wifi/statistics.cpp

   1 /***************************************************************************
   2                           statistics.cpp  -  description
   3                              -------------------
   4     begin                : Mon Aug 19 2002
   5     copyright            : (C) 2002 by Stefan Winter
   6     email                : mail@stefan-winter.de
   7  ***************************************************************************/
   8
   9 /***************************************************************************
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  ***************************************************************************/
  17
  18 #include <QWidget>
  19 #include <QPainter>
  20 #include <QPolygon>
  21 #include <QPaintEvent>
  22 #include <klocale.h>
  23 #include "statistics.h"
  24 #include "interface_wireless.h"
  25 #include "kwifi_settings.h"
  26
  27 Statistics::Statistics ( Interface_wireless * device, QWidget * parent ):QWidget ( parent )
  28 {
  29   this->device = device;
  30 }
  31
  32 int
  33 Statistics::determineTop (  )
  34 {
  35   return ( device->sigLevelMax > device->noiseLevelMax ) ? device->sigLevelMax : device->noiseLevelMax;
  36 }
  37
  38 int
  39 Statistics::determineBottom (  )
  40 {
  41   return ( device->sigLevelMin > device->noiseLevelMin ) ? device->noiseLevelMin : device->sigLevelMin;
  42 }
  43
  44 void
  45 Statistics::paintEvent ( QPaintEvent * )
  46 {
  47   statpainter = new QPainter ( this );
  48   QColor farbe ( 255, 255, 255 );
  49   statpainter->fillRect ( 0, 0, 480, 201, farbe );
  50   QPolygon signal ( 240 );
  51   QPolygon noise ( 240 );
  52
  53   int datarange = determineTop (  ) - determineBottom (  );
  54
  55   // if values are all below 0, this indicates proper dBm values
  56
  57   double scaleRatio;
  58   if ( datarange != 0 )
  59     scaleRatio = 200. / datarange;
  60   else
  61     scaleRatio = 1.;
  62
  63   int i = 0;
  64   bool atLeastOneValid = false;
  65   for ( int j = device->current; j < device->current + MAX_HISTORY; j++ )
  66     {
  67       if ( device->valid[j % MAX_HISTORY] )
  68         {
  69           atLeastOneValid = true;
  70           signal.setPoint ( i, ( i * 2 ),
  71                             200 -
  72                             ( int ) ( ( ( device->sigLevel[j % MAX_HISTORY] +
  73                                           device->sigLevel[( j - 1 ) % MAX_HISTORY] ) / 2 -
  74                                         determineBottom (  ) ) * scaleRatio ) );
  75           noise.setPoint ( i, ( i * 2 ),
  76                            200 -
  77                            ( int ) ( ( ( device->noiseLevel[j % MAX_HISTORY] +
  78                                          device->noiseLevel[( j - 1 ) % MAX_HISTORY] ) / 2 -
  79                                        determineBottom (  ) ) * scaleRatio ) );
  80         }
  81       else
  82         {
  83           signal.setPoint ( i, ( i * 2 ), 200 );
  84           noise.setPoint ( i, ( i * 2 ), 200 );
  85         }
  86       i++;
  87     };
  88   // the above point array is only useful if at least one entry has its
  89   // valid flag set. This fact is determined in the iteration before.
  90   // Only paint the point array if there is one valid entry
  91   if ( atLeastOneValid )
  92     {
  93       if ( KWiFiSettings::self()->showNoiseInStats() )
  94         {
  95           statpainter->setPen ( Qt::red );
  96           statpainter->drawPolyline ( noise );
  97         }
  98       statpainter->setPen ( Qt::blue );
  99       statpainter->drawPolyline ( signal );
 100     }
 101   delete statpainter;
 102 }