datasource.cpp
112 lines
| 3.4 KiB
| text/x-c
|
CppLexer
Miikka Heikkinen
|
r2834 | /**************************************************************************** | ||
| ** | ||||
| ** Copyright (C) 2015 The Qt Company Ltd | ||||
| ** All rights reserved. | ||||
| ** For any questions to The Qt Company, please use contact form at http://qt.io | ||||
| ** | ||||
| ** This file is part of the Qt Charts module. | ||||
| ** | ||||
| ** Licensees holding valid commercial license for Qt may use this file in | ||||
| ** accordance with the Qt License Agreement provided with the Software | ||||
| ** or, alternatively, in accordance with the terms contained in a written | ||||
| ** agreement between you and The Qt Company. | ||||
| ** | ||||
| ** If you have questions regarding the use of this file, please use | ||||
| ** contact form at http://qt.io | ||||
| ** | ||||
| ****************************************************************************/ | ||||
| #include "datasource.h" | ||||
| #include <QtCore/QtMath> | ||||
| 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::startUpdates(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(); | ||||
| 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(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); | ||||
| } | ||||
| } | ||||