Cocos2d 2.0 - Ignoring touches to transparent areas of layers/sprites -


i have app have several layers created png images transparency. these layers on screen on each other. need able ignore touches given transparent areas of layers , able detect touches, when user taps on non-transparent area of layer... see pic...

enter image description here

how do that? thanks.

here have possible solution.

implement extension on cclayer , provide method:

- (bool)ispixeltransparentatlocation:(cgpoint)loc  {        //convert location node space     cgpoint location = [self converttonodespace:loc];      //this pixel read , test     uint8 pixel[4];      //prepare render texture draw receiver on, able read required pixel , test         cgsize screensize = [[ccdirector shareddirector] winsize];     ccrendertexture* rendertexture = [[ccrendertexture alloc] initwithwidth:screensize.width                                                                      height:screensize.height                                                                 pixelformat:kcctexture2dpixelformat_rgba8888];      [rendertexture begin];      //draw layer     [self draw];          //read pixel     glreadpixels((glint)location.x,(glint)location.y, khittest_width, khittest_height, gl_rgba, gl_unsigned_byte, pixel);      //cleanup     [rendertexture end];     [rendertexture release];      //test if pixel's alpha byte transparent     return (pixel[3] == 0); }

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