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q2gen.js
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q2gen.js
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const mod = (x, y) => ((x % y) + y) % y;
function rand(upTo) {
return Math.floor(Math.random() * upTo);
}
function randBetween(a, b) {
return rand(a + b + 1) - a;
}
function randRgb() {
return [rand(256), rand(256), rand(256)];
}
function dist(x, y, z) {
return x * x + y * y + z * z;
}
function nearColor(c, maxDist) {
let r, g, b, d;
const randLevel = (l) =>
randBetween(Math.max(l - maxDist, 0), Math.min(l + maxDist, 255));
do {
r = randLevel(c[0]);
g = randLevel(c[1]);
b = randLevel(c[2]);
d = dist(r - c[0], g - c[1], b - c[2]);
} while (d > maxDist * maxDist);
return [r, g, b];
}
function colorToString(color) {
const hex2pad = l => {
s = l.toString(16);
return s.length < 2 ? '0'+s : s;
};
return color.map(hex2pad).join('');
}
function genQ2(maxDist) {
let color = randRgb();
let c1 = nearColor(color, maxDist);
let c2 = nearColor(color, maxDist);
return [color, c1, c2].map(colorToString);
}
function genQ2Arr(maxDist, amount) {
var result = [];
for (let i = 0; i < amount; i++) {
result.push(genQ2(maxDist));
}
return result;
}