<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>widget.cpp Example File | Qt Charts 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtcharts-index.html">Qt Charts</a></td><td ><a href="qtcharts-audio-example.html">Audio Example</a></td><td >widget.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtcharts-index.html">Qt Charts | Commercial or GPLv3</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">widget.cpp Example File</h1> <span class="subtitle">audio/widget.cpp</span> <!-- $$$audio/widget.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 "widget.h"</span> <span class="preprocessor">#include "xyseriesiodevice.h"</span> <span class="preprocessor">#include <QtMultimedia/QAudioDeviceInfo></span> <span class="preprocessor">#include <QtMultimedia/QAudioInput></span> <span class="preprocessor">#include <QtCharts/QChartView></span> <span class="preprocessor">#include <QtCharts/QLineSeries></span> <span class="preprocessor">#include <QtCharts/QChart></span> <span class="preprocessor">#include <QtCharts/QValueAxis></span> <span class="preprocessor">#include <QtWidgets/QVBoxLayout></span> QT_CHARTS_USE_NAMESPACE Widget<span class="operator">::</span>Widget(<span class="keyword">const</span> <span class="type">QAudioDeviceInfo</span> <span class="operator">&</span>deviceInfo<span class="operator">,</span> <span class="type">QWidget</span> <span class="operator">*</span>parent) : <span class="type">QWidget</span>(parent)<span class="operator">,</span> m_chart(<span class="keyword">new</span> <span class="type"><a href="qchart.html">QChart</a></span>)<span class="operator">,</span> m_series(<span class="keyword">new</span> <span class="type"><a href="qlineseries.html">QLineSeries</a></span>) { <span class="type"><a href="qchartview.html">QChartView</a></span> <span class="operator">*</span>chartView <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qchartview.html">QChartView</a></span>(m_chart); chartView<span class="operator">-</span><span class="operator">></span>setMinimumSize(<span class="number">800</span><span class="operator">,</span> <span class="number">600</span>); m_chart<span class="operator">-</span><span class="operator">></span>addSeries(m_series); <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span> <span class="operator">*</span>axisX <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span>; axisX<span class="operator">-</span><span class="operator">></span>setRange(<span class="number">0</span><span class="operator">,</span> XYSeriesIODevice<span class="operator">::</span>sampleCount); axisX<span class="operator">-</span><span class="operator">></span>setLabelFormat(<span class="string">"%g"</span>); axisX<span class="operator">-</span><span class="operator">></span>setTitleText(<span class="string">"Samples"</span>); <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span> <span class="operator">*</span>axisY <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvalueaxis.html">QValueAxis</a></span>; axisY<span class="operator">-</span><span class="operator">></span>setRange(<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> <span class="number">1</span>); axisY<span class="operator">-</span><span class="operator">></span>setTitleText(<span class="string">"Audio level"</span>); m_chart<span class="operator">-</span><span class="operator">></span>addAxis(axisX<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>AlignBottom); m_series<span class="operator">-</span><span class="operator">></span>attachAxis(axisX); m_chart<span class="operator">-</span><span class="operator">></span>addAxis(axisY<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>AlignLeft); m_series<span class="operator">-</span><span class="operator">></span>attachAxis(axisY); m_chart<span class="operator">-</span><span class="operator">></span>legend()<span class="operator">-</span><span class="operator">></span>hide(); m_chart<span class="operator">-</span><span class="operator">></span>setTitle(<span class="string">"Data from the microphone ("</span> <span class="operator">+</span> deviceInfo<span class="operator">.</span>deviceName() <span class="operator">+</span> <span class="char">')'</span>); <span class="type">QVBoxLayout</span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>(<span class="keyword">this</span>); mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(chartView); <span class="type">QAudioFormat</span> formatAudio; formatAudio<span class="operator">.</span>setSampleRate(<span class="number">8000</span>); formatAudio<span class="operator">.</span>setChannelCount(<span class="number">1</span>); formatAudio<span class="operator">.</span>setSampleSize(<span class="number">8</span>); formatAudio<span class="operator">.</span>setCodec(<span class="string">"audio/pcm"</span>); formatAudio<span class="operator">.</span>setByteOrder(<span class="type">QAudioFormat</span><span class="operator">::</span>LittleEndian); formatAudio<span class="operator">.</span>setSampleType(<span class="type">QAudioFormat</span><span class="operator">::</span>UnSignedInt); m_audioInput <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QAudioInput</span>(deviceInfo<span class="operator">,</span> formatAudio<span class="operator">,</span> <span class="keyword">this</span>); m_device <span class="operator">=</span> <span class="keyword">new</span> XYSeriesIODevice(m_series<span class="operator">,</span> <span class="keyword">this</span>); m_device<span class="operator">-</span><span class="operator">></span>open(<span class="type">QIODevice</span><span class="operator">::</span>WriteOnly); m_audioInput<span class="operator">-</span><span class="operator">></span>start(m_device); } Widget<span class="operator">::</span><span class="operator">~</span>Widget() { m_audioInput<span class="operator">-</span><span class="operator">></span>stop(); m_device<span class="operator">-</span><span class="operator">></span>close(); } </pre> </div> <!-- @@@audio/widget.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>