65 lines
1.4 KiB
Text
65 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{Pconst}
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constrain the sum of a value pattern@section{related}
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Classes/Pfindur, Classes/Pfin, Classes/Pfinval
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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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Similar to link::Classes/Pfindur::, but works with the value directly.
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@section{note}
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Be careful if this is used, directly or indirectly, for a note-length parameter! The difference may be very small and this could result in zombie nodes, due to a bug in link::Classes/EnvGen:: for very short sustain times.
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::
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@section{ClassMethods}
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@section{method}
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new
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Embeds elements of the strong::pattern:: into the stream until the sum comes close enough to strong::sum::. At that point, the difference between the specified sum and the actual running sum is embedded.
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@section{Examples}
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@racketblock[
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(
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var a, x;
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a = Pconst(5, Prand([1, 2, 0.5, 0.1], inf));
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x = a.asStream;
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9.do({ x.next(Event.default).postln; });
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)
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//Pconst 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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Pn(
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Pbind(
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\dur, Pconst(1, Prand([1, 0.02, 0.2], inf)),
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\instrument, \help_sinegrain,
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\degree, Pseries(0, 1, inf),
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\octave, 6
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)
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).play;
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)
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::
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]
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