Question

在cocos2d游戏开发中， CGRectContainsPoint 方法通常用于检测是否触摸CCSprite。

我使用代码fllow来获取sprite（在CCNode中）rect属性

- (void)ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event {
    CCLOG(@"ccTouchEnded");
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];
    CCLOG(@"location.x:%f, y:%f", location.x, location.y);
    CGRect rect;

    rect = CGRectMake(self.firstCard.face.position.x-(self.firstCard.face.contentSize.width/2), self.firstCard.face.position.y-(self.firstCard.face.contentSize.height/2),
                      self.firstCard.face.contentSize.width, self.firstCard.face.contentSize.height);
    if (CGRectContainsPoint(rect, location)) {
        CCLOG(@"first card touched");
        [firstCard open];
    }

    rect = CGRectMake(self.secondCard.face.position.x-(self.secondCard.face.contentSize.width/2), self.secondCard.face.position.y-(self.secondCard.face.contentSize.height/2),
                      self.secondCard.face.contentSize.width, self.secondCard.face.contentSize.height);
    if (CGRectContainsPoint(rect, location)) {
        CCLOG(@"second card touched");
        [secondCard open];
    }


}

我想知道是否有一种方便的方法让CCSprite的直接直截了当？

Answer 1

Kobold2D有一个便捷方法containsPoint作为CCNode扩展（Objective-C类别），您可以在项目中复制它：

-(BOOL) containsPoint:(CGPoint)point
{
    CGRect bbox = CGRectMake(0, 0, contentSize_.width, contentSize_.height);
    CGPoint locationInNodeSpace = [self convertToNodeSpace:point];
    return CGRectContainsPoint(bbox, locationInNodeSpace);
}

然后你的代码被简化为这个，它也适用于旋转和/或缩放的精灵（boundingBox方法无法正确测试旋转和缩放的精灵）。

if ([firstCard.face containsPoint:location]) {
        CCLOG(@"first card touched");
}

Answer 2

请使用boundingBox我认为这将是一个很好的选择。

像这样：

- ( void ) ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
   locationTouchBegan = [touch locationInView: [touch view]];

    //location is The Point Where The User Touched

    locationTouchBegan = [[CCDirector sharedDirector] convertToGL:locationTouchBegan];

    //Detect the Touch On sprite

    if(CGRectContainsPoint([sprite boundingBox], locationTouchBegan))
    {
        isSpriteTouched=YES;
    } 

}

如何以方便的方式获得精灵矩形？

2 个答案: