demos/sub-attaq/torpedo.cpp

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  41
  42 //Own
  43 #include "torpedo.h"
  44 #include "pixmapitem.h"
  45 #include "boat.h"
  46 #include "graphicsscene.h"
  47 #include "animationmanager.h"
  48 #include "qanimationstate.h"
  49
  50 #include <QtCore/QPropertyAnimation>
  51 #include <QtCore/QStateMachine>
  52 #include <QtCore/QFinalState>
  53
  54 Torpedo::Torpedo(QGraphicsItem * parent, Qt::WindowFlags wFlags)
  55     : QGraphicsWidget(parent,wFlags), currentSpeed(0), launchAnimation(0)
  56 {
  57     pixmapItem = new PixmapItem(QString::fromLatin1("torpedo"),GraphicsScene::Big, this);
  58     setZValue(2);
  59     setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
  60     setFlags(QGraphicsItem::ItemIsMovable);
  61     resize(pixmapItem->boundingRect().size());
  62 }
  63
  64 void Torpedo::launch()
  65 {
  66     launchAnimation = new QPropertyAnimation(this, "pos");
  67     AnimationManager::self()->registerAnimation(launchAnimation);
  68     launchAnimation->setEndValue(QPointF(x(),qobject_cast<GraphicsScene *>(scene())->sealLevel() - 15));
  69     launchAnimation->setEasingCurve(QEasingCurve::InQuad);
  70     launchAnimation->setDuration(y()/currentSpeed*10);
  71     connect(launchAnimation,SIGNAL(valueChanged(const QVariant &)),this,SLOT(onAnimationLaunchValueChanged(const QVariant &)));
  72
  73     //We setup the state machine of the torpedo
  74     QStateMachine *machine = new QStateMachine(this);
  75
  76     //This state is when the launch animation is playing
  77     QAnimationState *launched = new QAnimationState(machine);
  78     launched->setAnimation(launchAnimation);
  79
  80     //End
  81     QFinalState *final = new QFinalState(machine);
  82
  83     machine->setInitialState(launched);
  84
  85     //### Add a nice animation when the torpedo is destroyed
  86     launched->addTransition(this, SIGNAL(torpedoExplosed()),final);
  87
  88     //If the animation is finished, then we move to the final state
  89     launched->addTransition(launched, SIGNAL(animationFinished()), final);
  90
  91     //The machine has finished to be executed, then the boat is dead
  92     connect(machine,SIGNAL(finished()),this, SIGNAL(torpedoExecutionFinished()));
  93
  94     machine->start();
  95 }
  96
  97 void Torpedo::setCurrentSpeed(int speed)
  98 {
  99     if (speed < 0) {
 100         qWarning("Torpedo::setCurrentSpeed : The speed is invalid");
 101         return;
 102     }
 103     currentSpeed = speed;
 104 }
 105
 106 void Torpedo::onAnimationLaunchValueChanged(const QVariant &)
 107 {
 108     foreach (QGraphicsItem *item , collidingItems(Qt::IntersectsItemBoundingRect)) {
 109         if (item->type() == Boat::Type) {
 110             Boat *b = static_cast<Boat *>(item);
 111             b->destroy();
 112         }
 113     }
 114 }
 115
 116 void Torpedo::destroy()
 117 {
 118     launchAnimation->stop();
 119     emit torpedoExplosed();
 120 }