请问如何设置精灵（或图层）的某个像素（或区域）的透明度

cocos2d-x JavaScript
#1

如题，想把精灵（或图层）的某一特定区域设置为透明，请问有没有什么相关的方法？
麻烦看一下附件。


mame.bmp.zip (24.3 KB)

#2

PS

#3

:smiley:

In fact, for pixel level control, you can use cc.RenderTexture and use canvas’s pixel control API.
Or we have also cc.ClippingNode, you can check out our test case: ClippingNodeTest -> HoleDemo

Huabin

#4

感谢您的回复，不过我想要的效果还是无法实现，虽然用很多精灵覆盖图片到是可以实现，不过效率太低了，没有其它的办法了吗？

#5

Hi @ying1248

You can use cc.RenderTexture to draw your image. And then with canvas’s getImageData / putImageData function, you can do pixel level modification to your image.
There are docs about canvas’ pixel manipulation like this: https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/HTML-canvas-guide/PixelManipulation/PixelManipulation.html

Huabin