How to get a sprite rect in a convenient way? - objective-c

Question

In cocos2d game development, CGRectContainsPoint method often used to detect if touch on a CCSprite.
I use code fllow to get a sprite's (which in a CCNode) rect property
- (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];
}
}
I want to know if there is a convenient way to get a CCSprite 's rect straightforward?

Answer 1

Please use boundingBox i think it will be a great option to use.
Like this:
- ( 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;
}
}

Answer 2

Kobold2D has a convenience method containsPoint as a CCNode extension (Objective-C category) which you can replicate in your project:
-(BOOL) containsPoint:(CGPoint)point
{
CGRect bbox = CGRectMake(0, 0, contentSize_.width, contentSize_.height);
CGPoint locationInNodeSpace = [self convertToNodeSpace:point];
return CGRectContainsPoint(bbox, locationInNodeSpace);
}
Your code then be simplified to this and it will work with rotated and/or scaled sprites as well (the boundingBox method fails to test rotated and scaled sprites correctly).
if ([firstCard.face containsPoint:location]) {
CCLOG(#"first card touched");
}