#include "TApplication.h" 
#include "TGClient.h" 
#include "TCanvas.h" 
#include "TF1.h" 
#include "TRandom.h" 
#include "TGButton.h" 
#include "TRootEmbeddedCanvas.h" 
#include "TH1F.h" 
#include "TFormula.h" 
#include "TTimer.h" 
#include "TGFrame.h" 
#include "TThread.h"

class MyMainFrame : public TGMainFrame { 
private: 
   TRootEmbeddedCanvas *fEcanvas; 
   TRootEmbeddedCanvas *fEcanvas2; 
   static TH1F         *fH1f; 
   TThread             *fThread;
   // canvas used by the static thread method
   static TCanvas      *fC1;
   
public: 
   MyMainFrame(const TGWindow *p, UInt_t w, UInt_t h); 
   virtual ~MyMainFrame() { }

   void     CloseWindow();
   void     DoDraw(); 

   // thread method
   static void *ThreadFunc(void *ptr=0);
   
   ClassDef(MyMainFrame, 0) 
}; 

// initialize the static variables
TH1F *MyMainFrame::fH1f = 0;
TCanvas *MyMainFrame::fC1 = 0;

//______________________________________________________________________ 
MyMainFrame::MyMainFrame(const TGWindow *p,UInt_t w,UInt_t h) 
: TGMainFrame(p,w,h) 
{ 
   // Creates widgets of the example
   SetCleanup(kDeepCleanup);
   fEcanvas = new TRootEmbeddedCanvas ("Ecanvas",this,200,200); 
   AddFrame(fEcanvas, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 
                                        10,10,10,1)); 
   fC1 = fEcanvas->GetCanvas();
   fEcanvas2 = new TRootEmbeddedCanvas ("Ecanvas2",this,200,200); 
   AddFrame(fEcanvas2, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY, 
                                         10,10,10,1));
   TGHorizontalFrame *hframe=new TGHorizontalFrame(this, 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)); 
   AddFrame(hframe,new TGLayoutHints(kLHintsCenterX,2,2,2,2)); 
   // Sets window name and shows the main frame 
   SetWindowName("Simple Example"); 
   MapSubwindows(); 
   Resize(GetDefaultSize()); 
   MapWindow(); 
   // set up the thread
   fThread = new TThread("MyThread", ThreadFunc, (void*)0);
} 

//______________________________________________________________________ 
void MyMainFrame::DoDraw() 
{ 
   // Starts the thread 
   
   if (fThread->GetState() != TThread::kRunningState) {
      fThread->Run();
      fThread->SetCancelAsynchronous();
   }
} 

//______________________________________________________________________________ 
void MyMainFrame::CloseWindow()
{
   // terminate and delete the thread, then quit the application

   fThread->Kill();
   delete fThread;
   gApplication->Terminate();
}

//______________________________________________________________________________ 
void *MyMainFrame::ThreadFunc(void* ptr)
{
   // this method is called by the thread

   fC1->cd(); 
   // create the histogram first
   if (!fH1f) { 
      TFormula *form1 = new TFormula("form1","abs(sin(x)/x)"); 
      TF1 *sqroot = new TF1("sqroot","x*gaus(0) + [3]*form1",0,10); 
      sqroot->SetParameters(10,4,1,20); 
      fH1f = new TH1F("h1f","Test random numbers",100,0,10); 
      fH1f->SetFillColor(45); 
   } 
   fH1f->FillRandom("sqroot",10000); 
   fH1f->Draw();

   // infinite loop updating the histogram
   while (true) {
      if (fH1f) { 
         // locking avoids data loss
         TThread::Lock();
         fH1f->Reset(); 
         fH1f->FillRandom("sqroot",10000); 
         TThread::UnLock();
      } 
      fC1->Modified(); 
      fC1->Update(); 
      // sleep for 10 ms: sleep not necessary, slows things only a bit down
      // because the threads are actually doing nothing, which is eventually
      // very fast ;-)
      TThread::Sleep(0, 10000000);
   }

   return ptr;
}


#ifndef __CINT__ 
//______________________________________________________________________________ 
int main(int argc, char *argv[]) 
{ 
   TApplication theApp( "TestDatePlot", &argc, argv ); 
   
   new MyMainFrame(gClient->GetRoot(), 800, 600); 
   
   theApp.Run(); 
} 
#endif