Is it possible to set an background image for a RadCartesianChart.
Or change the stroke fill color depending on the value at the point?
<Setter Property="Fill" Value="Red"></Setter>
You can use the PlotAreaStyle property to set the Background of the Border element that represents the plot area of the chart. The background can be assigned to an ImageBrush object.
About the different colors in the line's stroke of a single series, this is not supported. Instead, you can consider using plot band or similar annotation to mark the different sections of the data. Or you can display the default visual elements (ellipses) and color them based on the data point's value.
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