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Sourcecode: hamfax version File versions

Spectrum.cpp

// HamFax -- an application for sending and receiving amateur radio facsimiles
// Copyright (C) 2001 Christof Schmitt, DH1CS <cschmitt@users.sourceforge.net>
//  
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//  
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#include "Spectrum.hpp"
#include <qpainter.h>
#include <qpixmap.h>
#include <cmath>

Spectrum::Spectrum(QWidget* parent)
      : QFrame(parent)
{
      setFrameStyle(QFrame::Panel|QFrame::Sunken);
      setMargin(2);
      setFixedSize(128+2*margin(),64+2*margin());
      pixmap=new QPixmap(width()-2*margin(),height()-2*margin());
      QPainter paint(pixmap,this);
      paint.eraseRect(0,0,width(),height());
      paint.flush();
}

void Spectrum::init(void)
{
      for(int i=0; i<64; i++) {
            data[i]=0;
      }
}

void Spectrum::paintEvent(QPaintEvent* e)
{
      QFrame::paintEvent(e);
      bitBlt(this,margin(),margin(),pixmap,0,0,
             width()-2*margin(),height()-2*margin());
}

void Spectrum::samples(int* buffer, int n)
{
      for(int i=0; i<64; i++) {
            data[i]=0;
      }
      for(int i=0; i<n; i++) {
            data[buffer[i]/4]++;
      }
      for(int i=0; i<64; i++) {
            data[i]=data[i]*128.0/n+1;
            data[i]=std::log(data[i])*32.0;
            if(data[i]>127) {
                  data[i]=127;
            }
      }
      QPainter paint(pixmap,this);
      paint.eraseRect(0,0,width(),height());
      paint.setPen(Qt::blue);
      paint.setBrush(Qt::blue);
      for(int i=0; i<64; i++) {
            paint.drawRect(i*2,128-data[i],2,data[i]);
      }
      paint.flush();
      update();
}

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