QTimeLine

[babu198649]

hi
i have a QGraphicsItemAnimation object which after certain period requires change of one QTimeLine(which is already set) to another QTimeLine .
if i do this then the program crashes .
is there any way to change the animations timeline .

[marcel]

How exactly do you change the time line objects? Post some code, if possible.

[babu198649]

hi
i want to reset(not restarting ) the timeline.

this code crashes

ann = new QGraphicsItemAnimation;
	timelineW = new QTimeLine(5000);
	ann->setTimeLine(timelineW);
 
	tim = new QTimeLine(1000);
	ann->setTimeLine(tim);           //resetting to new timeline
 
	ann->setPosAt(0, QPointF(800, 10));
	ann->setPosAt(1, QPointF(220, 10));
        timelineW->start();

ann = new QGraphicsItemAnimation;
	timelineW = new QTimeLine(5000);
	ann->setTimeLine(timelineW);
	
	tim = new QTimeLine(1000);
	ann->setTimeLine(tim);           //resetting to new timeline

	ann->setPosAt(0, QPointF(800, 10));
	ann->setPosAt(1, QPointF(220, 10));
        timelineW->start();

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[marcel]

Beacause the item deletes the previous time line(if any) when you set a new one:

void QGraphicsItemAnimation::setTimeLine(QTimeLine *timeLine)
{
    if (d->timeLine == timeLine)
        return;
    if (d->timeLine)
        delete d->timeLine;
    if (!timeLine)
        return;
    d->timeLine = timeLine;
    connect(timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(setStep(qreal)));
}

void QGraphicsItemAnimation::setTimeLine(QTimeLine *timeLine)
{
    if (d->timeLine == timeLine)
        return;
    if (d->timeLine)
        delete d->timeLine;
    if (!timeLine)
        return;
    d->timeLine = timeLine;
    connect(timeLine, SIGNAL(valueChanged(qreal)), this, SLOT(setStep(qreal)));
}

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Therefore timelineW is invalid after you set tim as the new time line.
You should call tim->start().

[babu198649]

thanks for pasting the perfect code .

[marcel]

If you want to reset the time line, why don't you use QTimeLine::setCurrentTime(0)?

[babu198649]

thanks.

If you want to reset the time line, why don't you use QTimeLine::setCurrentTime(0)?

the animation object should synchronize with the other items timer.