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/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd
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** All rights reserved.
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** For any questions to The Qt Company, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and The Qt Company.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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#include "datasource.h"
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#include <QtCore/QtMath>
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QT_CHARTS_USE_NAMESPACE
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DataSource::DataSource(QObject *parent) :
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QObject(parent),
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m_index(-1)
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{
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}
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void DataSource::update(QXYSeries *series, int seriesIndex)
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{
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if (series) {
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const QVector<QVector<QPointF> > &seriesData = m_data.at(seriesIndex);
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if (seriesIndex == 0)
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m_index++;
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if (m_index > seriesData.count() - 1)
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m_index = 0;
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QVector<QPointF> points = seriesData.at(m_index);
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// Use replace instead of clear + append, it's optimized for performance
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series->replace(points);
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}
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}
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void DataSource::handleSceneChanged()
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{
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m_dataUpdater.start();
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}
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void DataSource::updateAllSeries()
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{
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static int frameCount = 0;
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static QString labelText = QStringLiteral("FPS: %1");
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for (int i = 0; i < m_seriesList->size(); i++)
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update(m_seriesList->value(i), i);
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frameCount++;
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int elapsed = m_fpsTimer.elapsed();
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if (elapsed >= 1000) {
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elapsed = m_fpsTimer.restart();
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qreal fps = qreal(0.1 * int(10000.0 * (qreal(frameCount) / qreal(elapsed))));
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m_fpsLabel->setText(labelText.arg(QString::number(fps, 'f', 1)));
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m_fpsLabel->adjustSize();
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frameCount = 0;
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}
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}
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void DataSource::startUpdates(QList<QXYSeries *> &seriesList, QLabel *fpsLabel)
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{
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m_seriesList = &seriesList;
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m_fpsLabel = fpsLabel;
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m_dataUpdater.setInterval(0);
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m_dataUpdater.setSingleShot(true);
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QObject::connect(&m_dataUpdater, &QTimer::timeout,
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this, &DataSource::updateAllSeries);
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m_fpsTimer.start();
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m_data.resize(maxSeriesCount);
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updateAllSeries();
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}
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void DataSource::generateData(int seriesIndex, int rowCount, int colCount)
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{
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// Remove previous data
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QVector<QVector<QPointF> > &seriesData = m_data[seriesIndex];
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seriesData.clear();
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seriesData.reserve(rowCount);
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qreal xAdjustment = 20.0 / (colCount * rowCount);
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qreal yMultiplier = 3.0 / qreal(maxSeriesCount);
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// Append the new data depending on the type
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qreal height = qreal(seriesIndex) * (10.0 / qreal(maxSeriesCount)) + 0.3;
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for (int i(0); i < rowCount; i++) {
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QVector<QPointF> points;
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points.reserve(colCount);
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for (int j(0); j < colCount; j++) {
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qreal x(0);
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qreal y(0);
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// data with sin + random component
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y = height + (yMultiplier * qSin(3.14159265358979 / 50 * j)
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+ (yMultiplier * (qreal) rand() / (qreal) RAND_MAX));
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// 0.000001 added to make values logaxis compatible
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x = 0.000001 + 20.0 * (qreal(j) / qreal(colCount)) + (xAdjustment * qreal(i));
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points.append(QPointF(x, y));
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}
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seriesData.append(points);
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}
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}
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