httpgeom.C

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/// \file
/// \ingroup tutorial_http
///  This program creates trivial geometry with several tracks and
///  configure online monitoring of geometry via THttpServer
///  Geometry regularly changed by the program and correspondent changes immediately seen in the browser
///
/// \macro_code
///
/// \author Sergey Linev
 
#include "THttpServer.h"
#include "TGeoManager.h"
#include "TGeoMaterial.h"
#include "TGeoMedium.h"
#include "TGeoVolume.h"
#include "TGeoTrack.h"
#include "TRandom.h"
#include "TTimer.h"
#include "TPad.h"
 
THttpServer *serv = nullptr;
bool draw_geometry = false;
bool set_time_interval = false;
int interval = 2000;
 
void create_geo()
{
   if (gGeoManager) {
      serv->Unregister(gGeoManager);
      delete gGeoManager;
   }
 
   new TGeoManager("world", "the simplest geometry");
 
   if (serv) {
      serv->Register("/", gGeoManager);
      // enable monitoring and
      // specify item to draw when page is opened
      // serv->SetItemField("/","_layout","grid2x2");
      serv->SetItemField("/","_monitoring",Form("%d",interval));
      serv->SetItemField("/","_drawitem","world");
      serv->SetItemField("/","_drawopt","tracks");
   }
 
   auto rnd = gRandom;
 
   TGeoMaterial *mat = new TGeoMaterial("Vacuum",0,0,0);
   mat->SetTransparency(50);
   TGeoMedium   *med = new TGeoMedium("Vacuum",1,mat);
 
   TGeoVolume *top = gGeoManager->MakeBox("Top",med, 10+5*rnd->Rndm(), 10+5*rnd->Rndm(), 10+5*rnd->Rndm());
   gGeoManager->SetTopVolume(top);
   top->SetFillColor(3);
 
   TGeoVolume *in = gGeoManager->MakeBox("In",med, 2.,2.,2.);
   in->SetFillColor(2);
   TGeoCombiTrans *tr = new TGeoCombiTrans("tr");
   double x = -8+16*rnd->Rndm();
   double y = -8+16*rnd->Rndm();
   double z = -8+16*rnd->Rndm();
   tr->SetTranslation (x, y, z);
   tr->RegisterYourself();
   top->AddNode(in, 1, tr);
 
   gGeoManager->CloseGeometry();
 
   if (set_time_interval)
      gGeoManager->SetTminTmax(10, 30); // draw only part of tracks
 
   top->SetLineColor(kMagenta);
   if (rnd->Rndm() < 0.5)
      in->SetLineColor(kGreen);
   else
      in->SetLineColor(kBlack);
 
   for (int j = 0; j < 50; j++) {
      Int_t track_index = gGeoManager->AddTrack(2,22);
      auto track = gGeoManager->GetTrack(track_index);
      if (rnd->Rndm() < 0.5)
         track->SetLineColor(kRed);
      else
         track->SetLineColor(kBlue);
      track->SetLineWidth(2);
 
      track->AddPoint(x, y, z, 0);
      double x1 = -10 + 20*rnd->Rndm();
      double y1 = -10 + 20*rnd->Rndm();
      double z1 = -10 + 20*rnd->Rndm();
      if (set_time_interval) {
         for (int np = 1; np < 40; np++)
            track->AddPoint(x + (x1-x)/40.*np, y + (y1-y)/40.*np, z + (z1-z)/40*np, np);
 
         // make endmarker visible
         track->SetMarkerColor(kGreen);
         track->SetMarkerSize(1);
         track->SetMarkerStyle(8);
      } else {
         track->AddPoint(x1, y1, z1, 0);
      }
   }
 
   if (draw_geometry) {
      // add "showtop" option to display top volume in JSROOT
      // gGeoManager->SetTopVisible();
 
      top->Draw();
      gGeoManager->DrawTracks();
      gPad->Modified();
      gPad->Update();
   }
}
 
 
void httpgeom(bool draw = false, bool tm = false)
{
   draw_geometry = draw;
   set_time_interval = tm;
 
   serv = new THttpServer("http:8090");
 
   TTimer *timer = new TTimer("create_geo()", interval);
   timer->TurnOn();
}