qgraphicsitemanimation.cpp

奇趣公司比较新的qt/emd版本

    QMatrix matrix;
    if (!d->rotation.isEmpty())
        matrix.rotate(rotationAt(step));
    if (!d->verticalScale.isEmpty())
        matrix.scale(horizontalScaleAt(step), verticalScaleAt(step));
    if (!d->verticalShear.isEmpty())
        matrix.shear(horizontalShearAt(step), verticalShearAt(step));
    if (!d->xTranslation.isEmpty())
        matrix.translate(xTranslationAt(step), yTranslationAt(step));
    return matrix;
}

/*!
  Returns the angle at which the item is rotated at the specified \a step value.

  \sa setRotationAt()
*/
qreal QGraphicsItemAnimation::rotationAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::rotationAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->rotation);
}

/*!
  Sets the rotation of the item at the given \a step value to the \a angle specified.

  \sa rotationAt()
*/
void QGraphicsItemAnimation::setRotationAt(qreal step, qreal angle)
{
    d->insertUniquePair(step, angle, &d->rotation, "setRotationAt");
}

/*!
  Returns all explicitly inserted rotations.

  \sa rotationAt(), setRotationAt()
*/
QList<QPair<qreal, qreal> > QGraphicsItemAnimation::rotationList() const
{
    QList<QPair<qreal, qreal> > list;
    for (int i = 0; i < d->rotation.size(); ++i)
        list << QPair<qreal, qreal>(d->rotation.at(i).step, d->rotation.at(i).value);
    
    return list;
}

/*!
  Returns the horizontal translation of the item at the specified \a step value.

  \sa setTranslationAt()
*/
qreal QGraphicsItemAnimation::xTranslationAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::xTranslationAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->xTranslation);
}

/*!
  Returns the vertical translation of the item at the specified \a step value.

  \sa setTranslationAt()
*/
qreal QGraphicsItemAnimation::yTranslationAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::yTranslationAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->yTranslation);
}

/*!
  Sets the translation of the item at the given \a step value using the horizontal
  and vertical coordinates specified by \a dx and \a dy.

  \sa xTranslationAt(), yTranslationAt()
*/
void QGraphicsItemAnimation::setTranslationAt(qreal step, qreal dx, qreal dy)
{
    d->insertUniquePair(step, dx, &d->xTranslation, "setTranslationAt");
    d->insertUniquePair(step, dy, &d->yTranslation, "setTranslationAt");
}

/*!
  Returns all explicitly inserted translations.

  \sa xTranslationAt(), yTranslationAt(), setTranslationAt()
*/
QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::translationList() const
{
    QList<QPair<qreal, QPointF> > list;
    for (int i = 0; i < d->xTranslation.size(); ++i)
        list << QPair<qreal, QPointF>(d->xTranslation.at(i).step, QPointF(d->xTranslation.at(i).value, d->yTranslation.at(i).value));
    
    return list;
}

/*!
  Returns the vertical scale for the item at the specified \a step value.

  \sa setScaleAt()
*/
qreal QGraphicsItemAnimation::verticalScaleAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::verticalScaleAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->verticalScale, 1);
}

/*!
  Returns the horizontal scale for the item at the specified \a step value.

  \sa setScaleAt()
*/
qreal QGraphicsItemAnimation::horizontalScaleAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::horizontalScaleAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->horizontalScale, 1);
}

/*!
  Sets the scale of the item at the given \a step value using the horizontal and
  vertical scale factors specified by \a sx and \a sy.

  \sa verticalScaleAt(), horizontalScaleAt()
*/
void QGraphicsItemAnimation::setScaleAt(qreal step, qreal sx, qreal sy)
{
    d->insertUniquePair(step, sx, &d->horizontalScale, "setScaleAt");
    d->insertUniquePair(step, sy, &d->verticalScale, "setScaleAt");
}

/*!
  Returns all explicitly inserted scales.

