Scheduler schedules functions to be evaluated in the future

superclass: Object

*new(clock, drift)

clock: a clock, like SystemClock.

drift: if true, it will schedule the events relative to Main.elapsedTime,

otherwise to the current seconds of the scheduler.

play(aTask)

schedules the task to play, with the delta time returned from it.

sched(delta, aTask)

schedule the task 

advance(bySeconds)

advance time by n seconds. Any task that is scheduled within the new time,

is evaluated, and, if it returns a new time, rescheduled.

seconds_(newSeconds)

set new time. Any task that is scheduled within the new time,

is evaluated, and, if it returns a new time, rescheduled.

isEmpty

returns whether the scheduling queue is empty.

clear

clear the scheduliong queue

// example:

a = Scheduler(SystemClock);

a.sched(3, { "now it is 3 seconds.".postln; nil });

a.sched(5, { "now it is 5 seconds.".postln; nil });

a.sched(1, { "now it is 1 second.".postln; nil });

a.advance(0.5);

a.advance(0.5);

a.advance(2);

a.advance(2);

// the beats, seconds and clock are passed into the task function:

a.sched(1, { arg beats, secs, clock; [beats, secs, clock].postln });

a.advance(1);

// the scheduling is relative to "now":

a.sched(3, { "now it was 3 seconds.".postln });

a.sched(5, { "now it was 5 seconds.".postln });

a.sched(1, { "now it was 1 second.".postln });

a.advance(0.5);

a.advance(0.5);

a.advance(2);

a.advance(2);

// play a Routine or a task:

a.play(Routine { 5.do { arg i; i.postln; 1.yield } });

a.advance(0.9);

// scheduling tasks

(

x = Scheduler(TempoClock.default);

Task { 

inf.do { |i|

("next " ++ i ++  " in task." + Main.elapsedTime).postln;

0.5.wait;

}

}.play(x)

)

x.advance(0.1);

x.seconds;

x.advance(5);

x.seconds;

(

Routine {

loop { x.advance(0.1); 0.1.wait }

}.play;

)

(

Task { 5.do {

x.advance(1);

2.0.rand.wait;

}

}.play;

)

x.advance(8.1);

Pbind(\degree, Pseries(0, 2, 8), \dur, 0.25).play(x);

(

Task { 5.do {

x.advance(0.20);

1.0.wait;

}

}.play;

)