bitmapByteCount );

    if (bitmapData == NULL)

    {

        CGColorSpaceRelease( colorSpace );

        return nil;

    }

    

    context = CGBitmapContextCreate (bitmapData,

                                     pixelsWide,

                                     pixelsHigh,

                                     8,

                                     bitmapBytesPerRow,

                                     colorSpace,

                                     kCGImageAlphaPremultipliedFirst|kCGBitmapByteOrder32Big);

    

    if (context == NULL)

    {

        free (bitmapData);

        fprintf (stderr, "Context not created!");

    }

    

    CGColorSpaceRelease( colorSpace );

    

    CGContextSetBlendMode(context, kCGBlendModeCopy);

    

    return context;

}