Terraria.Graphics.Capture.CaptureInterface.Scrolling C# (CSharp) Method

        public void Scrolling()
        {
            int num1 = (Main.mouseState.ScrollWheelValue - Main.oldMouseWheel) / 120 % 30;
            if (num1 < 0)
                num1 += 30;

            int num2 = SelectedMode;
            SelectedMode -= num1;
            while (SelectedMode < 0)
                SelectedMode += 2;
            while (SelectedMode > 2)
                SelectedMode -= 2;
            if (SelectedMode == num2)
                return;

            Main.PlaySound(12, -1, -1, 1);
        }