Zooming on any axis (x,y,z) with the mouse has been implemented
in version 2.23/12.
Upgrade your system.
Rene Brun
Yongzhao Zhou wrote:
>
> Hello,
> My program has three histograms on three pads on a canvas using ROOT
> v.2.20. I'd like to have a zoom together with them when one of the pads
> has a zoom after Left button of the mouse is clicked on one of the line
> end points, moved and released. So I tried function RangeAxis in order to
> pick up the data of Xmin, Xmax, Ymin, Ymax and put it to others pads. My
> codes to try are simple as:
> gROOT->Reset();
> c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500);
> pad1 = new TPad("pad1","Window N1",0.02,0.02,0.98,0.96,18);
> pad1->Draw();
> pad1->cd();
>
> const Int_t n = 20;
> Float_t x[n], y[n];
> for (Int_t i=0;i<n;i++) {
> x[i] = i*0.1;
> y[i] = 10*sin(x[i]+0.2);
> }
>
> gr = new TGraph(n,x,y);
> gr->Draw("ACP");
>
> gPad->RangeAxis(0,0.1,0.3,0.9); //or gPad->RangeAxis(1,0.44,1.5,12);
> gPad->Modified(kTRUE); //or gPad->Modified();
>
> c1->Update();
>
> The codes seems to be ok but the histogram was same as without function
> RangeAxis.
> Would you please tell me what is happened here.
> Thanks so lot.
> Best,
> ZYZ
>
>
> ------
> Yongzhao Zhou, KLOE, LNF, INFN, Italy
> Tel:39-06-94032696 Fax:39-06-94032427
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