Revision control
Copy as Markdown
// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "chartsdatasource.h"
#include <QQuickItem>
#include <QQuickView>
#include <QRandomGenerator>
#include <QtCharts/QBarSeries>
#include <QtCharts/QBarSet>
#include <QtCharts/QXYSeries>
#include <QtMath>
ChartsDataSource::ChartsDataSource(QObject *parent)
: QObject(parent)
{}
void ChartsDataSource::reset(int dataScale)
{
m_dataScale = dataScale;
m_testIndex = 0;
m_timer = QDateTime::currentMSecsSinceEpoch();
generateData();
}
void ChartsDataSource::update(QObject *series)
{
if (QDateTime::currentMSecsSinceEpoch() - m_timer >= 4000 && m_testIndex + 1 < m_data.size()) {
m_timer = QDateTime::currentMSecsSinceEpoch();
m_testIndex++;
}
if (series) {
m_index++;
if (m_index > m_data.at(m_testIndex).count() - 1)
m_index = 0;
QList<QPointF> points = m_data.at(m_testIndex).at(m_index);
if (auto xySeries = qobject_cast<QXYSeries *>(series)) {
xySeries->replace(points);
} else if (auto barSeries = qobject_cast<QBarSeries *>(series)) {
QBarSet *set = barSeries->barSets()[0];
for (qsizetype i = 0; i < points.size(); i++) {
if (set->count() <= i)
set->append(points[i].y());
else
set->replace(i, points[i].y());
}
}
}
}
void ChartsDataSource::generateData()
{
int type = 0;
int testCount = 7;
int rowCount = 5;
// Remove previous data
m_data.clear();
// Append the new data depending on the type
for (int k(0); k < testCount; k++) {
int colCount = 0;
if (k > 0)
colCount = qPow(2, k - 1) * m_dataScale;
QList<QList<QPointF>> test;
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);
switch (type) {
case 0:
// data with sin + random component
y = qSin(M_PI / 50 * j) + 5 + QRandomGenerator::global()->generateDouble();
x = j;
break;
case 1:
// linear data
x = j;
y = (qreal) i / 10;
break;
default:
// unknown, do nothing
break;
}
points.append(QPointF(x, y));
}
test.append(points);
}
m_data.append(test);
}
}