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# graphicsscene.cpp Example File
demos/sub-attaq/graphicsscene.cpp

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     //Own
     #include "graphicsscene.h"
     #include "states.h"
     #include "boat.h"
     #include "submarine.h"
     #include "torpedo.h"
     #include "bomb.h"
     #include "pixmapitem.h"
     #include "animationmanager.h"
     #include "qanimationstate.h"
     #include "progressitem.h"
     #include "textinformationitem.h"

     //Qt
     #include <QtCore/QPropertyAnimation>
     #include <QtCore/QSequentialAnimationGroup>
     #include <QtCore/QParallelAnimationGroup>
     #include <QtCore/QStateMachine>
     #include <QtCore/QFinalState>
     #include <QtCore/QPauseAnimation>
     #include <QtGui/QAction>
     #include <QtCore/QDir>
     #include <QtGui/QApplication>
     #include <QtGui/QMessageBox>
     #include <QtGui/QGraphicsView>
     #include <QtGui/QGraphicsSceneMouseEvent>
     #include <QtCore/QXmlStreamReader>

     GraphicsScene::GraphicsScene(int x, int y, int width, int height, Mode mode)
         : QGraphicsScene(x , y, width, height), mode(mode), boat(new Boat)
     {
         PixmapItem *backgroundItem = new PixmapItem(QString("background"),mode);
         backgroundItem->setZValue(1);
         backgroundItem->setPos(0,0);
         addItem(backgroundItem);

         PixmapItem *surfaceItem = new PixmapItem(QString("surface"),mode);
         surfaceItem->setZValue(3);
         surfaceItem->setPos(0,sealLevel() - surfaceItem->boundingRect().height()/2);
         addItem(surfaceItem);

         //The item that display score and level
         progressItem = new ProgressItem(backgroundItem);

         textInformationItem = new TextInformationItem(backgroundItem);
         textInformationItem->hide();
         //We create the boat
         addItem(boat);
         boat->setPos(this->width()/2, sealLevel() - boat->size().height());
         boat->hide();

         //parse the xml that contain all data of the game
         QXmlStreamReader reader;
         QFile file(":data.xml");
         file.open(QIODevice::ReadOnly);
         reader.setDevice(&file);
         LevelDescription currentLevel;
         while (!reader.atEnd()) {
              reader.readNext();
              if (reader.tokenType() == QXmlStreamReader::StartElement) {
                  if (reader.name() == "submarine") {
                      SubmarineDescription desc;
                      desc.name = reader.attributes().value("name").toString();
                      desc.points = reader.attributes().value("points").toString().toInt();
                      desc.type = reader.attributes().value("type").toString().toInt();
                      submarinesData.append(desc);
                  } else if (reader.name() == "level") {
                      currentLevel.id = reader.attributes().value("id").toString().toInt();
                      currentLevel.name = reader.attributes().value("name").toString();
                  } else if (reader.name() == "subinstance") {
                      currentLevel.submarines.append(qMakePair(reader.attributes().value("type").toString().toInt(), reader.attributes().value("nb").toString().toInt()));
                  }
              } else if (reader.tokenType() == QXmlStreamReader::EndElement) {
                 if (reader.name() == "level") {
                     levelsData.insert(currentLevel.id, currentLevel);
                     currentLevel.submarines.clear();
                 }
              }
        }
     }

     qreal GraphicsScene::sealLevel() const
     {
         return (mode == Big) ? 220 : 160;
     }

     void GraphicsScene::setupScene(QAction *newAction, QAction *quitAction)
     {
         static const int nLetters = 10;
         static struct {
             char const *pix;
             qreal initX, initY;
             qreal destX, destY;
         } logoData[nLetters] = {
             {"s",   -1000, -1000, 300, 150 },
             {"u",    -800, -1000, 350, 150 },
             {"b",    -600, -1000, 400, 120 },
             {"dash", -400, -1000, 460, 150 },
             {"a",    1000,  2000, 350, 250 },
             {"t",     800,  2000, 400, 250 },
             {"t2",    600,  2000, 430, 250 },
             {"a2",    400,  2000, 465, 250 },
             {"q",     200,  2000, 510, 250 },
             {"excl",    0,  2000, 570, 220 } };

