box2d not centered in sprite [duplicate]

Question

I am trying to create a bounding box for my sprite using box2d, but the box is being created at the wrong spot. I followed a tutorial on the wiki using this code

    BodyDef bodyDef1 = new BodyDef();
    bodyDef1.type = BodyDef.BodyType.DynamicBody;
    bodyDef1.position.set(player.getX(), player.getY());
    playerBody = world.createBody(bodyDef1);
    PolygonShape square = new PolygonShape();
    square.setAsBox(player.getWidth() / 2, player.getHeight() / 2);
    FixtureDef fixtureDef1 = new FixtureDef();
    fixtureDef1.shape = square;
    fixtureDef1.density = 0.1f;

Player is a just the sprite that I am trying to create the box around.

Answer 1

The position of a Box2D body is defined as its center. So if you set the body's position to the lower left corner of the Sprite, then it will be displayed as you showed in the image.

What you need to do is set the Body's position to the center of the Sprite like so:

bodyDef1.position.set(player.getX() + player.getWidth() / 2, player.getY() + player.getHeight() / 2);