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Zooming on button click using TChart

delphi tchart

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#1 AlecR

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Posted 25 December 2014 - 12:48 PM

Hi all,

 

I am using TChart to create graphs.

 

I have this procedure:

procedure TfrmGraphingMode.btnZoomInClick(Sender: TObject);
  begin
 
  end;

What I am trying to do is to zoom in the graph on the click of btnZoomIn. I think a zoom of 10% per click would be a good start.

How would I go about doing this? Zooming out is easier but I am having trouble getting zooming in to work. chtGraph.ZoomPercent, for example, doesn't do anything.

 

If a kind person could explain that would be fantastic :)



#2 BlackRabbit

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Posted 28 December 2014 - 12:19 PM

Look for zooming drag in in this wiki and you'll find out how to work the zoom in rectangle extent.