2012-01-11 22 views
2

在cocos2d游戏开发中,CGRectContainsPoint方法经常用来检测是否触碰到CCSprite。如何以方便的方式获取精灵矩形?

我用代码fllow得到一个精灵的(这在CCNode)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]; 
    } 


} 

我想知道如果有一种方便的方式获得CCSprite的矩形简单?

+2

你可以通过精灵值为[sprite_nm boundingBox的]。方法。我认为它会对你有用。它返回整个Rect。 – Marine 2012-01-11 05:51:42

回答

2

请使用boundingBox我认为这将是一个很好的选择使用。

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; 
    } 

} 
2

Kobold2D有一个方便的方法containsPoint作为CCNode扩展(的Objective-C类),你可以在你的项目复制:

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

你的代码,然后被简化到这一点,它会与旋转和/工作或缩放的精灵(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"); 
}