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<h1 class="title">devicehandler.cpp Example File</h1>
<span class="subtitle">heartrate-game/devicehandler.cpp</span>
<!-- $$$heartrate-game/devicehandler.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/***************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the QtBluetooth module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** 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.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;heartrate-global.h&quot;</span>
  <span class="preprocessor">#include &quot;devicehandler.h&quot;</span>
  <span class="preprocessor">#include &quot;deviceinfo.h&quot;</span>
  <span class="preprocessor">#include &lt;QtEndian&gt;</span>
  <span class="preprocessor">#include &lt;QRandomGenerator&gt;</span>

  DeviceHandler<span class="operator">::</span>DeviceHandler(<span class="type">QObject</span> <span class="operator">*</span>parent) :
      BluetoothBaseClass(parent)<span class="operator">,</span>
      m_foundHeartRateService(<span class="keyword">false</span>)<span class="operator">,</span>
      m_measuring(<span class="keyword">false</span>)<span class="operator">,</span>
      m_currentValue(<span class="number">0</span>)<span class="operator">,</span>
      m_min(<span class="number">0</span>)<span class="operator">,</span> m_max(<span class="number">0</span>)<span class="operator">,</span> m_sum(<span class="number">0</span>)<span class="operator">,</span> m_avg(<span class="number">0</span>)<span class="operator">,</span> m_calories(<span class="number">0</span>)
  {
  <span class="preprocessor">#ifdef SIMULATOR</span>
      m_demoTimer<span class="operator">.</span>setSingleShot(<span class="keyword">false</span>);
      m_demoTimer<span class="operator">.</span>setInterval(<span class="number">2000</span>);
      connect(<span class="operator">&amp;</span>m_demoTimer<span class="operator">,</span> <span class="operator">&amp;</span><span class="type">QTimer</span><span class="operator">::</span>timeout<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DeviceHandler<span class="operator">::</span>updateDemoHR);
      m_demoTimer<span class="operator">.</span>start();
      updateDemoHR();
  <span class="preprocessor">#endif</span>
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>setAddressType(AddressType type)
  {
      <span class="keyword">switch</span> (type) {
      <span class="keyword">case</span> DeviceHandler<span class="operator">::</span>AddressType<span class="operator">::</span>PublicAddress:
          m_addressType <span class="operator">=</span> <span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>PublicAddress;
          <span class="keyword">break</span>;
      <span class="keyword">case</span> DeviceHandler<span class="operator">::</span>AddressType<span class="operator">::</span>RandomAddress:
          m_addressType <span class="operator">=</span> <span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>RandomAddress;
          <span class="keyword">break</span>;
      }
  }

  DeviceHandler<span class="operator">::</span>AddressType DeviceHandler<span class="operator">::</span>addressType() <span class="keyword">const</span>
  {
      <span class="keyword">if</span> (m_addressType <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>RandomAddress)
          <span class="keyword">return</span> DeviceHandler<span class="operator">::</span>AddressType<span class="operator">::</span>RandomAddress;

      <span class="keyword">return</span> DeviceHandler<span class="operator">::</span>AddressType<span class="operator">::</span>PublicAddress;
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>setDevice(DeviceInfo <span class="operator">*</span>device)
  {
      clearMessages();
      m_currentDevice <span class="operator">=</span> device;

  <span class="preprocessor">#ifdef SIMULATOR</span>
      setInfo(tr(<span class="string">&quot;Demo device connected.&quot;</span>));
      <span class="keyword">return</span>;
  <span class="preprocessor">#endif</span>

      <span class="comment">// Disconnect and delete old connection</span>
      <span class="keyword">if</span> (m_control) {
          m_control<span class="operator">-</span><span class="operator">&gt;</span>disconnectFromDevice();
          <span class="keyword">delete</span> m_control;
          m_control <span class="operator">=</span> nullptr;
      }

      <span class="comment">// Create new controller and connect it if device available</span>
      <span class="keyword">if</span> (m_currentDevice) {

