Add a basic color palette generator
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parent
03a8ae9a24
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slop/palette/.gitignore
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slop/palette/.gitignore
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node_modules/
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palette.png
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184
slop/palette/index.mjs
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slop/palette/index.mjs
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import Color from "colorjs.io/dist/color.js";
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import {PNG} from "pngjs";
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import fs from "fs";
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function generateColors() {
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let pad = function(n) {
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while (colors.length < n) {
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colors.push(new Color("slategray"));
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}
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}
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let band = function(colors) {
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return function(point, shimmer) {
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point += shimmer;
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var ix2 = point * colors.length;
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while (ix2 < 0) { ix2 += colors.length; }
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return colors[Math.floor(ix2) % colors.length].mix(
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colors[Math.floor(ix2 + 1) % colors.length],
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ix2 % 1,
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{"space": "oklch", "outputSpace": "oklab"}
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)
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}
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}
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let ramp = function(start, c0, c1, c2) {
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// deep base -> center -> pastel
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var r01 = c0.range(c1, {space: "oklab", outputSpace: "oklch"});
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var r12 = c1.range(c2, {space: "oklab", outputSpace: "oklch"});
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var n = 5;
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var i = 0;
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for (var amt = 0; amt < n; amt++) {
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colors[start + i * 8] = r01(amt/(n - 1));
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i += 1;
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}
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n = 3;
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for (var amt = 1; amt < n; amt++) {
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colors[start + i * 8] = r12(amt/(n - 1));
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i += 1;
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}
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}
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var colors = [];
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// we were originally appending these
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// but for now, just prefill all the slots
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pad(64); // so the slots are filled and we can replace them
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// system colors
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colors[0] = new Color("#000000");
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colors[1] = new Color("#0000ff");
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colors[2] = new Color("#00ff00");
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colors[3] = new Color("#00ffff");
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colors[4] = new Color("#ff0000");
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colors[5] = new Color("#ff00ff");
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colors[6] = new Color("#ffff00");
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colors[7] = new Color("#ffffff");
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for (var i = 0; i < 8; i++) {
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// colors[i].hsv.h += 135.0;
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}
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let lowBand = band([
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new Color("oklch(11.2% 0.0744 268.04)"),
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new Color("oklch(15.55% 0.0782 310.39)"),
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new Color("oklch(21.51% 0.0864 357.28)"),
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new Color("oklch(22.74% 0.0755 43.16)"),
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new Color("oklch(23.84% 0.0733 145.59)"),
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new Color("oklch(27.4% 0.0444 171.2)"), // NOTE: This reproduces terribly
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new Color("oklch(19.1% 0.0396 233.51)"), // NOTE: This reproduces terribly
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new Color("oklch(18.63% 0.0575 259.12)"), // NOTE: This reproduces terribly
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]);
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let middleBand = band([
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new Color("oklch(55.34% 0.241 291.34)"),
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new Color("oklch(58.54% 0.1994 330.82)"),
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new Color("oklch(63.2% 0.2135 20.28)"),
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new Color("oklch(80.34% 0.16 70.47)"),
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new Color("oklch(91.95% 0.23681720512967358 126.89394948265881)"),
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new Color("oklch(87.99% 0.2353 147.34)"),
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new Color("oklch(86.44% 0.1505 187.42)"),
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new Color("oklch(74.91% 0.1505 235.22)"),
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]);
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let highBand = band([
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new Color("oklch(92.3% 0.041 317.16)"),
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new Color("oklch(94.93% 0.0217 358.04)"),
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new Color("oklch(95.21% 0.0101 7.31)"),
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new Color("oklch(98.41% 0.0172 88.4)"),
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new Color("oklch(99.58% 0.00969628196819721 125.6732391579389)"),
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new Color("oklch(97.53% 0.0584 127.22)"),
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new Color("oklch(96.38% 0.0465 167.45)"),
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new Color("oklch(95.21% 0.0475 214.73)"),
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]);
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for (var i = 0; i < 4; i++) {
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var lowRampIx = (i - 0.25) / 4;
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var low = lowBand(lowRampIx, -0.3);
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var middle = middleBand(lowRampIx, 0.0);
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colors[8 + i * 2] = low.mix(middle, 0.2/4.0, {space: "oklab"})
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colors[8 + i * 2 + 1] = low.mix(middle, 0.8/4.0, {space: "oklab"})
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colors[8 + i * 2].oklch.c *= 0.4;
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colors[8 + i * 2 + 1].oklch.c *= 0.5;
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}
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for (var i = 0; i < 4; i++) {
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for (var c = 1; c < 3; c++) {
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var lowRampIx = (i - 0.25) / 4;
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var low = lowBand(lowRampIx, -0.3);
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var middle = middleBand(lowRampIx, 0.0);
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var cbase = low.mix(middle, ([2.1, 3.1, 4.0][c - 1])/4, {space: "oklab"})
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colors[8 + i * 2 + c * 8] = cbase
