Small design changes, introducing CSS colorization, doubleclick to edit markdown
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Magnus Åhall
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43212a4487
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5bd5ef1f02
9 changed files with 455 additions and 100 deletions
207
static/js/lib/css_colorize.mjs
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207
static/js/lib/css_colorize.mjs
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export class Color {
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constructor(r, g, b) { this.set(r, g, b); }
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toString() { return `rgb(${Math.round(this.r)}, ${Math.round(this.g)}, ${Math.round(this.b)})`; }
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set(r, g, b) {
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this.r = this.clamp(r);
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this.g = this.clamp(g);
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this.b = this.clamp(b);
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}
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hueRotate(angle = 0) {
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angle = angle / 180 * Math.PI;
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let sin = Math.sin(angle);
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let cos = Math.cos(angle);
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this.multiply([
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0.213 + cos * 0.787 - sin * 0.213, 0.715 - cos * 0.715 - sin * 0.715, 0.072 - cos * 0.072 + sin * 0.928,
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0.213 - cos * 0.213 + sin * 0.143, 0.715 + cos * 0.285 + sin * 0.140, 0.072 - cos * 0.072 - sin * 0.283,
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0.213 - cos * 0.213 - sin * 0.787, 0.715 - cos * 0.715 + sin * 0.715, 0.072 + cos * 0.928 + sin * 0.072
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]);
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}
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grayscale(value = 1) {
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this.multiply([
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0.2126 + 0.7874 * (1 - value), 0.7152 - 0.7152 * (1 - value), 0.0722 - 0.0722 * (1 - value),
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0.2126 - 0.2126 * (1 - value), 0.7152 + 0.2848 * (1 - value), 0.0722 - 0.0722 * (1 - value),
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0.2126 - 0.2126 * (1 - value), 0.7152 - 0.7152 * (1 - value), 0.0722 + 0.9278 * (1 - value)
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]);
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}
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sepia(value = 1) {
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this.multiply([
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0.393 + 0.607 * (1 - value), 0.769 - 0.769 * (1 - value), 0.189 - 0.189 * (1 - value),
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0.349 - 0.349 * (1 - value), 0.686 + 0.314 * (1 - value), 0.168 - 0.168 * (1 - value),
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0.272 - 0.272 * (1 - value), 0.534 - 0.534 * (1 - value), 0.131 + 0.869 * (1 - value)
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]);
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}
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saturate(value = 1) {
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this.multiply([
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0.213 + 0.787 * value, 0.715 - 0.715 * value, 0.072 - 0.072 * value,
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0.213 - 0.213 * value, 0.715 + 0.285 * value, 0.072 - 0.072 * value,
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0.213 - 0.213 * value, 0.715 - 0.715 * value, 0.072 + 0.928 * value
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]);
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}
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multiply(matrix) {
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let newR = this.clamp(this.r * matrix[0] + this.g * matrix[1] + this.b * matrix[2]);
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let newG = this.clamp(this.r * matrix[3] + this.g * matrix[4] + this.b * matrix[5]);
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let newB = this.clamp(this.r * matrix[6] + this.g * matrix[7] + this.b * matrix[8]);
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this.r = newR; this.g = newG; this.b = newB;
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}
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brightness(value = 1) { this.linear(value); }
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contrast(value = 1) { this.linear(value, -(0.5 * value) + 0.5); }
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linear(slope = 1, intercept = 0) {
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this.r = this.clamp(this.r * slope + intercept * 255);
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this.g = this.clamp(this.g * slope + intercept * 255);
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this.b = this.clamp(this.b * slope + intercept * 255);
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}
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invert(value = 1) {
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this.r = this.clamp((value + (this.r / 255) * (1 - 2 * value)) * 255);
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this.g = this.clamp((value + (this.g / 255) * (1 - 2 * value)) * 255);
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this.b = this.clamp((value + (this.b / 255) * (1 - 2 * value)) * 255);
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}
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hsl() { // Code taken from https://stackoverflow.com/a/9493060/2688027, licensed under CC BY-SA.
