rsc3/doc-schelp/HelpSource/Classes/EventPatternProxy.scrbl

#lang scribble/manual
@(require (for-label racket))

@title{EventPatternProxy}
 event stream reference@section{categories}
  Libraries>JITLib>Patterns, Live Coding
@section{related}
  Classes/Pdef

@section{description}

Keeps a reference to a stream that can be replaced while in use.

@section{ClassMethods}
 

@section{method}
 new
create a new instance with a pattern (the source). The pattern should be an emphasis::event pattern:: (see link::Classes/Pdef::)

@section{method}
 default
a default source, if none is given. the default is a Pbind with resting notes of 1.0 beat duration.

@section{method}
 defaultQuant
set the default quantization value for the class.

@section{InstanceMethods}
 

@section{method}
 source
set the source (a pattern). If a quantization is given, schedule this change to the next beat ( strong::pattern_::(..) is equivalent)

@section{method}
 clear
set the source to nil and stop playing

@section{method}
 quant
get or set the quantization value. can be an array [quant, phase, offset, outset]

@section{method}
 fadeTime
when the synthdefs that are used contain an 
@racketblock[\amp:: control, the patterns are replaced by crossfading the previous with the new over this time (in beats)

]
@section{method}
 envir
provide a default event for the Pdef. It is used to filter the incoming stream before it is passed to the source pattern. This is similar to link::Classes/NodeProxy#-nodeMap::. When set for the first time, the pattern is rebuilt.

@section{method}
 set
set arguments in the default event. If there is none, it is created and the pattern is rebuilt.

@section{subsection}
 a) using as stream reference

@section{method}
 embedInStream
Given a link::Classes/Stream:: like e.g. link::Classes/Routine::, yield all values from the pattern in the proxy before continuing. One pattern proxy can be used to produce values for any number of independent streams.

@section{argument}
 inval
The inval is an link::Classes/Event:: and is passed into all substreams. It can be used to control how they behave from the outside.

@section{argument}
 embed
See link::Classes/Object#-streamArg:: for explanation.

@section{argument}
 default
Replacement for 
@racketblock[nil:: outputs of the source pattern. One use case is link::#-endless::.

]

@racketblock[
a = EventPatternProxy.new;
a.source = Pbind(\freq, Pgeom(100, Pwhite(1.01, 1.2), 4));
r = Routine { |inval| loop { a.embedInStream(inval) }; };
r.nextN(12, ()); // the next 12 values from r
a.source = Pbind(\freq, Pgeom([100, 200], Pwhite(1.01, 1.2), 4));// replace the source
r.nextN(12, ()); // the next 12 values from r
::

]
@section{subsection}
 b) using as EventStreamPlayer

@section{method}
 play
starts the EventPatternProxy and creates a player. if you want to play multiple instances, use link::#-fork::.

@section{argument}
 argClock
play on a certain clock, e.g. a link::Classes/TempoClock::.

@section{argument}
 protoEvent
an event to be used as a first input to the chain

@section{argument}
 quant
can be an array of [quant, phase, offset, outset], or an instance of link::Classes/Quant::.

@section{argument}
 doReset
if set to true, play will restart the stream if already running (a link::Classes/Boolean::).


@racketblock[
// using a protoEvent
Pdef(\x, Pbind(\dur, 0.1));
Pdef(\x).trace.play(protoEvent: (freq: 1000));
::

]

@racketblock[
// using a different clock: here a Scheduler
Pdef(\x, Pbind(\dur, Pwhite(0.1, 0.2, inf), \count, Pseries()));
a = Scheduler(TempoClock.default);
Pdef(\x).trace.play(a);
a.advance(0.2);
::

]
@section{method}
 stop
stops the player

@section{method}
 player
the current player (if the Pdef is simply used in other streams this is 
@racketblock[nil::)

]
@section{method}
 pause, resume, reset
perform player method

@section{method}
 isPlaying
returns true if Pdef is running. if a Pdef is playing and its stream ends, it will schedule a stream for playing as soon as a new one is assigned to it.


@section{Examples}
 

@section{subsection}
 a) embedding EventPatternProxy in streams


@racketblock[
(
SynthDef("Pdefhelp", { arg out, freq, sustain=1, amp=1, pan;
	var env, u=1;
	env = EnvGen.kr(Env.perc(0.03, sustain), 1, doneAction: Done.freeSelf);
	5.do { var d; d = exprand(0.01, 1); u = SinOsc.ar(d * 300, u, rrand(0.1,1.2) * d, 1) };
	Out.ar(out, Pan2.ar(SinOsc.ar(u + 1 * freq, 0, amp * env), pan));

}).add;
)
s.boot;

