//************ File MakeEx2a *****************************
rootcint -f ex2aDict.cxx -c example2a.h ex2aLinkDef.h
g++ `root-config --cflags --glibs` -o example2a example2a.cxx ex2aDict.cxx


//************ File ex2aLinkDef.h ************************
#pragma link C++ class MyMainFrame;

//************ File example2a.h **************************

#include <TQObject.h>
#include <RQ_OBJECT.h>

class TGWindow;
class TGMainFrame;
class TRootEmbeddedCanvas;


class MyMainFrame {

RQ_OBJECT("MyMainFrame")

private:
   TGMainFrame         *fMain;
   TRootEmbeddedCanvas *fEcanvas;

public:
   MyMainFrame(const TGWindow *p, UInt_t w, UInt_t h);
   virtual ~MyMainFrame();
   void DoDraw();
};


//************ File example2a.cxx ************************

#include <TROOT.h>
#include <TRandom.h>
#include <TApplication.h>
#include <TGClient.h>
#include <TCanvas.h>
#include <TF1.h>
#include <TGButton.h>
#include <TGFrame.h>
#include <TRootEmbeddedCanvas.h>

#include "example2a.h"


MyMainFrame::MyMainFrame(const TGWindow *p, UInt_t w, UInt_t h)
{
   // Create a main frame
   fMain = new TGMainFrame(p, w, h);

   // Create an embedded canvas and add it to the main frame
   fEcanvas = new TRootEmbeddedCanvas ("Ecanvas", fMain, 200, 200);
   fMain->AddFrame(fEcanvas, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 10, 10, 10, 1));

   // Create a horizontal frame containing two buttons
   TGHorizontalFrame *hframe = new TGHorizontalFrame(fMain, 200, 40);
   TGTextButton *draw = new TGTextButton(hframe, "&Draw");
   draw->Connect("Clicked()", "MyMainFrame", this, "DoDraw()");
   hframe->AddFrame(draw, new TGLayoutHints(kLHintsCenterX, 5, 5, 3, 4));
   TGTextButton *exit = new TGTextButton(hframe, "&Exit ","gApplication->Terminate()");
   hframe->AddFrame(exit, new TGLayoutHints(kLHintsCenterX, 5, 5, 3, 4));
   fMain->AddFrame(hframe, new TGLayoutHints(kLHintsCenterX, 2, 2, 2, 2));

   // Set a name to the main frame
   fMain->SetWindowName("Simple Example");
   fMain->MapSubwindows();

   // Initialize the layout algorithm via Resize()
   fMain->Resize(fMain->GetDefaultSize());

   // Map main frame
   fMain->MapWindow();
}

MyMainFrame::~MyMainFrame()
{
   // Clean up all widgets, frames and layouthints that were used

   fMain->Cleanup();
   delete fMain;
}

void MyMainFrame::DoDraw()
{
   // Draw a function
   static TF1 *f1 = 0;
   if (f1) delete f1;
   f1 = new TF1("f1", "sin(x)/x", 0, gRandom->Rndm()*10);
   f1->SetFillColor(19);
   f1->SetFillStyle(1);
   f1->SetLineWidth(3);
   f1->Draw();
   TCanvas *canvas = fEcanvas->GetCanvas();
   canvas->cd();
   canvas->Update();
}


void example()
{
   // Popup the GUI...

   new MyMainFrame(gClient->GetRoot(), 400, 500);
}


int main(int argc, char **argv)
{
   // Main program. Initialize application environment.

   TApplication theApp("App", &argc, argv);

   example();

   theApp.Run();

   return 0;
}