cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   kenny
   Member

   Hi,

   cocos2d version 0.8.1:

   I have an AtlasSprite and I am using box2d. When ccTouchesEnded gets executed, I call setPosition below on the actor:

   - (void)setPosition:(CGPoint)aPosition {
   actorAtlasSprite.position = CGPointMake( aPosition.x, aPosition.y);
   actorAtlasSprite.rotation = -1 * CC_RADIANS_TO_DEGREES(body->GetAngle());
   body->SetTransform( b2Vec2(aPosition.x/32, aPosition.y/32), body->GetAngle());
   }

   I have DrawDebugData on. I see the body moving (gravity causing it to fall), but the AtlasSprite moves to the position but DOES NOT fall with the body.

   Please point me in the right direction.

   Thanks Again,

   Kenny

   Posted 2 years ago #
2. 

   patrickC
   Member

   Are you updating the position of the AtlasSprite on every draw frame?
   Something like:
   

   jointSprite.position = CGPointMake( jointBody->GetPosition().x * PTM_RATIO, jointBody->GetPosition().y * PTM_RATIO);
   jointSprite.rotation = -1 * CC_RADIANS_TO_DEGREES(jointBody->GetAngle());

   cheers

   Posted 2 years ago #
3. 

   badawe
   Member

   You change the position of your atlas, you just need update the position of the body, and the timestep of your world dot he rest for you!

   - (void)setPosition:(CGPoint)aPosition {
   body->SetTransform( b2Vec2(aPosition.x/32, aPosition.y/32), body->GetAngle());
   }

   Posted 2 years ago #
4. 

   kenny
   Member

   Hi badawe and patrickC,

   Thank You both!! Did not set the position of sprite in the loop (step of the world). :-(

   Thanks Again,

   Kenny

   Posted 2 years ago #

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