ROOT   Reference Guide
parallelcoordtrans.C File Reference

## Detailed Description

Script illustrating the 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.

#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");
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");
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");
}

Definition in file parallelcoordtrans.C.

c
#define c(i)
Definition: RSha256.hxx:101
TParallelCoordVar
TParallelCoord axes.
Definition: TParallelCoordVar.h:24
n
const Int_t n
Definition: legend1.C:16
TNtuple
A simple TTree restricted to a list of float variables only.
Definition: TNtuple.h:28
TList::FindObject
virtual TObject * FindObject(const char *name) const
Find an object in this list using its name.
Definition: TList.cxx:577
r
ROOT::R::TRInterface & r
Definition: Object.C:4
TParallelCoord::GetVarList
TList * GetVarList()
Definition: TParallelCoord.h:102
TRandom.h
TParallelCoordVar.h
TStyle.h
TParallelCoord
Parallel Coordinates class.
Definition: TParallelCoord.h:28
Int_t
int Int_t
Definition: RtypesCore.h:45
x
Double_t x[n]
Definition: legend1.C:17
TCanvas.h
v
@ v
Definition: rootcling_impl.cxx:3635
b
#define b(i)
Definition: RSha256.hxx:100
TFile.h
TNtuple.h
TParallelCoordRange.h
TRandom
This is the base class for the ROOT Random number generators.
Definition: TRandom.h:27
TColor
The color creation and management class.
Definition: TColor.h:19
a
auto * a
Definition: textangle.C:12
TParallelCoord.h
TTree::Draw
virtual void Draw(Option_t *opt)
Default Draw method for all objects.
Definition: TTree.h:427
y
Double_t y[n]
Definition: legend1.C:17
TColor::SetAlpha
virtual void SetAlpha(Float_t a)
Definition: TColor.h:67
Double_t
double Double_t
Definition: RtypesCore.h:59
TParallelCoordVar::SetHistogramHeight
void SetHistogramHeight(Double_t h=0)
Set the height of the bar histogram.
Definition: TParallelCoordVar.cxx:892
TCanvas
The Canvas class.
Definition: TCanvas.h:23