89 lines
1.5 KiB
Text
89 lines
1.5 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Pmulpre}
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multiplies with value of a key in event stream, before it is passed up@section{related}
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Classes/Pmul, Classes/Pmulp
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@section{categories}
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Streams-Patterns-Events>Patterns>Math
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@section{description}
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Multiplies with a value in an event, strong::before it is passed up:: the stream. To multiply with the value after it has been passed down, use link::Classes/Pmul::.
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@racketblock[
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(
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var a, b;
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a = Pmulpre(\note, 2, Pbind(\note, Pseq([1, 2, 3])));
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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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::
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Pmulpre does not override incoming values:
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]
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@racketblock[
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(
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var a, b;
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a = Pmulpre(\freq, 801, Pset(\freq, 500, Pbind(\dur, 0.2)));
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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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::
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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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@section{argument}
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name
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@section{argument}
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value
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can be a pattern or a stream. The resulting stream ends when that incoming stream ends.
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@section{argument}
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pattern
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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 = Pmulpre(\freq, Pseq([401, 801], 2), Pbind(\dur, 0.5));
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x = a.asStream;
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9.do({ x.next(Event.new).postln; });
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)
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::
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]
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@racketblock[
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//sound example
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(
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SynthDef(\sinegrain,
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{ arg out=0, freq=440, sustain=0.02;
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var env;
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env = EnvGen.kr(Env.perc(0.001, sustain), 1, doneAction: Done.freeSelf);
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Out.ar(out, SinOsc.ar(freq, 0, env * 0.1))
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}).add;
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)
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(
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a = Pbind(\dur, 0.5, \instrument, \sinegrain);
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b = Pmulpre(\freq, Pseq([1, 2, 3], inf), a);
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b.play;
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)
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::
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]
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