我有一个应用程序,我有几个图层从透明度的PNG图像创建.这些层都在屏幕上彼此相交.我需要能够忽略给层的透明区域的触摸,并且当用户点击层的不透明区域时,就能够被触摸检测到…请参见图片…
我怎么做？谢谢.
这里有一个可能的解决方案.
原文链接：https://www.f2er.com/cocos2dx/338142.html在CCLayer上实现扩展,并提供以下方法：
- (BOOL)isPixelTransparentAtLocation:(CGPoint)loc
{
//Convert the location to the node space
CGPoint location = [self convertToNodeSpace:loc];
//This is the pixel we will read and test
UInt8 pixel[4];
//Prepare a render texture to draw the receiver on,so you are able to read the required pixel and test it
CGSize screenSize = [[CCDirector sharedDirector] winSize];
CCRenderTexture* renderTexture = [[CCRenderTexture alloc] initWithWidth:screenSize.width
height:screenSize.height
pixelFormat:kCCTexture2DPixelFormat_RGBA8888];
[renderTexture begin];
//Draw the layer
[self draw];
//Read the 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 the pixel's alpha byte is transparent
return (pixel[3] == 0);
}
