CODEWITHSUNDEEP
javalibgdxbox2d
Tejas Sharma
Tejas Sharma

Reputation: 170

Simple way to move Box2D Body

In plain java, you can just add values to the coordinates like:

object.x += 5;
object.y += 5;
render(object, object.x, object.y);

Is there any way to do this to a Box2D body? Because if I do this:

if(Gdx.input.isKeyPressed(Input.Keys.A) && player.getBody().getLinearVelocity().x >= -2.0f) {
            player.getBody().applyLinearImpulse(new Vector2(-0.12f, 0.0f), player.getBody().getWorldCenter(), true);
        }

then the object keeps going in that direction until I apply a different force. So is there any way to move it a constant amount instead of keep on moving it forever in a constant velocity? I have tried experimenting with friction but it seems like a pain.

Upvotes: 1

Views: 2306

Answers (2)

Tejas Sharma
Tejas Sharma

Reputation: 170

Peter's code also works but I found another way since setTransform may cause potentially unwanted failures:

    float velX = 0, velY = 0;
    if(Gdx.input.isKeyPressed(Input.Keys.W)) {
        velY = 2.0f ;
    } else if(Gdx.input.isKeyPressed(Input.Keys.D)) {
        velX = 2.0f;
    } else if(Gdx.input.isKeyPressed(Input.Keys.S)) {
        velY = -2.0f;
    } else if(Gdx.input.isKeyPressed(Input.Keys.A)) {
         velX = -2.0f;
    }

    player.getBody().setLinearVelocity(velX, velY);

Whenever a key is pressed, the velX or the velY is set and if nothing is pressed, they are set to 0 by default.

Upvotes: 0

Peter R
Peter R

Reputation: 1034

Body has a setTransform(float x, float y, float angle) method.

So, player.getBody().setTransform(-0.12f, 0.0f, angle-here);

Upvotes: 1

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