ROOT   Reference Guide
earth.C File Reference

## Detailed Description

This tutorial illustrates the special contour options.

• "AITOFF" : Draw a contour via an AITOFF projection
• "MERCATOR" : Draw a contour via an Mercator projection
• "SINUSOIDAL" : Draw a contour via an Sinusoidal projection
• "PARABOLIC" : Draw a contour via an Parabolic projection
TCanvas *earth(){
TCanvas *c1 = new TCanvas("c1","earth_projections",700,700);
c1->Divide(2,2);
TH2F *ha = new TH2F("ha","Aitoff", 180, -180, 180, 179, -89.5, 89.5);
TH2F *hm = new TH2F("hm","Mercator", 180, -180, 180, 161, -80.5, 80.5);
TH2F *hs = new TH2F("hs","Sinusoidal",180, -180, 180, 181, -90.5, 90.5);
TH2F *hp = new TH2F("hp","Parabolic", 180, -180, 180, 181, -90.5, 90.5);
TString dat = gROOT->GetTutorialDir();
dat.Append("/graphics/earth.dat");
dat.ReplaceAll("/./","/");
ifstream in;
in.open(dat.Data());
while (1) {
in >> x >> y;
if (!in.good()) break;
ha->Fill(x,y, 1);
hm->Fill(x,y, 1);
hs->Fill(x,y, 1);
hp->Fill(x,y, 1);
}
in.close();
c1->cd(1); ha->Draw("aitoff");
c1->cd(2); hm->Draw("mercator");
c1->cd(3); hs->Draw("sinusoidal");
c1->cd(4); hp->Draw("parabolic");
return c1;
}
float Float_t
Definition: RtypesCore.h:57
#define gROOT
Definition: TROOT.h:404
R__EXTERN TStyle * gStyle
Definition: TStyle.h:414
The Canvas class.
Definition: TCanvas.h:23
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3060
2-D histogram with a float per channel (see TH1 documentation)}
Definition: TH2.h:257
Int_t Fill(Double_t) override
Invalid Fill method.
Definition: TH2.cxx:347
Basic string class.
Definition: TString.h:136
const char * Data() const
Definition: TString.h:369
TString & ReplaceAll(const TString &s1, const TString &s2)
Definition: TString.h:692
TString & Append(const char *cs)
Definition: TString.h:564
void SetOptTitle(Int_t tit=1)
Definition: TStyle.h:319
void SetOptStat(Int_t stat=1)
The type of information printed in the histogram statistics box can be selected via the parameter mod...
Definition: TStyle.cxx:1589
Double_t y[n]
Definition: legend1.C:17
return c1
Definition: legend1.C:41
Double_t x[n]
Definition: legend1.C:17

Definition in file earth.C.