Logo ROOT   6.19/01
Reference Guide
csgdemo.C File Reference

Detailed Description

Combinatorial Solid Geometry example.

Stripped down to demonstrate EVE shape-extracts.

  1. Run root csgdemo.C This will produce csg.root containing the extract.
  2. Display the assebly as: root show_extract.C("csg.root")
eve_csgdemo.png
Bool_t raytracing = kTRUE;
#include "TGeoManager.h"
//______________________________________________________________________________
void csgdemo ()
{
gSystem->Load("libGeom");
TControlBar* bar = new TControlBar("vertical", "TGeo composite shapes",20,20);
bar->AddButton("How to run ","help()","Instructions ");
bar->AddButton("Union ", "s_union()", "A + B ");
bar->AddButton("Intersection ", "s_intersection()","A * B ");
bar->AddButton("Difference ", "s_difference()","A - B ");
//These two buttons are disabled cause of bugs
bar->AddButton("Complex composite", "complex_1()","(A * B) + (C - D)");
bar->Show();
gROOT->SaveContext();
}
//______________________________________________________________________________
void MakePicture()
{
gPad->Modified();
gPad->Update();
}
void s_union()
{
gROOT->GetListOfCanvases()->Delete();
TCanvas *c = new TCanvas("composite shape", "Union boolean operation", 700, 1000);
c->Divide(1,2,0,0);
c->cd(2);
gPad->SetPad(0,0,1,0.4);
c->cd(1);
gPad->SetPad(0,0.4,1,1);
if (gGeoManager) delete gGeoManager;
new TGeoManager("xtru", "poza12");
TGeoMaterial *mat = new TGeoMaterial("Al", 26.98,13,2.7);
TGeoMedium *med = new TGeoMedium("MED",1,mat);
TGeoVolume *top = gGeoManager->MakeBox("TOP",med,100,100,100);
// define shape components with names
TGeoPgon *pgon = new TGeoPgon("pg",0.,360.,6,2);
pgon->DefineSection(0,0,0,20);
pgon->DefineSection(1, 30,0,20);
TGeoSphere *sph = new TGeoSphere("sph", 40., 45., 5., 175., 0., 340.);
// define named geometrical transformations with names
TGeoTranslation *tr = new TGeoTranslation(0., 0., 45.);
tr->SetName("tr");
// register all used transformations
// create the composite shape based on a Boolean expression
TGeoCompositeShape *cs = new TGeoCompositeShape("mir", "sph:tr + pg");
TGeoVolume *vol = new TGeoVolume("COMP1",cs);
top->AddNode(vol,1);
top->Draw();
MakePicture();
c->cd(2);
TPaveText *pt = new TPaveText(0.01,0.01,0.99,0.99);
TText *text = pt->AddText("TGeoCompositeShape - composite shape class");
pt->AddText("----- It's an example of boolean union operation : A + B");
pt->AddText("----- A == part of sphere (5-175, 0-340), B == pgon");
pt->AddText(" ");
pt->SetAllWith("-----","color",4);
pt->SetAllWith("-----","font",72);
pt->SetAllWith("-----","size",0.04);
pt->SetTextSize(.044);
pt->Draw();
c->cd(1);
}
void s_intersection()
{
gROOT->GetListOfCanvases()->Delete();
TCanvas *c = new TCanvas("composite shape", "Intersection boolean operation", 700, 1000);
c->Divide(1,2,0,0);
c->cd(2);
gPad->SetPad(0,0,1,0.4);
c->cd(1);
gPad->SetPad(0,0.4,1,1);
if (gGeoManager) delete gGeoManager;
new TGeoManager("xtru", "poza12");
TGeoMaterial *mat = new TGeoMaterial("Al", 26.98,13,2.7);
TGeoMedium *med = new TGeoMedium("MED",1,mat);
TGeoVolume *top = gGeoManager->MakeBox("TOP",med,100,100,100);
// define shape components with names
TGeoBBox *box = new TGeoBBox("bx", 40., 40., 40.);
TGeoSphere *sph = new TGeoSphere("sph", 40., 45.);
