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")

Bool_t raytracing = kTRUE;

#include "TGeoManager.h"
//______________________________________________________________________________
void csgdemo ()
{
   gSystem->Load("libGeom");
   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()
{
   gGeoManager->GetGeomPainter()->SetRaytracing(kFALSE);
   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);
   gGeoManager->SetTopVolume(top);

   // 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
   tr->RegisterYourself();
   // 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);
   gGeoManager->CloseGeometry();
   gGeoManager->SetNsegments(100);
   top->Draw();
   MakePicture();

   c->cd(2);
   TPaveText *pt = new TPaveText(0.01,0.01,0.99,0.99);
   pt->SetLineColor(1);
   TText *text = pt->AddText("TGeoCompositeShape - composite shape class");
   text->SetTextColor(2);
   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->SetTextAlign(12);
   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);
   gGeoManager->SetTopVolume(top);

   // 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
   tr->RegisterYourself();
   // 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);
   gGeoManager->CloseGeometry();
   gGeoManager->SetNsegments(100);
   top->Draw();
   MakePicture();

   c->cd(2);

   TPaveText *pt = new TPaveText(0.01,0.01,0.99,0.99);

   pt->SetLineColor(1);

   TText *text = pt->AddText("TGeoCompositeShape - composite shape class");

   text->SetTextColor(2);
   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->SetTextAlign(12);
   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);
   gGeoManager->SetTopVolume(top);

   // 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);
   gGeoManager->CloseGeometry();
   gGeoManager->SetNsegments(60);
   top->Draw();
   MakePicture();

   c->cd(2);

   TPaveText *pt = new TPaveText(.01, .01, .99, .99);

   pt->SetLineColor(1);

   TText *text = pt->AddText("TGeoCompositeShape - composite shape class");

   text->SetTextColor(2);

   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->SetTextAlign(12);
   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);
   gGeoManager->SetTopVolume(top);

   // 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
   tr->RegisterYourself();
   tr1->RegisterYourself();
   tr2->RegisterYourself();
   tr3->RegisterYourself();

   TGeoCompositeShape *cs = new TGeoCompositeShape("mir", "(sph * box) + (sph1:tr - box1:tr1)");

   TGeoVolume *vol = new TGeoVolume("COMP4",cs);
//   vol->SetLineColor(randomColor());
   top->AddNode(vol,1);
   gGeoManager->CloseGeometry();
   gGeoManager->SetNsegments(80);
   top->Draw();
   MakePicture();

   c->cd(2);
   TPaveText *pt = new TPaveText(0.01,0.01,0.99,0.99);
   pt->SetLineColor(1);
   TText *text = pt->AddText("TGeoCompositeShape - composite shape class");
   text->SetTextColor(2);
   pt->AddText("----- (sphere * box) + (sphere - box) ");

   pt->AddText(" ");
   pt->SetAllWith("-----","color",4);
   pt->SetAllWith("-----","font",72);
   pt->SetAllWith("-----","size",0.04);
   pt->SetTextAlign(12);
   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);
   text->SetTextAlign(12);
}

//______________________________________________________________________________
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);
   text->SetTextAlign(12);
}

//______________________________________________________________________________
void AddText(TPaveText *pave, TObject *pf, Int_t iaxis)
{
   char line[128];
   TGeoPatternFinder *finder = (TGeoPatternFinder*)pf;
   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);
   text->SetTextColor(3);
   text->SetTextAlign(12);
   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;

   TVirtualGeoPainter *painter = gGeoManager->GetGeomPainter();

   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);

   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();

   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.