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Dynamically changing skew value of widget

#1

Since it’s not possible to dynamically create new controls in a newly loaded .orc file, what is the best way to scale a linear widget, since I cannot dynamically update the skew value? “exp” opcode? For some reason it evades me… how would I get a skew value equal to 0.2 in the widget?

#2

I’ll check the math for this tomorrow and let you know.

#3

I believe this is what Cabbage does. ( I say ‘believe’ because it’s actually all wrapped up in the JUCE Slider class. But it seems to match it. Just hit play.

#4

Sorry my math skills are not up to the task here :cold_sweat: - so to translate from js, since it’s taking a base and an exp… seems like csound exp only takes the exponent? I assume the base is always 1?

;kfilter control goes from 0-1
 ifskew = 0.2
 kfilter = exp(1/ifskew)
 kfilter scale kfilter, 5000, 80

I know this isn’t right but am I close?

#5

I’d have gone with:

;skewedValue = Math.pow((slider.value()/100), 1 / skew);

iSkew = 0.2
kValue = pow(kfilter, 1/iSkew)

:thinking:

#6

I just recently made myself this simple opcode for the same purpose, hope it helps.

opcode mapSlider, k, kiii
; scale as Cabbage sliders
kin, imin, imax, iscale xin
xout imin+(imax-imin)*kin^(1/iscale)
endop
#7

Yes - I got it working… thanks!