June 2008 - chuck-users - lists.cs.princeton.edu

text highlighting
by Renato Fabbri 20 Jun '08

20 Jun '08

i think that i have seen something about text highlighting on the list. i wanted to use mini-audicle's highlighting on kate. any idea? (i can't reach the mailing lists archive)

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Envelope.rate() READ
by Kassen 19 Jun '08

19 Jun '08

Fellow ChucKists, Envelope.rate() is a read-write function so I thought I'd try to use it to detect the current movement of a envelope, like this: ========================================= Envelope e => blackhole; e.value(0); e.duration(second); e.target(1); now + 3::second => time later; while(now <later) { <<<e.rate()>>>; 10::ms => now; } ================ It now turns out that .rate(), when read from, reports the rate of change Envelope had when it was last set to a target, not necessarily it's current rate of change (which may well be 0). I'd like to propose this behaviour to be changed towards Envelope always reporting it's current rate of change. Because Envelope is a part of the STK we may need to be careful with that as other Ugens inherit from it so such changes might affect those. Still; there are a few STK Ugens that are on The List to have a look at because of their envelope (probably ADSR) based behaviour anyway. Stricktly speaking this change could break some ChucK code as well but I find it hard to imagine situations where the current behaviour is more usefull then my proposed change. Yours, Kas.

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Returning a Shred and crashing Chuck
by mike clemow 13 Jun '08

13 Jun '08

Hi folks! Riddle me this... This destroys poor Chuck after a short time: ----- class Forkable { // I am a process fun void run() { // sporkable code here... SinOsc s => dac; 100::ms => now; me.yield(); } } class Forker { // I fork a process (Forkable) fun Shred fork( Forkable f ) { // code that forks a Forkable spork ~ f.run() @=> Shred @ offspring; // RETURNING A SHRED OBJECT me.yield(); return offspring; } } Forkable forkable; Forker forker; while( true ) { forker.fork( forkable ); 50::ms => now; } ----- This, however, does not: ----- class Forkable { // I am a process fun void run() { // sporkable code here... SinOsc s => dac; 100::ms => now; me.yield(); } } class Forker { // I fork a process (Forkable) fun void fork( Forkable f ) { // code that forks a Forkable spork ~ f.run(); // NOT RETURNING THE SHRED OBJECT HERE me.yield(); } } Forkable forkable; Forker forker; while( true ) { forker.fork( forkable ); 50::ms => now; } ----- What gives? It apparently doesn't like the return of the Shred object. I'm not sure what's happening here. It's not *really* that important to me, but it would be nice to have the option of killing that process later. Any ideas? Am I doing something wrong??? Cheers, Mike -- http://semiotech.org http://deadlylittlepills.com/michael

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A new weird controller
by Martin Ahnelöv 12 Jun '08

12 Jun '08

This is basically a device that lets you manipulate 3d-games in the same way as the wiimote does, except that this one got force feedback so you can for example feel weather the surface you are touching is soft or hard, and so on. Maybe something to take on once you feel done with accelerometers? http://www.haptx.com/falcon/index.php "The Novint Falcon lets you feel high-fidelity three-dimensional force feedback (haptics), while controlling the game in three dimensions. The Falcon controller not only moves right, left, up and down, like a mouse, but also moves inwards and outwards for a true 3D touch enabled gaming experience." "The critics have so far been unanimous stating that the Falcon provides a more immersive and intense computer gaming experience, some even stating that it’s Nintendo Wii and Force Feedback on steroids." Enjoy, Gasten

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disabling autoconnect to jack
by Atte André Jensen 12 Jun '08

12 Jun '08

Hi I don't use chuck that much with jack, but now I might. However, chuck automatically connects its inputs/outputs to the soundcard, which is generally considered baaad. There's no commandline options to avoid this, right? If not, may I strongly suggest that something like this is added to this years release? Anyways, I tried hacking in the code (I disabled something like this in other open source software before), but I can't seem to locate the place this autoconnect is happening. Could anyone help my find the good entrypoint? -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk

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ChucK File Size Limit
by Inventor-66＠comcast.net 11 Jun '08

