BNG_Pong_KeyboardInput_collision

// move left
if (Key.isDown(Key.A))		
{
	// if paddle is not touching the side of table
	// we move
	if (paddle1.position.y < fieldHeight * 0.45)
	{
		paddle1DirY = paddleSpeed * 0.5;
	}
	// else we don't move and stretch the paddle
	// to indicate we can't move
	else
	{
		paddle1DirY = 0;
		paddle1.scale.z += (10 - paddle1.scale.z) * 0.2;
	}
}