          <span class="comment">// Make connections</span>
          m_control <span class="operator">=</span> <span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>createCentral(m_currentDevice<span class="operator">-</span><span class="operator">&gt;</span>getDevice()<span class="operator">,</span> <span class="keyword">this</span>);
          m_control<span class="operator">-</span><span class="operator">&gt;</span>setRemoteAddressType(m_addressType);
          connect(m_control<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>serviceDiscovered<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DeviceHandler<span class="operator">::</span>serviceDiscovered);
          connect(m_control<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>discoveryFinished<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DeviceHandler<span class="operator">::</span>serviceScanDone);

          connect(m_control<span class="operator">,</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">void</span> (<span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span><span class="operator">*</span>)(<span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>Error)<span class="operator">&gt;</span>(<span class="operator">&amp;</span><span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>error)<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> <span class="operator">[</span><span class="keyword">this</span><span class="operator">]</span>(<span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>Error error) {
              Q_UNUSED(error);
              setError(<span class="string">&quot;Cannot connect to remote device.&quot;</span>);
          });
          connect(m_control<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>connected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">[</span><span class="keyword">this</span><span class="operator">]</span>() {
              setInfo(<span class="string">&quot;Controller connected. Search services...&quot;</span>);
              m_control<span class="operator">-</span><span class="operator">&gt;</span>discoverServices();
          });
          connect(m_control<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qlowenergycontroller.html">QLowEnergyController</a></span><span class="operator">::</span>disconnected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">[</span><span class="keyword">this</span><span class="operator">]</span>() {
              setError(<span class="string">&quot;LowEnergy controller disconnected&quot;</span>);
          });

          <span class="comment">// Connect</span>
          m_control<span class="operator">-</span><span class="operator">&gt;</span>connectToDevice();
      }
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>startMeasurement()
  {
      <span class="keyword">if</span> (alive()) {
          m_start <span class="operator">=</span> <span class="type">QDateTime</span><span class="operator">::</span>currentDateTime();
          m_min <span class="operator">=</span> <span class="number">0</span>;
          m_max <span class="operator">=</span> <span class="number">0</span>;
          m_avg <span class="operator">=</span> <span class="number">0</span>;
          m_sum <span class="operator">=</span> <span class="number">0</span>;
          m_calories <span class="operator">=</span> <span class="number">0</span>;
          m_measuring <span class="operator">=</span> <span class="keyword">true</span>;
          m_measurements<span class="operator">.</span>clear();
          <span class="keyword">emit</span> measuringChanged();
      }
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>stopMeasurement()
  {
      m_measuring <span class="operator">=</span> <span class="keyword">false</span>;
      <span class="keyword">emit</span> measuringChanged();
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>serviceDiscovered(<span class="keyword">const</span> <span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span> <span class="operator">&amp;</span>gatt)
  {
      <span class="keyword">if</span> (gatt <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span>(<span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span><span class="operator">::</span>HeartRate)) {
          setInfo(<span class="string">&quot;Heart Rate service discovered. Waiting for service scan to be done...&quot;</span>);
          m_foundHeartRateService <span class="operator">=</span> <span class="keyword">true</span>;
      }
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>serviceScanDone()
  {
      setInfo(<span class="string">&quot;Service scan done.&quot;</span>);

      <span class="comment">// Delete old service if available</span>
      <span class="keyword">if</span> (m_service) {
          <span class="keyword">delete</span> m_service;
          m_service <span class="operator">=</span> nullptr;
      }

      <span class="comment">// If heartRateService found, create new service</span>
      <span class="keyword">if</span> (m_foundHeartRateService)
          m_service <span class="operator">=</span> m_control<span class="operator">-</span><span class="operator">&gt;</span>createServiceObject(<span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span>(<span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span><span class="operator">::</span>HeartRate)<span class="operator">,</span> <span class="keyword">this</span>);

