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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "datasource.h"
#include <QtCore/QtMath>
#include <QtCore/QRandomGenerator>
QT_USE_NAMESPACE
DataSource::DataSource(QObject *parent) :
QObject(parent),
m_index(-1)
{
}
void DataSource::update(QXYSeries *series, int seriesIndex)
{
if (series) {
const QList<QList<QPointF>> &seriesData = m_data.at(seriesIndex);
if (seriesIndex == 0)
m_index++;
if (m_index > seriesData.count() - 1)
m_index = 0;
QList<QPointF> points = seriesData.at(m_index);
// Use replace instead of clear + append, it's optimized for performance
series->replace(points);
}
}
void DataSource::handleSceneChanged()
{
m_dataUpdater.start();
}
void DataSource::updateAllSeries()
{
static int frameCount = 0;
static QString labelText = QStringLiteral("FPS: %1");
for (int i = 0; i < m_seriesList->size(); i++)
update(m_seriesList->value(i), i);
frameCount++;
int elapsed = m_fpsTimer.elapsed();
if (elapsed >= 1000) {
elapsed = m_fpsTimer.restart();
qreal fps = qreal(0.1 * int(10000.0 * (qreal(frameCount) / qreal(elapsed))));
m_fpsLabel->setText(labelText.arg(QString::number(fps, 'f', 1)));
m_fpsLabel->adjustSize();
frameCount = 0;
}
}
void DataSource::setInterval(int interval)
{
m_dataUpdater.setInterval(interval);
}
void DataSource::startUpdates(QList<QXYSeries *> &seriesList, QLabel *fpsLabel, int interval)
{
m_seriesList = &seriesList;
m_fpsLabel = fpsLabel;
m_dataUpdater.setInterval(interval);
m_dataUpdater.setSingleShot(true);
QObject::connect(&m_dataUpdater, &QTimer::timeout,
this, &DataSource::updateAllSeries);
m_fpsTimer.start();
m_data.resize(maxSeriesCount);
updateAllSeries();
}
void DataSource::generateData(int seriesIndex, int rowCount, int colCount)
{
// Remove previous data
QList<QList<QPointF>> &seriesData = m_data[seriesIndex];
seriesData.clear();
seriesData.reserve(rowCount);
qreal xAdjustment = 20.0 / (colCount * rowCount);
qreal yMultiplier = 3.0 / qreal(maxSeriesCount);
// Append the new data depending on the type
qreal height = qreal(seriesIndex) * (10.0 / qreal(maxSeriesCount)) + 0.3;
for (int i(0); i < rowCount; i++) {
QList<QPointF> points;
points.reserve(colCount);
for (int j(0); j < colCount; j++) {
qreal x(0);
qreal y(0);
// data with sin + random component
y = height + (yMultiplier * qSin(M_PI / 50 * j)
+ (yMultiplier * QRandomGenerator::global()->generateDouble()));
// 0.000001 added to make values logaxis compatible
x = 0.000001 + 20.0 * (qreal(j) / qreal(colCount)) + (xAdjustment * qreal(i));
points.append(QPointF(x, y));
}
seriesData.append(points);
}
}
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