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Dragging the tracball line

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Auvo
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Auvo asked on 30 Jul 2012, 11:00 AM
Hello,

Currently the trackball line follows the mouse cursor when moving mouse cursor over the chartarea.

Can I get following behaviour that trackball line not move until I "drag" it with mouse cursor and then moved it in another place?

Regards,
Auvo

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Petar Marchev
Telerik team
answered on 01 Aug 2012, 06:27 AM
Hello Auvo,

The TrackBall is somewhat an equivalent to a tooltip - it shows some information about what is under the mouse. So we have not designed it to work in any other way and it is not possible to achieve such behavior with the TrackBall.

Kind regards,
Petar Marchev
the Telerik team

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Auvo
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answered on 06 Aug 2012, 09:14 AM
Hi,

Is there any other way to get that behaviour by using some other controls/methods in RadChartView?

I remember that in RadChart control, there is a CustomGridLine, but does RadChartView have similar control?

Or do you have any other idea how can I get "draggable" crosshair in radChartView?

Regards,
Auvo
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Petar Marchev
Telerik team
answered on 07 Aug 2012, 11:02 AM
Hi Auvo,

The custom grid lines in RadChart are annotations. Currently there are no annotations in RadChartView, but we are working on this feature for the next official release (in about two months from now). Can you please explain what is the reason you need this draggable line? What are the semantics underneath this? What information will this bring into view, and how will it improve the perception of the data? The reason I am asking is because we are currently working on the annotations and if we decide that the depicted scenario is valid and valuable, we might consider making it an out-of-the-box feature.

Currently the only way I can see this happening is if you place a Line on top of the chart and manage its dragging manually.   

Kind regards,
Petar Marchev
the Telerik team

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Auvo
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answered on 21 Aug 2012, 10:45 AM
Hi,

Our application, which uses the RadChartView, is used in process industries to show timebased data. By using this application, user can analyzing the process data and find the abnormal situations from the process. 

There are several cases where we need "draggable" cursor feature.

One is that we should have possibility to add&move several draggable lines on the chart area, and do calculations and analyzing from selected graphs between those lines. (see the trenddraggablecursor.png)

Another thing is that user should move and leave the cursor line in interesting position of the chartarea (e.g. abnormal situation in the process) and then print the current view with cursor to the paper. Currently cursor lines moves when moving mouse cursor away from the chatarea, not good.

Also, requirement is that user should move and leave the cursor line in specific position at the chart area and when application gets automatically new data to the chart area, cursor line shows the value of selected graphs on that position

These are requirements from our customers, so we really hope that you consider to make this as out-of-the-box feature

Let me know if you need more information of these requirements

Regards,
Auvo
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Petar Marchev
Telerik team
answered on 24 Aug 2012, 06:59 AM
Hello Auvo,

Thank you for the input, I have forwarded this to our Data Visualization Team Leads!

Greetings,
Petar Marchev
the Telerik team

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