85 lines
1.4 KiB
Text
85 lines
1.4 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Prorate}
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divide stream proportionally@section{related}
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Classes/Pattern
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@section{categories}
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Streams-Patterns-Events>Patterns>Math
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@section{ClassMethods}
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@section{method}
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new
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@section{argument}
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proportion
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a pattern that returns either numbers (divides the pattern into pairs) or arrays of size n which are used to split up the input into n parts.
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@section{argument}
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pattern
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a numerical pattern.
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@section{Examples}
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@racketblock[
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// divide 1 into various proportions
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(
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a = Prorate(Pseq([0.35, 0.5, 0.8]), 1);
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x = a.asStream;
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x.nextN(8)
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)
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// divide a pattern into various proportions
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(
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a = Prorate(Pseq([0.35, 0.5, 0.8]), Prand([20, 1], inf));
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x = a.asStream;
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x.nextN(8)
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)
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// divide 1 into several parts
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(
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a = Prorate(Pseq([[1, 2], [5, 7], [4, 8, 9]]).collect(_.normalizeSum), 1);
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x = a.asStream;
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x.nextN(8)
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)
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// sound example
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(
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SynthDef(\help_sinegrain,
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{ arg out=0, freq=440, sustain=0.05;
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var env;
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env = EnvGen.kr(Env.perc(0.01, sustain, 0.2), doneAction: Done.freeSelf);
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Out.ar(out, SinOsc.ar(freq, 0, env))
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}).add;
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)
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(
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var a, x;
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a = Prorate(
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Prand([2/3, 1/3, [0.3, 0.3, 0.4], [0.6, 0.4]], inf),
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Pseq([1, 2, 1, 3, 12], inf)
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);
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3.do {
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{
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var x = a.asStream;
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var freq = rrand(72, 84).midicps;
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loop {
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Synth(\help_sinegrain, [\freq, freq]);
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(0.25 * x.next).wait;
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}
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}.fork;
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};
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)
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::
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]
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