         QSequentialAnimationGroup * lettersGroupMoving = new QSequentialAnimationGroup(this);
         QParallelAnimationGroup * lettersGroupFading = new QParallelAnimationGroup(this);

         for (int i = 0; i < nLetters; ++i) {
             PixmapItem *logo = new PixmapItem(QLatin1String(":/logo-") + logoData[i].pix, this);
             logo->setPos(logoData[i].initX, logoData[i].initY);
             logo->setZValue(i + 3);
             //creation of the animations for moving letters
             QPropertyAnimation *moveAnim = new QPropertyAnimation(logo, "pos", lettersGroupMoving);
             moveAnim->setEndValue(QPointF(logoData[i].destX, logoData[i].destY));
             moveAnim->setDuration(200);
             moveAnim->setEasingCurve(QEasingCurve::OutElastic);
             lettersGroupMoving->addPause(50);
             //creation of the animations for fading out the letters
             QPropertyAnimation *fadeAnim = new QPropertyAnimation(logo, "opacity", lettersGroupFading);
             fadeAnim->setDuration(800);
             fadeAnim->setEndValue(0);
             fadeAnim->setEasingCurve(QEasingCurve::OutQuad);
         }

         QStateMachine *machine = new QStateMachine(this);

         //This state is when the player is playing
         PlayState *gameState = new PlayState(this, machine);

         //Final state
         QFinalState *final = new QFinalState(machine);

         //Animation when the player enter in the game
         QAnimationState *lettersMovingState = new QAnimationState(machine);
         lettersMovingState->setAnimation(lettersGroupMoving);

         //Animation when the welcome screen disappear
         QAnimationState *lettersFadingState = new QAnimationState(machine);
         lettersFadingState->setAnimation(lettersGroupFading);

         //if new game then we fade out the welcome screen and start playing
         lettersMovingState->addTransition(newAction, SIGNAL(triggered()), lettersFadingState);
         lettersFadingState->addTransition(lettersFadingState, SIGNAL(animationFinished()), gameState);

         //New Game is triggered then player start playing
         gameState->addTransition(newAction, SIGNAL(triggered()), gameState);

         //Wanna quit, then connect to CTRL+Q
         gameState->addTransition(quitAction, SIGNAL(triggered()), final);
         lettersMovingState->addTransition(quitAction, SIGNAL(triggered()), final);

         //Welcome screen is the initial state
         machine->setInitialState(lettersMovingState);

         machine->start();

         //We reach the final state, then we quit
         connect(machine, SIGNAL(finished()), qApp, SLOT(quit()));
     }

     void GraphicsScene::addItem(Bomb *bomb)
     {
         bombs.insert(bomb);
         connect(bomb,SIGNAL(bombExecutionFinished()),this, SLOT(onBombExecutionFinished()));
         QGraphicsScene::addItem(bomb);
     }

     void GraphicsScene::addItem(Torpedo *torpedo)
     {
         torpedos.insert(torpedo);
         connect(torpedo,SIGNAL(torpedoExecutionFinished()),this, SLOT(onTorpedoExecutionFinished()));
         QGraphicsScene::addItem(torpedo);
     }

     void GraphicsScene::addItem(SubMarine *submarine)
     {
         submarines.insert(submarine);
         connect(submarine,SIGNAL(subMarineExecutionFinished()),this, SLOT(onSubMarineExecutionFinished()));
         QGraphicsScene::addItem(submarine);
     }

     void GraphicsScene::addItem(QGraphicsItem *item)
     {
         QGraphicsScene::addItem(item);
     }

     void GraphicsScene::onBombExecutionFinished()
     {
         Bomb *bomb = qobject_cast<Bomb *>(sender());
         bombs.remove(bomb);
         bomb->deleteLater();
         if (boat)
             boat->setBombsLaunched(boat->bombsLaunched() - 1);
     }

     void GraphicsScene::onTorpedoExecutionFinished()
     {
         Torpedo *torpedo = qobject_cast<Torpedo *>(sender());
         torpedos.remove(torpedo);
         torpedo->deleteLater();
     }

     void GraphicsScene::onSubMarineExecutionFinished()
     {
         SubMarine *submarine = qobject_cast<SubMarine *>(sender());
         submarines.remove(submarine);
         if (submarines.count() == 0)
             emit allSubMarineDestroyed(submarine->points());
         else
             emit subMarineDestroyed(submarine->points());
         submarine->deleteLater();
     }

     void GraphicsScene::clearScene()
     {
         foreach (SubMarine *sub, submarines) {
             sub->destroy();
             sub->deleteLater();
         }

         foreach (Torpedo *torpedo, torpedos) {
             torpedo->destroy();
             torpedo->deleteLater();
         }

         foreach (Bomb *bomb, bombs) {
             bomb->destroy();
             bomb->deleteLater();
         }

         submarines.clear();
         bombs.clear();
         torpedos.clear();

         AnimationManager::self()->unregisterAllAnimations();

         boat->stop();
         boat->hide();
         boat->setEnabled(true);
     }