TGraph and Exclusion

ROOT
1

Dear all,

I am trying to use TGraph in order to make exclusion plot…
But the behaviour is completely different than the one shown in the example of the TGraphPainter
root.cern.ch/root/html/TGraphPainter.html

There is a line drawn all over the Filled area…, I obviously want the line only on the exclusion line and not on the complete area circonference. What can I do to have things drawn as in the example?
See my attachement…

Here is the code snippet I use:
TCanvas* c1;
c1 = new TCanvas(“c1”, “c1”,800,600);
TGraph* GluinoExclusion = new TGraph(6,Mass,XSec);
GluinoExclusion->SetLineColor(4);
GluinoExclusion->SetFillColor(4);
GluinoExclusion->SetLineWidth(2002);
GluinoExclusion->SetFillStyle(3004);
GluinoExclusion->Draw(“AL* same”);
SaveCanvas(c1, “”, “GluinoExclusion”);
delete c1;

Thanks for help,
Loic

Capture.PNG672×543 5.56 KB

2

Could you provide the shortest possible running script reproducing your problem?
You seem to define a TGraph with at least 12 points and not 6 as you show in your code snippet!

Rene

3

Salut Rene,

No, there is only 6 points, see the markers on the graph…
But trying to minimalize the macro that reproduce the bug, I unerstood that the problem is only present when “-b” argument is used.

#include "TCanvas.h"
#include "TGraph.h"

void TGraphDebug(){
   double Mass[] = {200,300,400,500,600,900};
   double XSec[] = {6800, 3000, 2800, 2700, 2750, 4000};

   TCanvas* c1 = new TCanvas("c1", "c1",800,600);
   TGraph* GluinoExclusion = new TGraph(6,Mass,XSec);
   GluinoExclusion->SetLineColor(4);
   GluinoExclusion->SetFillColor(4);
   GluinoExclusion->SetLineWidth(2002);
   GluinoExclusion->SetFillStyle(3004);
   GluinoExclusion->Draw("AL*");
   c1->SaveAs("_GluinoExclusion.png");
   c1->SaveAs("_GluinoExclusion.eps");
   c1->SaveAs("_GluinoExclusion.C");
}

Try the following:
root TGraphDebug.C++ -l -b -q
and check the produced picture ( _GluinoExclusion.png )
it will look similar to the one I posted yesterday…
Now do the same, but without “-b” argument:
root TGraphDebug.C++ -l -q
the picture looks as expected…

I think it is a bug,
I would appreciate if you can give me an easy fix, because I need to produce hundreds of plots and “-b” argument is really necessary in that case.

Thanks for help,
Loic,

4

for me (using 5.26 or 5.27) the png file is always correct. Are you using an older version?

Rene

5

This problem was visible only with binary images generated in batch mode. It was visible in stressGraphics for instance. I have fixed it recently. So it is working properly in the last ROOT version.

6

It was fixed in 5.26. See the release notes:
root.cern.ch/root/v526/Version52 … tml#graf2d

  • In TImageDump the hollow filled areas were not correct:
    they used the line attributes,
    a line was drawn around the polygons filled with patterns.
    This fixes the problem mentionned here: savannah.cern.ch/bugs/index.php?59263 as well as the test #22 in stressGraphics (no need to change the reference file).
7

Ok… thanks for the answer,
I am using the root version shipped with CMSSW357, which is 5.22/00d
I will see if I can use a more recent one…

thanks again,
Loic