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// Copyright (c) 2011-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <interfaces/node.h>
#include <qt/trafficgraphwidget.h>
#include <qt/clientmodel.h>
#include <QPainter>
#include <QPainterPath>
#include <QColor>
#include <QTimer>
#include <chrono>
#include <cmath>
#define DESIRED_SAMPLES 800
#define XMARGIN 10
#define YMARGIN 10
TrafficGraphWidget::TrafficGraphWidget(QWidget *parent) :
QWidget(parent),
timer(nullptr),
fMax(0.0f),
vSamplesIn(),
vSamplesOut(),
nLastBytesIn(0),
nLastBytesOut(0),
clientModel(nullptr)
{
timer = new QTimer(this);
connect(timer, &QTimer::timeout, this, &TrafficGraphWidget::updateRates);
}
void TrafficGraphWidget::setClientModel(ClientModel *model)
{
clientModel = model;
if(model) {
nLastBytesIn = model->node().getTotalBytesRecv();
nLastBytesOut = model->node().getTotalBytesSent();
}
}
std::chrono::minutes TrafficGraphWidget::getGraphRange() const { return m_range; }
void TrafficGraphWidget::paintPath(QPainterPath &path, QQueue<float> &samples)
{
int sampleCount = samples.size();
if(sampleCount > 0) {
int h = height() - YMARGIN * 2, w = width() - XMARGIN * 2;
int x = XMARGIN + w;
path.moveTo(x, YMARGIN + h);
for(int i = 0; i < sampleCount; ++i) {
x = XMARGIN + w - w * i / DESIRED_SAMPLES;
int 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");
const float yMarginText = 2.0;
// draw lines
painter.setPen(axisCol);
painter.drawText(XMARGIN, YMARGIN + h - h * val / fMax-yMarginText, 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-yMarginText, 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);
}
}
painter.setRenderHint(QPainter::Antialiasing);
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->node().getTotalBytesRecv(),
bytesOut = clientModel->node().getTotalBytesSent();
float in_rate_kilobytes_per_sec = static_cast<float>(bytesIn - nLastBytesIn) / timer->interval();
float out_rate_kilobytes_per_sec = static_cast<float>(bytesOut - nLastBytesOut) / timer->interval();
vSamplesIn.push_front(in_rate_kilobytes_per_sec);
vSamplesOut.push_front(out_rate_kilobytes_per_sec);
nLastBytesIn = bytesIn;
nLastBytesOut = bytesOut;
while(vSamplesIn.size() > DESIRED_SAMPLES) {
vSamplesIn.pop_back();
}
while(vSamplesOut.size() > DESIRED_SAMPLES) {
vSamplesOut.pop_back();
}
float tmax = 0.0f;
for (const float f : vSamplesIn) {
if(f > tmax) tmax = f;
}
for (const float f : vSamplesOut) {
if(f > tmax) tmax = f;
}
fMax = tmax;
update();
}
void TrafficGraphWidget::setGraphRange(std::chrono::minutes new_range)
{
m_range = new_range;
const auto msecs_per_sample{std::chrono::duration_cast<std::chrono::milliseconds>(m_range) / DESIRED_SAMPLES};
timer->stop();
timer->setInterval(msecs_per_sample);
clear();
}
void TrafficGraphWidget::clear()
{
timer->stop();
vSamplesOut.clear();
vSamplesIn.clear();
fMax = 0.0f;
if(clientModel) {
nLastBytesIn = clientModel->node().getTotalBytesRecv();
nLastBytesOut = clientModel->node().getTotalBytesSent();
}
timer->start();
}
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