// define named geometrical transformations with names
TGeoTranslation *tr = new TGeoTranslation(0., 0., 45.);
tr->SetName("tr");
// register all used transformations
// create the composite shape based on a Boolean expression
TGeoCompositeShape *cs = new TGeoCompositeShape("mir", "sph:tr * bx");
TGeoVolume *vol = new TGeoVolume("COMP2",cs);
top->AddNode(vol,1);
top->Draw();
MakePicture();
c->cd(2);
TPaveText *pt = new TPaveText(0.01,0.01,0.99,0.99);
TText *text = pt->AddText("TGeoCompositeShape - composite shape class");
pt->AddText("----- Here is an example of boolean intersection operation : A * B");
pt->AddText("----- A == sphere (with inner radius non-zero), B == box");
pt->AddText(" ");
pt->SetAllWith("-----","color",4);
pt->SetAllWith("-----","font",72);
pt->SetAllWith("-----","size",0.04);
pt->SetTextSize(0.044);
pt->Draw();
c->cd(1);
}
void s_difference()
{
gROOT->GetListOfCanvases()->Delete();
TCanvas *c = new TCanvas("composite shape", "Difference boolean operation", 700, 1000);
c->Divide(1,2,0,0);
c->cd(2);
gPad->SetPad(0,0,1,0.4);
c->cd(1);
gPad->SetPad(0,0.4,1,1);
if (gGeoManager) delete gGeoManager;
new TGeoManager("xtru", "poza12");
TGeoMaterial *mat = new TGeoMaterial("Al", 26.98,13,2.7);
TGeoMedium *med = new TGeoMedium("MED",1,mat);
TGeoVolume *top = gGeoManager->MakeBox("TOP",med,100,100,100);
// define shape components with names
TGeoTorus *tor = new TGeoTorus("tor", 45., 15., 20., 45., 145.);
TGeoSphere *sph = new TGeoSphere("sph", 20., 45., 0., 180., 0., 270.);
// create the composite shape based on a Boolean expression
TGeoCompositeShape *cs = new TGeoCompositeShape("mir", "sph - tor");
TGeoVolume *vol = new TGeoVolume("COMP3",cs);
top->AddNode(vol,1);
top->Draw();
MakePicture();
c->cd(2);
TPaveText *pt = new TPaveText(.01, .01, .99, .99);
TText *text = pt->AddText("TGeoCompositeShape - composite shape class");
pt->AddText("----- It's an example of boolean difference: A - B");
pt->AddText("----- A == part of sphere (0-180, 0-270), B == partial torus (45-145)");
pt->AddText(" ");
pt->SetAllWith("-----","color",4);
pt->SetAllWith("-----","font",72);
pt->SetAllWith("-----","size",0.04);
pt->SetTextSize(0.044);
pt->Draw();
c->cd(1);
}
void complex_1()
{
gROOT->GetListOfCanvases()->Delete();
TCanvas *c = new TCanvas("composite shape", "A * B - C", 700, 1000);
c->Divide(1,2,0,0);
c->cd(2);
gPad->SetPad(0,0,1,0.4);
c->cd(1);
gPad->SetPad(0,0.4,1,1);
if (gGeoManager) delete gGeoManager;
new TGeoManager("xtru", "poza12");
TGeoMaterial *mat = new TGeoMaterial("Al", 26.98,13,2.7);
TGeoMedium *med = new TGeoMedium("MED",1,mat);
TGeoVolume *top = gGeoManager->MakeBox("TOP",med,100,100,100);
// define shape components with names
TGeoBBox *box = new TGeoBBox("box", 20., 20., 20.);
TGeoBBox *box1 = new TGeoBBox("box1", 5., 5., 5.);
TGeoSphere *sph = new TGeoSphere("sph", 5., 25.);
TGeoSphere *sph1 = new TGeoSphere("sph1", 1., 15.);
// create the composite shape based on a Boolean expression
TGeoTranslation *tr = new TGeoTranslation(0., 30., 0.);
TGeoTranslation *tr1 = new TGeoTranslation(0., 40., 0.);
TGeoTranslation *tr2 = new TGeoTranslation(0., 30., 0.);
TGeoTranslation *tr3 = new TGeoTranslation(0., 30., 0.);
tr->SetName("tr");
tr1->SetName("tr1");
