private void movement() {
		if(_jumpForce > 0)
			_jumpForce -= 0.5f;
		
		if(Keyboard.isKeyDown(Keyboard.KEY_W) && _onGround) {
			jump();
		} else if(Keyboard.isKeyDown(Keyboard.KEY_A)) {
			_velocity.x = -1;
		} else if(Keyboard.isKeyDown(Keyboard.KEY_D)) {
			_velocity.x = 1;
		} else if(Keyboard.isKeyDown(Keyboard.KEY_S)) {
			// TODO: action();
		} else {
			_velocity.x = 0;
		}
	}