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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 <QtCharts/QXYSeries>
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#include <QtCharts/QAreaSeries>
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#include <QtQuick/QQuickView>
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#include <QtQuick/QQuickItem>
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#include <QtCore/QDebug>
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#include <QtCore/QtMath>
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QT_CHARTS_USE_NAMESPACE
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Q_DECLARE_METATYPE(QAbstractSeries *)
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Q_DECLARE_METATYPE(QAbstractAxis *)
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DataSource::DataSource(QQuickView *appViewer, QObject *parent) :
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QObject(parent),
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m_appViewer(appViewer),
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m_index(-1)
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{
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qRegisterMetaType<QAbstractSeries*>();
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qRegisterMetaType<QAbstractAxis*>();
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generateData(0, 5, 1024);
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}
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void DataSource::update(QAbstractSeries *series)
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{
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if (series) {
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QXYSeries *xySeries = static_cast<QXYSeries *>(series);
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m_index++;
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if (m_index > m_data.count() - 1)
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m_index = 0;
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QVector<QPointF> points = m_data.at(m_index);
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// Use replace instead of clear + append, it's optimized for performance
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xySeries->replace(points);
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}
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}
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void DataSource::generateData(int type, int rowCount, int colCount)
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{
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// Remove previous data
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foreach (QVector<QPointF> row, m_data)
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row.clear();
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m_data.clear();
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// Append the new data depending on the type
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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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switch (type) {
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case 0:
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// data with sin + random component
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y = qSin(3.14159265358979 / 50 * j) + 0.5 + (qreal) rand() / (qreal) RAND_MAX;
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x = j;
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break;
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case 1:
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// linear data
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x = j;
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y = (qreal) i / 10;
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break;
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default:
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// unknown, do nothing
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break;
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}
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points.append(QPointF(x, y));
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}
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m_data.append(points);
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}
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}
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