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synth.js
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synth.js
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import { A, B, C, Csharp, D, Dsharp, E, F, Fsharp, G, Gsharp, rootToKey } from './data.js'
const octave = (r, g, b) => {
const sum = parseInt(r) + parseInt(g) + parseInt(b)
let num
if (sum < 256) {
num = '3'
} else if (sum >= 256 && sum < 511) {
num = '4'
} else {
num = '5'
}
return num
}
const rootNote = (r, g, b) => {
let note
if (r < 21) {
note = 'G'
} else if (r >= 21 && r < 41) {
note = 'C'
} else if (r >= 42 && r < 65) {
note = 'A'
} else if (r >= 65 && r < 86) {
note = 'C#'
} else if (r >= 86 && r < 107) {
note = 'F'
} else if (r >= 107 && r < 129) {
note = 'A#'
} else if (r >= 129 && r < 150) {
note = 'D'
} else if (r >= 150 && r < 171) {
note = 'B'
} else if (r >= 171 && r < 193) {
note = 'G#'
} else if (r >= 193 && r < 214) {
note = 'D#'
} else if (r >= 214 && r < 235) {
note = 'F#'
} else if (r >= 235 && r < 255) {
note = 'E'
}
return note + octave(r, g, b)
}
const secondNote = (r, g, b, root) => {
let blue = parseInt(b)
let key = rootToKey(root.substring(0, root.length - 1))
let note
if (blue < 43) {
note = key.M3
} else if (blue >= 43 && blue < 86) {
note = key.M6
} else if (blue >= 86 && blue < 128) {
note = key.P4
} else if (blue >= 128 && blue < 170) {
note = key.P5
} else if (blue >= 170 && blue < 213) {
note = key.m3
} else if (blue >= 213) {
note = key.m6
}
return note + octave(r, g, b)
}
const thirdNote = (r, g, b, root) => {
let green = parseInt(g)
let key = rootToKey(root.substring(0, root.length - 1))
let note
let oct
if (green < 43) {
note = key.m9
} else if (green >= 43 && green < 86) {
note = key.m7
} else if (green >= 86 && green < 128) {
note = key.P5
} else if (green >= 128 && green < 170) {
note = key.P5
} else if (green >= 170 && green < 213) {
note = key.M9
} else if (green >= 213) {
note = key.M7
}
if (note != key.m7 && note != key.M7) {
oct = parseInt(octave(r, g, b)) + 1
} else {
oct = parseInt(octave(r, g, b))
}
return note + oct.toString()
}
const effect = (r, g, b) => {
let red = parseInt(r)
let green = parseInt(g)
let blue = parseInt(b)
console.log(red, green, blue)
//purple
if (red - green > 30 && blue - green > 30 && (red - blue < 60 || blue - red < 60)) {
return 1
}
// red
else if (red - green > 60 && red - blue > 60) {
return 4
}
// green
else if (green - red > 60 && green - blue > 60) {
return 2
}
//blue
else if (blue - red > 60 && blue - green > 60) {
return 1
}
// dark
else if (red + green + blue < 450) {
return 0
}
// light
else {
return 3
}
/*
0: phaser
1: verb
2: chorus
3: delay
4: distortion
*/
}
export { rootNote, secondNote, thirdNote, effect }