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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Substitution System</title>
<script defer data-domain="piebro.github.io/substitution-system" src="https://plausible.io/js/script.js"></script>
<style>
canvas {
width:auto;
height:auto;
max-width: 92vw;
max-height: 86vh;
margin: auto;
display: block;
padding-top: 10px;
}
#button-container {
text-align: center;
float:center;
}
.btn {
background-color: #04AA6D;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.btn:hover{
background-color: #3e8e41;
}
</style>
</head>
<script>
function generateInitialMatrix(num_of_colors) {
// Creating a 2x2 matrix with random numbers between 0 and 5
let matrix = new Uint8Array(4);
for (let i = 0; i < matrix.length; i++) {
matrix[i] = Math.floor(Math.random() * num_of_colors);
}
return matrix;
}
function generateSubstitutionRules(num_of_colors) {
let rules = [];
for (let i = 0; i < num_of_colors; i++) {
let substitutionMatrix = new Uint8Array(4);
for (let j = 0; j < substitutionMatrix.length; j++) {
substitutionMatrix[j] = Math.floor(Math.random() * num_of_colors);
}
rules.push(substitutionMatrix);
}
return rules;
}
function applySubstitution(matrix, size, rules) {
let newSize = size * 2;
let newMatrix = new Uint8Array(newSize * newSize);
for (let y = 0; y < size; y++) {
for (let x = 0; x < size; x++) {
let number = matrix[y * size + x];
let substitution = rules[number];
// Place the substitution matrix
for (let dy = 0; dy < 2; dy++) {
for (let dx = 0; dx < 2; dx++) {
newMatrix[2 * y * newSize + 2 * x + dy * newSize + dx] = substitution[dy * 2 + dx];
}
}
}
}
return newMatrix;
}
function LCG(seed) {
this.seed = seed;
this.a = 1664525;
this.c = 1013904223;
this.m = Math.pow(2, 32);
this.next = function () {
this.seed = (this.a * this.seed + this.c) % this.m;
return this.seed / this.m;
};
}
function shuffle(array, rng) {
for (let i = array.length - 1; i > 0; i--) {
let j = Math.floor(rng.next() * (i + 1));
[array[i], array[j]] = [array[j], array[i]];
}
}
async function drawCurrentImage(downloadImageBool = false) {
[matrix, substitutionRules, colorMap, rngSeed] = dataCache[currentIndex];
let rng = rngSeed > 0 ? new LCG(rngSeed) : undefined;
let size = 2;
copySubstitutionRules = substitutionRules.map((innerArray) => innerArray.slice());
for (let i = 0; i < numOfSubstitutions; i++) {
matrix = applySubstitution(matrix, size, copySubstitutionRules);
if (rngSeed > 0) {
shuffle(copySubstitutionRules, rng);
}
size *= 2;
}
const offScreenCanvas = document.createElement('canvas');
offScreenCanvas.width = size;
offScreenCanvas.height = size;
const offScreenCtx = offScreenCanvas.getContext('2d');
const imageData = offScreenCtx.createImageData(size, size);
imageDataColor = [];
for (let y = 0; y < size; y++) {
imageDataColor.push([]);
for (let x = 0; x < size; x++) {
let index = (y * size + x) * 4;
let color = colorMap[matrix[y * size + x]];
imageDataColor[y].push(color);
imageData.data[index + 0] = color[0];
imageData.data[index + 1] = color[1];
imageData.data[index + 2] = color[2];
imageData.data[index + 3] = 255;
}
}
offScreenCtx.putImageData(imageData, 0, 0);
const canvas = document.getElementById('artCanvas');
canvas.width = 1024;
canvas.height = 1024;
const ctx = canvas.getContext('2d');
ctx.imageSmoothingEnabled = false;
ctx.drawImage(offScreenCanvas, 0, 0, canvas.width, canvas.height);
if (downloadImageBool) {
let downloadLink = document.createElement('a');
// this has to be this complicated way because of this:
// https://stackoverflow.com/questions/23497925/how-can-i-stop-the-alpha-premultiplication-with-canvas-imagedata/23501676#23501676
