/// <summary>
 /// set opacity/transparency of brush while painting on {@link BrushDrawingView}
 /// </summary>
 /// <param name="opacity">opacity is in form of percentage</param>
 public void SetOpacity(int opacity)
 {
     try
     {
         if (BrushDrawingView != null)
         {
             opacity = (int)(opacity / 100.0 * 255.0);
             BrushDrawingView.SetOpacity(opacity);
         }
     }
     catch (Exception e)
     {
         Methods.DisplayReportResultTrack(e);
     }
 }
 /// <summary>
 /// set opacity/transparency of brush while painting on {@link BrushDrawingView}
 /// </summary>
 /// <param name="opacity">opacity is in form of percentage</param>
 public void SetOpacity(int opacity)
 {
     try
     {
         if (BrushDrawingView != null)
         {
             opacity = (int)(opacity / 100.0 * 255.0);
             BrushDrawingView.SetOpacity(opacity);
         }
     }
     catch (Exception e)
     {
         Console.WriteLine(e);
     }
 }