One categorical and one non-categorical X axis on one chart.

[ben.vlayen]

There seems to be a problem when we add a series with a non-categorical x axis and one with a categorical x-axis to one chart.

If we draw the series separately to a chart, they are displayed normally (see attachment; 2 charts on top), however if we want both series on the same chart, the chart acts very strange (see attachment; the bottom chart).

• The points on the categorical axis are not drawn on the label on the x-axis
• The points on the non-categorical axis are not drawn according their x value.

Should we enable some options?

Chart fx wpf version: 8.0.3700.31053

Code snippet:



Private mCategoricalData As ObservableCollection(Of Point)

Private mXYData As ObservableCollection(Of Point)



Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)



'Remove the default series:

mChartControl.Series.Clear() ' the mChartControl is the Chartfx WPF chart



'create the test data:

CreateCategoricalData()

CreateXYData()



'add the first serie on the normal x axis

Dim catSerie = New ChartFX.WPF.SeriesAttributes()

catSerie.Gallery = ChartFX.WPF.Gallery.Line

catSerie.BindingPath = "Y"

catSerie.Content = "Cat"

catSerie.AxisX = mChartControl.AxisX

'We want a categorical axis over here, so bind the labels

catSerie.AxisX.Labels.BindingPath = "X"

catSerie.ItemsSource = mCategoricalData

mChartControl.Series.Add(catSerie)





'Add a serie on the same chart with an other x axis,

'this axis should not be categorical!



'add an non categorical axis

Dim nonCategoricalAxis As New ChartFX.WPF.Axis()

nonCategoricalAxis.ForceZero = False

mChartControl.AxesX.Add(nonCategoricalAxis)



Dim xySerie = New ChartFX.WPF.SeriesAttributes()

xySerie.Gallery = ChartFX.WPF.Gallery.Line

xySerie.BindingPath = "Y"

'We don't want a categorical axis over here, so bind the BindingPathX

xySerie.BindingPathX = "X"

xySerie.Content = "XY"

xySerie.AxisX = nonCategoricalAxis

xySerie.ItemsSource = mXYData

mChartControl.Series.Add(xySerie)



End Sub



Private Sub CreateCategoricalData()

mCategoricalData = New ObservableCollection(Of Point)

mCategoricalData.Add(New Point(0, 1.1))

mCategoricalData.Add(New Point(1, 1.2))

mCategoricalData.Add(New Point(2, 1.3))

mCategoricalData.Add(New Point(0, 1.1))

mCategoricalData.Add(New Point(1, 1.4))

mCategoricalData.Add(New Point(0, 1.3))

End Sub





Private Sub CreateXYData()

mXYData = New ObservableCollection(Of Point)

mXYData.Add(New Point(10, 2.1))

mXYData.Add(New Point(11, 2.2))

mXYData.Add(New Point(12, 2.4))

mXYData.Add(New Point(12.5, 2.2))

mXYData.Add(New Point(13, 2.0))

End Sub



[CarlosAC]

Hi ben.vlayen

Unfortunately, you cannot use categorical and non-categorial axis in the same chart.  This is a limitation of our chart.

Carlos Chaves

[JuanC]

Update: After some consideration and code tweaking we found a relatively safe way to add support for this scenario, to fix the first problem "The points on the categorical axis are not drawn on the label on the x-axis" you can add the following (this should be supported in the current build)

chart1.AxisX.AxisStyle |=

AxisStyles.Categorical;To fix the second problem "The points on the non-categorical axis are not drawn according their x value" you will need a new hotfix that should be available in a couple of days, any build marked 3775 or later should add support for this.

JuanC