From ce14345a89dfa05992f8d2c7c9fe36315d4a67e6 Mon Sep 17 00:00:00 2001
From: Scott Ellis <sje397@gmail.com>
Date: Fri, 23 Aug 2013 02:09:32 +1000
Subject: Add network traffic graph

---
 src/qt/trafficgraphwidget.cpp | 169 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 src/qt/trafficgraphwidget.cpp

(limited to 'src/qt/trafficgraphwidget.cpp')

diff --git a/src/qt/trafficgraphwidget.cpp b/src/qt/trafficgraphwidget.cpp
new file mode 100644
index 0000000000..d49bc31f3e
--- /dev/null
+++ b/src/qt/trafficgraphwidget.cpp
@@ -0,0 +1,169 @@
+#include "trafficgraphwidget.h"
+#include "clientmodel.h"
+
+#include <QPainter>
+#include <QColor>
+#include <QTimer>
+
+#include <cmath>
+
+#define DESIRED_SAMPLES         800
+
+#define XMARGIN                 10
+#define YMARGIN                 10
+
+TrafficGraphWidget::TrafficGraphWidget(QWidget *parent) :
+    QWidget(parent),
+    timer(0),
+    fMax(0.0f),
+    nMins(0),
+    vSamplesIn(),
+    vSamplesOut(),
+    nLastBytesIn(0),
+    nLastBytesOut(0),
+    clientModel(0)
+{
+    timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), SLOT(updateRates()));
+}
+
+void TrafficGraphWidget::setClientModel(ClientModel *model)
+{
+    clientModel = model;
+    if(model) {
+        nLastBytesIn = model->getTotalBytesRecv();
+        nLastBytesOut = model->getTotalBytesSent();
+    }
+}
+
+int TrafficGraphWidget::getGraphRangeMins() const
+{
+    return nMins;
+}
+
+void TrafficGraphWidget::paintPath(QPainterPath &path, QQueue<float> &samples)
+{
+    int h = height() - YMARGIN * 2, w = width() - XMARGIN * 2;
+    int sampleCount = samples.size(), x = XMARGIN + w, y;
+    if(sampleCount > 0) {
+        path.moveTo(x, YMARGIN + h);
+        for(int i = 0; i < sampleCount; ++i) {
+            x = XMARGIN + w - w * i / DESIRED_SAMPLES;
+            y = YMARGIN + h - (int)(h * samples.at(i) / fMax);
+            path.lineTo(x, y);
+        }
+        path.lineTo(x, YMARGIN + h);
+    }
+}
+
+void TrafficGraphWidget::paintEvent(QPaintEvent *)
+{
+    QPainter painter(this);
+    painter.fillRect(rect(), Qt::black);
+
+    if(fMax <= 0.0f) return;
+
+    QColor axisCol(Qt::gray);
+    int h = height() - YMARGIN * 2;
+    painter.setPen(axisCol);
+    painter.drawLine(XMARGIN, YMARGIN + h, width() - XMARGIN, YMARGIN + h);
+
+    // decide what order of magnitude we are
+    int base = floor(log10(fMax));
+    float val = pow(10.0f, base);
+
+    const QString units = tr("KB/s");
+    // draw lines
+    painter.setPen(axisCol);
+    painter.drawText(XMARGIN, YMARGIN + h - h * val / fMax, QString("%1 %2").arg(val).arg(units));
+    for(float y = val; y < fMax; y += val) {
+        int yy = YMARGIN + h - h * y / fMax;
+        painter.drawLine(XMARGIN, yy, width() - XMARGIN, yy);
+    }
+    // if we drew 3 or fewer lines, break them up at the next lower order of magnitude
+    if(fMax / val <= 3.0f) {
+        axisCol = axisCol.darker();
+        val = pow(10.0f, base - 1);
+        painter.setPen(axisCol);
+        painter.drawText(XMARGIN, YMARGIN + h - h * val / fMax, QString("%1 %2").arg(val).arg(units));
+        int count = 1;
+        for(float y = val; y < fMax; y += val, count++) {
+            // don't overwrite lines drawn above
+            if(count % 10 == 0)
+                continue;
+            int yy = YMARGIN + h - h * y / fMax;
+            painter.drawLine(XMARGIN, yy, width() - XMARGIN, yy);
+        }
+    }
+
+    if(!vSamplesIn.empty()) {
+        QPainterPath p;
+        paintPath(p, vSamplesIn);
+        painter.fillPath(p, QColor(0, 255, 0, 128));
+        painter.setPen(Qt::green);
+        painter.drawPath(p);
+    }
+    if(!vSamplesOut.empty()) {
+        QPainterPath p;
+        paintPath(p, vSamplesOut);
+        painter.fillPath(p, QColor(255, 0, 0, 128));
+        painter.setPen(Qt::red);
+        painter.drawPath(p);
+    }
+}
+
+void TrafficGraphWidget::updateRates()
+{
+    if(!clientModel) return;
+
+    quint64 bytesIn = clientModel->getTotalBytesRecv(),
+            bytesOut = clientModel->getTotalBytesSent();
+    float inRate = (bytesIn - nLastBytesIn) / 1024.0f * 1000 / timer->interval();
+    float outRate = (bytesOut - nLastBytesOut) / 1024.0f * 1000 / timer->interval();
+    vSamplesIn.push_front(inRate);
+    vSamplesOut.push_front(outRate);
+    nLastBytesIn = bytesIn;
+    nLastBytesOut = bytesOut;
+
+    while(vSamplesIn.size() > DESIRED_SAMPLES) {
+        vSamplesIn.pop_back();
+    }
+    while(vSamplesOut.size() > DESIRED_SAMPLES) {
+        vSamplesOut.pop_back();
+    }
+
+    float tmax = 0.0f;
+    foreach(float f, vSamplesIn) {
+        if(f > tmax) tmax = f;
+    }
+    foreach(float f, vSamplesOut) {
+        if(f > tmax) tmax = f;
+    }
+    fMax = tmax;
+    update();
+}
+
+void TrafficGraphWidget::setGraphRangeMins(int mins)
+{
+    nMins = mins;
+    int msecsPerSample = nMins * 60 * 1000 / DESIRED_SAMPLES;
+    timer->stop();
+    timer->setInterval(msecsPerSample);
+
+    clear();
+}
+
+void TrafficGraphWidget::clear()
+{
+    timer->stop();
+
+    vSamplesOut.clear();
+    vSamplesIn.clear();
+    fMax = 0.0f;
+
+    if(clientModel) {
+        nLastBytesIn = clientModel->getTotalBytesRecv();
+        nLastBytesOut = clientModel->getTotalBytesSent();
+    }
+    timer->start();
+}
-- 
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