vbAccelerator - Contents of code file: CustomBorderColor.cs

using System;
using System.Drawing;

namespace vbAccelerator.Components.Drawing
{
   /// <summary>
   /// A class for deriving border colours for colours other than
   /// the system control colour using luminance adjustment
   /// techniques.  Requires the vbAccelerator <see cref="HLSRGB"/>
   /// class.
   /// </summary>
   internal class CustomBorderColor
   {
      // For black we can't create a darker colour, and for
      // white we can't create a lighter one.  Therefore we
      // need to play with the colours a little bit to try
      // and achieve an equivalent effect.
      private static Color BlackDarkDark = Color.FromArgb(32,32,32);
      private static Color BlackDark = Color.FromArgb(48,48,48);
      private static Color BlackLight = Color.FromArgb(128,128,128);
      private static Color BlackLightLight = Color.FromArgb(192,192,192);
      private static Color WhiteDarkDark = Color.FromArgb(96,96,96);
      private static Color WhiteDark = Color.FromArgb(160,160,160);
      private static Color WhiteLight = Color.FromArgb(230,230,230);
      private static Color WhiteLightLight = Color.FromArgb(250,250,250);

      /// <summary>
      /// Private constructor - only static methods in this class.
      /// </summary>
      private CustomBorderColor()
      {
         // Intentionally blank
      }

      /// <summary>
      /// Returns the grey intensity of a colour using the ITU
      /// grey-scale standard.
      /// </summary>
      /// <param name="color">The <see cref="System.Drawing.Color"/> to get
      /// the grey scale value for.</param>
      /// <returns>A value between 0 and 255 holding the grey scale amount.
      /// This can be used as the r, g and b arguments to the
      /// <c>Color</c> class to construct the grey scale colour.</returns>
      public static int GreyScale(
         Color color
         )
      {
         return (222 * color.R + 707 * color.G + 71 * color.B) / 1000 ;
      }

      /// <summary>
      /// Draw a border on the specified <see cref="System.Drawing.Graphics"/>
      /// object.
      /// </summary>
      /// <param name="gfx">The <see cref="System.Drawing.Graphics"/> object
      /// to draw onto.</param>
      /// <param name="rect">The <see cref="System.Drawing.Rectangle"/> boundary
      /// for the border.</param>
      /// <param name="color">The <see cref="System.Drawing.Color"/> of the 
      /// object.  This is used to determine the border colours.</param>
      /// <param name="thin">Whether to draw a thin border or not.</param>
      /// <param name="pressed">Whether the border should be drawn pressed
      /// or raised.</param>
      public static void DrawBorder(
         Graphics gfx,
         Rectangle rect,
         Color color,
         bool thin,
         bool pressed
         )
      {
         Pen darkPen = new Pen(CustomBorderColor.ColorDark(color), 1);
         Pen lightLightPen = new Pen(CustomBorderColor.ColorLightLight(color),
          1);
         if (thin)
         {
            if (pressed)
            {
               gfx.DrawLine(darkPen, rect.Left, rect.Bottom - 2, 
                  rect.Left, rect.Top);
               gfx.DrawLine(darkPen, rect.Left, rect.Top, 
                  rect.Right - 2, rect.Top);
               gfx.DrawLine(lightLightPen, rect.Right - 1, rect.Top, 
                  rect.Right - 1, rect.Bottom - 1);
               gfx.DrawLine(lightLightPen, rect.Right - 1, rect.Bottom - 1,
                  rect.Left, rect.Bottom - 1);
            }
            else
            {
               gfx.DrawLine(lightLightPen, rect.Left, rect.Bottom - 2,
                  rect.Left, rect.Top);
               gfx.DrawLine(lightLightPen, rect.Left, rect.Top,
                  rect.Right - 1, rect.Top);
               gfx.DrawLine(darkPen, rect.Right - 1, rect.Top + 1,
                  rect.Right - 1, rect.Bottom - 1);
               gfx.DrawLine(darkPen, rect.Right - 1, rect.Bottom - 1,
                  rect.Left, rect.Bottom - 1);
            }
         }
         else
         {
            Pen lightPen = new Pen(CustomBorderColor.ColorLight(color), 1);
            Pen darkDarkPen = new Pen(CustomBorderColor.ColorDarkDark(color),
             1);
            if (pressed)
            {
               gfx.DrawLine(darkDarkPen, rect.Left, rect.Bottom - 1,
                  rect.Left, rect.Top);
               gfx.DrawLine(darkDarkPen, rect.Left, rect.Top,
                  rect.Right - 1, rect.Top);
               gfx.DrawLine(lightLightPen, rect.Right - 1, rect.Top + 1,
                  rect.Right - 1, rect.Bottom - 1);
               gfx.DrawLine(lightLightPen, rect.Right - 1, rect.Bottom - 1,
                  rect.Left + 1, rect.Bottom - 1);
               gfx.DrawLine(darkPen, rect.Left + 1, rect.Bottom - 2,
                  rect.Left + 1, rect.Top + 1);
               gfx.DrawLine(darkPen, rect.Left + 1, rect.Top + 1,
                  rect.Right - 2, rect.Top + 1);
            }
            else
            {
               gfx.DrawLine(lightLightPen, rect.Left, rect.Bottom - 1,
                  rect.Left, rect.Top);
               gfx.DrawLine(lightLightPen, rect.Left, rect.Top,
                  rect.Right - 1, rect.Top);
               gfx.DrawLine(darkPen, rect.Right - 1, rect.Top + 1,
                  rect.Right - 1, rect.Bottom - 1);
               gfx.DrawLine(darkPen, rect.Right - 1, rect.Bottom - 1,
                  rect.Left + 1, rect.Bottom - 1);
               gfx.DrawLine(lightPen, rect.Left + 1, rect.Bottom - 2,
                  rect.Left + 1, rect.Top + 1);
               gfx.DrawLine(lightPen, rect.Left + 1, rect.Top + 1,
                  rect.Right - 2, rect.Top + 1);
            }
            darkDarkPen.Dispose();
            lightLightPen.Dispose();
         }
         darkPen.Dispose();
         lightLightPen.Dispose();
      }