11 Jun '08

Hi, Someone has posted to the ChucK forum with a source code file size limit problem. He is using really huge files and ChucK is crashing. The error message is: > test.ck]:line(3).char(19991): memory exhausted Which we pointed out to him meant he had almost 20,000 characters on one line! So he fixed that and made the file with many shorter lines, and still ran into the problem. Then he looked in the source code and posted this: > In the file src/chuck.tab.c we have a "YYMAXDEPTH 10000" with comments: > > /* YYMAXDEPTH -- maximum size the stacks can grow to (effective only > if the built-in stack extension method is used). > > Do not make this value too large; the results are undefined if > YYSTACK_ALLOC_MAXIMUM < YYSTACK_BYTES (YYMAXDEPTH) > evaluated with infinite-precision integer arithmetic. */ > > I tried changing this constant but managed to pump it upto 15000. Any higher caused problems. What is the problem, can we get around it, and what should I tell this ChucKist? Thanks Les Hall (Inventor)

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Guitar Zero
by Inventor-66＠comcast.net 09 Jun '08

09 Jun '08

Hi, I've written a program inspired by the console game "Guitar Hero" in ChucK. For now it's named "Guitar Zero" unless I think of a better name. Instead of using a special guitar-like controller, it listens to a real guitar/amp via the computer's microphone. The opening screen lets you select parameters and then you get a scoreboard and a fretboard. The program then gives you random notes and detects whether you have played them correctly by using comb filters. So far Guitar Zero is kind of fun and it helps me practice the fretboard. I just got done adding exponentially decreasing time allotment and automatic level increment, but it needs more. I was thinking of adding chords and then possibly whole songs instead of random notes. The thing is, detecting chords might be rather difficult. I could create a chord as an array of notes and have a separate comb filter detecting each note, which is my current plan. Maybe that's the best way to do it. I have the advantage that I know which frequency is the fundamental of each note within a correct chord. So I'm writing partly to share my kewl Guitar Zero program (source posted on the forum), and partly to get your ideas on note and chord detection algorithms. How would you do this task? Thanks, Les Hall (Inventor)

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Crash whit array
by lucas samaruga 08 Jun '08

08 Jun '08

Hi This code produce a crash on linux with chuck-alsa. Maybe the "logic" is not right but the crash exist. class Foo {} fun void appendCap( Foo arr[], int n ) { Foo @ aux[ arr.cap() + n ]; for( int i; i < arr.cap(); i++ ) { arr[i] @=> aux[i]; } aux @=> arr; } Foo @ vars[5]; for( int i; i < vars.cap(); i++ ) <<< vars[i] >>>; appendCap( vars, 5 ); //<<< vars[4] >>>; <<< vars.cap() >>>; <<< "End" >>>; /* this work fine fun Foo[] append( Foo arr[], int n ) { Foo @ aux[ arr.cap() + n ]; for( int i; i < arr.cap(); i++ ) { arr[i] @=> aux[i]; } return aux; } */ Yours Lucas

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Public sporking?
by Kassen 08 Jun '08

08 Jun '08

Dear list, Sporking is fun and we can spork fun's (as long as they are of type "void") but now ( http://electro-music.com/forum/viewtopic.php?t=26805 ) it turns out that we can also spork a public. Considering that ChucKian legend has it "spork" is a slightly dirty word "public sporking" must be downright naughty, especially considering no class is needed. I'm sorry; that was too good to pass up. ========================= //the following will run, not limited in the slightest by trivialities like -say- language specifications. //note there is no class in sight public void foo() { <<<"ping">>>; } spork ~foo(); second => now; ===================== Could somebody comment on this? Is this of any use at all? well, aside from breaking the monotony of code by having synonyms? Confused, Kas.

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Functional Chuck?
by mike clemow 08 Jun '08

08 Jun '08

Hey folks, Anyone else really wish that Chuck supported higher order functions??? check it out. This doesn't work, but i'd love for it to work: // a function that returns an int fun int fn( int n ) { return n + 3; } // a function that takes a function and an array of ints // and returns an array of ints which correspond to the action // of that function on each int in the original array fun int[] mapInt( function fn, int list[] ) { int results[list.cap()]; for( 0 => int i; i < list.cap(); i++ ) { fn( list[i] ) => results[i]; } return results; } [1, 2, 3, 4, 5] @=> input; Add3 add3; mapInt( add3, input ) => int output[]; <<< output[2] >>>; // should print 6 -- I just wish that functions could take other functions as parameters and return functions as their return value. I think that would make sense. Functions, I find are more powerful than classes in Chuck. Also, why is "function" a keyword? cheers, mike -- http://semiotech.org http://deadlylittlepills.com/michael

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