cocos2d content.size,boundingBox和size

| 我正在编写一个游戏来查找2张图像之间的差异。我创建了CCSprite Spot的子类。首先,我尝试创建小图像并根据其位置添加自身,但后来我发现该位置很难确定,因为很难避免1或2像素的偏移。 然后,我尝试使Spot与图像大小相同,而另一部分透明。但我仍然需要找出手指点击的“热点”。但是当我使用CGRectContainsPoint([self boundingBox],touchLocation)时,它实际上是整个图像。 所以还有其他方法吗?例如content.size或self.size,并从其非透明部分中制作一个CGRect? 谢谢。     
已邀请:
        我现在想通了。这是我的代码:(实际上很简单
-(void) findRect:(NSString*) fn {
//the origin of mTex is top left
//the origin of CGRect is top left, in the coordinate system inside the image
int topLeftX = 0;
int topLeftY = 0;
for (int i = 0; i < image_width; i += 10) {
    for (int j = 0; j < image_height; j += 10) {
        if (([mTex pixelAt:ccp(i, j)].a & 0xFF) != 0) {
            topLeftX = i;
            topLeftY = j;
            goto outer;
        }
    }
}
outer:;
int topRightX = 0;
for (int i = topLeftX; i < image_width; i += 10) {
    if (([mTex pixelAt:ccp(i, topLeftY)].a & 0xFF) == 0) {
        topRightX = i;
        break;
    }
}
if (topRightX == 0) {
    topRightX = image_width - 1;
}

int bottomLeftY = 0;
for (int i = topLeftY; i < image_height; i += 10) {
    if (([mTex pixelAt:ccp(topLeftX, i)].a & 0xFF) == 0) {
        bottomLeftY = i;
        break;
    }
}
if (bottomLeftY == 0) {
    bottomLeftY = image_height - 1;
}
areaRect = CGRectMake(topLeftX, topLeftY, topRightX - topLeftX, bottomLeftY - topLeftY);
}
    
        您将不得不查看纹理数据。本质上,您正在寻找像素完美的碰撞检测算法。有关更多信息,请参见此帖子: http://www.cocos2d-iphone.org/forum/topic/1188     

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