bearercloud.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the examples of the Qt Mobility Components.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "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 Digia Plc and its Subsidiary(-ies) 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
 ** "AS IS" 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."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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();
 }