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