const imageDataList = await imageDataToPngPython(size, imageDataColor);
for (imageDataStr of imageDataList) {
downloadLink.href = 'data:image/png;base64,' + imageDataStr;
downloadLink.download = 'subsys.png';
document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);
}
}
}
async function imageDataToPngPython(size, imageDataColor) {
if (!window.pyodide) {
let script = document.createElement('script');
script.src = 'https://cdn.jsdelivr.net/pyodide/v0.25.0/full/pyodide.js';
document.head.appendChild(script);
await new Promise((resolve, reject) => {
script.onload = resolve;
script.onerror = reject;
});
window.pyodide = await loadPyodide();
await window.pyodide.runPythonAsync(`
import pyodide_js
await pyodide_js.loadPackage('pillow')
from PIL import Image
import io, base64
`);
}
window.pyodide.globals.set('image_data', imageDataColor);
await window.pyodide.runPythonAsync(`
size = len(image_data)
img = Image.new('RGB', (size, size))
pixels = img.load()
for y in range(size):
for x in range(size):
pixels[x, y] = tuple(image_data[y][x])
buffer = io.BytesIO()
img.save(buffer, format="PNG")
img_data_small = base64.b64encode(buffer.getvalue()).decode()
img = img.resize((1024, 1024), Image.NEAREST)
buffer = io.BytesIO()
img.save(buffer, format="PNG")
img_data_big = base64.b64encode(buffer.getvalue()).decode()
`);
const imgDataSmall = window.pyodide.globals.get('img_data_small');
const imgDataBig = window.pyodide.globals.get('img_data_big');
return [imgDataSmall, imgDataBig];
}
function addNewDataCacheEntry() {
const num_of_colors = 2 + Math.floor(Math.random() * 5);
const matrix = generateInitialMatrix(num_of_colors);
const substitutionRules = generateSubstitutionRules(num_of_colors);
const colorMaps = PREDEFINED_COLOR_PALETTES[num_of_colors - 2];
const colorMap = colorMaps[Math.floor(Math.random() * colorMaps.length)];
const rngSeed = 0;
dataCache.push([matrix, substitutionRules, colorMap, rngSeed]);
}
function nextImage() {
currentIndex += 1;
if (dataCache.length == currentIndex) {
addNewDataCacheEntry();
}
drawCurrentImage();
}
function previousImage() {
currentIndex -= 1;
if (currentIndex < 0) {
currentIndex = 0;
}
dataCache[currentIndex][3] = 0;
drawCurrentImage();
}
function changeRngSeed() {
dataCache[currentIndex][3] = Math.ceil(Math.random() * 10000);
drawCurrentImage();
}
function downloadImage() {
drawCurrentImage(true);
}
function reduceNumOfSubstitutions() {
numOfSubstitutions = Math.max(0, numOfSubstitutions - 1);
drawCurrentImage();
}
function addNumOfSubstitutions() {
numOfSubstitutions = Math.min(11, numOfSubstitutions + 1);
drawCurrentImage();
}
function onKeyDown(e) {
if (e.code == 'ArrowRight') {
nextImage();
} else if (e.code == 'ArrowLeft') {
previousImage();
} else if (e.code == 'KeyV') {
changeRngSeed();
} else if (e.code == 'KeyS') {
downloadImage();
}
}
function onWheel(e) {
// Zoom in
if (e.deltaY < 0) {
reduceNumOfSubstitutions();
}
// Zoom out
else if (e.deltaY > 0) {
addNumOfSubstitutions();
}
}
async function init() {
document.addEventListener('keydown', onKeyDown);
document.addEventListener('wheel', onWheel, { passive: true });
nextImage();
}
dataCache = [];
currentIndex = -1;
numOfSubstitutions = 4;
const PREDEFINED_COLOR_PALETTES = [
[
[
[45, 125, 210],
[151, 204, 4],
],
[
[109, 33, 60],
[148, 104, 70],
],
[
[84, 69, 127],
[172, 123, 132],
],
[
[13, 59, 102],
[250, 240, 202],
],
[
[20, 70, 160],
[219, 48, 105],
],
[
[255, 102, 102],
[204, 255, 102],
],
[
[37, 22, 5],
[197, 123, 87],
],
[
[53, 53, 53],
[255, 255, 255],
],
[
[52, 52, 74],
[128, 71, 94],
],
[
[233, 215, 88],
[41, 115, 115],
],
[
[194, 193, 194],
[66, 33, 61],
],
[
[51, 55, 69],
[230, 52, 98],
],
[
[13, 59, 102],
[250, 240, 202],
],
[
[245, 93, 62],