#a, b, c, m = { EventPatternProxy.new } ! 4;

m.play;
m.source = Pbind(\instrument, \Pdefhelp, \dur, 1, \degree, 16, \legato, 0.1);

a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.25, \degree, Pseq(#[0, 5, 4, 3]));
b.source = Pbind(\instrument, \Pdefhelp, \dur, 0.125, \degree, Pseq(#[7, 8, 7, 8]));
c.source = Pbind(\instrument, \Pdefhelp, \dur, 0.25, \degree, Pseq(#[0, 1, 2], 2));

x = Pseq([a, b, c], inf).play;


c.source = Pbind(\instrument, \Pdefhelp, \dur, 0.25, \degree, Pseq(#[4, 3, 1, 2]*3));


// infinite loops are scheduled (to ths clock's next beat by default) and released:

a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.753, \degree, Pseq(#[0, 5, 4, 3, 2], inf));
a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.125, \degree, Pseq(#[0, 5, 4, 3] + 1, 1));
a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.25, \degree, Pseq(#[0, 5, 4, 3] - 1, 1));

a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.125, \degree, Pseq(#[0, 5] - 1, 1));
a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.753, \degree, Pshuf(#[0, 5, 4, 3, 2], inf));

x.stop;
m.stop;

// EventPatternProxy can be used in multiple patterns

(
x = Ppar([
	Pbindf(Pn(a, inf),
		\gtranspose, Pstutter(8, Pseq(#[0, 2, 0, 3],inf))
	),
	Pbindf(Pn(a, inf),
		\gtranspose, Pstutter(8, Pseq(#[7, 4, 0, 3],inf)),
		\dur, 0.6
	),
	Pbindf(Pn(a, inf),
		\degree, Pseq(#[0, 5, 4, 3, 2, 3, 2], 1)
	)
]).play;
)

a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.1, \degree, Pseq(#[0, 1, 0, 1, 2], inf));

a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.2, \degree, Pseq([0, 4], inf));

a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.2, \degree, Pseq([0, 4, Prand([6, 8b],2)], inf));

a.source = Pbind(\instrument, \Pdefhelp, \dur, 0.1, \degree, Pseq(#[0, 1b, 1, 2b, 2, 3, 4b, 4, 5], inf));

a.set(\detune, -50); // set environment
a.set(\detune, 0);

x.stop;
::

]
@section{subsection}
 b) playing EventPatternProxy


@racketblock[
(
// load a synthdef
s.boot;
SynthDef("gpdef",
	{ arg out=0, freq=440, sustain=0.05, amp=0.1, pan;
		var env;
		env = EnvGen.kr(Env.perc(0.01, sustain), doneAction: Done.freeSelf) * amp;
		Out.ar(out, Pan2.ar(SinOsc.ar(freq, 0, env), pan))
	}).add;
)


#x, y = {EventPatternProxy.new} ! 2;

x.play; // play them. A silent resting pattern is used.
y.play;


// assign various patterns to it:

x.source = Pbind(\dur, 0.25, \instrument, \gpdef);
x.source = Pbind(\dur, 0.25, \degree, Pseq([3, 4, 5b, 6], inf), \instrument, \gpdef);
x.source = Pbind(\dur, 0.25, \degree, Pseq([3, 4, 5b, 6]+1, inf), \instrument, \gpdef);
y.source = Pbind(\dur, 0.25, \degree, Pseq([3, 4, 5b, 6]-1, inf), \instrument, \gpdef);
y.source = Pbind(\dur, 0.25, \degree, Pseq([3, 4, 5b]-2, inf), \instrument, \gpdef);

// using fadeTime:

y.fadeTime = 8.0;
y.source = Pbind(\dur, 0.125, \degree, Pseq([3, 4, 5b, 6]+4.rand, inf), \instrument, \gpdef);
y.source = Pbind(\dur, 0.25, \degree, Pseq([3, 4, 5b, 6]-2, inf), \instrument, \gpdef);

(
x.source = Pbind(
		\dur, 1 / 6,
		\degree, Pseq([3, 4, Prand([8, 2, 3, 9, 10],1) - 5, 6]+1, inf),
		\instrument, \gpdef
		)
	);
)
(
x.source = Pbind(
		\dur, 0.25,
		\degree, Pseq([3, 4, Prand([8, 2, 3, 9, 10],1), 6], inf),
		\instrument, \gpdef)
	);
)
x.stop;



// tempo change
TempoClock.default.tempo = 1.3;
y.source = Pbind(\dur, 0.25, \degree, Pseq([3, 4, 5, 6]+1, inf), \instrument, \gpdef);

// drop in ending patterns

x.play;
x.fadeTime = nil;

x.source = Pbind(\dur, 0.25, \degree, Pseq([3, [7,4], 5, 6]-2), \instrument, \gpdef);
x.source = Pbind(\dur, 0.125, \degree, Pseq([3, [7,4], 5, 4]-3), \instrument, \gpdef);
x.source = Pbind(\dur, 0.35, \degree, Pseq([3, [7,4], 5, 4, 3]-3), \instrument, \gpdef);
x.source = Pbind(\dur, 0.25, \degree, Pshuf([3, [7,4], 5, 6]-2), \instrument, \gpdef);



TempoClock.default.tempo = 1.0;
x.stop;
y.stop;
::
]