196 lines
4.7 KiB
Text
196 lines
4.7 KiB
Text
class:: Pspawner
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summary:: dynamic control of multiple event streams from a Routine
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related:: Classes/Pspawn
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categories:: Streams-Patterns-Events>Patterns>Parallel
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description::
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Pspawner allows a routine to dynamically start and stop subpatterns.
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ClassMethods::
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method::new
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argument::routineFunc
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The function defines a link::Classes/Routine:: that receives a link::Classes/Spawner:: as its sole argument. All control of subpatterns is through the spawner.
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link::Classes/Spawner:: responds to the messages:
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definitionlist::
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## par ||
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Begin an event stream in parallel to the routine. If delta is non-zero, the pattern will begin that many beats after 'now', provided that now + delta is later than the next event that the Spawner will generate. The method returns the stream. This may be called from any object.
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## seq ||
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Run the entire pattern and then return control to the routine.
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## wait ||
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Wait strong::dur:: seconds and then return control to the routine.
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## suspend ||
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Find the stream in the Spawner and stop it, returns nil if the stream is not found, the stream otherwise.
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## suspendAll ||
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Stop all substreams of the Spawner.
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::
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note::
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We should move the documentation of above methods to the link::Classes/Spawner:: helpfile...
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::
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Examples::
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code::
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// example 1: a simple Pspawner
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(
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Pspawner({ | sp |
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// parallel in-c'ish pulses will run throughout the example
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sp.par(Pbind(*[ degree: [0,7], octave: 7, dur: 0.2, db: Pseq([-20, -24, -22, -24], inf)]) );
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// scales in sequence with pauses
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sp.seq(
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Pbind(*[ degree: Pseq((0..7).mirror), dur: 0.2])
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);
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sp.wait(0.4);
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sp.seq(
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Ppar([
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Pbind(*[ degree: Pseq((0..7).mirror), dur: 0.2, octave: 4]),
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Pbind(*[ degree: Pseq((0..7).reverse.mirror), dur: 0.2])
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])
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);
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sp.wait(3);
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sp.seq(
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Pbind(*[ degree: Pseq((0..7).mirror), dur: 0.2, mtranspose: (0,2..14)])
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);
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// scales overlaped at 0.4 second intervals
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10.do {
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sp.par(
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Pbind(*[ degree: Pseq((0..7).mirror), dur: 0.2])
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);
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sp.wait(0.4)
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};
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sp.wait(1.6);
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sp.suspendAll;
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}).play
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)
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(
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// example 2: create 6 streams at 4 second intervals
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// then delete them in the order they were created
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Pspawner({ | sp |
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var streams, stream;
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// start patterns, collect the resultant event streams
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streams = [2, 3, 4, 6, 7, 8].collect { | i |
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stream = sp.par(Pbind(*[
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harmonic: i,
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ctranspose: [0, 1, 3]/40,
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octave: Pbrown(2,8,2), dur: 1/i, db: -30
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]) );
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sp.wait(4);
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stream;
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};
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// now stop those streams one by one
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streams.do { | s | sp.suspend(s); sp.wait(4) };
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}).play
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)
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(
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// example 3: define a Pspawner and use Pattern manipulations
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p = Pspawner({ | sp |
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var pat = Pbrown( -7, 7, 3);
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sp.par(Pbind(*[octave: 5, degree: pat, dur: 1/4]) );
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sp.wait(2);
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sp.par(Pbind(*[octave: 6, degree: pat, dur: 1/8]) );
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sp.wait(3);
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sp.par(Pbind(*[octave: 7, degree: pat, dur: 1/6, db: -20]) );
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sp.wait(4);
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sp.par(Pbind(*[octave: 4, degree: pat, dur: 1/4]) );
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sp.wait(8);
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sp.suspendAll;
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});
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)
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// play the basic patten
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p.play;
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(
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// manipulate basic pattern with Pchain
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Pchain(
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Pbind(*[mtranspose: Pkey(\mtranspose) + Pstutter(8, Prand([0,[0,3,-2],[0,2,4]], inf)) ] ), //make some notes into triads
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Pbind(*[ctranspose: Pwhite(-0.1, 0.1)]), //add random detuning to notes
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Pbind(*[\scale, Scale.minor]), //alter the scale
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Pn(Pseq([p, (type:\rest, dur: 1.0)]) ), //repeat the pattern after a 1 second pause
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Pbind(*[
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db: Pstep(Pseq([-10, -13, -13, -11, -13, -13], inf), 0.1) - 10,
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mtranspose: Pstep(Pwhite(-7,7), Prand([5,4,2],inf) ) //random modal transposition
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])
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).play(protoEvent: Event.default)
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)
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// example 4: altering the contents of the Pspawner from separate code
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(
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a = Pspawner({ |sp |
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c = sp; // store the Spawner in a global variable
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100.do{ sp.wait(1) }
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});
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a.play;
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)
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( // c will not be valid until the Pspawner has run
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b = c.par( // now start a pattern in spawner
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Pbind(*[degree: Pseq((0..6) ++ (7..1), inf), dur: 0.2])
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);
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)
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c.suspend(b) // we can suspend and resume the stream
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c.par(b)
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c.suspend(b)
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(
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b = c.par( // or just start up a new pattern
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Pbind(*[degree: Pseq((0..6) ++ (7..1), inf), dur: 0.2])
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);
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)
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// example 5: Spawner can be used directly in the manner of Pspawner.
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// This allows external code to access to the spawner whether or not it has run
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(
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c = Spawner({ |sp |
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100.do{ sp.wait(1) }
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});
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b = c.par( // now start a pattern in spawner
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Pbind(*[degree: Pseq((0..6) ++ (7..1), inf), dur: 0.2])
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);
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c.play; // in this case, c is always valid
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)
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c.suspend(b) // we can suspend and resume the stream
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c.par(b)
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c.suspend(b)
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(
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b = c.par( // or just start up a new pattern
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Pbind(*[degree: Pseq((0..6) ++ (7..1), inf), dur: 0.2])
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);
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)
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(
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Pspawner({ | sp |
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(1..5).do { | i |
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sp.par(Pbind(*[
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octave: i + 2,
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degree: Pwhite(0,7), dur: 1/i, db: -30
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]) );
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sp.wait(4);
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};
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sp.suspendAll;
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}).play
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)
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::
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