# parallelcoordtrans¶

Use of transparency with ||-Coord.

It displays the same data set twice. The first time without transparency and the second time with transparency. On the second plot, several clusters appear.

### Transparency works in PDF files¶

Author: Olivier Couet
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Thursday, August 18, 2022 at 09:51 AM.

In [1]:
%%cpp -d
#include "TFile.h"
#include "TCanvas.h"
#include "TStyle.h"
#include "TRandom.h"
#include "TNtuple.h"
#include "TParallelCoord.h"
#include "TParallelCoordVar.h"
#include "TParallelCoordRange.h"

Double_t r1,r2,r3,r4,r5,r6,r7,r8,r9;
Double_t dr = 3.5;
TRandom *r;


Definition of a helper function:

In [2]:
%%cpp -d
void generate_random(Int_t i) {
r->Rannor(r1,r4);
r->Rannor(r7,r9);
r2 = (2*dr*r->Rndm(i))-dr;
r3 = (2*dr*r->Rndm(i))-dr;
r5 = (2*dr*r->Rndm(i))-dr;
r6 = (2*dr*r->Rndm(i))-dr;
r8 = (2*dr*r->Rndm(i))-dr;
}

In [3]:
Double_t x,y,z,u,v,w,a,b,c;
Double_t s1x, s1y, s1z;
Double_t s2x, s2y, s2z;
Double_t s3x, s3y, s3z;
r = new TRandom();;

auto c1 = new TCanvas("c1", "c1",0,0,900,1000);
c1->Divide(1,2);

auto nt = new TNtuple("nt","Demo ntuple","x:y:z:u:v:w:a:b:c");

int n=0;
for (Int_t i=0; i<1500; i++) {
r->Sphere(s1x, s1y, s1z, 0.1);
r->Sphere(s2x, s2y, s2z, 0.2);
r->Sphere(s3x, s3y, s3z, 0.05);

generate_random(i);
nt->Fill(r1, r2, r3, r4, r5, r6, r7, r8, r9);
n++;

generate_random(i);
nt->Fill(s1x, s1y, s1z, s2x, s2y, s2z, r7, r8, r9);
n++;

generate_random(i);
nt->Fill(r1, r2, r3, r4, r5, r6, r7, s3y, r9);
n++;

generate_random(i);
nt->Fill(s2x-1, s2y-1, s2z, s1x+.5, s1y+.5, s1z+.5, r7, r8, r9);
n++;

generate_random(i);
nt->Fill(r1, r2, r3, r4, r5, r6, r7, r8, r9);
n++;

generate_random(i);
nt->Fill(s1x+1, s1y+1, s1z+1, s3x-2, s3y-2, s3z-2, r7, r8, r9);
n++;

generate_random(i);
nt->Fill(r1, r2, r3, r4, r5, r6, s3x, r8, s3z );
n++;
}

TParallelCoordVar* pcv;

c1->cd(1);


||-Coord plot without transparency

In [4]:
nt->Draw("x:y:z:u:v:w:a:b:c","","para");
para1->SetLineColor(25);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("x"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("y"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("z"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("a"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("b"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("c"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("u"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("v"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject("w"); pcv->SetHistogramHeight(0.);


||-Coord plot with transparency

In [5]:
TColor *col26 = gROOT->GetColor(26); col26->SetAlpha(0.01);
c1->cd(2);
nt->Draw("x:y:z:u:v:w:a:b:c","","para");
para2->SetLineColor(26);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("x"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("y"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("z"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("a"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("b"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("c"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("u"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("v"); pcv->SetHistogramHeight(0.);
pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject("w"); pcv->SetHistogramHeight(0.);


Produce transparent lines in interactive and batch mode

In [6]:
c1->Print("parallelcoordtrans.pdf");
c1->Print("parallelcoordtrans.svg");

Info in <TCanvas::Print>: pdf file parallelcoordtrans.pdf has been created
Info in <TCanvas::Print>: SVG file parallelcoordtrans.svg has been created


Produce transparent lines in batch mode only

In [7]:
c1->Print("parallelcoordtrans.jpg");
c1->Print("parallelcoordtrans.png");

Info in <TCanvas::Print>: jpg file parallelcoordtrans.jpg has been created
Info in <TCanvas::Print>: png file parallelcoordtrans.png has been created


Draw all canvases

In [8]:
gROOT->GetListOfCanvases()->Draw()