src/qt/trafficgraphwidget.cpp

   1 // Copyright (c) 2011-2015 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include "trafficgraphwidget.h"
   6 #include "clientmodel.h"
   7
   8 #include <QPainter>
   9 #include <QColor>
  10 #include <QTimer>
  11
  12 #include <cmath>
  13
  14 #define DESIRED_SAMPLES         800
  15
  16 #define XMARGIN                 10
  17 #define YMARGIN                 10
  18
  19 TrafficGraphWidget::TrafficGraphWidget(QWidget *parent) :
  20     QWidget(parent),
  21     timer(0),
  22     fMax(0.0f),
  23     nMins(0),
  24     vSamplesIn(),
  25     vSamplesOut(),
  26     nLastBytesIn(0),
  27     nLastBytesOut(0),
  28     clientModel(0)
  29 {
  30     timer = new QTimer(this);
  31     connect(timer, SIGNAL(timeout()), SLOT(updateRates()));
  32 }
  33
  34 void TrafficGraphWidget::setClientModel(ClientModel *model)
  35 {
  36     clientModel = model;
  37     if(model) {
  38         nLastBytesIn = model->getTotalBytesRecv();
  39         nLastBytesOut = model->getTotalBytesSent();
  40     }
  41 }
  42
  43 int TrafficGraphWidget::getGraphRangeMins() const
  44 {
  45     return nMins;
  46 }
  47
  48 void TrafficGraphWidget::paintPath(QPainterPath &path, QQueue<float> &samples)
  49 {
  50     int sampleCount = samples.size();
  51     if(sampleCount > 0) {
  52         int h = height() - YMARGIN * 2, w = width() - XMARGIN * 2;
  53         int x = XMARGIN + w;
  54         path.moveTo(x, YMARGIN + h);
  55         for(int i = 0; i < sampleCount; ++i) {
  56             x = XMARGIN + w - w * i / DESIRED_SAMPLES;
  57             int y = YMARGIN + h - (int)(h * samples.at(i) / fMax);
  58             path.lineTo(x, y);
  59         }
  60         path.lineTo(x, YMARGIN + h);
  61     }
  62 }
  63
  64 void TrafficGraphWidget::paintEvent(QPaintEvent *)
  65 {
  66     QPainter painter(this);
  67     painter.fillRect(rect(), Qt::black);
  68
  69     if(fMax <= 0.0f) return;
  70
  71     QColor axisCol(Qt::gray);
  72     int h = height() - YMARGIN * 2;
  73     painter.setPen(axisCol);
  74     painter.drawLine(XMARGIN, YMARGIN + h, width() - XMARGIN, YMARGIN + h);
  75
  76     // decide what order of magnitude we are
  77     int base = floor(log10(fMax));
  78     float val = pow(10.0f, base);
  79
  80     const QString units     = tr("KB/s");
  81     const float yMarginText = 2.0;
  82
  83     // draw lines
  84     painter.setPen(axisCol);
  85     painter.drawText(XMARGIN, YMARGIN + h - h * val / fMax-yMarginText, QString("%1 %2").arg(val).arg(units));
  86     for(float y = val; y < fMax; y += val) {
  87         int yy = YMARGIN + h - h * y / fMax;
  88         painter.drawLine(XMARGIN, yy, width() - XMARGIN, yy);
  89     }
  90     // if we drew 3 or fewer lines, break them up at the next lower order of magnitude
  91     if(fMax / val <= 3.0f) {
  92         axisCol = axisCol.darker();
  93         val = pow(10.0f, base - 1);
  94         painter.setPen(axisCol);
  95         painter.drawText(XMARGIN, YMARGIN + h - h * val / fMax-yMarginText, QString("%1 %2").arg(val).arg(units));
  96         int count = 1;
  97         for(float y = val; y < fMax; y += val, count++) {
  98             // don't overwrite lines drawn above
  99             if(count % 10 == 0)
 100                 continue;
 101             int yy = YMARGIN + h - h * y / fMax;
 102             painter.drawLine(XMARGIN, yy, width() - XMARGIN, yy);
 103         }
 104     }
 105
 106     if(!vSamplesIn.empty()) {
 107         QPainterPath p;
 108         paintPath(p, vSamplesIn);
 109         painter.fillPath(p, QColor(0, 255, 0, 128));
 110         painter.setPen(Qt::green);
 111         painter.drawPath(p);
 112     }
 113     if(!vSamplesOut.empty()) {
 114         QPainterPath p;
 115         paintPath(p, vSamplesOut);
 116         painter.fillPath(p, QColor(255, 0, 0, 128));
 117         painter.setPen(Qt::red);
 118         painter.drawPath(p);
 119     }
 120 }
 121
 122 void TrafficGraphWidget::updateRates()
 123 {
 124     if(!clientModel) return;
 125
 126     quint64 bytesIn = clientModel->getTotalBytesRecv(),
 127             bytesOut = clientModel->getTotalBytesSent();
 128     float inRate = (bytesIn - nLastBytesIn) / 1024.0f * 1000 / timer->interval();
 129     float outRate = (bytesOut - nLastBytesOut) / 1024.0f * 1000 / timer->interval();
 130     vSamplesIn.push_front(inRate);
 131     vSamplesOut.push_front(outRate);
 132     nLastBytesIn = bytesIn;
 133     nLastBytesOut = bytesOut;
 134
 135     while(vSamplesIn.size() > DESIRED_SAMPLES) {
 136         vSamplesIn.pop_back();
 137     }
 138     while(vSamplesOut.size() > DESIRED_SAMPLES) {
 139         vSamplesOut.pop_back();
 140     }
 141
 142     float tmax = 0.0f;
 143     for (float f : vSamplesIn) {
 144         if(f > tmax) tmax = f;
 145     }
 146     for (float f : vSamplesOut) {
 147         if(f > tmax) tmax = f;
 148     }
 149     fMax = tmax;
 150     update();
 151 }
 152
 153 void TrafficGraphWidget::setGraphRangeMins(int mins)
 154 {
 155     nMins = mins;
 156     int msecsPerSample = nMins * 60 * 1000 / DESIRED_SAMPLES;
 157     timer->stop();
 158     timer->setInterval(msecsPerSample);
 159
 160     clear();
 161 }
 162
 163 void TrafficGraphWidget::clear()
 164 {
 165     timer->stop();
 166
 167     vSamplesOut.clear();
 168     vSamplesIn.clear();
 169     fMax = 0.0f;
 170
 171     if(clientModel) {
 172         nLastBytesIn = clientModel->getTotalBytesRecv();
 173         nLastBytesOut = clientModel->getTotalBytesSent();
 174     }
 175     timer->start();
 176 }