October 2014 - chuck-users - lists.cs.princeton.edu

re Instanceof in ChucK
by Casper Schipper 31 Oct '14

31 Oct '14

Try .toString(): it's the closest thing. SinOsc foo; Object bar; class MyClass { float value; } MyClass myInstance; <<<foo.toString()>>>; <<<bar.toString()>>>; <<<myInstance.toString()>>>; "SinOsc:10061d9a0" : (string) "Object:61000009e190" : (string) "MyClass:61000009e140" : (string) Best, Casper > > 1. Instanceof in ChucK (Will Hardwick-Smith) > > From: Will Hardwick-Smith <whardwicksmith(a)gmail.com> > To: chuck-users(a)lists.cs.princeton.edu > Date: 30 oktober 2014 23:34:57 CET > Reply-To: ChucK Users Mailing List <chuck-users(a)lists.cs.princeton.edu> > Subject: [chuck-users] Instanceof in ChucK > > > Say I have Object o, and I want to see if it is an instance of UGen or a sub-class of UGen. > Is there a way to check this in ChucK? > > > _______________________________________________ > chuck-users mailing list > chuck-users(a)lists.cs.princeton.edu > https://lists.cs.princeton.edu/mailman/listinfo/chuck-users

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Instanceof in ChucK
by Will Hardwick-Smith 30 Oct '14

30 Oct '14

Say I have Object o, and I want to see if it is an instance of UGen or a sub-class of UGen. Is there a way to check this in ChucK?

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timing without audio?
by Forrest Curo 30 Oct '14

30 Oct '14

As I understand it, you send some number to 'now' and for that length of time the confuser will continue to run whatever oscillator instances you've started, then go on through your code. So if you only used it to generate values to trigger voices and changes in other software, you could run Chuck without much overhead? Is this right, and how can I minimize that overhead? [Forrest Curo San Diego]

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bandwidth in band reject filter
by Michael Heuer 27 Oct '14

27 Oct '14

Hello, I'm currently using the C*APS Eq10 10-band equalizer http://quitte.de/dsp/caps.html#CAPS_for_Electric_Guitar via the LADSPA ChuGin https://github.com/jwmatthys/chugins as part of an effect but all I really need is something to scoop the mids. I thought I might use the BRF band reject filter http://chuck.cs.princeton.edu/doc/program/ugen_full.html#BRF I can't tell how to set the bandwidth (or described another way, the range of frequencies around the center frequency that are rejected by the filter). I went off into reading Miller Puckette's book Theory and Techniques of Electronic Music http://msp.ucsd.edu/techniques.htm and am now lost somewhere in the imaginary plane. The definition of the Q parameter seems to vary among the different ChucK filters (resonance vs quality vs Q) and I suppose I should understand what that means. Feel free to tell me to go back to my reading. :) michael

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Identifying special keys (e.g control, alt, arrow keys)
by Will Hardwick-Smith 27 Oct '14

27 Oct '14

I'm interested in making a ChucK program which responds to key presses to assist users' typing. Using ascii codes from HidMsg.ascii, I can differentiate between many keys, but not some keys like the arrow keys, (on windows) control, alt, shift, tab, home, end and some others. I wasn't able to find documentation for the Hid or HidMsg classes. Is there any way to identify these keys in ChucK?

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confused about time/control
by Peter Lutek 23 Oct '14

23 Oct '14

greetings! a little help for a newbie?.... when i run this bit of code, i would have expected the while loop to run for only 5 seconds, printing out a new value for "beat" whenever new data comes in from MIDI. then, it should print "done". instead, it just keeps printing the new "beat" values for as long as i let it run, never getting to the "done" line. i don't understand why the "while( now < later )" doesn't kill the loop after 5 seconds. also, xruns go through the roof and i have to kill it externally. i'm on linux, using jack. (all the setup of MIDI ports and variables happens before this, and i know it's functioning fine...) //////////// dur beat; now + 5::second => time later; while( now < later ){ while( min.recv(msgin) ){ ( msgin.data3 + 10 ) * 50::ms => beat; <<<beat>>>; } } <<<"done">>>; /////////// thanks much, in advance... cheers! .pltk. -- Peter Lutek improvising musician in Toronto, Canada http://peterlutek.com

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Static attributes and instantiation
by Gonzalo 23 Oct '14

23 Oct '14

Hi, This is weird behavior I think: -------------------- public class Foo { 1 => static int bar; } <<< Foo.bar >>>; // prints 0! Why? Foo f; <<< Foo.bar >>>; // prints 1, ok 2 => Foo.bar; <<< Foo.bar >>>; // prints 2, ok Foo f2; <<< Foo.bar >>>; // prints 1 again! -------------------- So it seems that static members get initialized only on instantiation, but to make it funky, on every instantiation... Is this a buggy implementation of static members, or am I missing something? Not complaining, just a question. :) Thanks! Gonzalo

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Calling parent methods
by Gonzalo 22 Oct '14

22 Oct '14

Hi, I'm pretty sure the answer is no, but here we go: is there a way to call the parent's method from a class? Something like: class Child { fun void init() { super.init(); // now do more stuff } } Thanks! Gonzalo

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Two classes referencing each other
by Gonzalo 18 Oct '14

18 Oct '14

Is this possible? If class A uses class B somewhere, and viceversa, how can I load them both from a third file? Cheers, Gonzalo

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Casting behaviour
by Gonzalo 17 Oct '14

17 Oct '14

I have this (unexpected?) behaviour when casting. I can cast a object to its parent class, but the methods that get executed are still their own (and viceversa). I.e.: ---------------------------------- public class Parent { fun void test() { <<< "Parent" >>>; } } class Child extends Parent { fun void test() { <<< "Child" >>>; } } Parent p; Child @ ch; p $ Child @=> ch; ch.test(); // prints Parent Child ch2; ch2 $ Parent @=> p; p.test(); // prints Child ---------------------------------- Is this intended behavior? What's the point of casting then? I might describe too what I'm trying to do, maybe there's a better approach. I have a .create method in Parent that returns a Parent object, and I wanted to create that same method in Child, but I can't do it because the arguments are the same, and it won't let me overwrite the method when only the return type changes. So to create a child with the .create method, I do this: Parent.create(...) $ Child @=> Child ch; Which works, but then it still behaves as a parent, so it defeats the whole purpose. Thoughts? Gonzalo

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