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();

Member Function Documentation

QGraphicsItemAnimation::QGraphicsItemAnimation(QObject *parent = nullptr)

Constructs an animation object with the given parent.

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

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

[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.

See also setScaleAt().

qreal QGraphicsItemAnimation::horizontalShearAt(qreal step) const

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

See also setShearAt().

QGraphicsItem *QGraphicsItemAnimation::item() const

Returns the item on which the animation object operates.

See also setItem().

QPointF QGraphicsItemAnimation::posAt(qreal step) const

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

See also setPosAt().

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

Returns all explicitly inserted positions.

See also posAt() and setPosAt().

qreal QGraphicsItemAnimation::rotationAt(qreal step) const

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

See also setRotationAt().

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

Returns all explicitly inserted rotations.

See also rotationAt() and setRotationAt().

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

Returns all explicitly inserted scales.

See also verticalScaleAt(), horizontalScaleAt(), and setScaleAt().

void QGraphicsItemAnimation::setItem(QGraphicsItem *item)

Sets the specified item to be used in the animation.

See also item().

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

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

See also posAt().

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

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

See also 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.

See also 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.

See also verticalShearAt() and horizontalShearAt().

void QGraphicsItemAnimation::setTimeLine(QTimeLine *timeLine)

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

See also 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.

See also xTranslationAt() and yTranslationAt().

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

Returns all explicitly inserted shears.

See also verticalShearAt(), horizontalShearAt(), and setShearAt().

QTimeLine *QGraphicsItemAnimation::timeLine() const

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

See also setTimeLine().

QTransform QGraphicsItemAnimation::transformAt(qreal step) const

Returns the transform used for the item at the specified step value.

This function was introduced in Qt 5.14.

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

Returns all explicitly inserted translations.

See also xTranslationAt(), yTranslationAt(), and setTranslationAt().

qreal QGraphicsItemAnimation::verticalScaleAt(qreal step) const

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

See also setScaleAt().

qreal QGraphicsItemAnimation::verticalShearAt(qreal step) const

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

See also setShearAt().

qreal QGraphicsItemAnimation::xTranslationAt(qreal step) const

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

See also setTranslationAt().

qreal QGraphicsItemAnimation::yTranslationAt(qreal step) const

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

See also setTranslationAt().