cocos2d sprite collision detection boundingbox

Question

I got 2 sprites. I use the boundingbox to check for collision with CGRectIntersectsRect. But it is not working. HBBall and HBpaddle has a CCSprite called image.

Init:

    ball = [[HBBall alloc] init];
    ball.position = ccp(150, 50);
    [self addChild:ball];
    [update addObject:ball];

    paddle1 = [[HBPaddle alloc] init];
    paddle1.position = ccp(50, 160);
    [self addChild:paddle1];

Update:

if (CGRectIntersectsRect([paddle1.image boundingBox], [ball.image boundingBox])) 
    CCLOG(@"ball hit paddle");

CGRectIntersectsRect retuns always true. Does anyone have an idea?

BQuadra · Accepted Answer · 2011-04-29 19:08:24Z

6

you cant pass directly the bounding box, because it's relative to the sprite. You MUST pass the absolute CGRect boundingbox like this:

s = CCsprite
s.anchorPoint = ccp(0, 0);    
CGRect absoluteBox = CGRectMake(s.position.x, s.position.y, [s boundingBox].size.width, [s boundingBox].size.height);

make necessary adjustments!

hope can help!

answered Apr 29, 2011 at 19:08

BQuadra

8292 gold badges12 silver badges20 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Ted Over a year ago

A small point, but doesn't the s.position.x and s.position.y refer to the center of the sprite? To get the proper rect for the sprite, I think you should use: CGRect absoluteBox = CGRectMake([s boundingBox].origin.x, [s boundingBox].origin.y, [s boundingBox].size.width, [s boundingBox].size.height); HTH

David Neiss · Accepted Answer · 2011-04-28 18:02:38Z

0

http://www.iphonedevsdk.com/forum/iphone-sdk-game-development/17082-cocos2d-collision-detection-between-sprites.html ? Have you googled? This seems like it would be a pretty basic issue in the cocos2d framework.

answered Apr 28, 2011 at 18:02

David Neiss

8,2732 gold badges22 silver badges23 bronze badges

Collectives™ on Stack Overflow

cocos2d sprite collision detection boundingbox

2 Answers 2

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related