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/******************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Charts module.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
******************************************************************************/
#include "datasource.h"
#include <QtCharts/QXYSeries>
#include <QtCharts/QAreaSeries>
#include <QtQuick/QQuickView>
#include <QtQuick/QQuickItem>
#include <QtCore/QDebug>
#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
foreach (QVector<QPointF> row, m_data)
row.clear();
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(3.14159265358979 / 50 * j) + 0.5 + (qreal) rand() / (qreal) RAND_MAX;
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);
}
}
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