Questions

Hi there,

Unfotunately column series doesn’t support this behavior out of the box. But you could easily implement it by overriding GetColumnWidth method:

public class ConstantColumnRenderableSeries : FastColumnRenderableSeries
{
    public static readonly DependencyProperty ColumnWidthProperty = DependencyProperty.Register(
        "ColumnWidth", typeof (IComparable), typeof (ConstantColumnRenderableSeries), new PropertyMetadata(default(IComparable), OnInvalidateParentSurface));

    public IComparable ColumnWidth
    {
        get { return (IComparable) GetValue(ColumnWidthProperty); }
        set { SetValue(ColumnWidthProperty, value); }
    }

    protected override double GetColumnWidth(IPointSeries points, IRenderPassData renderPassData)
    {
        ICoordinateCalculator<double> xCoordinateCalculator = renderPassData.XCoordinateCalculator;

        var value = ConvertToDouble(ColumnWidth);

        return xCoordinateCalculator.GetCoordinate(value) - xCoordinateCalculator.GetCoordinate(0);
    }

    private static double ConvertToDouble(IComparable comparable)
    {
        if (comparable == null)
            return 0;

        if (comparable is DateTime)
            return ((DateTime)comparable).Ticks;

        if (comparable is TimeSpan)
            return ((TimeSpan)comparable).Ticks;

        return Convert.ToDouble(comparable, CultureInfo.InvariantCulture);
    }
}

Then you just need to use it instead of FastColumnRenderabeSeries.

Best regards,
Yura.