{
"cells": [
{
"cell_type": "markdown",
"id": "b5f55e05",
"metadata": {},
"source": [
"# tree142_parallelcoordtrans\n",
"Use of transparency with ||-Coord.\n",
"\n",
"It displays the same data set twice. The first time without transparency and\n",
"the second time with transparency. On the second plot, several clusters\n",
"appear.\n",
"\n",
"### Images without and with transparency\n",
"\n",
"\n",
"### Transparency works in PDF files\n",
"\n",
"\n",
"\n",
"\n",
"\n",
"**Author:** Olivier Couet \n",
"This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, May 19, 2026 at 08:19 PM."
]
},
{
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"source": [
"%%cpp -d\n",
"#include \"TFile.h\"\n",
"#include \"TCanvas.h\"\n",
"#include \"TStyle.h\"\n",
"#include \"TRandom.h\"\n",
"#include \"TNtuple.h\"\n",
"#include \"TParallelCoord.h\"\n",
"#include \"TParallelCoordVar.h\"\n",
"#include \"TParallelCoordRange.h\"\n",
"\n",
"Double_t r1, r2, r3, r4, r5, r6, r7, r8, r9;\n",
"Double_t dr = 3.5;\n",
"TRandom *r;"
]
},
{
"cell_type": "markdown",
"id": "745a8cce",
"metadata": {},
"source": [
" Definition of a helper function: "
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "3dfd3d3a",
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"collapsed": false,
"execution": {
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"source": [
"%%cpp -d\n",
"void generate_random(Int_t i)\n",
"{\n",
" r->Rannor(r1, r4);\n",
" r->Rannor(r7, r9);\n",
" r2 = (2 * dr * r->Rndm(i)) - dr;\n",
" r3 = (2 * dr * r->Rndm(i)) - dr;\n",
" r5 = (2 * dr * r->Rndm(i)) - dr;\n",
" r6 = (2 * dr * r->Rndm(i)) - dr;\n",
" r8 = (2 * dr * r->Rndm(i)) - dr;\n",
"}"
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "118263ce",
"metadata": {
"collapsed": false,
"execution": {
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"source": [
"Double_t x, y, z, u, v, w, a, b, c;\n",
"Double_t s1x, s1y, s1z;\n",
"Double_t s2x, s2y, s2z;\n",
"Double_t s3x, s3y, s3z;\n",
"r = new TRandom();\n",
"\n",
"auto c1 = new TCanvas(\"c1\", \"c1\", 0, 0, 900, 1000);\n",
"c1->Divide(1, 2);\n",
"\n",
"auto nt = new TNtuple(\"nt\", \"Demo ntuple\", \"x:y:z:u:v:w:a:b:c\");\n",
"\n",
"int n=0;\n",
"for (Int_t i = 0; i < 1500; i++) {\n",
" r->Sphere(s1x, s1y, s1z, 0.1);\n",
" r->Sphere(s2x, s2y, s2z, 0.2);\n",
" r->Sphere(s3x, s3y, s3z, 0.05);\n",
"\n",
" generate_random(i);\n",
" nt->Fill(r1, r2, r3, r4, r5, r6, r7, r8, r9);\n",
" n++;\n",
"\n",
" generate_random(i);\n",
" nt->Fill(s1x, s1y, s1z, s2x, s2y, s2z, r7, r8, r9);\n",
" n++;\n",
"\n",
" generate_random(i);\n",
" nt->Fill(r1, r2, r3, r4, r5, r6, r7, s3y, r9);\n",
" n++;\n",
"\n",
" generate_random(i);\n",
" nt->Fill(s2x - 1, s2y - 1, s2z, s1x + .5, s1y + .5, s1z + .5, r7, r8, r9);\n",
" n++;\n",
"\n",
" generate_random(i);\n",
" nt->Fill(r1, r2, r3, r4, r5, r6, r7, r8, r9);\n",
" n++;\n",
"\n",
" generate_random(i);\n",
" nt->Fill(s1x + 1, s1y + 1, s1z + 1, s3x - 2, s3y - 2, s3z - 2, r7, r8, r9);\n",
" n++;\n",
"\n",
" generate_random(i);\n",
" nt->Fill(r1, r2, r3, r4, r5, r6, s3x, r8, s3z );\n",
" n++;\n",
"}\n",
"\n",
"TParallelCoordVar *pcv;\n",
"\n",
"c1->cd(1);"
]
},
{
"cell_type": "markdown",
"id": "cf9c4f77",
"metadata": {},
"source": [
"||-Coord plot without transparency"
]
},
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"outputs": [],
"source": [
"nt->Draw(\"x:y:z:u:v:w:a:b:c\", \"\", \"para\");\n",
"TParallelCoord* para1 = (TParallelCoord*)gPad->GetListOfPrimitives()->FindObject(\"ParaCoord\");\n",
"para1->SetLineColor(25);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"x\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"y\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"z\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"a\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"b\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"c\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"u\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"v\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para1->GetVarList()->FindObject(\"w\");\n",
"pcv->SetHistogramHeight(0.);"
]
},
{
"cell_type": "markdown",
"id": "c4755a41",
"metadata": {},
"source": [
"||-Coord plot with transparency"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "6b02b3ae",
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"shell.execute_reply": "2026-05-19T20:19:25.379983Z"
}
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"outputs": [],
"source": [
"TColor *col26 = gROOT->GetColor(26);\n",
"col26->SetAlpha(0.01);\n",
"c1->cd(2);\n",
"nt->Draw(\"x:y:z:u:v:w:a:b:c\", \"\", \"para\");\n",
"TParallelCoord* para2 = (TParallelCoord*)gPad->GetListOfPrimitives()->FindObject(\"ParaCoord\");\n",
"para2->SetLineColor(26);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"x\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"y\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"z\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"a\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"b\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"c\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"u\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"v\");\n",
"pcv->SetHistogramHeight(0.);\n",
"pcv = (TParallelCoordVar*)para2->GetVarList()->FindObject(\"w\");\n",
"pcv->SetHistogramHeight(0.);"
]
},
{
"cell_type": "markdown",
"id": "c60b8113",
"metadata": {},
"source": [
"Produce transparent lines in interactive and batch mode"
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "90b58ea8",
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"text": [
"Info in : pdf file parallelcoordtrans.pdf has been created\n",
"Info in : SVG file parallelcoordtrans.svg has been created\n"
]
}
],
"source": [
"c1->Print(\"parallelcoordtrans.pdf\");\n",
"c1->Print(\"parallelcoordtrans.svg\");"
]
},
{
"cell_type": "markdown",
"id": "5f0808a7",
"metadata": {},
"source": [
"Produce transparent lines in batch mode only"
]
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"output_type": "stream",
"text": [
"Info in : jpg file parallelcoordtrans.jpg has been created\n",
"Info in : png file parallelcoordtrans.png has been created\n"
]
}
],
"source": [
"c1->Print(\"parallelcoordtrans.jpg\");\n",
"c1->Print(\"parallelcoordtrans.png\");"
]
},
{
"cell_type": "markdown",
"id": "121afadc",
"metadata": {},
"source": [
"Draw all canvases "
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