CollectOn.C

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void CollectOn()
{
        if ( TVirtualPad::Pad() ) {
                TCanvas *c = TVirtualPad::Pad()->GetCanvas(); ClickCollector *thecollector = ClickCollector::TheCollector();
                c->Connect("ProcessedEvent(Int_t,Int_t,Int_t,TObject*)","ClickCollector",
                                thecollector,
                                "DoCollect(Int_t,Int_t,Int_t,TObject*)");
                cout << " - Start collecting clicks in " << c->GetName() << endl ;      
                
                thecollector->SetMode();
        }
        else 
                cout << " - Cannot collect clicks, there is no current pad !!! " << endl ;       

}

#include <RQ_OBJECT.h>

class ClickCollector 
{
RQ_OBJECT("ClickCollector")

private:
        static ClickCollector *gfCollector;     // the click collector
        
private:    
        Int_t fLastPx, fLastPy;         // to keep track of the last postion of the mouse in the pad
        EEventType fCollectMode;        // type of event needed to collect
        
        TMarker    fMarker;             // Marker attribute used to draw markers

        Bool_t  fIsActive;              // true if collect mode is on
                
private:
        ClickCollector();
  
public:
        ~ClickCollector() {;}
  
        void SetMode(Bool_t mode = true) { fIsActive = mode; }
        void SetMarker(TMarker m) { fMarker = m; }

        // the unique collector
        static ClickCollector * TheCollector(); 
        
        // action to be performed for any events
        void DoCollect(Int_t event, Int_t px, Int_t py, TObject *obj);
};

// set statics
ClickCollector *ClickCollector::gfCollector = 0;

ClickCollector::ClickCollector() : fLastPx(0), fLastPy(0), fCollectMode(kKeyPress), fMarker()
{       
        // set marker style for peaks
        fMarker.SetMarkerStyle(20); fMarker.SetMarkerColor(2); gfCollector = this;
}


ClickCollector * ClickCollector::TheCollector()
{
        if ( gfCollector == NULL ) new ClickCollector(); return gfCollector;
}


void ClickCollector::DoCollect(Int_t event, Int_t px, Int_t py, TObject *obj)
{
        // Collect event.
        // if event = fCollectMode ( = double click by default ) it adds a "click"
        // to the list of clicks and displays a TCross at that position.

        if ( event == kMouseMotion ) { fLastPx = px; fLastPy = py; return; } // keep memory of the last position
        
        if ( event == fCollectMode && fIsActive ) {
                if ( gROOT->GetSelectedPad() ) {
                        fMarker.DrawMarker(gROOT->GetSelectedPad()->AbsPixeltoX(fLastPx),
                        gROOT->GetSelectedPad()->AbsPixeltoY(fLastPy));
                        gROOT->GetSelectedPad()->Update();
                }
        }
}