Question

Hello all I am new in COCOS2DX framework and trying to develop brick breaker game. i am following this demo Brick breker game this tutorial is in cocos2d (iPhone). I code it in cocos2dx and got work correctly. but when i am implementing ccTouchesMoved method. My code compile and run properly but as i touch(click) screen it breck down and give error violation ocures. My code is

void HelloWorld::ccTouchesMoved(CCSet* touches, CCEvent* event)
{
    if (_mouseJoint == NULL) return;

    CCTouch *myTouch = (CCTouch*)touches->anyObject();
    CCPoint location = myTouch->locationInView();
    location = CCDirector::sharedDirector()->convertToGL(location);
    b2Vec2 locationWorld = b2Vec2(location.x/PTM_RATIO, location.y/PTM_RATIO);
    _mouseJoint->SetTarget(locationWorld);
}

How can i resolve this issue. Please guide me.

Answer 1

in the demo that you provided, the following code initialized the mouseJoint

if (_paddleFixture->TestPoint(locationWorld)) {
    b2MouseJointDef md;
    md.bodyA = _groundBody;
    md.bodyB = _paddleBody;
    md.target = locationWorld;
    md.collideConnected = true;
    md.maxForce = 1000.0f * _paddleBody->GetMass();

    _mouseJoint = (b2MouseJoint *)_world->CreateJoint(&md);
    _paddleBody->SetAwake(true);
}

it is in ccTouchesBegan