touch gui element "fader" movement up/down detection?

rototom

hi coders, how to do this properly?
pseudocode:

fader(){
pv = get parameter value
v = get value from touch fader movement
if v > last_v
pv = pv + 1
else
pv = pv - 1
}

thanks:)

SevenSystems

The naive math would be:

pv = pv + (v - last_v)

But that will give you a cumulative error.

Better would be:

• when fader is first touched:

  • initial_v = v
  • initial_pv = pv

• on movement:

  • pv = initial_pv + (v - initial_v)

(assuming v is the current fader position)

rototom

exactly what i wanted!:)
thank you very much @SevenSystems