Velocity doesn't affect body position

[OttoRobba]

Hi folks.

 

I'm creating a simple pong clone and, no matter what I do, the velocity of a body doesn't seem to affect it at all. I based myself on what I saw from the PandaJS fiddles but I just can't get it to work.

 

This is the ball class:

game.module("game.entities.ball").body(function() {    game.createClass("Ball", {      init: function() {        this.sprite = new game.Sprite("ball.png");        this.sprite.addTo(game.scene.stage);        this.sprite.anchor.set(0.5, 0.5);        this.body = new game.Body({          position: {            x: game.system.width / 2,            y: game.system.height / 2          },          velocity: {            x: 10,            y: 0          },          mass: 1        });        this.body.addShape(new game.Rectangle(this.sprite.width, this.sprite.height));        game.scene.world.addBody(this.body);      },      update: function() {        this.sprite.position = this.body.position;      }    });  });

And this is my main scene:

  game.module('game.main').require('game.assets', 'game.entities.ball').body(function() {    game.createScene('Main', {      backgroundColor: 0x000000,      init: function() {        this.world = new game.World();        this.ball = new game.Ball();      }    });  });

The ball is properly displayed but it doesn't move. What am I missing here?

[enpu]

You are missing addObject function.

this.ball = new game.Ball();this.addObject(this.ball);

That will make ball's update function called every frame.

[enpu]

I really should rename that addObject into something more clearer, what you think?

[OttoRobba]

Hmm that does call the update function, thanks Enpu

 

Question: do I need to add:

this.body.position.x += this.body.velocity.x

To the ball update function? That is the only way I can get the body to move. While this is very logical and simple I didn't see this being done in the examples, so that is a bit confusing.

 

As far as the name for the function goes, I'm not sure what would be better.

[enpu]

Ah you got some invalid code in your update function.

Should be:

this.sprite.position.x = this.body.position.x;this.sprite.position.y = this.body.position.y;// ORthis.sprite.position.set(this.body.position.x, this.body.position.y);

[enpu]

this.sprite.position = this.body.position;

This code will actually replace sprites position object with body's position object, and you don't wanna do that.

[OttoRobba]

Aaaah, awesome Enpu, thank you so much