SystemClock

superclass: Clock

SystemClock is more accurate, but cannot call Cocoa primitives.

AppClock is less accurate (uses NSTimers) but can call Cocoa primitives.

*sched(delta,task)

the float you return specifies the delta to resched the function for

SystemClock.sched(0.0,{ arg time;  

time.postln; 

rrand(0.1,0.9) 

});

returning nil will stop the task from being rescheduled

SystemClock.sched(2.0,{ 

"2.0 seconds later".postln; 

nil 

});

*clear

clear the SystemClock's scheduler to stop it

SystemClock.clear

*schedAbs(time,task)

SystemClock.schedAbs( (thisThread.seconds + 4.0).round(1.0),{ arg time;

("the time is exactly " ++ time.asString 

++ " seconds since starting SuperCollider").postln;

});

*play(task)

Calls to the cocoa framework (including all GUI) may not be made directly 

from actions triggered by SystemClock or incoming socket messages 

(OSCresponder). 

To get around this, use { }.defer

This will execute the function using the AppClock and is equivalent to

AppClock.sched(0, function):

(

var w, r;

w = Window.new("trem", Rect(512, 256, 360, 130));

w.front;

r = Routine({ arg time;

60.do({ arg i;

0.05.yield;

{

w.bounds = w.bounds.moveBy(10.rand2, 10.rand2);

w.alpha = cos(i*0.1pi)*0.5+0.5;

}.defer;

});

1.yield;

w.close;

});

SystemClock.play(r);

)

This example is only to show how to make calls to Cocoa/GUI when 

scheduling with the SystemClock.

If you only wish to control the GUI, use AppClock.