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psview.C File Reference

Detailed Description

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An example how to display PS, EPS, PDF files in canvas.

To load a PS file in a TCanvas, the ghostscript program needs to be install.

  • On most unix systems it is installed by default.
  • On Windows it has to be installed from http://pages.cs.wisc.edu/~ghost/ also the place where gswin32c.exe sits should be added in the PATH. One way to do it is:
    1. Start the Control Panel
    2. Double click on System 3, Open the "Advanced" tab
    3. Click on the "Environment Variables" button
    4. Find "Path" in "System variable list", click on it.
    5. Click on the "Edit" button.
    6. In the "Variable value" field add the path of gswin32c (after a ";") it should be something like: "C:\Program Files\gs\gs8.13\bin"
    7. click "OK" as much as needed.
#include "TROOT.h"
#include "TCanvas.h"
#include "TImage.h"
void psview()
// set to batch mode -> do not display graphics
// create a PostScript file
TString dir = gROOT->GetTutorialDir();
// back to graphics mode
// create an image from PS file
TImage *ps = TImage::Open("feynman.eps");
if (!ps) {
printf("GhostScript (gs) program must be installed\n");
new TCanvas("psexam", "Example how to display PS file in canvas", 600, 400);
TLatex *tex = new TLatex(0.06,0.9,"The picture below has been loaded from a PS file:");
TPad *eps = new TPad("eps", "eps", 0., 0., 1., 0.75);
#define gROOT
Definition TROOT.h:407
#define gPad
The Canvas class.
Definition TCanvas.h:23
An abstract interface to image processing library.
Definition TImage.h:29
static TImage * Open(const char *file, EImageFileTypes type=kUnknown)
Open a specified image file.
Definition TImage.cxx:118
To draw Mathematical Formula.
Definition TLatex.h:18
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition TObject.cxx:274
The most important graphics class in the ROOT system.
Definition TPad.h:28
TVirtualPad * cd(Int_t subpadnumber=0) override
Set Current pad.
Definition TPad.cxx:640
void Draw(Option_t *option="") override
Draw Pad in Current pad (re-parent pad if necessary).
Definition TPad.cxx:1311
Basic string class.
Definition TString.h:139
TString & Append(const char *cs)
Definition TString.h:572
Valeriy Onoutchin

Definition in file psview.C.