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/Go4ConditionsBase/TGo4LabelPainter.cxx

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//---------------------------------------------------------------
//        Go4 Release Package v2.10-5 (build 21005) 
//                      03-Nov-2005
//---------------------------------------------------------------
//       The GSI Online Offline Object Oriented (Go4) Project
//       Experiment Data Processing at DVEE department, GSI
//---------------------------------------------------------------
//
//Copyright (C) 2000- Gesellschaft f. Schwerionenforschung, GSI
//                    Planckstr. 1, 64291 Darmstadt, Germany
//Contact:            http://go4.gsi.de
//----------------------------------------------------------------
//This software can be used under the license agreements as stated
//in Go4License.txt file which is part of the distribution.
//----------------------------------------------------------------
#include "TGo4LabelPainter.h"

#include "TROOT.h"
#include "TVirtualPad.h"

TGo4LabelPainter::TGo4LabelPainter(const Text_t * name, const Text_t * title)
: TNamed(name, title), fxLabel(0),fdX0(0),fdY0(0),fbIsLabStreamed(kFALSE)
{
InitAttributes();
}

TGo4LabelPainter::TGo4LabelPainter(const Text_t * name)
: TNamed(name, "Go4 LabelPainter"), fxLabel(0),fdX0(0),fdY0(0),fbIsLabStreamed(kFALSE)
{
InitAttributes();
}

TGo4LabelPainter::TGo4LabelPainter()
: TNamed(), fxLabel(0),fdX0(0),fdY0(0),fbIsLabStreamed(kTRUE)
{
InitAttributes();
}

void TGo4LabelPainter::InitAttributes()
{
fdWidth=0.25;
fdHeight=0.22;
SetCaption("Empty label");
SetTextAlign(12); // left and central aligned
//SetTextSize(0.03); // % of pad height
SetTextSize(0); // this will let root scale fontsize depending on label frame
SetTextFont(102); // proportional font for alignment of equations
SetTextColor(GetLineColor());
}

TGo4LabelPainter::~TGo4LabelPainter()
{
   gROOT->GetListOfCleanups()->Remove(fxLabel);
   delete fxLabel;
}




void TGo4LabelPainter::PaintLabel(Option_t* opt)
{
if(gPad==0) return;
if(!CheckLabel())
   {
      // label was deleted by us or by root:
      if(fdX0==0)
        fdX0=(gPad->GetUxmax()-gPad->GetUxmin())/2; // default: place at x center
      if(fdY0==0)
        fdY0=(gPad->GetUymax()-gPad->GetUymin())/2; // default: place at y center
      fxLabel=CreateCurrentLabel(fdX0,fdY0);
      gROOT->GetListOfCleanups()->Add(fxLabel);
      fxLabel->AppendPad(opt); // only append to pad if not already there
   }
else
   {
      // label is exisiting:
      if (gPad->GetListOfPrimitives()->FindObject(fxLabel)==0)
         fxLabel->AppendPad(opt); // label was cleared from pad, we redraw it
      fxLabel->SetLineColor(GetLineColor());
      fxLabel->Clear(); // remove old text lines
   }
fxLabel->AddText(fxCaption.Data());
fxLabel->AddText(" "); // dummy for automatic position of next line
fxLabel->AddLine(0,0,0,0);
}

void TGo4LabelPainter::UnPaintLabel(Option_t* opt)
{
   if(gPad==0) return;
   gPad->GetListOfPrimitives()->Remove(fxLabel);
   // we do not delete label, but restore graphics properties though invisible
   TString option=opt;
   if(option.Contains("reset"))
      {
         // case of reset option: discard old label geometry if
         if(CheckLabel())
            {
               gROOT->GetListOfCleanups()->Remove(fxLabel);
               delete fxLabel;
               fxLabel=0;
            }
      }
}

void TGo4LabelPainter::RePaintLabel(Option_t* opt)
{
if(fxLabel) fxLabel->Paint(opt);

}
TGo4Label* TGo4LabelPainter::CreateCurrentLabel(Double_t x, Double_t y)
{
   if(gPad==0) return 0;
   Double_t x0=x;
   Double_t y0=y; // buffer external variables, since LabelCoords will change them
   Double_t xmax=0;
   Double_t ymax=0;
   LabelCoords(x0,y0,xmax,ymax);
   TGo4Label* label=new TGo4Label(x0,y0,xmax,ymax);
   label->SetOwner(this);
   TAttText::Copy(*label);
   TAttLine::Copy(*label);
   TAttFill::Copy(*label);
   return label;
}

Bool_t TGo4LabelPainter::CheckLabel()
{
if(fbIsLabStreamed && fxLabel!=0)
   {
    // case of label was streamed from file: not yet in cleanup list!
    gROOT->GetListOfCleanups()->Add(fxLabel);
    fxLabel->SetOwner(this);
    fbIsLabStreamed=kFALSE;
    return kTRUE;
   }

if(fxLabel && gROOT->GetListOfCleanups()->FindObject(fxLabel))
   {
      return kTRUE;
   }

else
   {
      fxLabel=0;
      return kFALSE;
   }
}


void TGo4LabelPainter::LabelCoords(Double_t &xmin, Double_t &ymin, Double_t &xmax, Double_t &ymax)
{
   Double_t xpmin =gPad->GetUxmin();
   Double_t xpmax =gPad->GetUxmax();
   Double_t ypmin =gPad->GetUymin();
   Double_t ypmax =gPad->GetUymax(); // this delivers pad coordinates
   Double_t dx=(xpmax-xpmin);
   Double_t dy=(ypmax-ypmin);
   Double_t width=fdWidth*dx;
   Double_t height=fdHeight*dy; // width is in pad coordinates
   xmax=gPad->XtoPad(xmin)+width;
   ymax=gPad->YtoPad(ymin)+height; // calculate label geometry in pad coordinates
   xmax=gPad->PadtoX(xmax);
   ymax=gPad->PadtoY(ymax); // back to axis coordinates for initial pavetext
}

Double_t TGo4LabelPainter::GetLabelXlo()
{
if(fxLabel)
      return fxLabel->GetX1();
else
   return 0;
}

Double_t TGo4LabelPainter::GetLabelYlo()
{
if(fxLabel)
      return fxLabel->GetY1();
else
   return 0;
}

Double_t TGo4LabelPainter::GetLabelXup()
{
if(fxLabel)
   return fxLabel->GetX2();
else
   return 0;
}

Double_t TGo4LabelPainter::GetLabelYup()
{
if(fxLabel)
      return fxLabel->GetY2();
else
   return 0;
}

void TGo4Label::Paint(Option_t* opt)
{
if(gPad==0) return;
if(fxOwner) TPaveText::Paint(opt);
// suppress painting of labels without owner. This case
// happens after insert canvas in go4 (separate cloning
// of lists of primitive members), thus leading to a
// second "ghost label" for markers and conditions
}

void TGo4LabelConnector::Paint(Option_t* opt)
{
if(gPad==0) return;
if(fxOwner) TLine::Paint(opt);
// suppress painting of label connectors without owner. This case
// happens after insert canvas in go4 (separate cloning
// of lists of primitive members), thus leading to a
// second "ghost label connector" for markers
}

ClassImp(TGo4LabelPainter)
ClassImp(TGo4LabelConnector)
ClassImp(TGo4Label)



//----------------------------END OF GO4 SOURCE FILE ---------------------

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