90 lines
1.4 KiB
Text
90 lines
1.4 KiB
Text
class:: LinExp
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summary:: Map a linear range to an exponential range
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related:: Classes/LinLin
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categories:: UGens>Maths
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Description::
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Converts a linear range of values to an exponential range of values.
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classmethods::
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method::ar, kr
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argument::in
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The input signal to convert.
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argument::srclo
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Lower limit of input range.
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argument::srchi
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Upper limit of input range.
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argument::dstlo
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Lower limit of output range.
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argument::dsthi
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Upper limit of output range.
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discussion::
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The code::dstlo:: and code::dsthi:: arguments
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must be nonzero and have the same sign.
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Examples::
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code::
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// compare:
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(
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{
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var mod = SinOsc.kr(Line.kr(1, 10, 10));
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SinOsc.ar(mod * 400 + 500) * 0.1
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}.play;
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)
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(
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{
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var mod = SinOsc.kr(Line.kr(1, 10, 10));
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SinOsc.ar(LinExp.kr(mod, -1,1, 100, 900)) * 0.1
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}.play;
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)
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// modulating destination values.
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(
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{
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var mod = LFNoise2.ar(80);
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SinOsc.ar(LinExp.ar(mod, -1,1, MouseX.kr(200, 8000, 1), MouseY.kr(200, 8000, 1))) * 0.1
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}.play;
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)
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::
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code::linexp:: and code::exprange:: can be used to create a LinExp implicitly from a ugen, mapping its output values from linear range to an exponential one. The rate is derived from the ugen.
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code::
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// linexp
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(
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{
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var mod = LFNoise2.ar(80);
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SinOsc.ar(mod.linexp(-1,1, MouseX.kr(200, 8000, 1), MouseY.kr(200, 8000, 1))) * 0.1
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}.play;
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)
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// exprange
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(
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{
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var mod = LFNoise2.ar(80).exprange(MouseX.kr(200, 8000, 1), MouseY.kr(200, 8000, 1));
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SinOsc.ar(mod) * 0.1
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}.play;
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)
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::
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