[chuck-users] Static data problem (arrays, floats)

[David Rush]

2009/9/15 Andrew C. Smith <acsmith at willamette.edu>:
> Basically, I want a static function that holds a tuning map in it
> (sort of an alternative to mtof).

For what it's worth, I created a Pitchmap class to abstract around
this problem, but I also wanted to have a slightly more complex
mapping from notes to frequencies. I then sub-classed Pitchmap to have
ArrayPitchmap which I use for  certain funky Just and Indian
intonations. As Below

public class Pitchmap {
    fun float freq(int spec[]) {
        return Math.pow(2, spec[0] / 1200.0); }}


public class ArrayPitchmap extends Pitchmap {
    440 => float root;
    float notes[];
    fun float freq(int spec[]) {
        0 => int octave;
        if(spec[0] > notes.size()) return root;
        if(spec.size() >= 2) spec[1] => octave;
        return root * Math.pow(2.0, octave) * notes[spec[0]]; }}

ArrayPitchmap Just2357;
[1.0,
 0.14285714285714285,
 0.2, 0.2857142857142857,
 0.3333333333333333,
 0.4, 0.42857142857142855,
 0.5, 0.5833333333333334,
 0.6, 0.625, 0.6666666666666666,
 0.7, 0.7142857142857143,
 0.75, 0.8333333333333334,
 0.875
 ] @=> Just2357.notes;

ArrayPitchmap MaGrama;
[1.40625,
 1.5,
 1.6666666666666667,
 1.875,
 2.0,
 2.1333333333333333,
 2.25,
 2.5,
 2.6666666666666665
] @=> MaGrama.notes;

david rush
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