TPolyLine outside of 2DHistogram

How to prevent TPolyLine appearing outside of the Histogram? Some dots which define TPolyLine are outside of the 2DHistograms dimensions so it is shown on all available Canvas area , but I only want that part of the colored TPolyLine which is inside of the 2DHistogram to be shown.

Hi @Gec,

thanks for asking! I think this question can be answered best by @couet, whom I invite to take a look at this thread.

In any case, can you please attach a script to show your problem such that he can help more efficiently? Otherwise I’m afraid it will not be possible to help.


Hello @jonas
Thank you for your answer.

This is part of code concerning plot of PolyLine:

  TGraph *min = new TGraph();
  Double_t dx = 0.2; Double_t dy = 0.2;
  Int_t ncolors = gStyle->GetNumberOfColors();
  Double_t x[4],y[4];
  float phi = jet_phi_orig->at(index_max_truthpt);
  cout<<"Jet truth phi orig: "<<phi<<endl; 

  x[0] = truth_PVx; y[0] = truth_PVy;
  x[1] = x[0] + 500.*cos(phi+0.4); y[1] = y[0] + 500.*sin(phi+0.4);
  x[2] = x[0] + 500.*cos(phi-0.4); y[2] = y[0] + 500.*sin(phi-0.4);
  x[3] = x[0];               y[3] = y[0];
  TPolyLine *pl = new TPolyLine(4,x,y);
  pl->SetFillColorAlpha(7, 0.571);
  x[0] = truth_PVx; y[0] = truth_PVy;
  x[1] = x[0] + 50.*cos(phi+0.3); y[1] = y[0] + 50.*sin(phi+0.3);
  x[2] = x[0] + 50.*cos(phi-0.3); y[2] = y[0] + 50.*sin(phi-0.3);
  x[3] = x[0];               y[3] = y[0];
  TPolyLine *pl_bH = new TPolyLine(4,x,y);
  pl_bH->SetFillColorAlpha(8, 0.571);

And declaration of histogram and canvas:

#include "TFile.h"
#include "TTree.h"
#include "TH2D.h"
#include "TH1D.h"
#include "TSystem.h"
#include "TCanvas.h"

#include <string>
#include <vector>
#include <iostream>
#include <iomanip>

using namespace ROOT::VecOps;

//Canvas for lines:
TCanvas *c1 = new TCanvas("c1","Latex",10,53,604,594);   	        

 TH2D *display__1 = new TH2D("display__1","b-hadron display",1000,-100,100,1000,-100,100);

All values like truth_PV are taken from date file. I am sorry that I do not have permit to post whole macro.

Can you post a running macro?

Hi @couet

screenshot with outputs in terminal (not so important) and display:

That does not help. Send a running example.