mirror of
https://github.com/the-djmaze/snappymail.git
synced 2024-09-20 15:45:55 +08:00
63 lines
2 KiB
JavaScript
63 lines
2 KiB
JavaScript
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(()=>{
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const size = 50,
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margin = 0.08;
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window.identiconSvg = (hash, txt) => {
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// color defaults to last 7 chars as hue at 70% saturation, 50% brightness
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// hsl2rgb adapted from: https://gist.github.com/aemkei/1325937
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let h = (parseInt(hash.substr(-7), 16) / 0xfffffff) * 6, s = 0.7, l = 0.5,
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v = [
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l += s *= l < .5 ? l : 1 - l,
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l - h % 1 * s * 2,
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l -= s *= 2,
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l,
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l + h % 1 * s,
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l + s
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],
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m = txt ? 128 : 255,
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color = 'rgb(' + [
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v[ ~~h % 6 ] * m, // red
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v[ (h | 16) % 6 ] * m, // green
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v[ (h | 8) % 6 ] * m // blue
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].map(Math.round).join(',') + ')';
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if (txt) {
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txt = `<svg xmlns="http://www.w3.org/2000/svg" width="${size}px" height="${size}px" viewBox="0 0 ${size} ${size}" version="1.1">
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<circle fill="${color}" width="${size}" height="${size}" cx="${size/2}" cy="${size/2}" r="${size/2}"/>
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<text x="${size}%" y="${size}%" style="color:#FFF" alignment-baseline="middle" text-anchor="middle"
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font-weight="bold" font-size="${Math.round(size*0.5)}"
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dy=".1em" dominant-baseline="middle" fill="#FFF">${txt}</text>
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</svg>`;
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} else {
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const cell = Math.floor((size - ((Math.floor(size * margin)) * 2)) / 5),
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imargin = Math.floor((size - cell * 5) / 2),
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rectangles = [],
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add = (x, y) => rectangles.push("<rect x='" + (x * cell + imargin)
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+ "' y='" + (y * cell + imargin)
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+ "' width='" + cell + "' height='" + cell + "'/>");
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// the first 15 characters of the hash control the pixels (even/odd)
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// they are drawn down the middle first, then mirrored outwards
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for (let i = 0; i < 15; ++i) {
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if (!(parseInt(hash.charAt(i), 16) % 2)) {
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if (i < 5) {
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add(2, i);
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} else if (i < 10) {
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add(1, (i - 5));
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add(3, (i - 5));
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} else {
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add(0, (i - 10));
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add(4, (i - 10));
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}
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}
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}
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txt = "<g style='fill:" + color + "; stroke:" + color + "; stroke-width:" + (size * 0.005) + ";'>"
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+ rectangles.join('')
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+ "</g>";
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}
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return "<svg xmlns='http://www.w3.org/2000/svg' width='" + size + "' height='" + size + "'>" + txt + "</svg>";
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};
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})();
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