This has a bunch of good information. https://thorwil.wordpress.com/2007/05/01/fan-sliders/ I'll try to get some time this weekend to formulate a considered reply. Immanuel
On Tue, May 16, 2017 at 9:25 AM, Christopher Arndt <ch...@chrisarndt.de> wrote: > Hi all, > > I'm currently trying to write a software MIDI/OSC control panel in > Kivy/Python [1]. I want to implement a sensible knob behaviour but I > have trouble getting this right. The general idea is: > > - Click (starting somewhere in the area of the knob control) and drag > upwards/downwards (y-axis) increases / decreases the value. > - Dragging left/right (x-axis) decreases step size of increments / > decrements. > - Each knob has a min/max value. > > My questions are: > > - What should I use as the reference point for finding the distance of > the movement? The centre of the knob or where the first touch event > occurred? > - Should I apply the distance to the value directly or use the distance > as a relative value (i.e. increment / decrement to the value when the > touch started)? If the former, how do I prevent value jumps? > > - Or, to put it another way: how do you guys actually implement knob > behaviour? > > > Chris > > > > [1] http://kivy.org/ > > > _______________________________________________ > Linux-audio-dev mailing list > Linux-audio-dev@lists.linuxaudio.org > http://lists.linuxaudio.org/listinfo/linux-audio-dev > >
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