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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "datasource.h"
++
++ #include <QAreaSeries>
++ #include <QQuickItem>
++ #include <QQuickView>
++ #include <QRandomGenerator>
++ #include <QtMath>
++ #include <QXYSeries>
++
++ Q_DECLARE_METATYPE(QAbstractSeries *)
++ Q_DECLARE_METATYPE(QAbstractAxis *)
++
++ DataSource::DataSource(QQuickView *appViewer, QObject *parent)
++ : QObject(parent)
++ , m_appViewer(appViewer)
++ {
++ qRegisterMetaType<QAbstractSeries*>();
++ qRegisterMetaType<QAbstractAxis*>();
++
++ generateData(0, 5, 1024);
++ }
++
++ void DataSource::update(QAbstractSeries *series)
++ {
++ if (series) {
++ auto xySeries = static_cast<QXYSeries *>(series);
++ m_index++;
++ if (m_index > m_data.count() - 1)
++ m_index = 0;
++
++ QList<QPointF> points = m_data.at(m_index);
++ // Use replace instead of clear + append, it's optimized for performance
++ xySeries->replace(points);
++ }
++ }
++
++ void DataSource::generateData(int type, int rowCount, int colCount)
++ {
++ // Remove previous data
++ m_data.clear();
++
++ // Append the new data depending on the type
++ 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) + 0.5 + 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));
++ }
++ m_data.append(points);
++ }
++ }