[linux-audio-dev] Re: Programming Synth Knobs?

On Sat, 2006-02-11 at 02:29 +0100, krampenschiesser(a)freenet.de wrote: knobs/potis/controllers? Assuming for a moment that you don't have strict memory requirements, you might want to consider loading an animation and swapping the frames when the controller is moved. There are a few implementations in qt and gtk that use this method and i've created some animations in blender (http://www.blender.org/cms/Home.2.0.html) for one based on this widget (from galan): http://cvs.sourceforge.net/viewcvs.py/galan/galan/src/gtkknob.c?rev=1.8&… The benefits: easy eye candy (pretty and complex prerendered knobs) with little or no custom drawing code (depends on the toolkit your using) easy to change the appearence by changing the animation fairly easy on the cpu The downsides: static images == a finite step resolution memory usage (probably >100K at least for a smoothly animated knob) learning to use or finding someone to use a 3d modeller or animation tool. For example, this shot shows a work in progress interface for a DSSI synth plugin. I rendered the knobs in blender with an alpha channel to get translucent shadows. The widget uses generic gtk functions to render each frame over the background as the knob is turned. It looks pretty nice in action, even if it's an eye candy overdose for some tastes. (if you dispense with the alpha and transparency, it's naturally faster) http://www.zenadsl6252.zen.co.uk/purgatory.png If you're holding out for an algorithmic solution of some kind.. ..i just wasted your time ;) Cheers, Pete. -- ====================== paugh on irc.freenode.org in #sweep, #lad kickback(a)users.sourceforge.net ======================