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var color2 = low.mix(middle, ([1.7, 2.7, 3.5][c - 1])/4, {space: "oklab"})
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color2.oklch.c *= 0.6
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colors[8 + i * 2 + 1 + c * 8] = color2;
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}
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}
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for (var i = 0; i < 8; i++) {
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colors[32 + i] = middleBand((i - 1) / 8, 0.0);
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colors[32 + i + 8] =
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middleBand((i - 1) / 8, 0.0).mix(highBand((i - 1) / 8, 0.15), 1.5/5, {space: "oklch"})
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}
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for (var i = 0; i < 4; i++) {
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var highRampIx = (i - 0.25) / 4;
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colors[48 + i * 2] =
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middleBand(highRampIx, 0.0).mix(highBand(highRampIx, 0.15), 2.4/5, {space: "oklch"})
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colors[48 + i * 2 + 1] =
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middleBand(highRampIx, 0.0).mix(highBand(highRampIx, 0.15), 3.4/5, {space: "oklch"})
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colors[48 + i * 2 + 1].lch.c *= 0.7
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}
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for (var i = 0; i < 4; i++) {
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var highRampIx = (i - 0.25) / 4;
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colors[56 + i * 2] =
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middleBand(highRampIx, 0.0).mix(highBand(highRampIx, 0.15), 4.3/5, {space: "oklch"})
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colors[56 + i * 2].lch.c *= 0.6
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colors[56 + i * 2 + 1] =
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middleBand(highRampIx, 0.0).mix(highBand(highRampIx, 0.1), 5/5, {space: "oklch"})
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colors[56 + i * 2 + 1].lch.c *= 0.4
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colors[56 + i * 2].lch.l =
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colors[56 + i * 2].lch.l * 0.25 +
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colors[56 + i * 2 + 1].lch.l * 0.75
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}
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/*
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for (var i = 0; i < 8; i++) {
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colors[8 + i] = middleBand(i/8.0);
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}
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*/
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return colors;
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}
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function dump(fname, colors, width, height, scalar) {
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if (colors.length != width * height) {
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throw new Error("wrong number of colors: " + colors.length);
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}
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let pngdata = [];
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let clamp = function(x) {
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if (x < 0.0) { return 0.0; }
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if (x > 255.0) { return 255.0; }
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return Math.round(x);
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}
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for (var y = 0; y < height * scalar; y++) {
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for (var x = 0; x < width * scalar; x++) {
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let i = Math.floor(y / scalar) * width + Math.floor(x / scalar);
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pngdata.push(clamp(255 * colors[i].srgb.r));
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pngdata.push(clamp(255 * colors[i].srgb.g));
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pngdata.push(clamp(255 * colors[i].srgb.b));
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pngdata.push(255);
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}
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}
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var png = new PNG({
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width: width * scalar,
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height: height * scalar
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});
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png.data = pngdata;
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png.pack().pipe(fs.createWriteStream(fname));
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}
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dump("palette.png", generateColors(), 8, 8, 64);
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30
slop/palette/package-lock.json
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slop/palette/package-lock.json
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{
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"name": "palette",
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"version": "1.0.0",
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"lockfileVersion": 3,
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"requires": true,
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"packages": {
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"": {
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"name": "palette",
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"version": "1.0.0",
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"license": "ISC",
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"dependencies": {
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"colorjs.io": "^0.5.0",
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"pngjs": "^7.0.0"
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}
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},
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"node_modules/colorjs.io": {
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"version": "0.5.0",
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"resolved": "https://registry.npmjs.org/colorjs.io/-/colorjs.io-0.5.0.tgz",
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"integrity": "sha512-qekjTiBLM3F/sXKks/ih5aWaHIGu+Ftel0yKEvmpbKvmxpNOhojKgha5uiWEUOqEpRjC1Tq3nJRT7WgdBOxIGg=="
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},
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"node_modules/pngjs": {
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"version": "7.0.0",
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"resolved": "https://registry.npmjs.org/pngjs/-/pngjs-7.0.0.tgz",
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"integrity": "sha512-LKWqWJRhstyYo9pGvgor/ivk2w94eSjE3RGVuzLGlr3NmD8bf7RcYGze1mNdEHRP6TRP6rMuDHk5t44hnTRyow==",
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"engines": {
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"node": ">=14.19.0"
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}
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}
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}
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}
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slop/palette/package.json
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slop/palette/package.json
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{
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"name": "palette",
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"version": "1.0.0",
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"description": "",
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"main": "index.js",
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"scripts": {
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"main": "node index.mjs",
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"author": "",
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"license": "ISC",
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"dependencies": {
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"colorjs.io": "^0.5.0",
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"pngjs": "^7.0.0"
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}
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}
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