[135, 142, 136],
],
[
[254, 74, 73],
[42, 183, 202],
],
[
[68, 69, 69],
[181, 255, 233],
],
[
[137, 182, 165],
[76, 59, 77],
],
[
[240, 93, 94],
[15, 113, 115],
],
[
[80, 81, 79],
[180, 173, 234],
],
],
[
[
[255, 78, 0],
[142, 166, 4],
[245, 187, 0],
],
[
[165, 70, 87],
[88, 38, 48],
[247, 238, 127],
],
[
[70, 77, 119],
[54, 130, 127],
[249, 219, 109],
],
[
[38, 70, 83],
[42, 157, 143],
[233, 196, 106],
],
[
[239, 118, 122],
[69, 105, 144],
[73, 190, 170],
],
[
[236, 164, 0],
[234, 248, 191],
[0, 105, 146],
],
[
[239, 148, 108],
[196, 167, 125],
[112, 135, 127],
],
[
[49, 55, 21],
[209, 96, 20],
[147, 159, 92],
],
[
[68, 43, 72],
[114, 110, 96],
[152, 176, 111],
],
[
[0, 42, 50],
[196, 162, 158],
[235, 166, 169],
],
[
[81, 163, 163],
[117, 72, 94],
[203, 144, 77],
],
[
[13, 59, 102],
[250, 240, 202],
[244, 211, 94],
],
[
[242, 197, 124],
[221, 174, 126],
[127, 182, 133],
],
[
[40, 83, 107],
[194, 148, 138],
[126, 168, 190],
],
[
[58, 46, 57],
[30, 85, 92],
[244, 216, 205],
],
[
[255, 166, 158],
[255, 126, 107],
[140, 94, 88],
],
[
[244, 208, 111],
[255, 136, 17],
[157, 217, 210],
],
[
[251, 254, 249],
[25, 25, 35],
[14, 121, 178],
],
[
[191, 78, 48],
[198, 204, 178],
[9, 56, 36],
],
],
[
[
[236, 11, 67],
[88, 53, 94],
[122, 231, 199],
[214, 255, 183],
],
[
[191, 174, 72],
[95, 173, 65],
[45, 147, 108],
[57, 20, 99],
],
[
[201, 203, 163],
[255, 225, 168],
[226, 109, 92],
[114, 61, 70],
],
[
[215, 38, 61],
[2, 24, 43],
[1, 151, 246],
[68, 143, 163],
],
[
[4, 42, 43],
[94, 177, 191],
[205, 237, 246],
[239, 123, 69],
],
[
[84, 13, 110],
[238, 66, 102],
[255, 210, 63],
[243, 252, 240],
],
[
[255, 185, 151],
[246, 126, 125],
[132, 59, 98],
[11, 3, 45],
],
[
[6, 7, 14],
[41, 82, 74],
[148, 161, 135],
[197, 175, 160],
],
[
[241, 191, 152],
[225, 244, 203],
[186, 203, 169],
[113, 117, 104],
],
[
[204, 215, 197],
[239, 210, 203],
[199, 162, 124],
[214, 87, 128],
],
[
[236, 235, 228],
[204, 153, 141],
[22, 244, 208],
[66, 158, 166],
],
[
[0, 71, 119],
[163, 0, 0],
[255, 119, 0],
[239, 210, 141],
],
[
[171, 169, 191],
[190, 183, 223],
[212, 242, 210],
[52, 17, 63],
],
],
[
[
[214, 255, 183],
[245, 255, 144],
[255, 193, 94],
[255, 159, 28],
[8, 3, 87],
],
[
[82, 72, 156],
[64, 98, 187],
[89, 195, 195],
[235, 235, 235],
[244, 91, 105],
],
[
[238, 96, 85],
[96, 211, 148],
[170, 246, 131],
[255, 217, 125],
[255, 155, 133],
],
[
[85, 221, 224],
[51, 101, 138],
[47, 72, 88],
[246, 174, 45],
[242, 100, 25],
],
[
[252, 222, 156],
[255, 165, 82],
[186, 86, 36],
[56, 29, 42],
[196, 214, 176],
],
[
[28, 49, 68],
[208, 0, 0],
[255, 186, 8],
[162, 174, 187],
[63, 136, 197],
],
[
[172, 243, 157],
[232, 95, 92],
[156, 255, 250],
[119, 51, 68],
[227, 181, 164],
],
],
[
[
[109, 211, 206],
[200, 233, 160],
[247, 162, 120],
[161, 61, 99],
[53, 30, 41],
[46, 40, 42],
],
[
[116, 179, 206],
[80, 137, 145],
[23, 42, 58],
[0, 67, 70],
[9, 188, 138],
[189, 160, 188],
],
[
[111, 29, 27],
[187, 148, 87],
[67, 40, 24],
[153, 88, 42],
[255, 230, 167],
[2, 8, 135],
],
[
[109, 33, 60],
[148, 104, 70],
[186, 171, 104],
[227, 193, 111],
[250, 255, 112],
[255, 169, 231],
],
[
[191, 180, 143],
[86, 78, 88],
[144, 78, 85],
[242, 239, 233],
[37, 38, 39],
[151, 223, 252],
],
[
[15, 163, 177],
[217, 229, 214],
[237, 222, 164],
[247, 160, 114],
[255, 155, 66],
[224, 141, 172],
],
[
[82, 65, 76],
[89, 97, 87],
[91, 140, 90],
[207, 209, 134],
[227, 101, 91],
[214, 122, 177],
],
],
[
[
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[128, 141, 142],
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];
</script>
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<h1>Substitution System</h1>
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