TCutG in Embedded Canvas

ROOT
1

Hi Rooters,

I’m trying to use a TCutG in an embedded canvas: I tried 2 solutions.

First:

[code] TCutG* cutg;

gROOT->SetEditorMode("CutG");
cout << "cut begin" << endl;
cutg = (TCutG*)c1->WaitPrimitive("c","CutG");// I named the cut 'c'
cout << "cut finished" << endl;

cutg=(TCutG *)gROOT->FindObject("c");

TH2F *tkeahisto = new TH2F("tkeahisto","tkeahisto",160,40,200,110,100,210);
a->Project("tkeahisto","TKE:A","c");
tkeahisto->DrawNormalized("COLZ" ,1);
c1->Update();
c1->cd(2)->Modified();

[/code]

This produces a segmentation violation

Other try:

[code] TCutG* cutg;

gROOT->SetEditorMode("CutG");
cout << "cut begin" << endl;
cutg = (TCutG*)c1->WaitPrimitive("c","CutG");// I named the cut 'c'
cout << "cut finished" << endl;

cutg=(TCutG *)gROOT->FindObject("c");

TH2F *tkeahisto = new TH2F("tkeahisto","tkeahisto",160,40,200,110,100,210);
a->Project("tkeahisto","TKE:A",cutg);
tkeahisto->DrawNormalized("COLZ" ,1);
c1->Update();
c1->cd(2)->Modified();

[/code]

This produces an error of this type : Error: Can’t call TTree::Project(“tkeahisto”,“TKE:A”,cutg) in current scope

Hoping someone can find the solution to make work an interactive graphical cut in an embedded canvas

Thanks

2

Your second approach cannot work (as indicated by the compiler). The third argument to TTree::Project must be a const char*

Your first approach should work. Could you send the shortest possible running script reproducing the problem togather with a small data file/

Rene

3

Attached two files : a Root file and the code.

please type .L try.cpp
Then embcutG(“root.root”)

A segmentation violation error will occur.
If you find the problem, i will bw very happy!

Thanks
try1.cpp (4.13 KB)

4

attached

When the program is launched, click on CutG qnd then , draw a contour on the plot. Double click when finished to draw to close the contour. Then , click on draw.

Error!

Hope someone will find.

Thanks
root.root (68.8 KB)

5

I can run your test without problem. I get the following output and also a canvas with a color plot.

Root [0] .L try1.cpp Root [1] embcutG("root.root") here 1 root.root TFile** root.root TFile* root.root KEY: TTree t;1 light heavy yield Slot DoDraw() Re Draw OK Root [2]

Unfortunately you do not specify your version of ROOT. In case you use an old version, I suggest trying with version 5.18 or 5.19

Rene

6

I use Root 5.18//00

But have you launch the graphical cut ? It seems that you didn’t use it when viewing your terminal.

When the canvas appears, click on CutG button and then draw a contour on the first plot.

Then, click on draw button.

Hope it works too.

Thanks

7

see my comments in function DoDraw in attachment

Rene
try1.cpp (4.59 KB)

8

OK it works thanks