private void processInput(SendInput sendInput) {
        
        if (sendInput.mousePressed[Input.MOUSE_LEFT_BUTTON]) {
            add(new Wall(sendInput.mousePos.x, sendInput.mousePos.y, 1, 1, this));
        }
        
        User user = sendInput.user;
        Creature player = players.get(user);
        
        float leftPower;
        float rightPower;
        if (sendInput.down[Input.KEY_W]) {
            leftPower = power;
        } else if (sendInput.down[Input.KEY_S]) {
            leftPower = -power;
        } else {
            leftPower = 0;
        }
        
        if (sendInput.down[Input.KEY_R]) {
            rightPower = power;
        } else if (sendInput.down[Input.KEY_F]) {
            rightPower = -power;
        } else {
            rightPower = 0;
        }
        
        player.setMotors(leftPower, rightPower);
        
    }