cocos2D and Box2D : How to get exact touched sprite? - iphone

Question

I am trying to move sprite on touch moved. but when two sprites is there i am geting touch of two sprites. that's why sprites are not moving properly.
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
{
if (_mouseJoint != NULL) return;
UITouch *myTouch = [touches anyObject];
CGPoint location = [myTouch locationInView:[myTouch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
b2Vec2 locationWorld = b2Vec2(location.x/PTM_RATIO, location.y/PTM_RATIO);
for(int i=0;i<[mutArrFixtures count];i++)
{
b2Fixture *fixture;
[[mutArrFixtures objectAtIndex:i] getValue:&fixture];
if (fixture->TestPoint(locationWorld)){
for(int j=0; j<[mutArrPaddleBody count]; j++)
{
b2Body *body;
[[mutArrPaddleBody objectAtIndex:j] getValue:&body];
b2MouseJointDef md;
if(body == fixture->GetBody())
{
md.bodyA = _groundBody;
md.bodyB = body;
md.target = locationWorld;
md.collideConnected = true;
md.maxForce = 1000.0f * body->GetMass();
_mouseJoint = (b2MouseJoint *)_world->CreateJoint(&md);
body->SetAwake(true);
}
}
}
}
}
i have an array of b2Fixture mutArrFixtures and also an array mutArrPaddleBody of b2body. but in this if i touch on second sprite i get touch on first sprite and second sprite.. two sprites positions are same...

Answer 1

In touch function, check tag of the sprite. If that is ur right sprite then move. Show me some code that u used for touch movement.
.......
Replace these code with next one
b2Body *body;
[[mutArrPaddleBody objectAtIndex:j] getValue:&body];
b2MouseJointDef md;
if(body == fixture->GetBody())
with
b2Body* body = fixture->GetBody();
CCSprite *sprite = (CCSprite*)body->GetUserData();
if( sprite && sprite.tag == kTagHero)
{
}
Make sure u added tag kTagHero for ur moving sprite.
....
enum gameTag {
kTagHero = 1001
};
and assign sprite.tag = kTagHero
......