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Diffstat (limited to 'client/lib/life.js')
| -rw-r--r-- | client/lib/life.js | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/client/lib/life.js b/client/lib/life.js new file mode 100644 index 0000000..26ff0bf --- /dev/null +++ b/client/lib/life.js @@ -0,0 +1,75 @@ + +let w, h, a, b, notes, assign +function init(z, fn){ + // really bad + notes = z + assign = fn + build() + setTempo(50) +} +function build(){ + w = notes.length + h = notes[0].length + a = a || new Array(w) + b = b || new Array(w) + for (var i = 0; i < w; i++) { + a[i] = a[i] || new Array(h) + b[i] = b[i] || new Array(h) + for (var j = 0; j < h; j++) { + a[i][j] = b[i][j] = (notes[i][j] && notes[i][j].playing) ? 1 : 0 + } + } +} +let timeout, delay = 1200 // ~120 bpm +function toggle(){ + build() + if (timeout) { + clearTimeout(timeout) + timeout = null + } + else { + step() + } +} +function assign_item(freq,state){ + b[freq.i][freq.j] = state ? 1 : 0 +} +function setTempo(bpm){ + console.log('bpm:', bpm) + delay = 60000/bpm +} +function swap () { + var tmp = a + a = b + b = tmp +} +function step() { + clearTimeout(timeout) + timeout = setTimeout(step, delay) + swap() + let i, j, ni, pi, nj, pj, score, state + for (i = 0; i < w; i++) { + for (j = 0; j < h; j++) { + ni = i === 0 ? w-1 : i-1 + pi = i === w-1 ? 0 : i+1 + nj = j === 0 ? h-1 : j-1 + pj = j === h-1 ? 0 : j+1 + score = a[ni][nj] + a[ni][j] + a[ni][pj] + a[i][nj] + a[i][pj] + a[pi][nj] + a[pi][j] + a[pi][pj] + state = fitness(a[i][j], score) + b[i][j] = state + if (a[i][j] !== state) { + assign(notes[i][j], state) + } + } + } +} +function fitness (old, score) { + if (old === 1) { + if (score === 2 || score === 3) return 1 + } else { + if (score === 3) return 1 + } + return 0 +} + +export default { init, step, assign_item, toggle, setTempo }
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