StationaryGunSystem process

protected void process(Entity e) {
        // TODO if baseBody was destroyed then disable rotation
        StationaryGunComponent gunComponent = components.get(e);
        Box2dBodyComponent bodyComponent = Box2dBodySystem.components.get(e);

        float expectedWorldAngle = gunComponent.getExpectedWorldAngleRads();
        float currWorldAngle = bodyComponent.body.getAngle();
        float angleDelta = MathUtilsExt.diffAbsoluteRadians(currWorldAngle, expectedWorldAngle);

        float absDelta = Math.abs(angleDelta);
        float angleStep;
        if (absDelta > ROTATE_STEP) {
            angleStep = angleDelta / absDelta * ROTATE_STEP;
        } else {
            angleStep = angleDelta;
        }

        float rotationBalance = gunComponent.getRotationBalance();
        float newRotationBalance = rotationBalance + angleStep;
        if (newRotationBalance < 0 || newRotationBalance > gunComponent.getRangeRadians()) {
            // TODO rotate to bound
            return;
        }

        gunComponent.setRotationBalance(newRotationBalance);
        Vector2 position = bodyComponent.body.getPosition();
        bodyComponent.body.setTransform(position.x, position.y, currWorldAngle + angleStep);

    }