How To get Value when zooming in chart

[JBA]

Hi,

I'm trying to use chart Zoom event in Asp.net. How can I obtain x-y values from Chart Zoom event args ?

First of all I  bind a data to my chart after user zooms, according to the zoom args I want to bind another data source to chart because of performance issue. How can I manage my plan ?

tnx.

[Petar Marchev]

Hi Javad,

Extracting the selected x and y values is not possible with out-of-the-box means. However, I think that you will be able to manually calculate these values in the Zoom event:

void radChart1_Zoom(object sender, ChartZoomEventArgs e)
{
 floatxScrollOffset = this.radChart1.ClientSettings.XScrollOffset;
 floatyScrollOffset = this.radChart1.ClientSettings.YScrollOffset;

 floatxScale = this.radChart1.ClientSettings.XScale;
 floatyScale = this.radChart1.ClientSettings.YScale;
}

 
I hope that the above suggestion is of help.

Greetings,
Petar Marchev
the Telerik team

[JBA]

i need to get value of xAxis, yAxis data on chart.
for ex: when user zoom in value (7,6), we give (2 , 1.3) in zooming event.

[Petar Marchev]

Hello Javad,

I am not sure what is your question here.

It is not possible for me to give a general solution for this, as it depends on how you have set up the series mappings. However, I believe that extracting the selected x and y values is possible and it is SeriesMapping-specific.

For instance, if you know that you x values range from 50 to 150 and in the zoom event handler the xScale is 2.0 and the xScrollOffset is 0.25 - then the selected x range is [75, 125].  

Kind regards,
Petar Marchev
the Telerik team