Canvas.cxx

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#include "EventDisplayBase/Canvas.h"
#include "EventDisplayBase/IoModule.h"

#include "TCanvas.h"
#include "TGFrame.h"
#include "TGLayout.h"
#include "TRootEmbeddedCanvas.h"

#include <iostream>
#include <string>

using namespace evdb;

//......................................................................

Canvas::Canvas(TGMainFrame* mf) 
{
  TGDimension sz;     // Size of the main frame
  
  sz           = mf->GetSize();
  fXsize       = sz.fWidth  - 10; // Leave small margin on left and right 
  fYsize       = sz.fHeight - 58; // Leave small margin on top and bottom
  fAspectRatio = (float)fYsize/(float)fXsize;
  
  // This frame is apparently for holding the buttons on the top; it's
  // not used for anything else.
  fFrame  = new TGCompositeFrame(mf, 60, 60, kHorizontalFrame); 

  // Define a layout for placing the canvas within the frame.
  fLayout = new TGLayoutHints(kLHintsTop | kLHintsLeft | kLHintsExpandX |
                              kLHintsExpandY, 5, 5, 5, 5);
  
  // Careful about clashes with root's naming of canvases. Make a name
  // like "tpcEVDCanvas" using the print tag
  std::string name(this->PrintTag());
  name += "evdb::Canvas";

  // Create the embedded canvas within the main ROOT graphics frame.
  fEmbCanvas = new TRootEmbeddedCanvas(name.c_str(), mf, fXsize, fYsize,
                                       kSunkenFrame, 0);
  mf->AddFrame(fEmbCanvas, fLayout);
  mf->AddFrame(fFrame);
  
  // Extract the graphical Canvas from the embedded canvas.  The user
  // will do most of their drawing in this.
  fCanvas = fEmbCanvas->GetCanvas();
}

//......................................................................

void Canvas::Connect() 
{
  // Make connections for drawing and printing
  IoModule::Instance()->Connect("NewEvent()",
                                "evdb::Canvas",this,"Draw()");
  Printable::AddToListOfPrintables(this->Description(),this);
}

//......................................................................

Canvas::~Canvas() 
{
  IoModule::Instance()->Disconnect(0,this,0);
  delete fEmbCanvas;
  delete fLayout;    
  delete fFrame;
}

//......................................................................

void Canvas::Print(const char* f) { fCanvas->Print(f); }

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