HelpSource/Classes/IndexL.schelp

   1 class:: IndexL
   2 summary:: Index into a table with a signal, linear interpolated
   3 categories:: UGens>Buffer
   4 related:: Classes/Index, Classes/IndexInBetween
   5
   6 description::
   7 The input signal value is used as an index into the table, with linear interpolation.
   8 Out of range index values are clipped to the valid range.
   9
  10 classmethods::
  11 method:: ar, kr
  12 argument:: bufnum
  13 index of the buffer.
  14 argument:: in
  15 the input signal.
  16
  17 examples::
  18 code::
  19 // indexing into a fixed table
  20 (
  21 {
  22         SinOsc.ar(
  23                 IndexL.kr(
  24                         LocalBuf.newFrom([ 200, 300, 400, 500, 600, 800 ].scramble),
  25                         LFSaw.kr(2.0).range(0, 7)
  26                 ),
  27                 0,
  28                 0.5
  29         )
  30 }.play;
  31 )
  32
  33 // with mouse control
  34 (
  35 {
  36         SinOsc.ar(
  37                 IndexL.kr(
  38                         LocalBuf.newFrom([ 200, 300, 400, 500, 600, 800 ].scramble),
  39                         MouseX.kr(0, 7)
  40                 ),
  41                 0,
  42                 0.5
  43         )
  44 }.play;
  45 )
  46
  47 (
  48 // indexing into a changeable table
  49 s = Server.local;
  50 t = [ 200, 300, 400, 500, 600, 800 ];
  51 b = Buffer(s, t.size, 1);
  52
  53 // alloc and set the values
  54 s.listSendMsg( b.allocMsg( b.setnMsg(0, t) ).postln );
  55
  56 SynthDef(\help_index, { arg out = 0, i_bufnum = 0;
  57         Out.ar(0,
  58                 SinOsc.ar(
  59                         IndexL.kr(
  60                                 i_bufnum,
  61                                 LFSaw.kr(2).range(0, 7)
  62                         ),
  63                         0,
  64                         0.5
  65                 )
  66         )
  67 }).play(s, [\i_bufnum, b]);
  68 )
  69
  70 b.setn(*[ 200, 300, 400, 500, 600, 800 ].scramble.postln - 30);
  71
  72
  73 (
  74 SynthDef(\help_index, { arg out = 0, i_bufnum = 0;
  75         Out.ar(0,
  76                 SinOsc.ar(
  77                         IndexL.kr(
  78                                 i_bufnum,
  79                                 MouseX.kr(0, BufFrames.ir(i_bufnum))
  80                         ),
  81                         0,
  82                         0.5
  83                 )
  84         )
  85 }).play(s, [\i_bufnum, b]);
  86 )
  87
  88 b.free;
  89 ::