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let r = this.r / 255;
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let g = this.g / 255;
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let b = this.b / 255;
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let max = Math.max(r, g, b);
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let min = Math.min(r, g, b);
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let h, s, l = (max + min) / 2;
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if (max === min) {
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h = s = 0;
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} else {
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let d = max - min;
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s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
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switch (max) {
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case r: h = (g - b) / d + (g < b ? 6 : 0); break;
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case g: h = (b - r) / d + 2; break;
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case b: h = (r - g) / d + 4; break;
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} h /= 6;
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}
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return {
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h: h * 100,
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s: s * 100,
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l: l * 100
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};
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}
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clamp(value) {
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if (value > 255) { value = 255; }
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else if (value < 0) { value = 0; }
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return value;
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}
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}
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export class Solver {
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constructor(target) {
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this.target = target;
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this.targetHSL = target.hsl();
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this.reusedColor = new Color(0, 0, 0); // Object pool
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}
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solve() {
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let result = this.solveNarrow(this.solveWide());
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return {
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values: result.values,
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loss: result.loss,
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filter: this.css(result.values)
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};
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}
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solveWide() {
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const A = 5;
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const c = 15;
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const a = [60, 180, 18000, 600, 1.2, 1.2];
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let best = { loss: Infinity };
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for (let i = 0; best.loss > 25 && i < 3; i++) {
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let initial = [50, 20, 3750, 50, 100, 100];
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let result = this.spsa(A, a, c, initial, 1000);
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if (result.loss < best.loss) { best = result; }
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} return best;
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}
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solveNarrow(wide) {
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const A = wide.loss;
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const c = 2;
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const A1 = A + 1;
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const a = [0.25 * A1, 0.25 * A1, A1, 0.25 * A1, 0.2 * A1, 0.2 * A1];
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return this.spsa(A, a, c, wide.values, 500);
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}
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spsa(A, a, c, values, iters) {
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const alpha = 1;
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const gamma = 0.16666666666666666;
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let best = null;
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let bestLoss = Infinity;
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let deltas = new Array(6);
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let highArgs = new Array(6);
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let lowArgs = new Array(6);
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for (let k = 0; k < iters; k++) {
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let ck = c / Math.pow(k + 1, gamma);
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for (let i = 0; i < 6; i++) {
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deltas[i] = Math.random() > 0.5 ? 1 : -1;
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highArgs[i] = values[i] + ck * deltas[i];
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lowArgs[i] = values[i] - ck * deltas[i];
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}
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let lossDiff = this.loss(highArgs) - this.loss(lowArgs);
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for (let i = 0; i < 6; i++) {
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let g = lossDiff / (2 * ck) * deltas[i];
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let ak = a[i] / Math.pow(A + k + 1, alpha);
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values[i] = fix(values[i] - ak * g, i);
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}
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let loss = this.loss(values);
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if (loss < bestLoss) { best = values.slice(0); bestLoss = loss; }
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} return { values: best, loss: bestLoss };
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function fix(value, idx) {
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let max = 100;
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if (idx === 2 /* saturate */) { max = 7500; }
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else if (idx === 4 /* brightness */ || idx === 5 /* contrast */) { max = 200; }
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if (idx === 3 /* hue-rotate */) {
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if (value > max) { value = value % max; }
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else if (value < 0) { value = max + value % max; }
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} else if (value < 0) { value = 0; }
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else if (value > max) { value = max; }
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return value;
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}
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}
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loss(filters) { // Argument is array of percentages.
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let color = this.reusedColor;
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color.set(0, 0, 0);
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color.invert(filters[0] / 100);
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color.sepia(filters[1] / 100);
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color.saturate(filters[2] / 100);
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color.hueRotate(filters[3] * 3.6);
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color.brightness(filters[4] / 100);
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color.contrast(filters[5] / 100);
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let colorHSL = color.hsl();
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return Math.abs(color.r - this.target.r)
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+ Math.abs(color.g - this.target.g)
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+ Math.abs(color.b - this.target.b)
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+ Math.abs(colorHSL.h - this.targetHSL.h)
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+ Math.abs(colorHSL.s - this.targetHSL.s)
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+ Math.abs(colorHSL.l - this.targetHSL.l);
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}
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css(filters) {
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function fmt(idx, multiplier = 1) { return Math.round(filters[idx] * multiplier); }
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return `invert(${fmt(0)}%) sepia(${fmt(1)}%) saturate(${fmt(2)}%) hue-rotate(${fmt(3, 3.6)}deg) brightness(${fmt(4)}%) contrast(${fmt(5)}%)`;
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}
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}
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