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() : PixmapItem(QString::fromLatin1("torpedo"),GraphicsScene::Big),
  55     currentSpeed(0)
  56 {
  57     setZValue(2);
  58 }
  59
  60 void Torpedo::launch()
  61 {
  62     QPropertyAnimation *launchAnimation = new QPropertyAnimation(this, "pos");
  63     AnimationManager::self()->registerAnimation(launchAnimation);
  64     launchAnimation->setEndValue(QPointF(x(),qobject_cast<GraphicsScene *>(scene())->sealLevel() - 15));
  65     launchAnimation->setEasingCurve(QEasingCurve::InQuad);
  66     launchAnimation->setDuration(y()/currentSpeed*10);
  67     connect(launchAnimation,SIGNAL(valueChanged(QVariant)),this,SLOT(onAnimationLaunchValueChanged(QVariant)));
  68     connect(this,SIGNAL(torpedoExploded()), launchAnimation, SLOT(stop()));
  69
  70     //We setup the state machine of the torpedo
  71     QStateMachine *machine = new QStateMachine(this);
  72
  73     //This state is when the launch animation is playing
  74     QAnimationState *launched = new QAnimationState(machine);
  75     launched->setAnimation(launchAnimation);
  76
  77     //End
  78     QFinalState *final = new QFinalState(machine);
  79
  80     machine->setInitialState(launched);
  81
  82     //### Add a nice animation when the torpedo is destroyed
  83     launched->addTransition(this, SIGNAL(torpedoExploded()),final);
  84
  85     //If the animation is finished, then we move to the final state
  86     launched->addTransition(launched, SIGNAL(animationFinished()), final);
  87
  88     //The machine has finished to be executed, then the boat is dead
  89     connect(machine,SIGNAL(finished()),this, SIGNAL(torpedoExecutionFinished()));
  90
  91     machine->start();
  92 }
  93
  94 void Torpedo::setCurrentSpeed(int speed)
  95 {
  96     if (speed < 0) {
  97         qWarning("Torpedo::setCurrentSpeed : The speed is invalid");
  98         return;
  99     }
 100     currentSpeed = speed;
 101 }
 102
 103 void Torpedo::onAnimationLaunchValueChanged(const QVariant &)
 104 {
 105     foreach (QGraphicsItem *item , collidingItems(Qt::IntersectsItemBoundingRect)) {
 106         if (Boat *b = qgraphicsitem_cast<Boat*>(item))
 107             b->destroy();
 108     }
 109 }
 110
 111 void Torpedo::destroy()
 112 {
 113     emit torpedoExploded();
 114 }