diff --git a/color.js b/color.js
deleted file mode 100644
index 9f59b69..0000000
--- a/color.js
+++ /dev/null
@@ -1,289 +0,0 @@
-'use strict';
-
-class Color {
- constructor(r, g, b) {
- this.set(r, g, b);
- }
-
- toString() {
- return `rgb(${Math.round(this.r)}, ${Math.round(this.g)}, ${Math.round(this.b)})`;
- }
-
- set(r, g, b) {
- this.r = this.clamp(r);
- this.g = this.clamp(g);
- this.b = this.clamp(b);
- }
-
- hueRotate(angle = 0) {
- angle = angle / 180 * Math.PI;
- const sin = Math.sin(angle);
- const cos = Math.cos(angle);
-
- this.multiply([
- 0.213 + cos * 0.787 - sin * 0.213,
- 0.715 - cos * 0.715 - sin * 0.715,
- 0.072 - cos * 0.072 + sin * 0.928,
- 0.213 - cos * 0.213 + sin * 0.143,
- 0.715 + cos * 0.285 + sin * 0.140,
- 0.072 - cos * 0.072 - sin * 0.283,
- 0.213 - cos * 0.213 - sin * 0.787,
- 0.715 - cos * 0.715 + sin * 0.715,
- 0.072 + cos * 0.928 + sin * 0.072,
- ]);
- }
-
- grayscale(value = 1) {
- this.multiply([
- 0.2126 + 0.7874 * (1 - value),
- 0.7152 - 0.7152 * (1 - value),
- 0.0722 - 0.0722 * (1 - value),
- 0.2126 - 0.2126 * (1 - value),
- 0.7152 + 0.2848 * (1 - value),
- 0.0722 - 0.0722 * (1 - value),
- 0.2126 - 0.2126 * (1 - value),
- 0.7152 - 0.7152 * (1 - value),
- 0.0722 + 0.9278 * (1 - value),
- ]);
- }
-
- sepia(value = 1) {
- this.multiply([
- 0.393 + 0.607 * (1 - value),
- 0.769 - 0.769 * (1 - value),
- 0.189 - 0.189 * (1 - value),
- 0.349 - 0.349 * (1 - value),
- 0.686 + 0.314 * (1 - value),
- 0.168 - 0.168 * (1 - value),
- 0.272 - 0.272 * (1 - value),
- 0.534 - 0.534 * (1 - value),
- 0.131 + 0.869 * (1 - value),
- ]);
- }
-
- saturate(value = 1) {
- this.multiply([
- 0.213 + 0.787 * value,
- 0.715 - 0.715 * value,
- 0.072 - 0.072 * value,
- 0.213 - 0.213 * value,
- 0.715 + 0.285 * value,
- 0.072 - 0.072 * value,
- 0.213 - 0.213 * value,
- 0.715 - 0.715 * value,
- 0.072 + 0.928 * value,
- ]);
- }
-
- multiply(matrix) {
- const newR = this.clamp(this.r * matrix[0] + this.g * matrix[1] + this.b * matrix[2]);
- const newG = this.clamp(this.r * matrix[3] + this.g * matrix[4] + this.b * matrix[5]);
- const newB = this.clamp(this.r * matrix[6] + this.g * matrix[7] + this.b * matrix[8]);
- this.r = newR;
- this.g = newG;
- this.b = newB;
- }
-
- brightness(value = 1) {
- this.linear(value);
- }
- contrast(value = 1) {
- this.linear(value, -(0.5 * value) + 0.5);
- }
-
- linear(slope = 1, intercept = 0) {
- this.r = this.clamp(this.r * slope + intercept * 255);
- this.g = this.clamp(this.g * slope + intercept * 255);
- this.b = this.clamp(this.b * slope + intercept * 255);
- }
-
- invert(value = 1) {
- this.r = this.clamp((value + this.r / 255 * (1 - 2 * value)) * 255);
- this.g = this.clamp((value + this.g / 255 * (1 - 2 * value)) * 255);
- this.b = this.clamp((value + this.b / 255 * (1 - 2 * value)) * 255);
- }
-
- hsl() {
- // Code taken from https://stackoverflow.com/a/9493060/2688027, licensed under CC BY-SA.
