Moving Physics Body

Box2d physics body can be obtained from PhysicsBody. Then you can use standard box2d methods to set velocity, apply forces, impulses etc. If Entity has VisSprite, it will be automatically updated by VisRuntime, this behavior can be disabled in Scene Config.

Example of moving physics body:

public class PlayerSystem extends BaseSystem implements AfterSceneInit {
		//assigned by artemis
		ComponentMapper<VisSprite> spriteCm;
        ComponentMapper<PhysicsBody> physicsCm;
        VisIDManager idManager;
 
        VisSprite sprite;
        Body body;
       
        @Override
        public void afterSceneInit() {
                Entity player = idManager.get("player");
                sprite = spriteCm.get(player);
                body = physicsCm.get(player).body;
        }
 
        @Override
        protected void processSystem() {
                float x = body.getLinearVelocity().x;
                float y = body.getLinearVelocity().y;
                float desiredVel = 0;
               
                if (Gdx.input.isKeyPressed(Keys.LEFT)) {
                        desiredVel = -20;
                        sprite.setFlip(true, false);
                } else if (Gdx.input.isKeyPressed(Keys.RIGHT)) {
                        desiredVel = 20;
                        sprite.setFlip(false, false);
                }
 
                if (Gdx.input.isKeyJustPressed(Keys.UP)) {
                        float impulse = body.getMass() * 200;
                        body.applyForce(0, impulse, body.getWorldCenter().x, body.getWorldCenter().y, true);
                }
				
                float velChange = desiredVel - x;
                float impulse = body.getMass() * velChange;
                body.applyForce(impulse, 0, body.getWorldCenter().x, body.getWorldCenter().y, true);
        }
}