[Qt-interest] QTimeLine from 0 to 100, to -100 and back to 0 ?

[Oliver Demetz]

Yes, also cool. Thanks.
But without the 100:
return qSin(qreal(msec) * 2 * pi / d );

Thanks!


Sean Harmer schrieb:
> Hi,
> 
> On Friday 21 Aug 2009 10:24:29 Oliver Demetz wrote:
>> Solved,
> Cool.
> 
>> just in case someone is interested:
>>
>> class MyTimeLine : public QTimeLine
>> {
>> public:
>> 	MyTimeLine ( int duration = 1000, QObject * parent = 0 )
>>
>> 	 : QTimeLine ( duration , parent ) {}
>>
>> 	qreal valueForTime(int msec) const
>> 	{
>> 		qreal d = (qreal) duration();
>>
>> 		if (msec < d/4)
>> 		{
>> 			return 4.0 * (qreal) msec / d;
>> 		}
>> 		else if(msec < 3*d/4)
>> 		{
>> 			return - 4*msec/d + 2;
>> 		}
>> 		else
>> 		{
>> 			return 4*msec/d - 4;
>> 		}
>> 	}
>> };
> You could also have used a sine function with the appropriate period and 
> scaling. e.g.
> 
> qreal valueForTime(int msec) const
> {
> 	qreal d = (qreal) duration();
> 	return 100 * sin( qreal(msec) * 2 * pi / d );
> }
> 
> Sean
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