- const r = this.r / 255;
- const g = this.g / 255;
- const b = this.b / 255;
- const max = Math.max(r, g, b);
- const min = Math.min(r, g, b);
- let h, s, l = (max + min) / 2;
-
- if (max === min) {
- h = s = 0;
- } else {
- const d = max - min;
- s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
- switch (max) {
- case r:
- h = (g - b) / d + (g < b ? 6 : 0);
- break;
-
- case g:
- h = (b - r) / d + 2;
- break;
-
- case b:
- h = (r - g) / d + 4;
- break;
- }
- h /= 6;
- }
-
- return {
- h: h * 100,
- s: s * 100,
- l: l * 100,
- };
- }
-
- clamp(value) {
- if (value > 255) {
- value = 255;
- } else if (value < 0) {
- value = 0;
- }
- return value;
- }
-}
-
-class Solver {
- constructor(target, baseColor) {
- this.target = target;
- this.targetHSL = target.hsl();
- this.reusedColor = new Color(0, 0, 0);
- }
-
- solve() {
- const result = this.solveNarrow(this.solveWide());
- return {
- values: result.values,
- loss: result.loss,
- filter: this.css(result.values),
- };
- }
-
- solveWide() {
- const A = 5;
- const c = 15;
- const a = [60, 180, 18000, 600, 1.2, 1.2];
-
- let best = { loss: Infinity };
- for (let i = 0; best.loss > 25 && i < 3; i++) {
- const initial = [50, 20, 3750, 50, 100, 100];
- const result = this.spsa(A, a, c, initial, 1000);
- if (result.loss < best.loss) {
- best = result;
- }
- }
- return best;
- }
-
- solveNarrow(wide) {
- const A = wide.loss;
- const c = 2;
- const A1 = A + 1;
- const a = [0.25 * A1, 0.25 * A1, A1, 0.25 * A1, 0.2 * A1, 0.2 * A1];
- return this.spsa(A, a, c, wide.values, 500);
- }
-
- spsa(A, a, c, values, iters) {
- const alpha = 1;
- const gamma = 0.16666666666666666;
-
- let best = null;
- let bestLoss = Infinity;
- const deltas = new Array(6);
- const highArgs = new Array(6);
- const lowArgs = new Array(6);
-
- for (let k = 0; k < iters; k++) {
- const ck = c / Math.pow(k + 1, gamma);
- for (let i = 0; i < 6; i++) {
- deltas[i] = Math.random() > 0.5 ? 1 : -1;
- highArgs[i] = values[i] + ck * deltas[i];
- lowArgs[i] = values[i] - ck * deltas[i];
- }
-
- const lossDiff = this.loss(highArgs) - this.loss(lowArgs);
- for (let i = 0; i < 6; i++) {
- const g = lossDiff / (2 * ck) * deltas[i];
- const ak = a[i] / Math.pow(A + k + 1, alpha);
- values[i] = fix(values[i] - ak * g, i);
- }
-
- const loss = this.loss(values);
- if (loss < bestLoss) {
- best = values.slice(0);
- bestLoss = loss;
- }
- }
- return { values: best, loss: bestLoss };
-
- function fix(value, idx) {
- let max = 100;
- if (idx === 2 /* saturate */) {
- max = 7500;
- } else if (idx === 4 /* brightness */ || idx === 5 /* contrast */) {
- max = 200;
- }
-
- if (idx === 3 /* hue-rotate */) {
- if (value > max) {
- value %= max;
- } else if (value < 0) {
- value = max + value % max;
- }
- } else if (value < 0) {
- value = 0;
- } else if (value > max) {
- value = max;
- }
- return value;
- }
- }
-
- loss(filters) {
- // Argument is array of percentages.
- const color = this.reusedColor;
- color.set(0, 0, 0);
-
- color.invert(filters[0] / 100);
- color.sepia(filters[1] / 100);
- color.saturate(filters[2] / 100);
- color.hueRotate(filters[3] * 3.6);
- color.brightness(filters[4] / 100);
- color.contrast(filters[5] / 100);
-
- const colorHSL = color.hsl();
- return (
- Math.abs(color.r - this.target.r) +
- Math.abs(color.g - this.target.g) +
- Math.abs(color.b - this.target.b) +
- Math.abs(colorHSL.h - this.targetHSL.h) +
- Math.abs(colorHSL.s - this.targetHSL.s) +
- Math.abs(colorHSL.l - this.targetHSL.l)
- );
- }
-
- css(filters) {
- function fmt(idx, multiplier = 1) {
- return Math.round(filters[idx] * multiplier);
- }
- return `filter: sepia(${fmt(1)}%) saturate(${fmt(2) / 10}%) hue-rotate(${fmt(3, 3.6)}deg)`;
- }
-}
-
-function hexToRgb(hex) {
- const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
- return result
- ? [
- parseInt(result[1], 16),
- parseInt(result[2], 16),
- parseInt(result[3], 16),
- ]
- : null;
-}
\ No newline at end of file
diff --git a/index.html b/index.html
index df23cda..a8102cc 100644
--- a/index.html
+++ b/index.html
@@ -48,4 +48,4 @@ Vedal forever enslaved by Neuro-sama
-