44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
module.exports.renderBits = renderBits;
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function renderBits(bits,width,options) {
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if (typeof bits === 'undefined' || !(bits instanceof Array)) {
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throw new Error('"bits" must be a valid Array');
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}
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if (typeof bits === 'undefined' || isNaN(width)) {
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throw new Error('"width" must be a valid number');
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}
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var dotsize = options.scale || 4;
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var margin = options.margin || 20;
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var qrcodesize = width * dotsize + margin * 2;
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var lightColor = options.lightColor || '#ffffff';
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var darkColor = options.darkColor || '#000000';
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var xmlStr = '<?xml version="1.0" encoding="utf-8"?>\n';
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xmlStr += '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n';
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xmlStr += '<svg version="1.1" baseProfile="full"';
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xmlStr += ' width="' + qrcodesize + '" height="' + qrcodesize + '"';
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xmlStr += ' viewBox="0 0 '+ qrcodesize + ' ' + qrcodesize + '"';
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xmlStr += ' xmlns="http://www.w3.org/2000/svg"';
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xmlStr += ' xmlns:xlink="http://www.w3.org/1999/xlink"';
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xmlStr += ' xmlns:ev="http://www.w3.org/2001/xml-events">\n';
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xmlStr += '<rect x="0" y="0" width="' + qrcodesize + '" height="' + qrcodesize + '" fill="' + lightColor + '" />\n';
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xmlStr += '<defs><rect id="p" width="'+ dotsize +'" height="'+ dotsize + '" /></defs>\n';
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xmlStr += '<g fill="' + darkColor + '">\n';
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xmlStr = bits.reduce(function (xml, bit, index) {
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if (!bit) return xml;
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var x = margin + (index % width) * dotsize;
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var y = margin + Math.floor(index / width) * dotsize;
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return xml += '<use x="' + x + '" y="' + y + '" xlink:href="#p" />\n'
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}, xmlStr);
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xmlStr += '</g>\n';
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xmlStr += '</svg>';
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return xmlStr
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}
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