Scrolling data with spectrum

#ifndef __CINT__  // includes in case of compilation
#include "TBenchmark.h"
#include "TCanvas.h"
#include "TH1.h"
#include "VManagerFrameL.h"
#include "FrameL.h"
#include "VFrDataBase.h"
#include "Frv.h"
#endif

void scrollspectrum()
{
// This simple example opens a demo frame channel using a metadatabase,
// plots a vector and it's spectrum.
// The vector is scrolled 1 s at a time, nvecmax times.
// The extraction of the vector shows that one can select a vector
// without having to think about the frame boundaries.
// The length of the vector is arbitrary and is only limited by the available
// amount of memory.
// It is also shown how to use the FFT from the signal analysis library

TCanvas* c1;
VFrameChannel* fc;

   gBenchmark->Start("scrollspectrum");

   FrVect* frv;

//   Max number of vectors displayed
   Int_t nvecmax = 20;
//   Time step of the scroll
   Double_t tistep = 1;
//   Length of the displayed vector
   Double_t veclength = 4;
//   Start time
   Double_t time = 600000000.1;

// Open a new window (canvas) and split it
   c1 = new TCanvas("c1","c1",1);
   c1->Divide(1,2);
   c1->cd(2);
   
// Open a frame channel
   fc = new VFrameChannel("demoDB.root");
   
// Get the first vector
   frv = fc->GetVect("adc.MYGO_ADC1",time,veclength);
   Int_t nvec = 0;
   while ( (frv!=0) && (nvec<nvecmax) ) {
      nvec++;
      printf("nvect = %d, time = %fn",nvec,time);

// Draws the vector in the first pad
      c1->cd(1);      // go to the first pad
      gVM->Draw(frv);
      
// Calculates the spectrum
      FrvRFFT* fft;
      fft = FrvRFFTFor(0,frv);

// Draws the spectrum in the second pad
      c1->cd(2);      // go to the second pad
      gVM->Draw(fft->amplitude);
      gPad->SetLogx(1);
      gPad->SetLogy(1);
      
// Update the canvas
      c1->cd();
      gPad->Update();

// Release the various variables allocated
      FrVectFree(frv);
      FrvRFFTFree(fft);
      
      time += tistep;
      frv = fc->GetVect("adc.MYGO_ADC1",time,veclength); // Get the next vector
   }

   gBenchmark->Show("scrollspectrum");

// Do some garbage collection
   if (frv) FrVectFree(frv);
   delete fc;
}
  

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