C++ TVirtualPad类代码示例

//________________________________________________________
TVirtualPad* GFHistManager::GetPad(Int_t layer, Int_t histNum)
{
  // pointer to pad where hists from layer/histNum are painted in
  // callable after draw!
    
  Int_t totHistsYet = 0;
  Int_t numHists = 0;
  TCanvas *can = NULL;

  for (Int_t numCan = 0; ; ++numCan) {
    can = this->GetCanvas(layer, numCan);
    if (!can) break;
    numHists = TMath::Max(1, this->NumberOfSubPadsOf(can));
    totHistsYet += numHists;
    if (totHistsYet > histNum) {
      totHistsYet -= numHists;
      break;
    }
  }

  TVirtualPad *result = NULL;
  if (can) {
    TVirtualPad *oldPad = gPad;
    if (numHists <= 1) can->cd(0); // one hist per canvas: no pads!
    else can->cd(histNum - totHistsYet + 1);
    result = gPad;
    oldPad->cd();
  }

  return result;
}

//_______________________________________________________________________________________
void MakeFourView(TVirtualPad *pad=0)
{
//  Creates 4 pads view of the pad (or qPad)
//   ------------------------------
//   |              |             |
//   |              |             |
//   |              |             |
//   |    Front     |   Top       |
//   |    view      |   view      |
//   |              |             |
//   |              |             |
//   |              |             |
//   ---------------+-------------
//   |              |             |
//   |              |             |
//   |              |             |
//   |    Side      |  Spacial    |
//   |    view      |   view      |
//   |              |             |
//   |              |             |
//   |              |             |
//   ------------------------------
// begin_html  <P ALIGN=CENTER> <IMG SRC="gif/FourStarView.gif" ></P> end_html
//
  TVirtualPad *thisPad = pad;
  if (!thisPad) thisPad = qPad();
  TView *view = 0; 
  TList *thisPrimitives = 0; 
  if (thisPad && (thisPrimitives = thisPad->GetListOfPrimitives()) && (view =  thisPad->GetView()) ) 
  {
    Double_t min[3],max[3];
    view->GetRange(min,max);
    Int_t system = view->GetSystem();
    TCanvas *c = new TCanvas(" 4 views", thisPad->GetTitle(),600,600);
    c->Divide(2,2);
    TIter *next=  new TIter(thisPrimitives);
    for (int i =1; i <= 4; i++) {
      c->cd(i);
      TList *newPrimitives = qPad()->GetListOfPrimitives();
      TObject *obj = 0;
      while (obj = next->Next()) newPrimitives->Add(obj);
      TView *newView = new TView(system);
      newView->SetRange(min,max);
      next->Reset();
   }
   delete next;
   // set separate view;
   // Fron view
    Int_t j = 1;
    c->cd(j++); FrontView();
    c->cd(j++); TopView();
    c->cd(j++); SideView();
    c->cd(j++); RotateView(-30.0,60.0,0);
    c->Modified();
    c->Update();
  }
}

//_______________________________________________________________________________________
static void SetBackround(Color_t color, TVirtualPad *pad=0)
{
  TVirtualPad *thisPad = pad;
  if (!thisPad) thisPad = qPad();
  if (thisPad)  {
    thisPad->SetFillColor(color);
    thisPad->Modified();
    thisPad->Update();
  }
}

void DynamicExec()
{
   // Example of function called when a mouse event occurs in a pad.
   // When moving the mouse in the canvas, a second canvas shows the
   // projection along X of the bin corresponding to the Y position
   // of the mouse. The resulting histogram is fitted with a gaussian.
   // A "dynamic" line shows the current bin position in Y.
   // This more elaborated example can be used as a starting point
   // to develop more powerful interactive applications exploiting CINT
   // as a development engine.
   //
   // Author:  Rene Brun
   
   TObject *select = gPad->GetSelected();
   if(!select) return;
   if (!select->InheritsFrom("TH2")) {gPad->SetUniqueID(0); return;}
   TH2 *h = (TH2*)select;
   gPad->GetCanvas()->FeedbackMode(kTRUE);

   //erase old position and draw a line at current position
   int pyold = gPad->GetUniqueID();
   int px = gPad->GetEventX();
   int py = gPad->GetEventY();
   float uxmin = gPad->GetUxmin();
   float uxmax = gPad->GetUxmax();
   int pxmin = gPad->XtoAbsPixel(uxmin);
   int pxmax = gPad->XtoAbsPixel(uxmax);
   if(pyold) gVirtualX->DrawLine(pxmin,pyold,pxmax,pyold);
   gVirtualX->DrawLine(pxmin,py,pxmax,py);
   gPad->SetUniqueID(py);
   Float_t upy = gPad->AbsPixeltoY(py);
   Float_t y = gPad->PadtoY(upy);

