75 lines
1.7 KiB
Text
75 lines
1.7 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{PlazyEnvir}
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instantiate new patterns from a function@section{related}
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Classes/Plazy, Classes/PlazyEnvirN, Classes/Pfunc
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@section{categories}
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Streams-Patterns-Events>Patterns>Function
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@section{description}
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Evaluates a function that returns a pattern and embeds it in a stream. In difference to link::Classes/Plazy::, the function is evaluated using the environment passed in by the stream.
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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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func
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A link::Classes/Function:: that returns a pattern or any other valid pattern input.
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@section{Examples}
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@racketblock[
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(
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a = PlazyEnvir({ arg a=0, b=1; Pshuf([a, a, b], 2) }); // a, b default to 0,1
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x = Pn(a, inf).asStream;
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10.do { x.next.postln }; Post.nl;
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e = (a:100);
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10.do { x.next(e).postln }; Post.nl;
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e = (a:100, b:200);
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10.do { x.next(e).postln };
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)
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//PlazyEnvir used to produce a Pbind:
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(
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SynthDef(\help_sinegrain,
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{ arg out=0, freq=440, sustain=0.05, pan=0;
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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, Pan2.ar(SinOsc.ar(freq, 0, env), pan))
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}).add;
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a = PlazyEnvir({ arg g=0, h=0, dur=1;
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postf("g: %, h: %, dur: %\n", g, h, dur);
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Pbind(
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\instrument, \help_sinegrain,
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\dur, dur,
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\degree, Pseq([g, g, h, g, h], 2)
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)
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});
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)
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// different variants
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(a <> (g: 0, h: 3, dur:0.2)).play; // single stream
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(a <> (g: [0, 4], h: [3, -1], dur:0.2)).play; // same durations, two streams
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::
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For more about the composition operator ]
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@racketblock[<>:: see: link::Classes/Pchain::.
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Some parameters, like duration, cannot be used in the form of an array in the link::Classes/Pbind::. For full parallel expansion see link::Classes/PlazyEnvirN::.
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]
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