我有一个应用程序,其中我从具有透明性的PNG图像创建了多个图层。这些层彼此都在屏幕上。当用户点击图层的非透明区域时,我需要能够忽略对图层的透明区域所进行的触摸,而只能检测为触摸...参见图片...
我怎么做?谢谢。
最佳答案
在这里,您有可能的解决方案。
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);
}
关于cocos2d-iphone - Cocos2d 2.0-忽略对图层/ Sprite 的透明区域的触摸,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/10889170/