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50
51//Own
52#include "torpedo.h"
53#include "boat.h"
54#include "graphicsscene.h"
55#include "animationmanager.h"
56#include "qanimationstate.h"
57
58#include <QPropertyAnimation>
59#include <QStateMachine>
60#include <QFinalState>
61
62Torpedo::Torpedo() : PixmapItem(QString::fromLatin1(str: "torpedo"),GraphicsScene::Big),
63 currentSpeed(0)
64{
65 setZValue(2);
66}
67
68void Torpedo::launch()
69{
70 QPropertyAnimation *launchAnimation = new QPropertyAnimation(this, "pos");
71 AnimationManager::self()->registerAnimation(anim: launchAnimation);
72 launchAnimation->setEndValue(QPointF(x(), qobject_cast<GraphicsScene *>(object: scene())->sealLevel() - 15));
73 launchAnimation->setEasingCurve(QEasingCurve::InQuad);
74 launchAnimation->setDuration(y() / currentSpeed * 10);
75 connect(sender: launchAnimation, signal: &QVariantAnimation::valueChanged, receiver: this, slot: &Torpedo::onAnimationLaunchValueChanged);
76 connect(sender: this, signal: &Torpedo::torpedoExploded, receiver: launchAnimation, slot: &QAbstractAnimation::stop);
77
78 //We setup the state machine of the torpedo
79 QStateMachine *machine = new QStateMachine(this);
80
81 //This state is when the launch animation is playing
82 QAnimationState *launched = new QAnimationState(machine);
83 launched->setAnimation(launchAnimation);
84
85 //End
86 QFinalState *finalState = new QFinalState(machine);
87
88 machine->setInitialState(launched);
89
90 //### Add a nice animation when the torpedo is destroyed
91 launched->addTransition(obj: this, signal: &Torpedo::torpedoExploded, target: finalState);
92
93 //If the animation is finished, then we move to the final state
94 launched->addTransition(obj: launched, signal: &QAnimationState::animationFinished, target: finalState);
95
96 //The machine has finished to be executed, then the boat is dead
97 connect(sender: machine, signal: &QState::finished, receiver: this, slot: &Torpedo::torpedoExecutionFinished);
98
99 machine->start();
100}
101
102void Torpedo::setCurrentSpeed(int speed)
103{
104 if (speed < 0) {
105 qWarning(msg: "Torpedo::setCurrentSpeed : The speed is invalid");
106 return;
107 }
108 currentSpeed = speed;
109}
110
111void Torpedo::onAnimationLaunchValueChanged(const QVariant &)
112{
113 const QList<QGraphicsItem *> colItems =
114 collidingItems(mode: Qt::IntersectsItemBoundingRect);
115 for (QGraphicsItem *item : colItems) {
116 if (Boat *b = qgraphicsitem_cast<Boat*>(item))
117 b->destroy();
118 }
119}
120
121void Torpedo::destroy()
122{
123 emit torpedoExploded();
124}
125

source code of qtbase/examples/widgets/animation/sub-attaq/torpedo.cpp