bouncingball we want to draw the ball as close to the side as possible.

// The following algorithm reduces the distance the ball

// travels until the new coords place it within two units

// of any of the sides-bouncingball we want to draw the ball as close to the side as possible.

　　　　　　　　// The following algorithm reduces the distance the ball

　　　　　　　　// travels until the new coords place it within two units

　　　　　　　　// of any of the sides