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绘制二维码添加中间头像Logo

发布时间:2020-10-30

onLoad: function (options) { /** * 绘制带logo二维码 * @param url 二维码字符串如 https://github.com/xlsn0w * @param canvas-id 画布ID 如 logoQRCode * @param width 二维码宽度如 275 * @param height 二维码高度如 275 * @param logo 二维码logo 如 /images/xlsn0w.png */ QRCodeJS.qrApi.draw('https://github.com/xlsn0w', "logoQRCode", 275, 275, null, '/images/xlsn0w.png'); }代码

var drawImg = function (src, width,ctx) { var imgSize = width / 5; var imgPos = width / 10 * 4; var imgPosFix = width / 120; ctx.strokeStyle = '#fff'; ctx.lineWidth = 1; ctx.globalAlpha = 0.8; ctx.lineCap = "round"; ctx.lineJoin = "round"; ctx.beginPath(); ctx.moveTo(imgPos - imgPosFix, imgPos - imgPosFix); ctx.lineTo(imgPos + imgSize + imgPosFix, imgPos - imgPosFix); ctx.lineTo(imgPos + imgSize + imgPosFix, imgPos + imgSize + imgPosFix); ctx.lineTo(imgPos - imgPosFix, imgPos + imgSize + imgPosFix); ctx.lineTo(imgPos - imgPosFix, imgPos - imgPosFix); ctx.stroke(); ctx.closePath(); ctx.drawImage(src, imgPos, imgPos, imgSize, imgSize); ctx.beginPath(); } var _canvas = null; var api = { get ecclevel() { return ecclevel; }, set ecclevel(val) { ecclevel = val; }, get size() { return _size; }, set size(val) { _size = val }, get canvas() { return _canvas; }, set canvas(el) { _canvas = el; }, getFrame: function (string) { return genframe(string); }, //这里的utf16to8(str)是对Text中的字符串进行转码，让其支持中文 utf16to8: function (str) { var out, i, len, c; out = ""; len = str.length; for (i = 0; i < len; i++) { c = str.charCodeAt(i); if ((c >= 0x0001) && (c <= 0x007F)) { out += str.charAt(i); } else if (c > 0x07FF) { out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F)); out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); } else { out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F)); out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F)); } } return out; }, draw: function (str, canvas, cavW, cavH, ecc,src) { ecclevel = ecc || ecclevel; canvas = canvas || _canvas; if (!canvas) { console.warn('No canvas provided to draw QR code in!') return; } var size = Math.min(cavW, cavH); str = this.utf16to8(str);//增加中文显示 //console.log(str) var frame = this.getFrame(str), ctx = wx.createCanvasContext(canvas), px = Math.round(size / (width + 8)); var roundedSize = px * (width + 8), offset = Math.floor((size - roundedSize) / 2); size = roundedSize; ctx.clearRect(0, 0, cavW, cavW); ctx.setFillStyle('#000000'); for (var i = 0; i < width; i++) { for (var j = 0; j < width; j++) { if (frame[j * width + i]) { ctx.fillRect(px * (4 + i) + offset, px * (4 + j) + offset, px, px); } } } drawImg(src, cavW,ctx); ctx.draw(); } }

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