datasource.cpp
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| text/x-c
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CppLexer
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r2854 | /**************************************************************************** | ||
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r2820 | ** | ||
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r2854 | ** Copyright (C) 2016 The Qt Company Ltd. | ||
** Contact: https://www.qt.io/licensing/ | ||||
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r2820 | ** | ||
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r2854 | ** This file is part of the Qt Charts module of the Qt Toolkit. | ||
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r2820 | ** | ||
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r2854 | ** $QT_BEGIN_LICENSE:GPL$ | ||
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r2845 | ** 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 | ||||
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r2854 | ** 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. | ||||
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r2820 | ** | ||
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r2845 | ** $QT_END_LICENSE$ | ||
** | ||||
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r2854 | ****************************************************************************/ | ||
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r2820 | |||
#include "datasource.h" | ||||
#include <QtCore/QtMath> | ||||
QT_CHARTS_USE_NAMESPACE | ||||
DataSource::DataSource(QObject *parent) : | ||||
QObject(parent), | ||||
m_index(-1) | ||||
{ | ||||
generateData(0, 0, 0); | ||||
} | ||||
void DataSource::update(QAbstractSeries *series, int seriesIndex) | ||||
{ | ||||
if (series) { | ||||
QXYSeries *xySeries = static_cast<QXYSeries *>(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 | ||||
xySeries->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[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))); | ||||
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r2826 | m_fpsLabel->adjustSize(); | ||
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r2820 | frameCount = 0; | ||
} | ||||
} | ||||
void DataSource::startUpdates(const QList<QXYSeries *> &seriesList, QLabel *fpsLabel) | ||||
{ | ||||
m_seriesList = seriesList; | ||||
m_fpsLabel = fpsLabel; | ||||
m_dataUpdater.setInterval(0); | ||||
m_dataUpdater.setSingleShot(true); | ||||
QObject::connect(&m_dataUpdater, &QTimer::timeout, | ||||
this, &DataSource::updateAllSeries); | ||||
m_fpsTimer.start(); | ||||
updateAllSeries(); | ||||
} | ||||
void DataSource::generateData(int seriesCount, int rowCount, int colCount) | ||||
{ | ||||
// Remove previous data | ||||
foreach (QVector<QVector<QPointF> > seriesData, m_data) { | ||||
foreach (QVector<QPointF> row, seriesData) | ||||
row.clear(); | ||||
} | ||||
m_data.clear(); | ||||
qreal xAdjustment = 20.0 / (colCount * rowCount); | ||||
qreal yMultiplier = 3.0 / qreal(seriesCount); | ||||
// Append the new data depending on the type | ||||
for (int k(0); k < seriesCount; k++) { | ||||
QVector<QVector<QPointF> > seriesData; | ||||
qreal height = qreal(k) * (10.0 / qreal(seriesCount)) + 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(3.14159265358979 / 50 * j) | ||||
+ (yMultiplier * (qreal) rand() / (qreal) RAND_MAX)); | ||||
// 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); | ||||
} | ||||
m_data.append(seriesData); | ||||
} | ||||
} | ||||