Cocos2d检测形状内的CCSprite位置

Question

我新使用Cocos2d。我在图片链接中有问题显示（抱歉，我可以直接上传图片）。我如何检查黑色区域内的红色精灵位置？ http://postimg.org/image/86f6ol2mh/

Answer 1

你可以使用LearnCocos2D sugestion，或者如果你不需要这个形状，也许你可以从图像中心获得半径。

- (BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];
    location = [self convertToNodeSpace:location];

    float dist = pow(YOURSPRITE.position.x - location.x, 2) + pow(YOURSPRITE.position.y - location.y, 2);
    dist = sqrt(dist);

    if (dist <= 70) { //use some value for radius (70)

    }
}