      /// <summary>
      /// Returns the equivalent of the <see
       cref="System.Drawing.KnownColor.ControlDarkDark"/>
      /// colour for a specified colour.
      /// </summary>
      /// <param name="color">The <see cref="System.Drawing.Color"/> to get the
       darker
      /// shadow shade for.</param>
      /// <returns>The darker shadow <see cref="System.Drawing.Color"/> for the
       specified
      /// colour.</returns>
      public static Color ColorDarkDark(Color color)
      {
         if (color.Equals(Color.FromKnownColor(KnownColor.Control)))
         {
            return Color.FromKnownColor(KnownColor.ControlDarkDark);
         }
         else if (color.Equals(Color.Black))
         {
            return Color.FromArgb(color.A, CustomBorderColor.BlackDarkDark);
         }
         else if (color.Equals(Color.White))
         {
            return Color.FromArgb(color.A, CustomBorderColor.WhiteDarkDark);
         }
         else
         {
            int grey = GreyScale(color);
            HLSRGB hls = new HLSRGB(color.R, color.G, color.B);
            if (grey > 250)
            {
               hls.Luminance = (CustomBorderColor.WhiteDarkDark.R / 255F);
               return Color.FromArgb(color.A, hls.Color);
            }
            else if (grey < 64)
            {
               hls.Luminance = (CustomBorderColor.BlackDarkDark.R / 255F);
               return Color.FromArgb(color.A, hls.Color);
            }
            else
            {
               hls.DarkenColor(0.5F);
               return Color.FromArgb(color.A, hls.Color);
            }
            
