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Zooming with new ChartSeriesItems

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Mario
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Mario asked on 02 Dec 2008, 12:30 PM

Hello people!

I'm using a RadChart, where I create the ChartSeries in VB code.

My X Axis is time, and I'm interpolating values from database. In the interpolation, I can choose the interpolation interval, which defines the precision of my chart. This interpolation time defines the frequency where points will be generated. Example: 10s means, one point generated for every 10s in X axis.

This is working fine.

Now I want to change the interpolation time interval when user uses zoom in the graph. The reason is because with zoom, X axis will be smaller than before, and then, I can have more precision.

 

I need to interpolate again and generate the ChartSeries again when the zoom is required. Does anyone know how to handle this?

 

Thanks in advance.

 

Best regards,

 

Mario

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Vladimir Milev
Telerik team
answered on 08 Dec 2008, 12:56 PM
Hello Mario,

Unfortunately we have not exposed a server side event on the control which is triggered whenever the zoom level is changed. I'm guessing this would be a convenient spot for you to perform this change.

As an alternative solution I would suggest to use the PreRender stage to check the zoom factor and adjust your interpolation to an appropriate number based on the zoom factor. To check the zoom factor you can use the ClientSettings object of RadChart.

We will consider adding an event to facilitate this process.

All the best,
Vladimir Milev
the Telerik team

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