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Reference Guide
parallelcoordtrans.C File Reference

Detailed Description

View in nbviewer Open in SWAN 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.

Images without and with transparency

Transparency works in PDF files

#include "TFile.h"
#include "TCanvas.h"
#include "TStyle.h"
#include "TRandom.h"
#include "TNtuple.h"
#include "TParallelCoord.h"
Double_t r1,r2,r3,r4,r5,r6,r7,r8,r9;
Double_t dr = 3.5;
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;
}
void parallelcoordtrans() {
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();;
TCanvas *c1 = new TCanvas("c1", "c1",0,0,900,1000);
c1->Divide(1,2);
TNtuple *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++;
}
c1->cd(1);
// ||-Coord plot without transparency
nt->Draw("x:y:z:u:v:w:a:b:c","","para");
TParallelCoord* para1 = (TParallelCoord*)gPad->GetListOfPrimitives()->FindObject("ParaCoord");
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
TColor *col26 = gROOT->GetColor(26); col26->SetAlpha(0.01);
c1->cd(2);
nt->Draw("x:y:z:u:v:w:a:b:c","","para");
TParallelCoord* para2 = (TParallelCoord*)gPad->GetListOfPrimitives()->FindObject("ParaCoord");
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
c1->Print("parallelcoordtrans.pdf");
c1->Print("parallelcoordtrans.svg");
// Produce transparent lines in batch mode only
c1->Print("parallelcoordtrans.gif");
c1->Print("parallelcoordtrans.jpg");
c1->Print("parallelcoordtrans.png");
}
ROOT::R::TRInterface & r
Definition: Object.C:4
#define b(i)
Definition: RSha256.hxx:100
#define c(i)
Definition: RSha256.hxx:101
int Int_t
Definition: RtypesCore.h:43
double Double_t
Definition: RtypesCore.h:57
#define gROOT
Definition: TROOT.h:406
#define gPad
Definition: TVirtualPad.h:287
The Canvas class.
Definition: TCanvas.h:27
The color creation and management class.
Definition: TColor.h:19
virtual void SetAlpha(Float_t a)
Definition: TColor.h:67
virtual TObject * FindObject(const char *name) const
Find an object in this list using its name.
Definition: TList.cxx:577
A simple TTree restricted to a list of float variables only.
Definition: TNtuple.h:28
virtual Int_t Fill()
Fill a Ntuple with current values in fArgs.
Definition: TNtuple.cxx:170
TParallelCoord axes.
void SetHistogramHeight(Double_t h=0)
Set the height of the bar histogram.
Parallel Coordinates class.
void SetLineColor(Color_t col)
TList * GetVarList()
This is the base class for the ROOT Random number generators.
Definition: TRandom.h:27
virtual void Draw(Option_t *opt)
Default Draw method for all objects.
Definition: TTree.h:426
return c1
Definition: legend1.C:41
Double_t y[n]
Definition: legend1.C:17
Double_t x[n]
Definition: legend1.C:17
const Int_t n
Definition: legend1.C:16
auto * a
Definition: textangle.C:12
Author
Olivier Couet

Definition in file parallelcoordtrans.C.