CODEWITHSUNDEEP
cocos2d-iphonetouchccsprite
eugene
eugene

Reputation: 41745

detecting touch for a sprite in cocos2d

I subclassed CCSprite to detect a touch to itself.

touchBegan fires upon touch, but log shows that the same sprite is handling touches all the time even though I am touching different sprites every time.
(It's pointer address is same for all touch.)

Further log shows that it's the last sprite I added to the world layer.

Why is the last sprite I added react to touch events all by itself?

I used CCSpriteBatchNode, would this be related to the problem?

Or is it because cocos2d just doesn't perform hit-test to find the correct object to deliver the touch event to?

Upvotes: 0

Views: 4011

Answers (3)

jowie
jowie

Reputation: 8068

Override Touch Delegate:

- (BOOL)ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
    BOOL shouldClaimTouch = NO;

    CGRect myRect = CGRectMake(0, 0, self.contentSize.width, self.contentSize.height);

    CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
    CGPoint absoluteTouch = CGPointMake(fabsf(touchLocation.x), fabsf(touchLocation.y));

    BOOL layerContainsPoint = CGRectContainsPoint(myRect, absoluteTouch);
    if( layerContainsPoint )
    {
        shouldClaimTouch = YES;
        NSLog(@"Sprite was touched!");
        [self fireEvent];
    }

    return shouldClaimTouch;
}

Upvotes: 0

tallen11
tallen11

Reputation: 1377

You need to check if the location of the touch is inside the bounds of your sprite.

Some weird pseudocode 

function touchBegan(UITouch touch, etc)
    CGPoint pos = get location of touch;
    if (CGRectContainsPoint(sprite.boundingBox, pos)) //I think that is the method you need. It's something like that.
        NSLog(@"Sprite was touched!");
        return YES;

Upvotes: 1

eugene
eugene

Reputation: 41745

I've looked at the cocos2d-x source code.

It doesn't hit-test before sending the touch event to touch-delegate.
Hence you have to perform the hit-test yourself in the touchBegan.(At least for the targetedDelegate type)

Upvotes: 1

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