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Formatting a black and white pie chart
https://forum.pdfsharp.net/viewtopic.php?f=2&t=2359		 Page 1 of 1
Author:  Kevin [ Mon Mar 11, 2013 3:27 pm ]
Post subject:  Formatting a black and white pie chart
Using MigraDoc, I need to add pie charts to a PDF that is required to use only grayscale colors. I have a couple questions about formatting them:

1) How do I change the colors that the chart uses for its slices? Again, I can only use shades of gray, so the current colors don't work for me, but I don't want all of the slices to be the same color either.

2) Is there some way to put the X-series labels next to or on the pie chart slices instead of in a legend? Since all of my slices will be gray, a legend that identifies each of the slices by color won't be very useful.

I attached an image of roughly what I want to do in MigraDoc.

Attachments:
black and white pie chart.png
black and white pie chart.png [ 4.97 KiB | Viewed 5924 times ]
Author:  Noconi [ Wed Nov 20, 2013 8:12 pm ]
Post subject:  Re: Formatting a black and white pie chart
I was just trying to control the color output of the pie wedges and could find how. Eventually I went to the PDFSharp source code and found PdfSharp.Charting.Renderers.Colors.cs. In there was an array of colors under shown below. I changed the hex strings to the colors (Green,Red,Blue...) I wanted and re-compiled the dll's. Not a perfect solution, but it worked for me.

Code:
internal sealed class PieColors
  {
    /// <summary>
    /// Gets the color for pie charts from the specified index.
    /// </summary>
    public static XColor Item(int index)
    {
      return XColor.FromArgb((int)sectorColors[index]);
    }

    /// <summary>
    /// Colors for pie charts taken from Excel.
    /// </summary>
    static uint[] sectorColors = new uint[]
    {
      0xFF00FF00, 0xFFFF0000, 0xFF0000FF, 0xFFCCFFFF, 0xFF660066, 0xFFFF8080,
      0xFF0066CC, 0xFFCCCCFF, 0xFF000080, 0xFFFF00FF, 0xFFFFFF00, 0xFF00FFFF,
      0xFF800080, 0xFF800000, 0xFF008080, 0xFF0000FF, 0xFF00CCFF, 0xFFCCFFFF,
      0xFFCCFFCC, 0xFFFFFF99, 0xFF99CCFF, 0xFFFF99CC, 0xFFCC99FF, 0xFFFFCC99,
      0xFF3366FF, 0xFF33CCCC, 0xFF99CC00, 0xFFFFCC00, 0xFFFF9900, 0xFFFF6600,
      0xFF666699, 0xFF969696, 0xFF003366, 0xFF339966, 0xFF003300, 0xFF333300,
      0xFF993300, 0xFF993366, 0xFF333399, 0xFF333333, 0xFF000000, 0xFFFFFFFF,
      0xFFFF0000, 0xFF00FF00, 0xFF0000FF, 0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF,
      0xFF800000, 0xFF008000, 0xFF000080, 0xFF808000, 0xFF800080, 0xFF008080,
      0xFFC0C0C0, 0xFF808080
    };
  }
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