   //create or set the new canvas c2
   TVirtualPad *padsav = gPad;
   TCanvas *c2 = (TCanvas*)gROOT->GetListOfCanvases()->FindObject("c2");
   if(c2) delete c2->GetPrimitive("Projection");
   else   c2 = new TCanvas("c2","Projection Canvas",710,10,700,500);
   c2->SetGrid();
   c2->cd();

   //draw slice corresponding to mouse position
   Int_t biny = h->GetYaxis()->FindBin(y);
   TH1D *hp = h->ProjectionX("",biny,biny);
   hp->SetFillColor(38);
   char title[80];
   sprintf(title,"Projection of biny=%d",biny);
   hp->SetName("Projection");
   hp->SetTitle(title);
   hp->Fit("gaus","ql");
   hp->GetFunction("gaus")->SetLineColor(kRed);
   hp->GetFunction("gaus")->SetLineWidth(6);
   c2->Update();
   padsav->cd();
}

TCanvas* pHitSpecPos( )
{
  TCanvas* c = new TCanvas("cHitSpecPos","cHitSpecPos",1000,1100);
  c->Divide(2,2);
  TVirtualPad* p; TH2D *h;
  TText t; t.SetTextColor(4);

  p =c->cd(1); p->SetLogy(); p->SetGrid(1,0);
  h = (TH2D*)gROOT->FindObject("hHitSpec_PtVsPhi_BarMinus"); 
  h->GetYaxis()->SetRange(4,33);
  h->DrawCopy("box");
  t.DrawTextNDC(0.17,0.15, "BARREL MU MINUS");

  p =c->cd(2); p->SetLogy(); p->SetGrid(1,0);
  h = (TH2D*)gROOT->FindObject("hHitSpec_PtVsPhi_BarPlus"); 
  h->GetYaxis()->SetRange(4,32);
  h->DrawCopy("box");
  t.DrawTextNDC(0.17,0.15, "BARREL MU PLUS");

  p =c->cd(3); p->SetLogy(); p->SetGrid(1,0);
  h = (TH2D*)gROOT->FindObject("hHitSpec_PtVsPhi_EndMinus"); 
  h->GetYaxis()->SetRange(4,32);
  h->DrawCopy("box");
  t.DrawTextNDC(0.17,0.15, "ENDCAP MU MINUS");

  p =c->cd(4); p->SetLogy(); p->SetGrid(1,0);
  h = (TH2D*)gROOT->FindObject("hHitSpec_PtVsPhi_EndPlus"); 
  h->GetYaxis()->SetRange(4,32);
  h->DrawCopy("box");
  t.DrawTextNDC(0.17,0.15, "ENDCAP MU PLUS");

  return c;
}

void makeimage(const char *MacroName, const char *ImageName, const char *OutDir, bool cp)
{
   gROOT->ProcessLine(Form(".x %s",MacroName));
   if (cp) gSystem->Exec(TString::Format("cp %s %s/macros", MacroName, OutDir));

   TIter iCanvas(gROOT->GetListOfCanvases());
   TVirtualPad* pad = 0;

   while ((pad = (TVirtualPad*) iCanvas())) {
      pad->SaveAs(TString::Format("%s/html/%s",OutDir,ImageName));
   }
}

