How do I create and plot a ContourSeries with Oxyplot?

Question

I have a WPF application where I need to visualize y = y(x1, x2) where x1, x2 are linear coordinates. I can do this using the HeatMapSeries in Oxyplot, but when I want to plot two sets of data in the same window, heatmaps are not the proper tool. A couple of contour series would be better. Now, I have tried to achieve this in the same manner as with the HeatMapSeries, that worked pretty well:

public void PlotHeatMap (){

   OxyPlot.PlotModel model = new PlotModel { Title = "2-D data" };
   model.Axes.Add( new OxyPlot.Axes.LinearColorAxis { 
   Position = OxyPlot.Axes.AxisPosition.Right, 
   Palette = OxyPalettes.Jet( 500 ), 
   HighColor = OxyColors.Gray, 
   LowColor = OxyColors.Black } );

   OxyPlot.Series.HeatMapSeries heatmap = new OxyPlot.Series.HeatMapSeries {
     Data = ( Double[ , ] )data,
     X0 = x1min,
     X1 = x1max,
     Y0 = x2min,
     Y1 = x2max
    };

   model.Series.Add( heatmap );
}

Now, when I try to use the ContourSeries instead, I just replace the HeatMapSeries with a ContourSeries:

public void PlotContour (){

   OxyPlot.PlotModel model = new PlotModel { Title = "2-D data" };
   model.Axes.Add( new OxyPlot.Axes.LinearColorAxis { 
   Position = OxyPlot.Axes.AxisPosition.Right, 
   Palette = OxyPalettes.Jet( 500 ), 
   HighColor = OxyColors.Gray, 
   LowColor = OxyColors.Black } );

   OxyPlot.Series.ContourSeries contour = new OxyPlot.Series.ContourSeries {
      ColumnCoordinates = arrayFromMinToMax1,
      RowCoordinates = arrayFromMinToMax2,
      ContourLevels = arrayOfLevels,
      ContourColors = arrayOfColors, // Same # elements as the levels' array
      Data = ( Double[ , ] )data
    };

   model.Series.Add( contour );
}

This just produce the output:

The x- and y-axes are there, and match the min and max coordinates, but I can see no contour lines. I suspect that there is something missing with setting up the Axis (should it be the same as for the HeatMapSeries??). I don't know how to proceed with this contour plot. Are there examples other than e.g. the ContourSeriesExamples at GitHub?

Thanks for any help!

Answer 1

I finally found what was wrong - it was my mistake! The ColumnCoordinates and the RowCoordinates arrays must match the size of the DoubleArray Data! And I didn't make sure they were. Now the contour and heatmap align! Thanks Anders for support and pushing me into my own code!