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<h1 class="title">xyseriesiodevice.cpp Example File</h1>
<span class="subtitle">audio/xyseriesiodevice.cpp</span>
<!-- $$$audio/xyseriesiodevice.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "xyseriesiodevice.h"</span>
<span class="preprocessor">#include <QtCharts/QXYSeries></span>
XYSeriesIODevice<span class="operator">::</span>XYSeriesIODevice(<span class="type"><a href="qxyseries.html">QXYSeries</a></span> <span class="operator">*</span> series<span class="operator">,</span> <span class="type">QObject</span> <span class="operator">*</span>parent) :
<span class="type">QIODevice</span>(parent)<span class="operator">,</span>
m_series(series)
{
}
<span class="type">qint64</span> XYSeriesIODevice<span class="operator">::</span>readData(<span class="type">char</span> <span class="operator">*</span> data<span class="operator">,</span> <span class="type">qint64</span> maxSize)
{
Q_UNUSED(data)
Q_UNUSED(maxSize)
<span class="keyword">return</span> <span class="operator">-</span><span class="number">1</span>;
}
<span class="type">qint64</span> XYSeriesIODevice<span class="operator">::</span>writeData(<span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span> data<span class="operator">,</span> <span class="type">qint64</span> maxSize)
{
<span class="type">qint64</span> range <span class="operator">=</span> <span class="number">2000</span>;
<span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> oldPoints <span class="operator">=</span> m_series<span class="operator">-</span><span class="operator">></span>pointsVector();
<span class="type">QVector</span><span class="operator"><</span><span class="type">QPointF</span><span class="operator">></span> points;
<span class="type">int</span> resolution <span class="operator">=</span> <span class="number">4</span>;
<span class="keyword">if</span> (oldPoints<span class="operator">.</span>count() <span class="operator"><</span> range) {
points <span class="operator">=</span> m_series<span class="operator">-</span><span class="operator">></span>pointsVector();
} <span class="keyword">else</span> {
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> maxSize<span class="operator">/</span>resolution; i <span class="operator"><</span> oldPoints<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>)
points<span class="operator">.</span>append(<span class="type">QPointF</span>(i <span class="operator">-</span> maxSize<span class="operator">/</span>resolution<span class="operator">,</span> oldPoints<span class="operator">.</span>at(i)<span class="operator">.</span>y()));
}
<span class="type">qint64</span> size <span class="operator">=</span> points<span class="operator">.</span>count();
<span class="keyword">for</span> (<span class="type">int</span> k <span class="operator">=</span> <span class="number">0</span>; k <span class="operator"><</span> maxSize<span class="operator">/</span>resolution; k<span class="operator">+</span><span class="operator">+</span>)
points<span class="operator">.</span>append(<span class="type">QPointF</span>(k <span class="operator">+</span> size<span class="operator">,</span> ((<span class="type">quint8</span>)data<span class="operator">[</span>resolution <span class="operator">*</span> k<span class="operator">]</span> <span class="operator">-</span> <span class="number">128</span>)<span class="operator">/</span><span class="number">128.0</span>));
m_series<span class="operator">-</span><span class="operator">></span>replace(points);
<span class="keyword">return</span> maxSize;
}
</pre>
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<!-- @@@audio/xyseriesiodevice.cpp -->
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