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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>QR code data XOR mask</title>
<link rel="stylesheet" href="style.css">
<script src="script.js"></script>
</head>
<body>
<div id="options">
<select id="mask-expr">
<option value="(row+col)%2" selected>Mask 0-000 | (i + j) mod 2 = 0</option>
<option value="row%2">Mask 1-001 | i mod 2</option>
<option value="col%3">Mask 2-010 | j mod 3</option>
<option value="(row+col)%3">Mask 3-011 | (i + j) mod 3</option>
<option value="(row/2+col/3)%2">Mask 4-100 | (i : 2 + j : 3) mod 2</option>
<option value="(row*col)%2+(row*col)%3">Mask 5-101 | (i &times; j) mod 2 + (i &times; j) mod 3</option>
<option value="((row*col)%2+(row*col)%3)%2">Mask 6-110 | ((i &times; j) mod 2 + (i &times; j) mod 3) mod 2</option>
<option value="((row+col)%2+(row*col)%3)%2">Mask 7-111 | ((i + j) mod 2 + (i &times; j) mod 3) mod 2</option>
</select>
<label for="width" id="width-wrapper">
<span>Width:</span>
<input id="width" type="number" min="21" max="177" step="4" value="25">
<button id="width-incr">+</button>
<button id="width-decr">&ndash;</button>
<b>version <span id="version">2</span></b>
</label>
<label for="scale">
<span>Scale:</span>
<input id="scale" type="number" min="1" value="40">
px per module
</label>
<button id="gen-btn">Generate</button>
</div>
<div>
<canvas id="canvas" width="1" height="1"></canvas>
</div>
</body>
</html>

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addEventListener('DOMContentLoaded', () => {
const canvas = document.getElementById("canvas")
const ctx = canvas.getContext("2d")
ctx.fillStyle = "black"
const options = {
mask: document.getElementById("mask-expr"),
size: document.getElementById("width"),
ver: document.getElementById("version"),
}
document.getElementById("gen-btn").addEventListener("click", () => {
const mask = options.mask.value
const size = options.size.value
const scale = 40
canvas.width = canvas.height = size * scale
for (let row = 0; row < size; row++) {
for (let col = 0; col < size; col++) {
if (eval(mask) == 0) {
ctx.fillRect(col * scale, row * scale, scale, scale)
}
}
}
})
{ // Choose best scale for screen height
const height = document.documentElement.clientHeight;
const padding = getComputedStyle(document.body).paddingTop;
// TODO
}
{ // QR version related stuff
const MICRO_4 = 17 // size for version M4, before version 1
const DIFF = 4 // difference between versions
const MIN_VER = 1
const MAX_VER = 40
const getCodeVersion = () => {
const size = options.size.value
return Math.floor((size - MICRO_4) / DIFF)
}
const updateSizeVersion = (versionStep) => {
const ver = getCodeVersion() + versionStep
if (ver > MAX_VER || ver < MIN_VER) {
return
}
options.size.value = ver * DIFF + MICRO_4
options.ver.innerText = ver
}
document.getElementById("width-incr").addEventListener("click", () => {
updateSizeVersion(+1)
})
document.getElementById("width-decr").addEventListener("click", () => {
updateSizeVersion(-1)
})
options.size.addEventListener("input", () => {
options.ver.innerText = getCodeVersion()
})
}
})

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body {
margin: 0;
padding: 0.5rem;
}
#options {
display: flex;
flex-direction: column;
row-gap: 0.25rem;
width: fit-content;
max-width: calc(100vw - 0.5rem * 2);
margin: auto;
}
select, input, button {
width: fit-content;
max-width: 100%;
font-size: 1rem;
}
input[type=number] {
width: calc(1rem * 4 + 0.125rem * 2);
}
label {
display: flex;
flex-direction: row;
column-gap: 0.25rem;
}
label#width-wrapper > button {
padding: 0.0625rem 0.25rem;
width: calc(1rem + 0.25rem * 3);
}
label > span:nth-child(1) {
width: calc(3.5rem);
text-align: right;
}