Re: [LAD] Implementing software knob behaviour

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 <chris@email-addr-hidden>
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/
>
>
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>
>

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Received on Tue May 16 16:15:02 2017