         }
      }

      /// <summary>
      /// Returns the equivalent of the <see
       cref="System.Drawing.KnownColor.ControlDark"/>
      /// colour for a specified colour.
      /// </summary>
      /// <param name="color">The <see cref="System.Drawing.Color"/> to get the 
      /// shadow shade for.</param>
      /// <returns>The shadow <see cref="System.Drawing.Color"/> for the
       specified
      /// colour.</returns>
      public static Color ColorDark(Color color)
      {
         if (color.Equals(Color.FromKnownColor(KnownColor.Control)))
         {
            return Color.FromKnownColor(KnownColor.ControlDark);
         }
         else if (color.Equals(Color.Black))
         {
            return Color.FromArgb(color.A, CustomBorderColor.BlackDark);
         }
         else if (color.Equals(Color.White))
         {
            return Color.FromArgb(color.A, CustomBorderColor.WhiteDark);
         }
         else
         {
            int grey = GreyScale(color);
            HLSRGB hls = new HLSRGB(color.R, color.G, color.B);
            if (grey > 250)
            {
               hls.Luminance = (CustomBorderColor.WhiteDark.R / 255F);
               return Color.FromArgb(color.A, hls.Color);
            }
            else if (grey < 64)
            {
               hls.Luminance = (CustomBorderColor.BlackDark.R / 255F);
               return Color.FromArgb(color.A, hls.Color);
            }
            else
            {
               hls.DarkenColor(0.7F);
               return Color.FromArgb(color.A, hls.Color);               
            }
         }
      }

      /// <summary>
      /// Returns the equivalent of the <see
       cref="System.Drawing.KnownColor.ControlLight"/>
      /// colour for a specified colour.
      /// </summary>
      /// <param name="color">The <see cref="System.Drawing.Color"/> to get the
       highlight
      /// shade for.</param>
      /// <returns>The highlight <see cref="System.Drawing.Color"/> for the
       specified
      /// colour.</returns>
      public static Color ColorLight(Color color)
      {
         if (color.Equals(Color.FromKnownColor(KnownColor.Control)))
         {
            return Color.FromKnownColor(KnownColor.ControlLight);
         }
         else if (color.Equals(Color.Black))
         {
            return Color.FromArgb(color.A, CustomBorderColor.BlackLight);
         }
         else if (color.Equals(Color.White))
         {
            return Color.FromArgb(color.A, CustomBorderColor.WhiteLight);
         }
         else
         {
            int grey = GreyScale(color);
            HLSRGB hls = new HLSRGB(color.R, color.G, color.B);
            if (grey > 250)
            {
               hls.Luminance = (CustomBorderColor.WhiteLight.R / 255F);
               return Color.FromArgb(color.A, hls.Color);
            }
            else if (grey < 64)
            {
               hls.Luminance = (CustomBorderColor.BlackLight.R / 255F);
               return Color.FromArgb(color.A, hls.Color);
            }
            else
            {
               hls.LightenColor(0.1F);
               return Color.FromArgb(color.A, hls.Color);
            }
         }
      }

      /// <summary>
      /// Returns the equivalent of the <see
       cref="System.Drawing.KnownColor.ControlLightLight"/>
      /// colour for a specified colour.
      /// </summary>
      /// <param name="color">The <see cref="System.Drawing.Color"/> to get the
       lightest
      /// highlight shade for.</param>
      /// <returns>The lightest highlight <see cref="System.Drawing.Color"/>
       for the specified
      /// colour.</returns>
      public static Color ColorLightLight(Color color)
      {
         if (color.Equals(Color.FromKnownColor(KnownColor.Control)))
         {
            return Color.FromKnownColor(KnownColor.ControlLightLight);
         }
         else if (color.Equals(Color.Black))
         {
            return Color.FromArgb(color.A, CustomBorderColor.BlackLightLight);
         }
         else if (color.Equals(Color.White))
         {
            return Color.FromArgb(color.A, CustomBorderColor.WhiteLightLight);
         }
         else
         {
            int grey = GreyScale(color);
            HLSRGB hls = new HLSRGB(color.R, color.G, color.B);
            if (grey > 250)
            {
               hls.Luminance = (CustomBorderColor.WhiteLightLight.R / 255F);
               return Color.FromArgb(color.A, hls.Color);
            }
            else if (grey < 64)
            {
               hls.Luminance = (CustomBorderColor.BlackLightLight.R / 255F);
               return Color.FromArgb(color.A, hls.Color);
            }
            else
            {
               hls.LightenColor(0.5F);
               return Color.FromArgb(color.A, hls.Color);
            }
         }
      }

   }
}