ROOT  6.07/01
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h1draw.C File Reference

1-D histogram drawing options. More...

Go to the source code of this file.

Detailed Description

1-D histogram drawing options.

We attach (or generate) the ROOT file in $ROOTSYS/tutorials/hsimple.root or $PWD/hsimple.root We draw one histogram in different formats.

pict1_h1draw.C.png
#include "TInterpreter.h"
#include "TCanvas.h"
#include "TSystem.h"
#include "TFile.h"
#include "TH2.h"
#include "TNtuple.h"
#include "TPaveLabel.h"
#include "TPaveText.h"
#include "TFrame.h"
#include "TSystem.h"
#include "TInterpreter.h"
void h1draw()
{
TString dir = gSystem->UnixPathName(__FILE__);
dir.ReplaceAll("h1draw.C","../hsimple.C");
dir.ReplaceAll("/./","/");
if (gBenchmark->GetBench("hsimple") < 0) gInterpreter->LoadMacro(dir.Data());
TFile *example = (TFile*)gROOT->ProcessLineFast("hsimple(1)");
if (!example) return;
example->ls();
TH1 *hpx = (TH1*)example->Get("hpx");
TCanvas *c1 = new TCanvas("c1","Histogram Drawing Options",200,10,700,900);
TPad *pad1 = new TPad("pad1",
"The pad with the function",0.03,0.62,0.50,0.92,21);
TPad *pad2 = new TPad("pad2",
"The pad with the histogram",0.51,0.62,0.98,0.92,21);
TPad *pad3 = new TPad("pad3",
"The pad with the histogram",0.03,0.02,0.97,0.57,21);
pad1->Draw();
pad2->Draw();
pad3->Draw();
// Draw a global picture title
TPaveLabel *title = new TPaveLabel(0.1,0.94,0.9,0.98,
"Drawing options for one dimensional histograms");
title->SetFillColor(16);
title->SetTextFont(52);
title->Draw();
// Draw histogram hpx in first pad with the default option.
pad1->cd();
pad1->GetFrame()->SetFillColor(18);
hpx->SetFillColor(45);
hpx->DrawCopy();
TPaveLabel *label1 = new TPaveLabel(-3.5,700,-1,800,"Default option");
label1->SetFillColor(42);
label1->Draw();
// Draw hpx as a lego. Clicking on the lego area will show
// a "transparent cube" to guide you rotating the lego in real time.
pad2->cd();
hpx->DrawCopy("lego1");
TPaveLabel *label2 = new TPaveLabel(-0.72,0.74,-0.22,0.88,"option Lego1");
label2->SetFillColor(42);
label2->Draw();
TPaveLabel *label2a = new TPaveLabel(-0.93,-1.08,0.25,-0.92,
"Click on lego to rotate");
label2a->SetFillColor(42);
label2a->Draw();
// Draw hpx with its errors and a marker.
pad3->cd();
pad3->SetGridx();
pad3->SetGridy();
pad3->GetFrame()->SetFillColor(18);
hpx->SetMarkerStyle(21);
hpx->Draw("e1p");
TPaveLabel *label3 = new TPaveLabel(2,600,3.5,650,"option e1p");
label3->SetFillColor(42);
label3->Draw();
// The following illustrates how to add comments using a PaveText.
// Attributes of text/lines/boxes added to a PaveText can be modified.
// The AddText function returns a pointer to the added object.
TPaveText *pave = new TPaveText(-3.78,500,-1.2,750);
pave->SetFillColor(42);
TText *t1=pave->AddText("You can move");
t1->SetTextColor(4);
t1->SetTextSize(0.05);
pave->AddText("Title and Stats pads");
pave->AddText("X and Y axis");
pave->AddText("You can modify bin contents");
pave->Draw();
c1->Update();
}
Author
Rene Brun

Definition in file h1draw.C.