Problems with zooming

[Dr. Hartmut Kocher]

I found two problems with zooming a line chart:

1) Clipping of data points

Let's say I have 5 points at x = 1..5. If I zoom to x = [1.5, 3.5] the line is only drawn for the points with x = 2,3,4. What i would expect is, that the line is interpolated from x = 1 to x = 2 and drawn starting with x = 1.5...

This is not only true for zooming but for drawing in general (e.g. manual axis).

If no data point is with the specified range, the line is not drawn at all. Instead i would expect the visible sector of the line is drawn.

2) Visibility

I set the visibility of some series using 

_diagram.DefaultView.ChartArea.DataSeries[myIndex].Definition.Visibility = false

However, after zooming or scrolling, all series are visible again.

3) If at least one series has no data in a zoom range, zooming is not possible at all. (see 1)

Please fix this in an upcoming release.

Kind regards

Hartmut

[Dr. Hartmut Kocher]

OK, I found the answer to 2):

It is not enough to set the visibility of the DataSeries, you have to do the same in the series definition. It seems that the value of the series definition is copied every time the zoom factor changes. Therefore, you have to set the visibility in both places.

Kind regards

Hartmut

[Vladimir Milev]

Hello Dr. Hartmut Kocher,

About (1) it is an interesting suggestion and we will definitely consider such an option. The problem is this behavior is a different from what we do right now and it will take some time to rework the control in this fashion. In any way we will definitely think about this option.

Thanks for the feedback!

Sincerely yours,
Vladimir Milev
the Telerik team

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[Daniel]

I would vote for this feature, as we will need it for our project.  I see it hasn't been implemented for the latest version yet (2010.3.1110.35).  I have a range chart with multiple series.  If I zoom in, then only the data points that are in the viewable range are used in generating the range series.  However, this seriously distorts the graph in the process, and this will not work for my project.  Any other work-arounds?

[Vladimir Milev]

Hello Daniel,

Although we have planned our complete backlog for Q1 release we will do our best to squeeze in this fix. I have logged the issue in PITS so you can track its progress and vote for it.

Best wishes,
Vladimir Milev
the Telerik team