从QGraphicsObject继承的类，用QPropertyAnimation怎么实现缩放动...

majian4

如题：
我从QGraphicsObject继承类之后，自定义一个图形，然后怎么样才能用QPropertyAnimation实现缩放动画呢？

majian4

我是这么写的，结果发现不动啊
QPropertyAnimation *animation = new QPropertyAnimation(pStartPos, "scale");
    animation->setDuration(1000);
    animation->setStartValue(1);
    animation->setEndValue(0.1);
    animation->start();

任路

你好  下边是我写的测试代码，执行环境：vs2013+qt5.5.1  没有问题

1. 
   
2. class testObject: public QGraphicsObject
   
3. {
   
4. public:
   
5.         testObject() :QGraphicsObject(){}
   
6.         ~testObject(){}
   
7. 
   
8. protected:
   
9.         virtual void paint(QPainter *painter
   
10.                 , const QStyleOptionGraphicsItem *option
    
11.                 , QWidget *widget /* = Q_NULLPTR */)
    
12.         {
    
13.                 painter->drawRoundedRect(-10, -10, 20, 20, 5, 5);
    
14.         }
    
15.         virtual QRectF boundingRect() const
    
16.         {
    
17.                 qreal penWidth = 1;
    
18.                 return QRectF(-10 - penWidth / 2, -10 - penWidth / 2,
    
19.                         20 + penWidth, 20 + penWidth);
    
20.         //        return QRectF(0, 0, 100, 100);
    
21.         }
    
22. };
    
23. 
    
24. graphics::graphics(QWidget *parent)
    
25.         : QWidget(parent)
    
26. {
    
27.         ui.setupUi(this);
    
28. 
    
29.         QGraphicsScene * scene = new QGraphicsScene;
    
30.         testObject * test = new testObject;
    
31.         scene->addItem(test);
    
32. 
    
33.         ui.graphicsView->setScene(scene);
    
34. 
    
35. 
    
36.         QPropertyAnimation * animation = new QPropertyAnimation(test, "scale");
    
37.         animation->setDuration(1000);
    
38.         animation->setStartValue(1);
    
39.         animation->setEndValue(0.1);
    
40.         animation->start();
    
41. }
    
42. 
    
43. graphics::~graphics()
    
44. {
    
45. 
    
46. }
    

复制代码

任路

如果需要demo，我可以发给你

13695800360

    QPropertyAnimation *pAnimation = new QPropertyAnimation(this, "geometry");

    QDesktopWidget *pDesktopWidget = QApplication::desktop();
    int x = (pDesktopWidget->availableGeometry().width() - width()) / 2;
    int y = (pDesktopWidget->availableGeometry().height() - height()) / 2;

    pAnimation->setDuration(1000);
    pAnimation->setStartValue(QRect(x, y, 0, 0));
    pAnimation->setEndValue(QRect(0, 0, pDesktopWidget->availableGeometry().width(), pDesktopWidget->availableGeometry().height()));
    pAnimation->setEasingCurve(QEasingCurve::OutCirc);
    pAnimation->start(QAbstractAnimation:eleteWhenStopped);
    connect(pAnimation,SIGNAL(finished()),this,SLOT(showFullScreen()));