tr2->SetName("tr2");
tr3->SetName("tr3");
// register all used transformations
TGeoCompositeShape *cs = new TGeoCompositeShape("mir", "(sph * box) + (sph1:tr - box1:tr1)");
TGeoVolume *vol = new TGeoVolume("COMP4",cs);
// vol->SetLineColor(randomColor());
top->AddNode(vol,1);
top->Draw();
MakePicture();
c->cd(2);
TPaveText *pt = new TPaveText(0.01,0.01,0.99,0.99);
TText *text = pt->AddText("TGeoCompositeShape - composite shape class");
pt->AddText("----- (sphere * box) + (sphere - box) ");
pt->AddText(" ");
pt->SetAllWith("-----","color",4);
pt->SetAllWith("-----","font",72);
pt->SetAllWith("-----","size",0.04);
pt->SetTextSize(0.044);
pt->Draw();
c->cd(1);
}
//______________________________________________________________________________
void AddText(TPaveText *pave, const char *datamember, Double_t value, const char *comment)
{
char line[128];
for (Int_t i=0; i<128; i++) line[i] = ' ';
memcpy(&line[0], datamember, strlen(datamember));
line[10] = '=';
char number[20];
sprintf(number, "%5.2f", value);
memcpy(&line[12], number, strlen(number));
line[26] = '=';
line[27] = '>';
sprintf(&line[30], "%s",comment);
TText *text = pave->AddText(line);
}
//______________________________________________________________________________
void AddText(TPaveText *pave, const char *datamember, Int_t value, const char *comment)
{
char line[128];
for (Int_t i=0; i<128; i++) line[i] = ' ';
memcpy(&line[0], datamember, strlen(datamember));
line[10] = '=';
char number[20];
sprintf(number, "%5i", value);
memcpy(&line[12], number, strlen(number));
line[26] = '=';
line[27] = '>';
sprintf(&line[30], "%s",comment);
TText *text = pave->AddText(line);
}
//______________________________________________________________________________
void AddText(TPaveText *pave, TObject *pf, Int_t iaxis)
{
char line[128];
if (!pave || !pf) return;
for (Int_t i=0; i<128; i++) line[i] = ' ';
TGeoVolume *volume = finder->GetVolume();
TGeoShape *sh = volume->GetShape();
sprintf(line, "Division of %s on axis %d (%s)", volume->GetName(), iaxis,sh->GetAxisName(iaxis));
TText *text = pave->AddText(line);
AddText(pave, "fNdiv",finder->GetNdiv(),"number of divisions");
AddText(pave, "fStart",finder->GetStart(),"start divisioning position");
AddText(pave, "fStep",finder->GetStep(),"division step");
}
//______________________________________________________________________________
void raytrace() {
if (!gGeoManager) return;
if (!painter) return;
painter->SetRaytracing(raytracing);
if (!gPad) return;
gPad->Modified();
gPad->Update();
}
//______________________________________________________________________________
void help() {
//
new TCanvas("chelp","Help to run demos",200,10,700,600);
TPaveText* welcome = new TPaveText(.1,.8,.9,.97);
welcome->AddText("Welcome to the new geometry package");
welcome->SetTextFont(32);
welcome->SetTextColor(4);
welcome->SetFillColor(24);
welcome->Draw();
TPaveText* hdemo = new TPaveText(.05,.05,.95,.7);
hdemo->SetTextAlign(12);
hdemo->SetTextFont(52);
hdemo->AddText("- Demo for building TGeo composite shapes");
hdemo->AddText(" ");
hdemo->SetAllWith("....","color",2);
hdemo->SetAllWith("....","font",72);
hdemo->SetAllWith("....","size",0.03);
hdemo->Draw();
}
Author
Andrei Gheata

Definition in file csgdemo.C.