Dear Rooters,
A macro based slider example on root v2.23 is
//=============macro slider.C=============================
{
gROOT->Reset();
// --- setting canvas and pad
c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500);
c1->SetFillColor(42);
c1->SetGridx();
c1->SetGridy();
pad1 = new TPad("pad1","c1",0.1,0.1,0.9,0.9,18);
pad1->SetGrid();
pad1->SetBottomMargin(0.3);
pad1->SetLeftMargin(.3);
pad1->SetRightMargin(.3);
pad1->Draw();
// --- Draw a histogram plot
pad1->cd();
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);
}
Float_t xmin = 0;
Float_t xmax = 2;
Float_t ymax = 11;
TH1F *hist = new TH1F("hist","a simple graph",100,xmin,xmax);
hist->SetMaximum(15);
hist->SetMinimum(-2);
hist->Draw();
hist->SetXTitle("X title");
hist->SetYTitle("Y title");
// --- Draw a graph
gr = new TGraph(n,x,y);
gr->SetFillColor(1);
gr->SetLineColor(2);
gr->SetLineWidth(4);
gr->SetMarkerColor(4);
gr->SetMarkerStyle(21);
gr->SetTitle("a simple graph");
gr->Draw("LP");
// --- Create one slider in main canvas
pad1->Update();
c1->Update();
TSlider *xslider = new
TSlider("xslider","x",xmin,ymax,xmax,ymax+1.7);
xslider->SetMethod(".x grSliderAction.C");
}
/*
// --- This macro is another C codes
//===========macro grSliderAction.C==============
{
Int_t nx = hist->GetXaxis()->GetNbins();
Int_t binxmin = nx*xslider->GetMinimum();
Int_t binxmax = nx*xslider->GetMaximum();
hist->GetXaxis()->SetRange(binxmin,binxmax);
c1->Modified();
c1->Update();
}
*/
But the function SetMaximum on a pop-up menu by clicking with the righ
moose button on the TGraph picture can not set and change the Y axis.
I don't know why.
Thanks for any help.
Best Regards,
Yongzhao Zhou
------
Yongzhao Zhou, KLOE, LNF, INFN, Italy
Tel:39-06-94032696 Fax:39-06-94032427
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