      <span class="keyword">if</span> (m_service) {
          connect(m_service<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qlowenergyservice.html">QLowEnergyService</a></span><span class="operator">::</span>stateChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DeviceHandler<span class="operator">::</span>serviceStateChanged);
          connect(m_service<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qlowenergyservice.html">QLowEnergyService</a></span><span class="operator">::</span>characteristicChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DeviceHandler<span class="operator">::</span>updateHeartRateValue);
          connect(m_service<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qlowenergyservice.html">QLowEnergyService</a></span><span class="operator">::</span>descriptorWritten<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>DeviceHandler<span class="operator">::</span>confirmedDescriptorWrite);
          m_service<span class="operator">-</span><span class="operator">&gt;</span>discoverDetails();
      } <span class="keyword">else</span> {
          setError(<span class="string">&quot;Heart Rate Service not found.&quot;</span>);
      }
  }

  <span class="comment">// Service functions</span>
  <span class="type">void</span> DeviceHandler<span class="operator">::</span>serviceStateChanged(<span class="type"><a href="qlowenergyservice.html">QLowEnergyService</a></span><span class="operator">::</span>ServiceState s)
  {
      <span class="keyword">switch</span> (s) {
      <span class="keyword">case</span> <span class="type"><a href="qlowenergyservice.html">QLowEnergyService</a></span><span class="operator">::</span>DiscoveringServices:
          setInfo(tr(<span class="string">&quot;Discovering services...&quot;</span>));
          <span class="keyword">break</span>;
      <span class="keyword">case</span> <span class="type"><a href="qlowenergyservice.html">QLowEnergyService</a></span><span class="operator">::</span>ServiceDiscovered:
      {
          setInfo(tr(<span class="string">&quot;Service discovered.&quot;</span>));

          <span class="keyword">const</span> <span class="type"><a href="qlowenergycharacteristic.html">QLowEnergyCharacteristic</a></span> hrChar <span class="operator">=</span> m_service<span class="operator">-</span><span class="operator">&gt;</span>characteristic(<span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span>(<span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span><span class="operator">::</span>HeartRateMeasurement));
          <span class="keyword">if</span> (<span class="operator">!</span>hrChar<span class="operator">.</span>isValid()) {
              setError(<span class="string">&quot;HR Data not found.&quot;</span>);
              <span class="keyword">break</span>;
          }

          m_notificationDesc <span class="operator">=</span> hrChar<span class="operator">.</span>descriptor(<span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span><span class="operator">::</span>ClientCharacteristicConfiguration);
          <span class="keyword">if</span> (m_notificationDesc<span class="operator">.</span>isValid())
              m_service<span class="operator">-</span><span class="operator">&gt;</span>writeDescriptor(m_notificationDesc<span class="operator">,</span> <span class="type">QByteArray</span><span class="operator">::</span>fromHex(<span class="string">&quot;0100&quot;</span>));

          <span class="keyword">break</span>;
      }
      <span class="keyword">default</span>:
          <span class="comment">//nothing for now</span>
          <span class="keyword">break</span>;
      }

      <span class="keyword">emit</span> aliveChanged();
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>updateHeartRateValue(<span class="keyword">const</span> <span class="type"><a href="qlowenergycharacteristic.html">QLowEnergyCharacteristic</a></span> <span class="operator">&amp;</span>c<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QByteArray</span> <span class="operator">&amp;</span>value)
  {
      <span class="comment">// ignore any other characteristic change -&gt; shouldn't really happen though</span>
      <span class="keyword">if</span> (c<span class="operator">.</span>uuid() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span>(<span class="type"><a href="qbluetoothuuid.html">QBluetoothUuid</a></span><span class="operator">::</span>HeartRateMeasurement))
          <span class="keyword">return</span>;

