Save/Restore Pan/Zoom RadCartesianChart

[Reilly]

I'm using 2017.3.1018.45 on 64-bit Windows 10 and Visual Studio 2017.

My application has a single chart view. I can change the data that is displaying. The DataContext changes out from under the view. When the DataContextChanged message arrives, I:

   1. save the current pan/zoom settings for the chart.

   2. clear all series.

   3. generate all series for the new data context

   4. restore the pan/zoom settings that were saved from the last time this data was displayed.

Except that it doesn't work at all. I have tried saving and restoring: Zoom, PanOffset, Horizontal/Vertical-ZoomRange-Start/End.

At first, I tried just saving/restoring Zoom and PanOffset. I could successfully set the Zoom, but the PanOffset was always (0,0) after the set.

I have tried invoking my restore operation on the dispatcher during Idle, so it should be done after everything has been complete.

Any ideas?

-John.

 

 

[Martin Ivanov]

Hi John,

I can't tell why the reported issue appears because I am not familiar with your setup. But, I've prepared a small example, based on your description, that shows saving/restoring the HorizontalZoomRangeStart/End properties. Can you please give it a try and let me know if I am missing something?

Regards,
Martin Ivanov
Progress Telerik

[Reilly]

Hi Martin,

Your example was helpful.

When I change my application to save / restore only the Horizontal/VerticalZoomRangeStart/End properties, it works just fine.

I had been doing save / restore of the PanOffset and Zoom properties in addition to the ZoomRange properties. That did not work.

I thought I had tried just the ZoomRange properties, but I guess I hadn't. 

Thanks for your help. Always appreciated.

Highest regards,

-John Reilly.