void plotTrk() {
  gStyle->SetOptStat(0);
  gStyle->SetOptTitle(1);
  char c[50];
  c1->Clear();  
  c1->Divide(2,3); 
  for(int hid=0; hid<6; hid++){
    TVirtualPad* pad = c1->cd(hid+1); 
    pad->SetLogy(lTrkHist[hid]);
    double xmin, xmax, ymin=0.0, ymax=0.0;
    if(lTrkHist[hid]==1) ymin=0.1;
    for(int quad=0; quad<kFgtNumQuads; quad++){
      sprintf(c,"Quad%1s-%s",cquad[quad],cTrkHist[hid]);
      //printf("Getting %s\n",c);
      TH1F *h = histTrk[quad][hid] = (TH1F*)file->Get(c);
      xmin=h->GetXaxis()->GetXmin();
      xmax=h->GetXaxis()->GetXmax();
      double m=h->GetMaximum();
      if(ymax<m) ymax=m;
      //printf("quad=%d max=%6.1f ymax=%6.1f xmin=%6.1f xmax=%6.1f\n",quad,m,ymax,xmin,xmax);
    }
    ymax*=1.2; if(lTrkHist[hid]==1){ymax*=20.0;}
    sprintf(c,"%s",cTrkHist[hid]);
    TH2F *frame = new TH2F(c,c,1,xmin,xmax,1,ymin,ymax); frame->SetStats(0); frame->Draw();
    for(int quad=0; quad<kFgtNumQuads; quad++){
      TH1F *h=histTrk[quad][hid];
      h->SetLineColor(colorQuad[quad]); h->SetLineWidth(3); 
      if(hid<5){
	h->Draw("SAME");  
	float mean=h->GetMean();
	if(hid==1 || hid==4) {sprintf(c,"%s mean=%6.4f",cquad[quad],mean);}
	else                 {sprintf(c,"%s mean=%6.2f",cquad[quad],mean);}
      }else{
	h->SetMarkerColor(colorQuad[quad]); h->SetMarkerStyle(20); h->SetMarkerSize(1);
	h->Draw("SAME PL");
	sprintf(c,"Quad%s",cquad[quad]);
      }
      TText *t1;
      float x1= 0.2, x2= 0.55;
      float y1=0.8 - 0.07*quad;
      float y2=0.8 - 0.07*(quad-2);
      if(quad<2) { t1 = new TText(x1,y1,c); }
      else       { t1 = new TText(x2,y2,c); }
      t1->SetNDC();
      t1->SetTextSize(0.06); 
      t1->SetTextColor(colorQuad[quad]); 
      t1->Draw();
    }
  }
  c1->Update();
  save("trk");
}

//#endif
void DrawInPad(TVirtualPad* p,
               Int_t sub,
               TH1* h,
               Bool_t logy=false)
{
  TVirtualPad* pp = p->cd(sub);
  pp->SetRightMargin(0.02);
  if (logy) pp->SetLogy();
  TH1* copy = h->DrawCopy("hist");
  copy->GetXaxis()->SetLabelSize(0.13);
  copy->GetYaxis()->SetLabelSize(0.08);
  copy->SetDirectory(0);
}

void splithist(double ratio=0.2){
  TVirtualPad* pmain = TVirtualPad::Pad();
  
  double h = 1. - pmain->GetTopMargin() - pmain->GetBottomMargin();

  double xlow = 0.; //gStyle->GetPadLeftMargin();
  double xhigh = 1.; // - gStyle->GetPadRightMargin();

  double ytop = 1.; //- gStyle->GetPadTopMargin();
  double ybot = 0.; //gStyle->GetPadBottomMargin();
  double ymid = pmain->GetBottomMargin() + ratio * h; //ybot + ratio * (ytop-ybot);
  

  double yp1bot = ymid;
  double yp2top = ymid;

  TPad* p1 = new TPad(TString(pmain->GetName()) + "_1", pmain->GetTitle(),
		      xlow, yp1bot, xhigh, ytop);
  p1->SetNumber(1);
  TPad* p2 = new TPad(TString(pmain->GetName()) + "_2", pmain->GetTitle(), 
		      xlow, ybot, xhigh, yp2top);
  p2->SetNumber(2);
  p1->SetFillStyle(4000);
  p2->SetFillStyle(4000);

  double p1h = ytop - yp1bot;
  double p2h = yp2top - ybot;
  

/*
  p1->SetTopMargin(pmain->GetTopMargin()/p1h);
  p1->SetBottomMargin((ymid-yp1bot)/p1h);
  p1->SetLeftMargin(pmain->GetLeftMargin());
  p1->SetRightMargin(pmain->GetRightMargin());
  
  p2->SetTopMargin((ymid-yp2top)/p2h);
  p2->SetBottomMargin(pmain->GetBottomMargin()/p2h);
  p2->SetLeftMargin(pmain->GetLeftMargin());
  p2->SetRightMargin(pmain->GetRightMargin());
*/
    p1->SetTopMargin(0.11);
    p1->SetBottomMargin(0.);
    p1->SetRightMargin(0.02);
 
    p2->SetTopMargin(0.);
    p2->SetBottomMargin(0.3);
    p2->SetRightMargin(0.02);



  p2->Draw();
  p1->Draw();
  pmain->Modified();

  p1->cd();
}

//_______________________________________________________________________________________
static void Inscrease3DScale()
{
  TVirtualPad *thisPad = qPad();
  if (thisPad) {
    TView *view = thisPad->GetView(); 
    if (!view) return;
    Double_t min[3],max[3];
    view->GetRange(min,max);
    int i;
    for (i=0;i<3; i++) {max[i] *= 0.8; min[i]=max[i]*0.1;}
    view->SetRange(min,max);
    thisPad->Modified();
    thisPad->Update();
  }
}