      <span class="keyword">auto</span> data <span class="operator">=</span> <span class="keyword">reinterpret_cast</span><span class="operator">&lt;</span><span class="keyword">const</span> <span class="type">quint8</span> <span class="operator">*</span><span class="operator">&gt;</span>(value<span class="operator">.</span>constData());
      <span class="type">quint8</span> flags <span class="operator">=</span> <span class="operator">*</span>data;

      <span class="comment">//Heart Rate</span>
      <span class="type">int</span> hrvalue <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">if</span> (flags <span class="operator">&amp;</span> <span class="number">0x1</span>) <span class="comment">// HR 16 bit? otherwise 8 bit</span>
          hrvalue <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">int</span><span class="operator">&gt;</span>(qFromLittleEndian<span class="operator">&lt;</span><span class="type">quint16</span><span class="operator">&gt;</span>(data<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>));
      <span class="keyword">else</span>
          hrvalue <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type">int</span><span class="operator">&gt;</span>(data<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>);

      addMeasurement(hrvalue);
  }

  <span class="preprocessor">#ifdef SIMULATOR</span>
  <span class="type">void</span> DeviceHandler<span class="operator">::</span>updateDemoHR()
  {
      <span class="type">int</span> randomValue <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">if</span> (m_currentValue <span class="operator">&lt;</span> <span class="number">30</span>) { <span class="comment">// Initial value</span>
          randomValue <span class="operator">=</span> <span class="number">55</span> <span class="operator">+</span> <span class="type">QRandomGenerator</span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">30</span>);
      } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="operator">!</span>m_measuring) { <span class="comment">// Value when relax</span>
          randomValue <span class="operator">=</span> qBound(<span class="number">55</span><span class="operator">,</span> m_currentValue <span class="operator">-</span> <span class="number">2</span> <span class="operator">+</span> <span class="type">QRandomGenerator</span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">5</span>)<span class="operator">,</span> <span class="number">75</span>);
      } <span class="keyword">else</span> { <span class="comment">// Measuring</span>
          randomValue <span class="operator">=</span> m_currentValue <span class="operator">+</span> <span class="type">QRandomGenerator</span><span class="operator">::</span>global()<span class="operator">-</span><span class="operator">&gt;</span>bounded(<span class="number">10</span>) <span class="operator">-</span> <span class="number">2</span>;
      }

      addMeasurement(randomValue);
  }
  <span class="preprocessor">#endif</span>

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>confirmedDescriptorWrite(<span class="keyword">const</span> <span class="type"><a href="qlowenergydescriptor.html">QLowEnergyDescriptor</a></span> <span class="operator">&amp;</span>d<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QByteArray</span> <span class="operator">&amp;</span>value)
  {
      <span class="keyword">if</span> (d<span class="operator">.</span>isValid() <span class="operator">&amp;</span><span class="operator">&amp;</span> d <span class="operator">=</span><span class="operator">=</span> m_notificationDesc <span class="operator">&amp;</span><span class="operator">&amp;</span> value <span class="operator">=</span><span class="operator">=</span> <span class="type">QByteArray</span><span class="operator">::</span>fromHex(<span class="string">&quot;0000&quot;</span>)) {
          <span class="comment">//disabled notifications -&gt; assume disconnect intent</span>
          m_control<span class="operator">-</span><span class="operator">&gt;</span>disconnectFromDevice();
          <span class="keyword">delete</span> m_service;
          m_service <span class="operator">=</span> nullptr;
      }
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>disconnectService()
  {
      m_foundHeartRateService <span class="operator">=</span> <span class="keyword">false</span>;