  \sa verticalScaleAt(), horizontalScaleAt(), setScaleAt()
*/
QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::scaleList() const
{
    QList<QPair<qreal, QPointF> > list;
    for (int i = 0; i < d->horizontalScale.size(); ++i)
        list << QPair<qreal, QPointF>(d->horizontalScale.at(i).step, QPointF(d->horizontalScale.at(i).value, d->verticalScale.at(i).value));
    
    return list;
}

/*!
  Returns the vertical shear for the item at the specified \a step value.

  \sa setShearAt()
*/
qreal QGraphicsItemAnimation::verticalShearAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::verticalShearAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->verticalShear, 0);
}

/*!
  Returns the horizontal shear for the item at the specified \a step value.

  \sa setShearAt()
*/
qreal QGraphicsItemAnimation::horizontalShearAt(qreal step) const
{
    if (step < 0.0 || step > 1.0)
        qWarning("QGraphicsItemAnimation::horizontalShearAt: invalid step = %f", step);

    return d->linearValueForStep(step, &d->horizontalShear, 0);
}

/*!
  Sets the shear of the item at the given \a step value using the horizontal and
  vertical shear factors specified by \a sh and \a sv.

  \sa verticalShearAt(), horizontalShearAt()
*/
void QGraphicsItemAnimation::setShearAt(qreal step, qreal sh, qreal sv)
{
    d->insertUniquePair(step, sh, &d->horizontalShear, "setShearAt");
    d->insertUniquePair(step, sv, &d->verticalShear, "setShearAt");
}

/*!
  Returns all explicitly inserted shears.

  \sa verticalShearAt(), horizontalShearAt(), setShearAt()
*/
QList<QPair<qreal, QPointF> > QGraphicsItemAnimation::shearList() const
{
    QList<QPair<qreal, QPointF> > list;
    for (int i = 0; i < d->horizontalShear.size(); ++i)
        list << QPair<qreal, QPointF>(d->horizontalShear.at(i).step, QPointF(d->horizontalShear.at(i).value, d->verticalShear.at(i).value));
    
    return list;
}

/*!
  Clears the scheduled transformations used for the animation, but
  retains the item and timeline.
*/
void QGraphicsItemAnimation::clear()
{
    d->xPosition.clear();
    d->yPosition.clear();
    d->rotation.clear();
    d->verticalScale.clear();
    d->horizontalScale.clear();
    d->verticalShear.clear();
    d->horizontalShear.clear();
    d->xTranslation.clear();
    d->yTranslation.clear();
}

/*!
  \fn void QGraphicsItemAnimation::setStep(qreal step)

  Sets the current \a step value for the animation, causing the
  transformations scheduled at this step to be performed.
*/
void QGraphicsItemAnimation::setStep(qreal x)
{
    if (x < 0.0 || x > 1.0) {
        qWarning("QGraphicsItemAnimation::setStep: invalid step = %f", x);
        return;
    }

    beforeAnimationStep(x);

    d->step = x;
    if (d->item) {
        if (!d->xPosition.isEmpty() || !d->yPosition.isEmpty())
            d->item->setPos(posAt(x));
        if (!d->rotation.isEmpty()
            || !d->verticalScale.isEmpty()
            || !d->horizontalScale.isEmpty()
            || !d->verticalShear.isEmpty()
            || !d->horizontalShear.isEmpty()
            || !d->xTranslation.isEmpty()
            || !d->yTranslation.isEmpty()) {
            d->item->setMatrix(d->startMatrix * matrixAt(x));
        }
    }

    afterAnimationStep(x);
}

/*!
Resets the item to its starting position and transformation.
*/
void QGraphicsItemAnimation::reset()
{
    if (!d->item)
        return;
    d->startPos = d->item->pos();
    d->startMatrix = d->item->matrix();
}

/*!
  \fn 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 \a step is provided for use in cases where the action
  depends on its value.
*/
void QGraphicsItemAnimation::beforeAnimationStep(qreal step)
{
    Q_UNUSED(step);
}

/*!
  \fn 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 \a step is provided for use in cases where the action
  depends on its value.
*/
void QGraphicsItemAnimation::afterAnimationStep(qreal step)
{
    Q_UNUSED(step);
}

#endif // QT_NO_GRAPHICSVIEW