Box2D object speed - cocos2d-iphone

Question

I have a little issue with my game. In my main game scene I create a Player object from a class, like this:
player = [Player spriteWithFile:#"Icon-Small#2x.png"];
player.position = ccp(100.0f, 180.0f);
[player createBox2dObject:world];
Below is the main chunk of my small Player class that creates the body and the fixture so I can use it in a box2d world.
b2BodyDef playerBodyDef;
playerBodyDef.type = b2_dynamicBody;
playerBodyDef.position.Set(self.position.x/PTM_RATIO, self.position.y/PTM_RATIO);
playerBodyDef.userData = self;
playerBodyDef.fixedRotation = true;
playerBodyDef.linearDamping = 4.0;
body = world->CreateBody(&playerBodyDef);
b2CircleShape circleShape;
circleShape.m_radius = 0.7;
b2FixtureDef fixtureDef;
fixtureDef.shape = &circleShape;
fixtureDef.density = 1.0f;
fixtureDef.friction = 1.0f;
fixtureDef.restitution = 1.0f;
body->CreateFixture(&fixtureDef);
The result of this code is a Box2d object with Icon-Small#2x.png over it. When I move a joystick, a Box2D impulse is applied and the player moves. Simple enough, right?
In non-retina displays, this works fine. However, when I switch to Retina in the simulator, Icon-Small#2x.png is created a little higher and farther to the right, not over the Box2D circle. Then, gravity is applied and they both fall down to the platform. Icon-Small#2x.png falls twice as fast. When I move the joystick, the Box2D circle moves, but Icon-Small#2x.png moves twice as fast and the camera follows it, soon leaving the circle off the screen. I doubt this issue has really anything to do with the code I have here, I feel like its a scaling issue hidden somewhere in my game. Does anyone have suggestions?
Edit:
I move the sprite with:
[player moveRight];
This is moveRight in the player class:
-(void) moveRight {
b2Vec2 impulse = b2Vec2(2.0f, 0.0f);
body->ApplyLinearImpulse(impulse, body->GetWorldCenter());
}
Shouldn't be any issue here, right?
Edit (again):
Here's my update: method-
- (void) update:(ccTime)dt {
int32 velocityIterations = 8;
int32 positionIterations = 1;
world->Step(dt, velocityIterations, positionIterations);
for (b2Body* b = world->GetBodyList(); b; b = b->GetNext()) {
if (b->GetUserData() != NULL) {
CCSprite *myActor = (CCSprite*)b->GetUserData();
myActor.position = CGPointMake( b->GetPosition().x *PTM_RATIO,
b->GetPosition().y * PTM_RATIO);
myActor.rotation = -1 * CC_RADIANS_TO_DEGREES(b->GetAngle());
}
}
b2Vec2 pos = [player body]->GetPosition();
CGPoint newPos = ccp(-1 * pos.x * PTM_RATIO + 50, self.position.y * PTM_RATIO);
[self setPosition:newPos];
}
I have a feeling that the issue is somewhere in here. I've tried changing PTM_RATIO around, but it doesn't affect the speed. Any ideas?
Edit: see comment below, almost have this figured out

Answer 1

You problem probably stems from the fact you are using a #2x image... Read, http://www.cocos2d-iphone.org/wiki/doku.php/prog_guide:how_to_develop_retinadisplay_games_in_cocos2d
There it states:
WARNING: It is NOT recommend to use the ”#2x” suffix. Apple treats those images in a special way which might cause bugs in your cocos2d application.
So to solve your problem read through the information on using png files with the -hd suffix.
For the comment:
Do you have some code that looks something like...
world->Step(dt, 10, 10);
for(b2Body *b = world->GetBodyList(); b; b=b->GetNext()) {
if (b->GetUserData() != NULL) {
CCSprite *sprite = (CCSprite *)b->GetUserData();
sprite.position = ccp(b->GetPosition().x * PTM_RATIO,b->GetPosition().y * PTM_RATIO);
}
}
See how the code loops through all the box2d bodies in the word and sets the position of the sprite that is associated with the box2d body?