CODEWITHSUNDEEP
androidandengine
JesusS
JesusS

Reputation: 1665

Moving entity after it leaves the screen

I have an entity moving from right to left, and I want to reuse it, so I want the entity to appear on the right of the screen when it leaves the screen.

    physicsWorld.registerPhysicsConnector(new PhysicsConnector(this, body, true, false)
    {
        @Override
        public void onUpdate(float pSecondsElapsed)
        {
            super.onUpdate(pSecondsElapsed);

            if (GameScene.isRunning)
                body.setLinearVelocity(new Vector2(-100, body.getLinearVelocity().y)); 

            Log.d("TAG","MY X IS: " + getX());
            if (getX() <= -100) {
                Log.d("TAG","I SHOULD RESPAWN");
                setPosition(800, 100);
            }
        }
    });

The log:

02-12 20:14:36.059: D/TAG(9293): MY X IS: 179.99994
02-12 20:14:36.069: D/TAG(9293): MY X IS: 126.6666
02-12 20:14:36.089: D/TAG(9293): MY X IS: 73.33327
02-12 20:14:36.109: D/TAG(9293): MY X IS: 19.999931
02-12 20:14:36.119: D/TAG(9293): MY X IS: -33.333405
02-12 20:14:36.139: D/TAG(9293): MY X IS: -86.66674
02-12 20:14:36.159: D/TAG(9293): MY X IS: -140.00008
02-12 20:14:36.159: D/TAG(9293): I SHOULD RESPAWN
02-12 20:14:36.169: D/TAG(9293): MY X IS: -193.3334
02-12 20:14:36.169: D/TAG(9293): I SHOULD RESPAWN
02-12 20:14:36.189: D/TAG(9293): MY X IS: -246.66675
02-12 20:14:36.189: D/TAG(9293): I SHOULD RESPAWN
02-12 20:14:36.209: D/TAG(9293): MY X IS: -300.0001
02-12 20:14:36.209: D/TAG(9293): I SHOULD RESPAWN

So it is ignoring me :(

Any help with this?

The entity is Kinetic, just in case it helps

Upvotes: 0

Views: 75

Answers (2)

gian1200
gian1200

Reputation: 3864

You can't use methods from sprite when you use a body. Body controls the position of the sprite. Try applying the new position to the body.

Protip: if you face a similar problem in the future (and you are not using physics) you can use MoveModifier and LoopModifier with your sprite.

Upvotes: 1

JesusS
JesusS

Reputation: 1665

Fixed. SetPosition sets the position of the entity, however the body is still controlled by the physics, so you have to use setTransform

@Override
        public void onUpdate(float pSecondsElapsed)
        {
            super.onUpdate(pSecondsElapsed);

            if (GameScene.isRunning)
                body.setLinearVelocity(new Vector2(-8, body.getLinearVelocity().y)); 

            Log.d("TAG","MY X IS: " + getX());
            if (getX() <= -100) {
                Log.d("TAG","I SHOULD RESPAWN");
                final float widthD2 = getWidth() / 2;
                final float heightD2 = getHeight() / 2;
                final float angle = body.getAngle(); // keeps the body angle
                final Vector2 v2 = Vector2Pool.obtain((500 + widthD2) / PIXEL_TO_METER_RATIO_DEFAULT, (50 + heightD2) / PIXEL_TO_METER_RATIO_DEFAULT);
                body.setTransform(v2, angle);
                Vector2Pool.recycle(v2);
                setPosition(500 + widthD2,50+ heightD2);
            }
        }

Upvotes: 0

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