      <span class="comment">//disable notifications</span>
      <span class="keyword">if</span> (m_notificationDesc<span class="operator">.</span>isValid() <span class="operator">&amp;</span><span class="operator">&amp;</span> m_service
              <span class="operator">&amp;</span><span class="operator">&amp;</span> m_notificationDesc<span class="operator">.</span>value() <span class="operator">=</span><span class="operator">=</span> <span class="type">QByteArray</span><span class="operator">::</span>fromHex(<span class="string">&quot;0100&quot;</span>)) {
          m_service<span class="operator">-</span><span class="operator">&gt;</span>writeDescriptor(m_notificationDesc<span class="operator">,</span> <span class="type">QByteArray</span><span class="operator">::</span>fromHex(<span class="string">&quot;0000&quot;</span>));
      } <span class="keyword">else</span> {
          <span class="keyword">if</span> (m_control)
              m_control<span class="operator">-</span><span class="operator">&gt;</span>disconnectFromDevice();

          <span class="keyword">delete</span> m_service;
          m_service <span class="operator">=</span> nullptr;
      }
  }

  bool DeviceHandler<span class="operator">::</span>measuring() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_measuring;
  }

  bool DeviceHandler<span class="operator">::</span>alive() <span class="keyword">const</span>
  {
  <span class="preprocessor">#ifdef SIMULATOR</span>
      <span class="keyword">return</span> <span class="keyword">true</span>;
  <span class="preprocessor">#endif</span>

      <span class="keyword">if</span> (m_service)
          <span class="keyword">return</span> m_service<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qlowenergyservice.html">QLowEnergyService</a></span><span class="operator">::</span>ServiceDiscovered;

      <span class="keyword">return</span> <span class="keyword">false</span>;
  }

  <span class="type">int</span> DeviceHandler<span class="operator">::</span>hr() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_currentValue;
  }

  <span class="type">int</span> DeviceHandler<span class="operator">::</span>time() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_start<span class="operator">.</span>secsTo(m_stop);
  }

  <span class="type">int</span> DeviceHandler<span class="operator">::</span>maxHR() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_max;
  }

  <span class="type">int</span> DeviceHandler<span class="operator">::</span>minHR() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_min;
  }

  <span class="type">float</span> DeviceHandler<span class="operator">::</span>average() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_avg;
  }

  <span class="type">float</span> DeviceHandler<span class="operator">::</span>calories() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> m_calories;
  }

  <span class="type">void</span> DeviceHandler<span class="operator">::</span>addMeasurement(<span class="type">int</span> value)
  {
      m_currentValue <span class="operator">=</span> value;

      <span class="comment">// If measuring and value is appropriate</span>
      <span class="keyword">if</span> (m_measuring <span class="operator">&amp;</span><span class="operator">&amp;</span> value <span class="operator">&gt;</span> <span class="number">30</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> value <span class="operator">&lt;</span> <span class="number">250</span>) {

          m_stop <span class="operator">=</span> <span class="type">QDateTime</span><span class="operator">::</span>currentDateTime();
          m_measurements <span class="operator">&lt;</span><span class="operator">&lt;</span> value;

          m_min <span class="operator">=</span> m_min <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">?</span> value : qMin(value<span class="operator">,</span> m_min);
          m_max <span class="operator">=</span> qMax(value<span class="operator">,</span> m_max);
          m_sum <span class="operator">+</span><span class="operator">=</span> value;
          m_avg <span class="operator">=</span> (<span class="type">double</span>)m_sum <span class="operator">/</span> m_measurements<span class="operator">.</span>size();
          m_calories <span class="operator">=</span> ((<span class="operator">-</span><span class="number">55.0969</span> <span class="operator">+</span> (<span class="number">0.6309</span> <span class="operator">*</span> m_avg) <span class="operator">+</span> (<span class="number">0.1988</span> <span class="operator">*</span> <span class="number">94</span>) <span class="operator">+</span> (<span class="number">0.2017</span> <span class="operator">*</span> <span class="number">24</span>)) <span class="operator">/</span> <span class="number">4.184</span>) <span class="operator">*</span> <span class="number">60</span> <span class="operator">*</span> time()<span class="operator">/</span><span class="number">3600</span>;
      }

      <span class="keyword">emit</span> statsChanged();
  }

</pre>
</div>
<!-- @@@heartrate-game/devicehandler.cpp -->
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   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
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