source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/NaiveColorMap.cs @ 12503

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;
using Microsoft.Research.DynamicDataDisplay.Common.Palettes;
using Microsoft.Research.DynamicDataDisplay.DataSources;

namespace Microsoft.Research.DynamicDataDisplay.Charts
{
  public class NaiveColorMap
  {
    public double[,] Data { get; set; }

    public IPalette Palette { get; set; }

    public BitmapSource BuildImage()
    {
      if (Data == null)
        throw new ArgumentNullException("Data");
      if (Palette == null)
        throw new ArgumentNullException("Palette");


      int width = Data.GetLength(0);
      int height = Data.GetLength(1);

      int[] pixels = new int[width * height];

      var minMax = Data.GetMinMax();
      var min = minMax.Min;
      var rangeDelta = minMax.GetLength();

      int pointer = 0;
      for (int iy = 0; iy < height; iy++)
      {
        for (int ix = 0; ix < width; ix++)
        {
          double value = Data[ix, height - 1 - iy];
          double ratio = (value - min) / rangeDelta;
          Color color = Palette.GetColor(ratio);
          int argb = color.ToArgb();

          pixels[pointer++] = argb;
        }
      }

      WriteableBitmap bitmap = new WriteableBitmap(width, height, 96, 96, PixelFormats.Pbgra32, null);
      int bpp = (bitmap.Format.BitsPerPixel + 7) / 8;
      int stride = bitmap.PixelWidth * bpp;

      bitmap.WritePixels(new Int32Rect(0, 0, width, height), pixels, stride, 0);

      return bitmap;
    }
  }
}