> Sent: Monday, January 29, 2018 at 5:53 PM > From: "Sze Howe Koh" <szehowe....@gmail.com> > To: "Jason H" <jh...@gmx.com> > Cc: "interestqt-project.org" <interest@qt-project.org> > Subject: Re: [Interest] How to make a looping element? > > On 30 January 2018 at 03:07, Jason H <jh...@gmx.com> wrote: > > > > This is more like a rotation.. I'm looking for the other kind of rotation > > where bearing % 360 can go from 359 to 1, without sweeping backwards while > > animating the sweep. Rather than sweep, I'd prefer to seek > > 0----90----180----270----360 > > ------>----------> increase > > <------------------ sweep back (how can I avoid this?) > > Two things come to mind: > > 1. Use relative moves instead of absolute moves. E.g. instead of "359° > to 1°", do "359° + 2°" > 2. Support values <= 0° and >= 360°. E.g. instead of "359° to 1°", do > "359° to 361°". After the animation is done, you can normalize "361°" > -> "1°" (optional)
I got a somewhat usable result by checking the delta and if over 350, it disables the animation entirely and when it falls back below 120, it re-enables. This produces a little jumpiness a few degrees around 0, but is otherwise very good. _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
