Cocos2dx 3. x determines whether the node click area is transparent.

Cocos2dx 3. x determines whether the node click area is transparent.

Sometimes we need to determine whether the area we touch is transparent. In this case, we need to call the glReadPixels function to extract the rgb color value.

Original in vain, mobile games column www.bkjia.com

 

Size size = Director: getInstance ()-> getVisibleSize (); CCRenderTexture * render = RenderTexture: create (size. width, size. height); render-> beginWithClear (,); node-> visit (); // original GLubyte pColor [4]; point location = this-> convertTouchToNodeSpace (touch); glReadPixels (location. x, location. y, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, & pColor [0]); render-> end (); log (r % d g % d B % d a % d, pColor [0], pColor [1], pColor [2], pC Olor [3]); if (! PColor [0] &! PColor [1] &! PColor [2]) {log (tou ming);} else {log (bu tou ming );}