Design engineer, visualization researcher.
Published
Edited
Jan 28, 2020
1 star
mutable segments = Array.from(new Array(16), () => ({v: 0, w: 0}))
hits = d3.range(mutable segments.length).map(i => Math.random() < .5 ? 50+Math.random()*20 : -1)
// d3.range(mutable segments.length).map((i) => {return i == 4 ? 60 : -1})
// mutable segments[5].v = 2
mutable I = 1 // or ~80 velocity
env = ({attack: .001, decay: 0.5, sustain: .1, release: 1.4})
// ({attack: .02, decay: 0.2, sustain: .0, release: 1.0})
// https://observablehq.com/@maddievision/song-player
synth = {
let polyphony = mutable segments.length,
// env = {attack: .1, decay: .4, sustain: .01, release: .01},
volume = -10
var synth = new Tone.PolySynth(polyphony, Tone.Synth, {
oscillator: {type: 'sine'},
// noise: {type: 'white'},
envelope: env,
volume
}).toMaster();
try {
yield synth;
yield invalidation;
} finally {
synth.dispose();
}
}
t = {
let t = mutable pause
// mutable I = 2
try {
yield t
while (true) {
mutable segments.forEach((u, i) => {
let {v,w} = u, // using a singly linked list topology
forcing = i == 0 ? 0 : mutable segments[i-1].v //+ mutable segments[i+1].v
// https://en.wikipedia.org/wiki/FitzHugh%E2%80%93Nagumo_model
let dv = (v*1.5 - v*v*v*.3 - w + forcing) * 1.8,
dw = (v + .5 - .5*w) * 1.2
u.v += dv/20
u.w += dw/20
if (i == 0 && mutable I != 0) u.v = mutable I
})
mutable segments = mutable segments
mutable I = 0
yield Promises.delay(10, ++t)
}
}
finally {
mutable pause = t
}
}
mutable pause = 0
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