对animatedtiles的注释，学习状态机的好办法 [复制链接]

昨天下了个4.6.2 对QT的动画很感兴趣，特别是状态机开发框架的引入，花了一天的时间来查资料，终于有一点点进展。以下是我对animatedtiles的注释希望大家指正
int main()
{
    Q_INIT_RESOURCE(animatedtiles);

    QApplication app(argc, argv);

    QPixmap kineticPix(":/images/kinetic.png");
    QPixmap bgPix(":/images/Time-For-Lunch-2.jpg");

    QGraphicsScene scene(-350, -350, 700, 700);
    //生成64个对象
    QList<Pixmap *> items;
    for (int i = 0; i < 64; ++i) {
        Pixmap *item = new Pixmap(kineticPix);
        item->setOffset(-kineticPix.width()/2, -kineticPix.height()/2);
        item->setZValue(i);
        items << item;
        scene.addItem(item);
    }

    // Buttons
    QGraphicsItem *buttonParent = new QGraphicsRectItem;
    Button *ellipseButton = new Button(QPixmap(":/images/ellipse.png"), buttonParent);
    Button *figure8Button = new Button(QPixmap(":/images/figure8.png"), buttonParent);
    Button *randomButton = new Button(QPixmap(":/images/random.png"), buttonParent);
    Button *tiledButton = new Button(QPixmap(":/images/tile.png"), buttonParent);
    Button *centeredButton = new Button(QPixmap(":/images/centered.png"), buttonParent);

    ellipseButton->setPos(-100, -100);
    figure8Button->setPos(100, -100);
    randomButton->setPos(0, 0);
    tiledButton->setPos(-100, 100);
    centeredButton->setPos(100, 100);

    scene.addItem(buttonParent);
    buttonParent->scale(0.75, 0.75);
    buttonParent->setPos(200, 200);
    buttonParent->setZValue(65);

    // States //定义状态
    QState *rootState = new QState;  //根状态
    QState *ellipseState = new QState(rootState);
    QState *figure8State = new QState(rootState);
    QState *randomState = new QState(rootState);
    QState *tiledState = new QState(rootState);
    QState *centeredState = new QState(rootState);

    // Values
    //定义64个对象的位置，并定义初始状态 5种每个目标的位置
    for (int i = 0; i < items.count(); ++i) {
        Pixmap *item = items.at(i);
        // Ellipse
        ellipseState->assignProperty(item, "pos",
                                         QPointF(cos((i / 63.0) * 6.28) * 250,
                                                 sin((i / 63.0) * 6.28) * 250));

        // Figure 8
        figure8State->assignProperty(item, "pos",
                                         QPointF(sin((i / 63.0) * 6.28) * 250,
                                                 sin(((i * 2)/63.0) * 6.28) * 250));

        // Random
        randomState->assignProperty(item, "pos",
                                        QPointF(-250 + qrand() % 500,
                                                -250 + qrand() % 500));

        // Tiled
        tiledState->assignProperty(item, "pos",
                                       QPointF(((i % 8) - 4) * kineticPix.width() + kineticPix.width() / 2,
                                               ((i / 8) - 4) * kineticPix.height() + kineticPix.height() / 2));

        // Centered
        centeredState->assignProperty(item, "pos", QPointF());
    }

    // Ui
    View *view = new View(&scene);
    view->setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Animated Tiles"));
    view->setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
    view->setBackgroundBrush(bgPix);
    view->setCacheMode(QGraphicsView::CacheBackground);
    view->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
    view->show();

    QStateMachine states; //定义状态机
    states.addState(rootState); //加入初始状态
    states.setInitialState(rootState);
    rootState->setInitialState(centeredState);//定义第一个状态为中心

    QParallelAnimationGroup *group = new QParallelAnimationGroup;//生成并行动画模式
    for (int i = 0; i < items.count(); ++i) {
        QPropertyAnimation *anim = new QPropertyAnimation(items, "pos");//设定动画对象
        anim->setDuration(750 + i * 25); //定义每个动画运动时间
        anim->setEasingCurve(QEasingCurve::InOutBack);//定义动画值的变化趋势pos值*系数
        group->addAnimation(anim);  //将动画对象加入动画组 64个对象同时运动
    }
    //提交press信号 从当前状态变换为ellipseState动作
    QAbstractTransition *trans = rootState->addTransition(ellipseButton, SIGNAL(pressed()), ellipseState);
    trans->addAnimation(group);

    trans = rootState->addTransition(figure8Button, SIGNAL(pressed()), figure8State);
    trans->addAnimation(group);

    trans = rootState->addTransition(randomButton, SIGNAL(pressed()), randomState);
    trans->addAnimation(group);

    trans = rootState->addTransition(tiledButton, SIGNAL(pressed()), tiledState);
    trans->addAnimation(group);

    trans = rootState->addTransition(centeredButton, SIGNAL(pressed()), centeredState);
    trans->addAnimation(group);

    QTimer timer;
    timer.start(125);
    timer.setSingleShot(true);
    trans = rootState->addTransition(&timer, SIGNAL(timeout()), ellipseState);
    trans->addAnimation(group);

    states.start();

...
}

不错，顶一个！