// example.C
#include <TGClient.h>
#include <TCanvas.h>
#include <TF1.h>
#include <TGraph.h>
#include <TRandom.h>
#include <TGButton.h>
#include <TGFrame.h>
#include <TRootEmbeddedCanvas.h>
#include <TTimer.h>

class MyMainFrame : public TGMainFrame {
private:
   Int_t                 fCounter;
   TRootEmbeddedCanvas  *fEcanvas;
   TTimer               *fTimer;
   TGraph               *fGraph;
   TGTextButton         *fDraw;

public:
   MyMainFrame(const TGWindow *p,UInt_t w,UInt_t h);
   virtual ~MyMainFrame();
   void DoDraw();
   Bool_t HandleTimer(TTimer *t);

   ClassDef(MyMainFrame, 0)
};

MyMainFrame *gMyMainFrame;

MyMainFrame::MyMainFrame(const TGWindow *p,UInt_t w,UInt_t h) : TGMainFrame(p,w,h)
{

#ifdef __CINT__
   fTimer = new TTimer(1000);
   fTimer->SetCommand("gMyMainFrame->HandleTimer(0)");
#else
   fTimer = new TTimer(this, 1000);
#endif
   fGraph = new TGraph();
   fCounter = 0;

   // Create canvas widget
   fEcanvas = new TRootEmbeddedCanvas("Ecanvas",this,200,200);
   AddFrame(fEcanvas, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 10,10,10,1));
   // Create a horizontal frame widget with buttons
   TGHorizontalFrame *hframe = new TGHorizontalFrame(this,200,40);
   fDraw = new TGTextButton(hframe, "&Start");
   fDraw->Connect("Clicked()","MyMainFrame",this,"DoDraw()");
   hframe->AddFrame(fDraw, new TGLayoutHints(kLHintsCenterX,5,5,3,4));
   TGTextButton *exit = new TGTextButton(hframe,"&Exit","gApplication->Terminate(0)");
   hframe->AddFrame(exit, new TGLayoutHints(kLHintsCenterX,5,5,3,4));
   AddFrame(hframe, new TGLayoutHints(kLHintsCenterX,2,2,2,2));
   // Set a name to the main frame
   SetWindowName("Simple Example");
   // Map all subwindows of main frame
   MapSubwindows();
   // Initialize the layout algorithm
   Resize(GetDefaultSize());
   // Map main frame
   MapWindow();
}

//______________________________________________________________________________
Bool_t MyMainFrame::HandleTimer(TTimer *t)
{
   // Handle timer event and draws function graphics

   TCanvas *fCanvas = fEcanvas->GetCanvas();
   fGraph->SetPoint(fCounter, fCounter, fCounter*2);
   fCanvas->cd();
   if (fCounter == 0) {
      fCanvas->Clear();
      fGraph->Draw("al");
   }
   fCanvas->Update();
   fCounter++;
   fTimer->Reset();
   if (fCounter >= 50)
      fTimer->TurnOff();
   return kTRUE;
}

void MyMainFrame::DoDraw()
{
   // Reset counter and graph, reset and start timer
   static Bool_t running = kFALSE;

   if (!running) {
      fDraw->SetText("&Stop");
      fTimer->Reset();
      fTimer->TurnOn();
      running = kTRUE;
   }
   else {
      fDraw->SetText("&Start");
      fTimer->Reset();
      fTimer->TurnOff();
      running = kFALSE;
   }
}

MyMainFrame::~MyMainFrame()
{
   // Clean up used widgets: frames, buttons, layouthints
   Cleanup();
}

void timer_example()
{
   // Popup the GUI...
   gMyMainFrame = new MyMainFrame(gClient->GetRoot(),200,200);
}