103 lines
1.6 KiB
Racket
103 lines
1.6 KiB
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{IndexL}
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Index into a table with a signal, linear interpolated@section{categories}
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UGens>Buffer
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@section{related}
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Classes/Index, Classes/IndexInBetween
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@section{description}
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The input signal value is used as an index into the table, with linear interpolation.
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Out of range index values are clipped to the valid range.
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@section{classmethods}
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@section{method}
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ar, kr
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@section{argument}
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bufnum
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index of the buffer.
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@section{argument}
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in
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the input signal.
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@section{examples}
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@racketblock[
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// indexing into a fixed table
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(
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{
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SinOsc.ar(
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IndexL.kr(
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LocalBuf.newFrom([ 200, 300, 400, 500, 600, 800 ].scramble),
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LFSaw.kr(2.0).range(0, 7)
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),
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0,
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0.5
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)
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}.play;
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)
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// with mouse control
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(
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{
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SinOsc.ar(
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IndexL.kr(
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LocalBuf.newFrom([ 200, 300, 400, 500, 600, 800 ].scramble),
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MouseX.kr(0, 7)
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),
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0,
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0.5
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)
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}.play;
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)
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(
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// indexing into a changeable table
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s = Server.local;
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t = [ 200, 300, 400, 500, 600, 800 ];
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b = Buffer(s, t.size, 1);
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// alloc and set the values
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s.listSendMsg( b.allocMsg( b.setnMsg(0, t) ).postln );
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SynthDef(\help_index, { arg out = 0, i_bufnum = 0;
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Out.ar(0,
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SinOsc.ar(
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IndexL.kr(
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i_bufnum,
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LFSaw.kr(2).range(0, 7)
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),
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0,
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0.5
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)
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)
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}).play(s, [\i_bufnum, b]);
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)
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b.setn(*[ 200, 300, 400, 500, 600, 800 ].scramble.postln - 30);
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(
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SynthDef(\help_index, { arg out = 0, i_bufnum = 0;
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Out.ar(0,
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SinOsc.ar(
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IndexL.kr(
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i_bufnum,
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MouseX.kr(0, BufFrames.ir(i_bufnum))
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),
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0,
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0.5
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)
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)
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}).play(s, [\i_bufnum, b]);
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)
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b.free;
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::
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]
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