Applying ChartTrackBallBehavior to a CartesianChart with ScatterLine/ScatterPoint series does not take any effect.

As of the latest release (10/04/2019) RadPieChart with a PieSeries having LabelBinding set to a property name, and ShowLabels set to True, with the list of data bound to ItemsSource containing one or more empty pie slices (a null in the list), causes a System.Reflection.TargetException to be thrown on load of the page containing the chart in iOS (this scenario works fine in UWP).

I am using the latest available Visual Studio 2019 (16.3.5) and the latest available Xamarin.Forms package (4.2.0.848062) and testing on an iPad with iOS 13.1.  The reason I need to have a null value in the list is so that the custom color palette I'm applying will always apply the same colors to the same data points (pie slices), even though in some cases, zero or one or two of the three pie slices will have no data value (and so should not appear in the chart, but still "use up" the corresponding color in the 3 colors of the palette).

In the 08/02/2019 release, this scenario worked fine in iOS (the 09/13/2019 release had the https://feedback.telerik.com/xamarin/1431067-chart-ios-invalidcastexception-is-thrown-when-the-chart-is-loaded issue, which is now resolved in the 10/04/2019 release, but which prevented my testing in iOS since in my app I had RadCartesianCharts on the same pages as the RadPieCharts).

The newly broken functionality in iOS could possibly be related to two other items that are marked completed:
https://feedback.telerik.com/xamarin/1366403-piechart-tooltip-behavior-is-not-working-properly (in 10/04/2019 release)
https://feedback.telerik.com/xamarin/1365842-chart-null-value-support (in R3 2018 SP release)

Support the ability to apply palette (separate color) per point for a line series.

When the series data is updated and axis labels are redrawn, occasionally the default DateTime format is shown in DateTimeContinuousAxis.

Hello, 

I am using Telerik RadCartesianChart to display 5 different series. As per requirement, I need to use a secondary vertical Axis for the 5th series. I followed https://www.telerik.com/forums/multi-axes-chart-xamarin-ios to achieve that.  But if I bind data after a delay then it's not working for iOS.

Steps:
1. Bind series data after delay.

For more details please refer attached files.

I look forward to your reply!

Regards,
Ajay Dodiya | Sr. Xamarin Developer

When you set custom stroke to ScatterLineSeries, the colors in the RadLegend are not updated.

When the Chart Series' ItemsSource is bound to an ObservableCollection, frequent updates of that collection leads to a Java.Lang.IndexOutOfBoundsException on Android.

Setting SelectedPointOffset and RadiusFactor in DonutSeries or PieSeries causes unexpected behavior when selecting a pie piece in the chart.

Hi there,

 

I would like to have support for selecting a slice of the piechart from code-behind. I have have looked into the chart and series properties but found no selectable datapoints property. The chartSelectionBehavior offers a ClearSelection method and the readonly SelectedPoints property, but nothing to add a selected point.

 

SelectionChanged event of the Chart SelectionBehavior is not raised for LineSeries when DataPointSelectionMode is "Single" and  SeriesSelectionMode is "None".  

 Currently chart's horizontal axis is at the very bottom of the chart.




When there are negative values in the vertical axis, I want the horizontal axis to cross the vertical axis on 0

While using the trackball feature some axis labels are disappearing. While trackball is activated with tap and hold, dragging down makes the bottom label on the y-axis disappear and dragging left makes the first label on the x-axis disappear.

If we have a Chart with combined barseries and lineseries, and the lineseries is added first, the bars are misaligned - they are not placed in the center of the axis label on Android.

As a workaround, make sure to add first the barseries, then the lineseries.

I am trying to show two LineSeries with 11500 points in each and the chart cannot load at all. The wait time seems to be infinite. I noticed that the chart loads in about 5 seconds when there 5 thousand points, and in about 10 seconds when there are 10 thousand points.

When you zoom in on the graph, it always zooms to the center of the dataset. Even if I try to move, manually, horizontally the graph I lose the position when a point is added.

When point is added and chart is zoomed, cannot scroll to see other data, the chart reset the data visualization from the beginning.

Ability to set a custom Trackball details DataTemplate. This would allow for two scenarios:

- Custom Styling
- Show other values alongside data point values