73 lines
1.4 KiB
Text
73 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{Pfin}
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limit number of events embedded in a stream@section{related}
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Classes/Pfinval, Classes/Pfindur, Classes/Pconst
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@section{categories}
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Streams-Patterns-Events>Patterns>Repetition
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@section{description}
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Limits the number of output values from the given pattern or stream. If the stream is able to output more values, Pfin will terminate it early.
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The number may be given as a constant, or calculated on the fly from a function or stream. See the "sequence of pitches" example below.
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@section{ClassMethods}
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@section{method}
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new
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embeds strong::count:: elements of the strong::pattern:: into the stream.
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@section{Examples}
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@racketblock[
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(
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var a, b;
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a = Pfin(5, Pseq(#[1, 2, 3],inf));
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b = a.asStream;
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9.do({ b.next.postln; });
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)
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//Pfin used as a sequence of pitches
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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 c, b;
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c = Pn(Pfin({ rrand(3, 5) }, Pseq([1, 2, 3, 4, 5, 6], inf) * 4 + 65), inf);
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b = c.asStream;
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Routine({
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loop({
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Synth(\help_sinegrain, [\freq, b.next.midicps]);
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0.12.wait;
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})
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}).play;
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)
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// or, more concisely:
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p = Pbind(
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\instrument, \help_sinegrain,
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\midinote, Pn(Pfin({ rrand(3, 5) }, Pseq([1, 2, 3, 4, 5, 6], inf) * 4 + 65), inf),
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\dur, 0.12
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).play;
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p.stop;
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::
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]
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