| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the Qt Charts module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:GPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 3 or (at your option) any later version |
| ** approved by the KDE Free Qt Foundation. The licenses are as published by |
| ** the Free Software Foundation and appearing in the file LICENSE.GPL3 |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
| ** be met: https://www.gnu.org/licenses/gpl-3.0.html. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "datasource.h" |
| #include <QtCore/QtMath> |
| #include <QtCore/QRandomGenerator> |
| |
| QT_CHARTS_USE_NAMESPACE |
| |
| DataSource::DataSource(QObject *parent) : |
| QObject(parent), |
| m_index(-1) |
| { |
| } |
| |
| void DataSource::update(QXYSeries *series, int seriesIndex) |
| { |
| if (series) { |
| const QVector<QVector<QPointF> > &seriesData = m_data.at(seriesIndex); |
| if (seriesIndex == 0) |
| m_index++; |
| if (m_index > seriesData.count() - 1) |
| m_index = 0; |
| |
| QVector<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 |
| QVector<QVector<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++) { |
| QVector<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); |
| } |
| } |