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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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