62 lines
1.5 KiB
Text
62 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{Dconst}
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Constrain a demand-rate stream to a given sum@section{categories}
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UGens>Demand
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@section{description}
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A demand-rate analog to link::Classes/Pconst::. It outputs values from the child demand stream until the sum of those values reaches or exceeds a given total. The last value will be truncated so that the sum of Dconst's output values will match the total exactly.
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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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sum
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The sum to reach. This may be a number, demand UGen or any other UGen. When a Dconst instance resets, one value will be taken for the sum, and it can't be modulated until the next reset.
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@section{ARGUMENT}
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in
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A demand-rate stream, providing the output values.
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@section{ARGUMENT}
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tolerance
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Because of floating point rounding error, it isn't safe to stop only when the output's running sum is equal to the desired total. teletype::tolerance:: is how close the running sum can get to stop the output:
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@racketblock[abs(runningsum - sum) <= tolerance::.
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]
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@section{returns}
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A demand-rate stream.
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@section{EXAMPLES}
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@racketblock[
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// fast notes of random duration for 0.5 seconds
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// then a single note for 0.5 seconds
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(
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a = {
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var freq = Duty.kr(
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Dseq([
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Dconst(0.5, Dwhite(0.05, 0.08, inf)),
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0.5
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], inf),
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0,
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// workaround for the lack of Dexprand
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Dwhite(0, 1, inf).linexp(0, 1, 200, 600)
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);
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VarSaw.ar(Lag.kr(freq, 0.02), 0, 0.3, 0.1).dup
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}.play;
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)
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a.free;
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]
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