Stacked Bar Chart where X axis labels/range is different between series

Hi Bill,

You should be able to do this if you explicitly define the axis in your XAML.  Then you have control over the major/minor ticks and how far apart they are.  For instance, this XAML seemed to work when I tried it on a couple series that had Tuple<int,int> data:

<charts:XYChart>
	<charts:XYChart.XAxes>
		<charts:XYDoubleAxis TickMajorInterval="5" TickMinorInterval="1" />
	</charts:XYChart.XAxes>
	<charts:XYChart.YAxes>
		<charts:XYDoubleAxis Minimum="0" Maximum="6" TickMajorInterval="2" TickMinorInterval="1" />
	</charts:XYChart.YAxes>
	<charts:BarSeries StackKind="Normal" ItemsSource="{Binding ElementName=window, Path=Data1}" XPath="Item1" YPath="Item2" />
	<charts:BarSeries StackKind="Normal" ItemsSource="{Binding ElementName=window, Path=Data2}" XPath="Item1" YPath="Item2" />
</charts:XYChart>

Hey,

I don't think this will work for a grouped type axis, which is what I am using.  My X axis consists of string labels that are defined using a label function.  The Bar Series elements are created programmatically.

 <charts:XYChart.YAxes>
    <charts:XYDoubleAxis x:Name="YAxisNormal" LabelFormat="{}{1:0}" Style="{StaticResource AxisStyle}" Baseline="0" Minimum="0"/>
 </charts:XYChart.YAxes>

 <charts:XYChart.XAxes>
   <charts:XYGroupedAxis x:Name="XAxisGrouped" AreLabelsVisible="True" LabelAngle="-75"
                                LabelStyle="{StaticResource XAxisLabelStyle}" Style="{StaticResource XAxisStyle}"/>
 </charts:XYChart.XAxes>

Hi Bill,

Have you checked into the XYGroupedAxis.GroupingFunc?  You can specify a function there that takes two data items and returns a boolean whether they are grouped.

Hey,

I tried using the GroupedFunc property, but this does not resolve the issue. It appears that the first series data that is added establishes the full range of the X axis string labels using the LabelFunc property. If another series is added to the chart with an additional few X axis labels that are not present in the first added series data, then the missing or new data item labels are just automatically stacked onto the first bar in the chart as they don't have an existing X axis label or range item to plot against.

Is there a way to establish programmatically the range of data to use for the X axis (using GroupedAxis because of string label identifiers), prior to adding the series data or does it always require automatic calculation when the first series data is added?

I believe it's set from the data and can't be modified programmatically.  Could you possibly update the first series to be a union of all the group possibilities?  And for data points not in the first series that are in the second series, put a zero value in the first series for them.  That would likely establish all the groups you'd need then.

Hey,   I used your suggestion on establishing a common set of series data and this works fine!

Thanks for the help.