QGraphicsItemAnimation Class

      QGraphicsItem *ball = new QGraphicsEllipseItem(0, 0, 20, 20);

      QTimeLine *timer = new QTimeLine(5000);
      timer->setFrameRange(0, 100);

      QGraphicsItemAnimation *animation = new QGraphicsItemAnimation;
      animation->setItem(ball);
      animation->setTimeLine(timer);

      for (int i = 0; i < 200; ++i)
          animation->setPosAt(i / 200.0, QPointF(i, i));

      QGraphicsScene *scene = new QGraphicsScene();
      scene->setSceneRect(0, 0, 250, 250);
      scene->addItem(ball);

      QGraphicsView *view = new QGraphicsView(scene);
      view->show();

      timer->start();

成员函数

QGraphicsItemAnimation::QGraphicsItemAnimation(QObject *parent = Q_NULLPTR)

Constructs an animation object with the given parent.

[virtual] QGraphicsItemAnimation::~QGraphicsItemAnimation()

Destroys the animation object.

[virtual protected] void QGraphicsItemAnimation::afterAnimationStep(qreal step)

This method is meant to be overridden in subclasses that need to execute additional code after a new step has taken place. The animation step is provided for use in cases where the action depends on its value.

[virtual protected] void QGraphicsItemAnimation::beforeAnimationStep(qreal step)

This method is meant to be overridden by subclassed that needs to execute additional code before a new step takes place. The animation step is provided for use in cases where the action depends on its value.

void QGraphicsItemAnimation::clear()

Clears the scheduled transformations used for the animation, but retains the item and timeline.

qreal QGraphicsItemAnimation::horizontalScaleAt(qreal step) const

Returns the horizontal scale for the item at the specified step value.

参见 setScaleAt().

qreal QGraphicsItemAnimation::horizontalShearAt(qreal step) const

Returns the horizontal shear for the item at the specified step value.

参见 setShearAt().

QGraphicsItem *QGraphicsItemAnimation::item() const

Returns the item on which the animation object operates.

参见 setItem().

QMatrix QGraphicsItemAnimation::matrixAt(qreal step) const

Returns the matrix used to transform the item at the specified step value.

QPointF QGraphicsItemAnimation::posAt(qreal step) const

Returns the position of the item at the given step value.

参见 setPosAt().

QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::posList() const

Returns all explicitly inserted positions.

参见 posAt() and setPosAt().

qreal QGraphicsItemAnimation::rotationAt(qreal step) const

Returns the angle at which the item is rotated at the specified step value.

参见 setRotationAt().

QList<QPair<qreal, qreal> > QGraphicsItemAnimation::rotationList() const

Returns all explicitly inserted rotations.

参见 rotationAt() and setRotationAt().

QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::scaleList() const

Returns all explicitly inserted scales.

参见 verticalScaleAt(), horizontalScaleAt(), and setScaleAt().

void QGraphicsItemAnimation::setItem(QGraphicsItem *item)

Sets the specified item to be used in the animation.

参见 item().

void QGraphicsItemAnimation::setPosAt(qreal step, const QPointF &point)

Sets the position of the item at the given step value to the point specified.

参见 posAt().

void QGraphicsItemAnimation::setRotationAt(qreal step, qreal angle)

Sets the rotation of the item at the given step value to the angle specified.

参见 rotationAt().

void QGraphicsItemAnimation::setScaleAt(qreal step, qreal sx, qreal sy)

Sets the scale of the item at the given step value using the horizontal and vertical scale factors specified by sx and sy.

参见 verticalScaleAt() and horizontalScaleAt().

void QGraphicsItemAnimation::setShearAt(qreal step, qreal sh, qreal sv)

Sets the shear of the item at the given step value using the horizontal and vertical shear factors specified by sh and sv.

参见 verticalShearAt() and horizontalShearAt().

[slot] void QGraphicsItemAnimation::setStep(qreal step)

Sets the current step value for the animation, causing the transformations scheduled at this step to be performed.

void QGraphicsItemAnimation::setTimeLine(QTimeLine *timeLine)

Sets the timeline object used to control the rate of animation to the timeLine specified.

参见 timeLine().

void QGraphicsItemAnimation::setTranslationAt(qreal step, qreal dx, qreal dy)

Sets the translation of the item at the given step value using the horizontal and vertical coordinates specified by dx and dy.

参见 xTranslationAt() and yTranslationAt().

QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::shearList() const

Returns all explicitly inserted shears.

参见 verticalShearAt(), horizontalShearAt(), and setShearAt().

QTimeLine *QGraphicsItemAnimation::timeLine() const

Returns the timeline object used to control the rate at which the animation occurs.

参见 setTimeLine().

QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::translationList() const

Returns all explicitly inserted translations.

参见 xTranslationAt(), yTranslationAt(), and setTranslationAt().

qreal QGraphicsItemAnimation::verticalScaleAt(qreal step) const

Returns the vertical scale for the item at the specified step value.

参见 setScaleAt().

qreal QGraphicsItemAnimation::verticalShearAt(qreal step) const

Returns the vertical shear for the item at the specified step value.

参见 setShearAt().

qreal QGraphicsItemAnimation::xTranslationAt(qreal step) const

Returns the horizontal translation of the item at the specified step value.

参见 setTranslationAt().

qreal QGraphicsItemAnimation::yTranslationAt(qreal step) const

Returns the vertical translation of the item at the specified step value.

参见 setTranslationAt().