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# bearercloud.cpp Example File

network/bearercloud/bearercloud.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
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     ** modification, are permitted provided that the following conditions are
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     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     #include "bearercloud.h"
     #include "cloud.h"

     #include <QGraphicsTextItem>
     #include <QTimer>
     #include <QDateTime>
     #include <QHostInfo>

     #include <QDebug>

     #include <math.h>

     #ifndef M_PI
     #define M_PI 3.14159265358979323846
     #endif

     BearerCloud::BearerCloud(QObject *parent)
     :   QGraphicsScene(parent), timerId(0)
     {
         setSceneRect(-300, -300, 600, 600);

         qsrand(QDateTime::currentDateTime().toTime_t());

         offset[QNetworkConfiguration::Active] = 2 * M_PI * qrand() / RAND_MAX;
         offset[QNetworkConfiguration::Discovered] = offset[QNetworkConfiguration::Active] + M_PI / 6;
         offset[QNetworkConfiguration::Defined] = offset[QNetworkConfiguration::Discovered] - M_PI / 6;
         offset[QNetworkConfiguration::Undefined] = offset[QNetworkConfiguration::Undefined] + M_PI / 6;

         thisDevice = new QGraphicsTextItem(QHostInfo::localHostName());
         thisDevice->setData(0, QLatin1String("This Device"));
         thisDevice->setPos(thisDevice->boundingRect().width() / -2,
                            thisDevice->boundingRect().height() / -2);
         addItem(thisDevice);

         qreal radius = Cloud::getRadiusForState(QNetworkConfiguration::Active);
         QGraphicsEllipseItem *orbit = new QGraphicsEllipseItem(-radius, -radius, 2*radius, 2*radius);
         orbit->setPen(QColor(Qt::green));
         addItem(orbit);
         radius = Cloud::getRadiusForState(QNetworkConfiguration::Discovered);
         orbit = new QGraphicsEllipseItem(-radius, -radius, 2*radius, 2*radius);
         orbit->setPen(QColor(Qt::blue));
         addItem(orbit);
         radius = Cloud::getRadiusForState(QNetworkConfiguration::Defined);
         orbit = new QGraphicsEllipseItem(-radius, -radius, 2*radius, 2*radius);
         orbit->setPen(QColor(Qt::darkGray));
         addItem(orbit);
         radius = Cloud::getRadiusForState(QNetworkConfiguration::Undefined);
         orbit = new QGraphicsEllipseItem(-radius, -radius, 2*radius, 2*radius);
         orbit->setPen(QColor(Qt::lightGray));
         addItem(orbit);

         connect(&manager, SIGNAL(configurationAdded(QNetworkConfiguration)),
                 this, SLOT(configurationAdded(QNetworkConfiguration)));
         connect(&manager, SIGNAL(configurationRemoved(QNetworkConfiguration)),
                 this, SLOT(configurationRemoved(QNetworkConfiguration)));
         connect(&manager, SIGNAL(configurationChanged(QNetworkConfiguration)),
                 this, SLOT(configurationChanged(QNetworkConfiguration)));

         QTimer::singleShot(0, this, SLOT(updateConfigurations()));
     }

     BearerCloud::~BearerCloud()
     {
     }

     void BearerCloud::cloudMoved()
     {
         if (!timerId)
             timerId = startTimer(1000 / 25);
     }

     void BearerCloud::timerEvent(QTimerEvent *)
     {
         QList<Cloud *> clouds;
         foreach (QGraphicsItem *item, items()) {
             if (Cloud *cloud = qgraphicsitem_cast<Cloud *>(item))
                 clouds << cloud;
         }

         foreach (Cloud *cloud, clouds)
             cloud->calculateForces();

         bool cloudsMoved = false;
         foreach (Cloud *cloud, clouds)
             cloudsMoved |= cloud->advance();

         if (!cloudsMoved) {
             killTimer(timerId);
             timerId = 0;
         }
     }

     void BearerCloud::configurationAdded(const QNetworkConfiguration &config)
     {
         const QNetworkConfiguration::StateFlags state = config.state();

         configStates.insert(state, config.identifier());

         const qreal radius = Cloud::getRadiusForState(state);
         const int count = configStates.count(state);
         const qreal angle = 2 * M_PI / count;

         Cloud *item = new Cloud(config);
         configurations.insert(config.identifier(), item);

         item->setPos(radius * cos((count-1) * angle + offset[state]),
                      radius * sin((count-1) * angle + offset[state]));

         addItem(item);

         cloudMoved();
     }

     void BearerCloud::configurationRemoved(const QNetworkConfiguration &config)
     {
         foreach (const QNetworkConfiguration::StateFlags &state, configStates.uniqueKeys())
             configStates.remove(state, config.identifier());

         Cloud *item = configurations.take(config.identifier());

         item->setFinalScale(0.0);
         item->setDeleteAfterAnimation(true);

         cloudMoved();
     }

     void BearerCloud::configurationChanged(const QNetworkConfiguration &config)
     {
         foreach (const QNetworkConfiguration::StateFlags &state, configStates.uniqueKeys())
             configStates.remove(state, config.identifier());

         configStates.insert(config.state(), config.identifier());

         cloudMoved();
     }

     void BearerCloud::updateConfigurations()
     {
         QList<QNetworkConfiguration> allConfigurations = manager.allConfigurations();

         while (!allConfigurations.isEmpty())
             configurationAdded(allConfigurations.takeFirst());

         cloudMoved();
     }