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/****************************************************************************
**
** 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
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "xyseriesiodevice.h"
#include <QtCharts/QXYSeries>
XYSeriesIODevice::XYSeriesIODevice(QXYSeries *series, QObject *parent) :
QIODevice(parent),
m_series(series)
{
}
qint64 XYSeriesIODevice::readData(char *data, qint64 maxSize)
{
Q_UNUSED(data)
Q_UNUSED(maxSize)
return -1;
}
qint64 XYSeriesIODevice::writeData(const char *data, qint64 maxSize)
{
static const int resolution = 4;
if (m_buffer.isEmpty()) {
m_buffer.reserve(sampleCount);
for (int i = 0; i < sampleCount; ++i)
m_buffer.append(QPointF(i, 0));
}
int start = 0;
const int availableSamples = int(maxSize) / resolution;
if (availableSamples < sampleCount) {
start = sampleCount - availableSamples;
for (int s = 0; s < start; ++s)
m_buffer[s].setY(m_buffer.at(s + availableSamples).y());
}
for (int s = start; s < sampleCount; ++s, data += resolution)
m_buffer[s].setY(qreal(uchar(*data) -128) / qreal(128));
m_series->replace(m_buffer);
return (sampleCount - start) * resolution;
}
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