/usr/share/SuperCollider/HelpSource/Classes/Demand.schelp is in supercollider-common 1:3.8.0~repack-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | class:: Demand
summary:: Demand results from demand rate UGens.
related:: Classes/Duty, Classes/TDuty
categories:: UGens>Demand
Description::
When there is a trigger at the trig input, a value is demanded each UGen
in the list and output. The unit generators in the list should be
'demand' rate.
When there is a trigger at the reset input, the demand rate UGens in the
list are reset.
classmethods::
private:: categories
method::ar, kr
argument::trig
Trigger. Can be any signal. A trigger happens when the signal
changes from non-positive to positive.
argument::reset
Trigger. Resets the list of UGens when triggered.
argument::demandUGens
List of demand-rate UGens to get values from. When the shortest stream ends, this ugen will set the link::Classes/Done##'done' flag::.
discussion::
By design, a reset trigger only resets the demand ugens; it does not reset the value at Demand's output. Demand continues to hold its value until the next value is demanded, at which point its output value will be the first expected item in the list.
To jump to the start value upon receipt of a reset trigger, one can add (+) the two triggers together:
code::
(
a = { |t_trig, t_reset|
var d = Demand.kr(t_trig + t_reset, t_reset, Dseries(0, 1, inf));
d.poll(t_trig + t_reset);
0.0;
}.play
)
a.set(\t_trig, 1); // do this a few times -- the demand value should increase by 1 each time
a.set(\t_reset, 1); // goes immediately back to 0
::
One demand ugen represents a single stream of values, so that embedding the same ugen twice calls this stream twice. To isolate a demand ugen, use a function:
code::
{
var a, b, t = Impulse.kr(2);
a = { Dseq([1, 2, 3, 4, 5], inf) } * 100;
b = a + 1;
Demand.kr(t, 0, [a, b]).poll(t)
}.play
::
Examples::
code::
// examples
(
{
var trig, seq, freq;
trig = Impulse.kr(24);
seq = Drand([Dseq((1..5).mirror1, 1), Drand((4..10), 8)], 2000);
freq = Demand.kr(trig, 0, seq * 100);
SinOsc.ar(freq + [0,0.7]).cubed.cubed.scaleneg(MouseX.kr(-1,1)) * 0.1;
}.play;
)
(
{
var trig, seq, freq;
trig = Impulse.kr(12);
seq = Drand([Dseq((1..5).mirror1, 1), Drand((4..10), 8)], 2000) * Drand([1,2,4,8],2000);
freq = Demand.kr(trig, 0, seq * 100);
SinOsc.ar(freq + [0,0.7]).cubed.cubed.scaleneg(MouseX.kr(-1,1)) * 0.1;
}.play;
)
(
{
var freq, trig, reset, seq;
trig = Impulse.kr(10);
seq = Diwhite(60, 72, inf).midicps;
freq = Demand.kr(trig, 0, seq);
SinOsc.ar(freq + [0,0.7]).cubed.cubed * 0.1;
}.play;
)
(
{
var freq, trig, reset, seq;
trig = Impulse.kr(10);
seq = Dseq([72, 75, 79, Drand([82,84,86])], inf).midicps;
freq = Demand.kr(trig, 0, seq);
SinOsc.ar(freq + [0,0.7]).cubed.cubed * 0.1;
}.play;
)
(
{
var freq, trig, reset, seq;
trig = Impulse.kr(10);
seq = Dswitch1(
[
Diwhite(60, 72, inf),
Dseq([72, 75, 79, Drand([82,84,86])], inf)
],
LFPulse.kr(0.2)
);
freq = Demand.kr(trig, 0, seq.midicps);
SinOsc.ar(freq + [0,0.7]).cubed.cubed * 0.1;
}.play;
)
(
{
var freq, trig, reset, seq1, seq2;
trig = Impulse.kr(10);
seq1 = Drand([72, 75, 79, 82] - 12, inf).midicps;
seq2 = Dseq([72, 75, 79, Drand([82,84,86])], inf).midicps;
freq = Demand.kr(trig, 0, [seq1, seq2]);
SinOsc.ar(freq + [0,0.7]).cubed.cubed * 0.1;
}.play;
)
(
{
var trig, seq;
trig = Impulse.kr(8);
seq = Drand([
Dseq([4,0,0,1,2,1,0,1]),
Dseq([4,0,2,0,1,0,1,1]),
Dseq([4,0,0,2,0,0,1,1]),
Dseq([4,0,1,2,0,1,2,0]),
Dseq([4,1,1,1,2,2,3,3]),
Dseq([4,1,0,1,0,1,0,1])
], inf);
trig = Demand.kr(trig, 0, seq * 0.4) * trig;
{LPF.ar(PinkNoise.ar, 5000)}.dup * Decay.kr(trig, 0.5);
}.play;
)
::
|