1. Feedback
  2. Xamarin.Forms
  3. 14618

Welcome to the Xamarin.Forms feedback portal. We’re happy you’re here! If you have feedback on how to improve the Xamarin.Forms, we’d love to hear it!

  • Check out the features or bugs others have reported and vote on your favorites. Feedback will be prioritized based on popularity.
  • If you have feedback that’s not listed yet, submit your own.

Thanks for joining our community and helping improve Syncfusion products!

1
Vote

OnTouchMove() in ChartSelectionBehavior doesn't work with ScatterSeries

I try to implement dragging data point in sfChart based on forum

https://www.syncfusion.com/forums/127581/mousedrag-in-sfchart


Within ChartSelectionBehavior class, OnTouchMove() Event


On Android Emulator:

When try to drag point, it seems OnTouchMove() in ChartSelectionBehavior doesn't work with ScatterSeries reliably.

Most of the time it doesn't work.

In VS2019 output, it reports

W/monodroid-assembly( 5212): typemap: unable to find mapping to a managed type from Java type 'android/view/DisplayListCanvas'

W/monodroid-assembly( 5212): typemap: unable to find mapping to a managed type from Java type 'android/view/RecordingCanvas'

Changing to LineSeries, it works well with NumericalAxis (no LogarithmicAxis)


On UWP:

The code is working for both ScatterSeries and LineSeries, also both NumericalAxis and LogarithmicAxis.

But the performance is quite bad.

The data point moving is not smooth compared to working Android LineSeries NumericalAxis. Can this be fixed?


Didn't test on iOS yet


See the problem at SampleChart.cs : line 30, 45, 130