Is there a way in Box2dWeb to output the position.x object in console.log ()?

Question

I think there is a simple answer to my seemingly simple question, but I can be absolutely wrong. In any case, I'm new to box2dWeb, and in my Box2dWeb world, I create a floor and a simple falling object. When I "debug a draw" on my canvas, I see a box and that's it. All I want to do is infer the x position of the falling object that I created in the console.log browsers, and this does not work perfectly correctly. The .log console simply displays the starting position of my object, but the number is not updated, although my object falls inside the canvas. After hours of searching with many search engines and places like Seth Ladds tutorials, I walked over empty. I hope someone here can help. I have provided some code examples to help me explain a little better. Hope it helps. Thanks to everyone who answers.

  var world;

  function init() {
     var b2Vec2 = Box2D.Common.Math.b2Vec2
      , b2BodyDef = Box2D.Dynamics.b2BodyDef
      , b2Body = Box2D.Dynamics.b2Body
      , b2FixtureDef = Box2D.Dynamics.b2FixtureDef
      , b2Fixture = Box2D.Dynamics.b2Fixture
      , b2World = Box2D.Dynamics.b2World
      , b2MassData = Box2D.Collision.Shapes.b2MassData
      , b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape
      , b2CircleShape = Box2D.Collision.Shapes.b2CircleShape
      , b2DebugDraw = Box2D.Dynamics.b2DebugDraw
        ;

     world = new b2World(
           new b2Vec2(0, 10) //gravity
        , true //allow sleep
     );

     var fixDef = new b2FixtureDef;
     fixDef.density = 1.0;
     fixDef.friction = 0.5;
     fixDef.restitution = 0.2;

     var bodyDef = new b2BodyDef;

     //create ground
     bodyDef.type = b2Body.b2_staticBody;
     bodyDef.position.x = 9;
     bodyDef.position.y = 13;
     fixDef.shape = new b2PolygonShape;
     fixDef.shape.SetAsBox(10, 0.5);
     world.CreateBody(bodyDef).CreateFixture(fixDef);


        //FIXTURE - define fixture
        crateFixture = new b2FixtureDef;


            //set object attributes
            crateFixture.density = 0.9;
            crateFixture.friction = 0.5;
            crateFixture.restitution = 0.5;


        //BODY - define body  
        crateDef = new b2BodyDef;


            //setup type
            crateDef.type = b2Body.b2_dynamicBody;
            crateDef.position.x = 5;        
            crateDef.position.y = 5;    
            crateDef.angle = 65;


        //SHAPE - define shape
        crateFixture.shape = new b2PolygonShape;


        //define shape
            crateFixture.shape.SetAsBox(2, 2);


        //add to our world
        world.CreateBody(crateDef).CreateFixture(crateFixture);


            //setup debug draw
            var debugDraw = new b2DebugDraw();
    debugDraw.SetSprite(document.getElementById("canvas").getContext("2d"));
    debugDraw.SetDrawScale(30.0);
    debugDraw.SetFillAlpha(0.3);
    debugDraw.SetLineThickness(1.0);
    debugDraw.SetFlags(b2DebugDraw.e_shapeBit | b2DebugDraw.e_jointBit);
    world.SetDebugDraw(debugDraw);

     window.setInterval(update, 1000 / 60);
  };

  function update() {
     world.Step(
           1 / 60 //frame-rate
        , 10 //velocity iterations
        , 10 //position iterations
     );
     world.DrawDebugData();
     world.ClearForces();
     console.log('the crate is located at ' + crateDef.position.x); //position of crate doesnt update
  };

Answer 1

, - - Box2DWeb. , . , . :

:

crateFixture = world.CreateBody(crateBodyDef).CreateFixture(crateFixtureDef);

( crateBody) :

console.log('crate X: ' + crateFixture.GetBody().GetPosition().x);
console.log('crate Y: ' + crateFixture.GetBody().GetPosition().y);
console.log('crate Angle: ' + crateFixture.GetBody().GetAngle());

, !

Answer 2

, api/doc Box2dWeb, , ... , crateBody var, , , ... !

:

// Add after world step call
for (b = world.GetBodyList(); b; b = b.GetNext()) {
    console.log('the object is located at (' + b.position.x + ',' + b.position.y + ')');
}

Answer 3

var body = world.CreateBody(bodyDef);
body.CreateFixture(fixDef);

console.log(body.GetWorldCenter().x);

var body = world.CreateBody(bodyDef);
body.CreateFixture(fixDef);

console.log(body.GetPosition().x);

var body = world.CreateBody(bodyDef);
body.CreateFixture(fixDef);

console.log(body.GetWorldPoint(new b2Vec2(0,0)).x);

(0,0) - . GetWorldPoint World Coordinates.

Answer 4

I had a similar problem with Box2dWeb. Thank you for posting this question. Using @JerinChicago's advice, I found a solution.

 for (var b = world.GetBodyList() ; b; b = b.GetNext()) {
     console.log('the object is located at (' + b.GetPosition().x + ',' + b.GetPosition().y + ')');
 }

Hope this helps.