Hi Chris, An example in the following script Rene Brun //file cexec.C // root > .x cexec.C // when zooming on the x or y axis of the contour plot // the projection will automatically be zoomed TH2F *h2; TPad *pad2; TH1D *hp; void cexec() { h2 = new TH2F("h2","h2",30,-3,3,30,-3,3); Double_t x,y; for (Int_t i=0;i<10000;i++) { gRandom->Rannor(x,y); h2->Fill(x,y); } TCanvas *c1 = new TCanvas("c1","c1",10,10,800,500); c1->Divide(2,1); c1->cd(2); pad2 = (TPad*)gPad; c1->cd(1); h2->Draw("cont"); TExec *ex = new TExec("ex","cproject()"); h2->GetListOfFunctions()->Add(ex); hp = 0; } void cproject() { TAxis *xaxis = h2->GetXaxis(); TAxis *yaxis = h2->GetYaxis(); Int_t ixmin = xaxis->GetFirst(); Int_t ixmax = xaxis->GetLast(); Int_t iymin = yaxis->GetFirst(); Int_t iymax = yaxis->GetLast(); if (hp) delete hp; hp = h2->ProjectionX("hp",iymin,iymax); hp->GetXaxis()->SetRange(ixmin,ixmax); pad2->cd(); hp->Draw(); } On Fri, 10 Aug 2001, Chris Milne wrote: > Hi there, > > Is there any way to make the scale of one graph automatically change when the > scale of a different graph is manually changed. > > i.e I have two graphs, one contour plot, one ProjectionX. If the scale of the > contour plot is adjusted by the user I want the scale of the Projection to > automatically change. >
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