doc/v628/hist2image_8C.html

#include <TAttImage.h>


void hist2image()

{


   TCanvas *canv = new TCanvas("image", "xygaus + xygaus(5) + xylandau(10)");

   canv->ToggleEventStatus();

   canv->SetRightMargin(0.2);

   canv->SetLeftMargin(0.01);

   canv->SetTopMargin(0.01);

   canv->SetBottomMargin(0.01);


   // histogram as image (hist taken from draw2dopt.C)

   TImage *img = TImage::Create();


   TF2 *f2 = new TF2("f2","(xygaus + xygaus(5) + xylandau(10))",-4,4,-4,4);

   Double_t params[] = {130,-1.4,1.8,1.5,1, 150,2,0.5,-2,0.5, 3600,-2,0.7,-3,0.3};

   f2->SetParameters(params);

   TH2D *h2 = new TH2D("h2","xygaus + xygaus(5) + xylandau(10)",100,-4,4,100,-4,4);

   h2->FillRandom("f2",40000);

   img->SetImage((const Double_t *)h2->GetArray(), h2->GetNbinsX() + 2,

                  h2->GetNbinsY() + 2, gHistImagePalette);

   img->Draw();

   img->StartPaletteEditor();

}

Double_t
double Double_t
Definition RtypesCore.h:59

TAttImage.h

gHistImagePalette
R__EXTERN TImagePalette * gHistImagePalette
Definition TAttImage.h:109

TArrayD::GetArray
const Double_t * GetArray() const
Definition TArrayD.h:43

TAttImage::StartPaletteEditor
virtual void StartPaletteEditor()
Opens a GUI to edit the color palette.
Definition TAttImage.cxx:771

TAttPad::SetBottomMargin
virtual void SetBottomMargin(Float_t bottommargin)
Set Pad bottom margin in fraction of the pad height.
Definition TAttPad.cxx:99

TAttPad::SetLeftMargin
virtual void SetLeftMargin(Float_t leftmargin)
Set Pad left margin in fraction of the pad width.
Definition TAttPad.cxx:109

TAttPad::SetRightMargin
virtual void SetRightMargin(Float_t rightmargin)
Set Pad right margin in fraction of the pad width.
Definition TAttPad.cxx:119

TAttPad::SetTopMargin
virtual void SetTopMargin(Float_t topmargin)
Set Pad top margin in fraction of the pad height.
Definition TAttPad.cxx:129

TCanvas
The Canvas class.
Definition TCanvas.h:23

TCanvas::ToggleEventStatus
virtual void ToggleEventStatus()
Toggle event statusbar.
Definition TCanvas.cxx:2410

TF1::SetParameters
virtual void SetParameters(const Double_t *params)
Definition TF1.h:649

TF2
A 2-Dim function with parameters.
Definition TF2.h:29

TH1::GetNbinsY
virtual Int_t GetNbinsY() const
Definition TH1.h:296

TH1::GetNbinsX
virtual Int_t GetNbinsX() const
Definition TH1.h:295

TH2D
2-D histogram with a double per channel (see TH1 documentation)}
Definition TH2.h:300

TH2::FillRandom
void FillRandom(const char *fname, Int_t ntimes=5000, TRandom *rng=nullptr) override
Fill histogram following distribution in function fname.
Definition TH2.cxx:668

TImage
An abstract interface to image processing library.
Definition TImage.h:29

TImage::Create
static TImage * Create()
Create an image.
Definition TImage.cxx:35

TImage::SetImage
virtual void SetImage(const Double_t *, UInt_t, UInt_t, TImagePalette *=nullptr)
Definition TImage.h:116

TObject::Draw
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition TObject.cxx:274