source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Common/Auxiliary/BrushHelper.cs @ 13749

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Media;

namespace Microsoft.Research.DynamicDataDisplay
{
  public static class BrushHelper
  {
    /// <summary>
    /// Creates a SolidColorBrush with random hue of its color.
    /// </summary>
    /// <returns>A SolicColorBrush with random hue of its color.</returns>
    public static SolidColorBrush CreateBrushWithRandomHue()
    {
      return new SolidColorBrush { Color = ColorHelper.CreateColorWithRandomHue() };
    }

    /// <summary>
    /// Makes SolidColorBrush transparent.
    /// </summary>
    /// <param name="brush">The brush.</param>
    /// <param name="alpha">The alpha, [0..255]</param>
    /// <returns></returns>
    public static SolidColorBrush MakeTransparent(this SolidColorBrush brush, int alpha)
    {
      Color color = brush.Color;
      color.A = (byte)alpha;

      return new SolidColorBrush(color);
    }

    /// <summary>
    /// Makes SolidColorBrush transparent.
    /// </summary>
    /// <param name="brush">The brush.</param>
    /// <param name="alpha">The alpha, [0.0 .. 1.0].</param>
    /// <returns></returns>
    public static SolidColorBrush MakeTransparent(this SolidColorBrush brush, double opacity)
    {
      return MakeTransparent(brush, (int)(opacity * 255));
    }

    public static SolidColorBrush ChangeLightness(this SolidColorBrush brush, double lightnessFactor)
    {
      Color color = brush.Color;
      HsbColor hsbColor = HsbColor.FromArgbColor(color);
      hsbColor.Brightness *= lightnessFactor;

      if (hsbColor.Brightness > 1.0) hsbColor.Brightness = 1.0;

      SolidColorBrush result = new SolidColorBrush(hsbColor.ToArgbColor());
      return result;
    }

    public static SolidColorBrush ChangeSaturation(this SolidColorBrush brush, double saturationFactor)
    {
      Color color = brush.Color;
      HsbColor hsbColor = HsbColor.FromArgbColor(color);
      hsbColor.Saturation *= saturationFactor;

      if (hsbColor.Saturation > 1.0) hsbColor.Saturation = 1.0;

      SolidColorBrush result = new SolidColorBrush(hsbColor.ToArgbColor());
      return result;
    }
  }
}