How can I set PanOffset according to current Data

[Vadim]

Hello, 
I have an issue for ChartView - set scrollbar position according to current selection in GridView.
ChartView has horizontal DateTimeContinuousAxis. GridView contains Range Column (from, to).
Do you have any ideas, how to help me?

Thanks,
Vadim

[Petar Marchev]

Hi Vadim,

If I understand correctly - you have a chart view and a grid view and the grid view contains information about some timely intervals - such as a start date and an end date. When a row is selected - you need the chart to zoom into the selected interval.

There is no out-of-the-box feature that allows such a behavior. However, there are ways to achieve this. One is to manipulate the Zoom and PanOffset properties of the chart.

I have attached a project that demonstrates this. The grid view contains information about start date and end date. When I select a row - the start date and end date are extracted from the selected row. Then, based on the current chart axis width - the new Zoom and PanOffset are calculated and then set.

I hope this helps.

Greetings,
Petar Marchev
the Telerik team

[Vadim]

Hi Petar,

Thanks a lot for the solution. It works for me in most cases.
But in some cases we need to display at X-Axis up to 5 or 15 minutes intervals. For this purpose Zoom and Pan doesn't work as expected. (Scroll is located far from the current interval). What can I do to change this behavior?

Best regards,
Vadim

[Petar Marchev]

Hi Vadim,

Did you try to set the MinimumRangeSpan to a smaller value? In the previously provided project I have placed a style targeting a PanZoomBar in the user control's resources. There you can try to change the minimum range span. Currently there is a known issue - if the chart view is zoomed too much then the chart view will not draw values properly. That is why I had set the minimum range span in the first place.

However, you can try it to see if it will work for your project. If this is not applicable then I would have to suggest that you you pass a new items source to to the chart view when the selected item has changed. This way no zooming will be applied at all.

I am not familiar with your current requirements but may be a RadTimeBar will be a better fit for your project. You can examine the time bar's examples here.

Regards,
Petar Marchev
the Telerik team