doc/v636/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

TRangeDynCast
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Definition TCollection.h:358

ROOT::Detail::TRangeCast
Definition TCollection.h:311

TCanvas
The Canvas class.
Definition TCanvas.h:23

TF1::SetParameters
virtual void SetParameters(const Double_t *params)
Definition TF1.h:685

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

TH2D
2-D histogram with a double per channel (see TH1 documentation)
Definition TH2.h:356

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

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