//_______________________________________________________________________________________
static void Centered3DImages()
{
  // This macro prints out the sizes of the sekected 3d pad
  TVirtualPad *thisPad = qPad();
  if (thisPad) {
    TView *view = thisPad->GetView(); 
    if (!view) return;
    Double_t min[3],max[3];
    view->GetRange(min,max);
    int i;
    for (i=0;i<3; i++) min[i]=-max[i];
    view->SetRange(min,max);
    thisPad->Modified();
    thisPad->Update();
 }
}

void exec2()
{

   if (!gPad) {
      Error("exec2", "gPad is null, you are not supposed to run this macro");
      return;
   }


   TObject *select = gPad->GetSelected();
   if(!select) return;
   if (!select->InheritsFrom(TH2::Class())) {gPad->SetUniqueID(0); return;}
   gPad->GetCanvas()->FeedbackMode(kTRUE);

   //erase old position and draw a line at current position
   int pyold = gPad->GetUniqueID();
   int px = gPad->GetEventX();
   int py = gPad->GetEventY();
   float uxmin = gPad->GetUxmin();
   float uxmax = gPad->GetUxmax();
   int pxmin = gPad->XtoAbsPixel(uxmin);
   int pxmax = gPad->XtoAbsPixel(uxmax);
   if(pyold) gVirtualX->DrawLine(pxmin,pyold,pxmax,pyold);
   gVirtualX->DrawLine(pxmin,py,pxmax,py);
   gPad->SetUniqueID(py);
   Float_t upy = gPad->AbsPixeltoY(py);
   Float_t y = gPad->PadtoY(upy);

   //create or set the new canvas c2
   TVirtualPad *padsav = gPad;
   TCanvas *c2 = (TCanvas*)gROOT->GetListOfCanvases()->FindObject("c2");
   if(c2) delete c2->GetPrimitive("Projection");
   else   c2 = new TCanvas("c2");
   c2->cd();

   //draw slice corresponding to mouse position
   TH2 *h = (TH2*)select;
   Int_t biny = h->GetYaxis()->FindBin(y);
   TH1D *hp = h->ProjectionX("",biny,biny);
   char title[80];
   sprintf(title,"Projection of biny=%d",biny);
   hp->SetName("Projection");
   hp->SetTitle(title);
   hp->Fit("gaus","ql");
   c2->Update();
   padsav->cd();
}

//______________________________________________________________________________
void HighlightFragment()
{
  // TODO templates: what and how highlighing
  if (!gPad || !gr) return;

  // not correct
  TVirtualPad *ph = (TVirtualPad *)gPad->FindObject("ph");
  if (!ph) {
    ph = new TPad("ph", "ph", 0.0, 0.2, 1.0, 1.0);
    ph->SetFillColor(kBlue-10);
    ph->Draw();
  }

  Int_t ih = gr->GetHighlightPoint();
  if (ih == -1) return;
  TRsnFragment *frag = group->FragmentAt(ih);
  if (!frag) return;

  TVirtualPad *save = gPad;
  ph->cd();
  TObject *element = frag->FindElement(tagname);
  if (!element) ph->Clear();
  else element->Draw();
  save->cd();
}

void  QtPrintDialog(TVirtualPad *pad = 0) {

   TVirtualPad *pd = pad;
   if (!pd) pd = TPad::Pad(); // ->GetCanvas();
   if (pd) {
      QPrinter p;
      // Open the Qt "Setup Printer" dialog to configure the "QPrinter p" object
      QPrintDialog printDialog(&p);
      if (printDialog.exec() == QDialog::Accepted) {
         Int_t id = pd->GetPixmapID();
         QPixmap *pix = (QPixmap *)(TGQt::iwid(id));
         QPainter pnt(&p);
         pnt.drawPixmap(0,0,*pix);
      }
   } else {
      printf(" No TCanvas has been selected yet! \n");
   }
}

//_______________________________________________________________________________________
static void AdjustScales()
{
  TVirtualPad *thisPad = qPad();
  if (thisPad) {
    TView *view = thisPad->GetView(); 
    if (!view) return;
    Double_t min[3],max[3];
    view->GetRange(min,max);
    int i;
    Double_t maxSide = 0;
    // Find the largest side
    for (i=0;i<3; i++) maxSide = TMath::Max(maxSide,max[i]-min[i]);
    //Adjust scales:
    for (i=0;i<3; i++) max[i] += maxSide - (max[i]-min[i]);
    view->SetRange(min,max);
    thisPad->Modified();
    thisPad->Update();
 }
}