class MyText {
RQ_OBJECT("MyText")

private:
   int rpx,rpy;
   TText *t;

public:
   MyText() {rpx=0; rpy=0;}
  ~MyText() {}

   void ExecuteText(Int_t event, Int_t px, Int_t py, TObject *sel);
};

void MyText::ExecuteText(Int_t event, Int_t px, Int_t py, TObject *sel)
{
   TCanvas * c = (TCanvas *) gTQSender;
   TPad * pad = (TPad *) c->GetSelectedPad();

   if ( event == kButton1Down) {
      cout << "exiting now"<<endl;
      c->Disconnect();
      delete this;
   } else if ( event == kMouseMotion ) {
      if (!t) {
         t = new TText(pad->AbsPixeltoX(px),pad->AbsPixeltoY(py),"test");
	 t->SetTextSize(0.05);
         t->Draw();
      } else {
         t->SetText(pad->AbsPixeltoX(px),pad->AbsPixeltoY(py),"test");
      }
      pad->Update();
   }
}

void text() {
   // Create a new canvas.
   c1 = new TCanvas("c1","Dynamic Slice Example",10,10,700,500);
   c1->SetFillColor(42);
   c1->SetFrameFillColor(33);
  
   //create a 2-d histogram, fill and draw it
   TH2F *hpxpy  = new TH2F("hpxpy","py vs px",40,-4,4,40,-4,4);
   hpxpy->SetStats(0);
   Double_t px,py;
   for (Int_t i = 0; i < 50000; i++) {
      gRandom->Rannor(px,py);
      hpxpy->Fill(px,py);
   }
   hpxpy->Draw("colz");
   MyText * te = new MyText();
   c1->Connect("ProcessedEvent(Int_t,Int_t,Int_t,TObject*)", "MyText",
   te,"ExecuteText(Int_t,Int_t,Int_t,TObject*)");
}