C# GDI+ - Remove just above bottom half of ellipse on gloss method

Question

Hello all, I have a gloss method and I'm trying to get a inverted half moon like effect. On the below code I'd like to remove just above bottom half of this ellipse and then draw it. Does anyone know how I might begin to do that?

PS. The gloss is also turning out too white. I've tried messing with the alpha to no avail, does anyone know any tricks to make the gloss more subtle? Thank you

  /// <summary>
        /// Applies gloss to clock
        /// </summary>
        /// <param name="e"></param>
        private void DrawGloss(PaintEventArgs e)
        {
            Graphics g = e.Graphics;

            float x = ((float)_CenterX / 1.1F) / _PI;
            float y = ((float)_CenterY / 1.2F) / _PI;
            float width = ((this.ClientSize.Width / 2)) + _hourLength;
            float height = ((this.ClientSize.Height / 2)) + _hourLength;

            RectangleF glossRect = new RectangleF(
           x + (float)(width * 0.10),
           y + (float)(height * 0.07),
           (float)(width * .8),
           (float)(height * 0.4));


            LinearGradientBrush gradientBrush =
                new LinearGradientBrush(glossRect,
                Color.FromArgb((int)50, Color.Transparent),
                glossColor,
                LinearGradientMode.BackwardDiagonal);
            g.FillEllipse(gradientBrush, glossRect);


        }

Answer 1

FillPie could give you exactly half a circle. Otherwise you'd have to use FillClosedCurve or FillPath to get slightly less than half a circle, or draw a half-circle onto an intermediate, slightly smaller Bitmap and copy that back onto your main Bitmap with DrawImage.

For a more subtle gloss effect, I think you just need to change your LinearGradientBrush code to:

LinearGradientBrush gradientBrush =                
    new LinearGradientBrush(glossRect,                
    Color.Transparent,                
    Color.FromArgb((int)50, glossColor),                
    LinearGradientMode.BackwardDiagonal);

Your original gradient was going from fully transparent to full glossColor.