const barcodes = require('./barcodes/index.js')['default'];
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let barcode = {};
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(function () {
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// 初始化
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barcode = function (cont, ctxid, options, ctxsize, result) {
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let ops = {}, newOptions, encodings, globaContext, ctx, globaCtxid, cbCanvasSize, cbResult;
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globaCtxid = ctxid
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cbCanvasSize = ctxsize
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cbResult = result
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newOptions = Object.assign(ops, options);
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// 修成margin
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fixMargin(newOptions)
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// 处理options 数据
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if (newOptions.text == '' || cont == '') {
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return false
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}
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// 获取ctx
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globaContext = cont
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ctx = uni.createCanvasContext(globaCtxid, globaContext)
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// 获取编码数据
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encodings = new barcodes[newOptions.format.toUpperCase()](newOptions.text, newOptions).encode()
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let fixencodings = fixEncodings(encodings, newOptions)
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// 返回canvas实际大小
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cbCanvasSize({ width: fixencodings.width, height: fixencodings.height })
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// 绘制canvas
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setTimeout(() => {
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drawCanvas.render(newOptions, fixencodings)
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}, 50);
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// 绘制canvas
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let drawCanvas = {
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render(options, encoding) {
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this.prepare(options, encoding)
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encoding.encodings.forEach((v, i) => {
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this.barcode(options, v)
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this.text(options, v)
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this.move(v)
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});
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this.draw(options, encoding)
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},
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barcode(options, encoding) {
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let binary = encoding.data;
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let yFrom;
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if (options.textPosition == "top") {
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yFrom = options.marginTop + options.fontSize + options.textMargin;
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} else {
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yFrom = options.marginTop;
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}
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// 绘制条码
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ctx.fillStyle = options.lineColor;
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for (let b = 0; b < binary.length; b++) {
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let x = b * options.width + encoding.barcodePadding;
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let height = options.height
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if (encoding.options) {
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if (encoding.options.height != undefined) {
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height = encoding.options.height
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}
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}
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if (binary[b] === "1") {
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ctx.fillRect(x, yFrom, options.width, height);
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} else if (binary[b]) {
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ctx.fillRect(x, yFrom, options.width, height * binary[b]);
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}
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}
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},
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text(options, encoding) {
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if (options.displayValue) {
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let x, y, align, size;
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if (options.textPosition == "top") {
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y = options.marginTop + options.fontSize;
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} else {
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y = options.height + options.textMargin + options.marginTop + options.fontSize;
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}
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if (encoding.options) {
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if (encoding.options.textAlign != undefined) {
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align = encoding.options.textAlign
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}
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if (encoding.options.fontSize != undefined) {
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size = encoding.options.fontSize
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}
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} else {
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align = options.textAlign
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size = options.fontSize
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}
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ctx.setFontSize(size)
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if (align == "left" || encoding.barcodePadding > 0) {
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x = 0;
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ctx.setTextAlign('left')
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} else if (align == "right") {
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x = encoding.width - 1;
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ctx.setTextAlign('right')
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}
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else {
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x = encoding.width / 2;
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ctx.setTextAlign('center');
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}
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ctx.fillStyle = options.fontColor;
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if (encoding.text != undefined) {
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ctx.fillText(encoding.text, x, y);
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}
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}
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},
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move(encoding) {
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ctx.translate(encoding.width, 0);
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},
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prepare(options, encoding) {
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// 绘制背景
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if (options.background) {
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ctx.fillStyle = options.background;
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ctx.fillRect(0, 0, encoding.width, encoding.height);
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}
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ctx.translate(options.marginLeft, 0);
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},
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draw(options, encoding) {
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ctx.draw(false, () => {
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this.toImgs(options, encoding)
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})
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},
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toImgs(options, encoding) {
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setTimeout(() => {
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uni.canvasToTempFilePath({
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width: encoding.width,
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height: encoding.height,
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destWidth: encoding.width,
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destHeight: encoding.height,
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canvasId: globaCtxid,
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fileType: 'png',
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success: function (res) {
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cbResult(res.tempFilePath)
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},
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fail: function (res) {
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cbResult(res)
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},
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complete: function () {
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// uni.hideLoading();
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},
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}, globaContext);
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}, options.text.length + 100);
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}
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}
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// 混入canvas数据
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function fixEncodings(encoding, options) {
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let encodingArr = [], width = options.marginLeft + options.marginRight, height;
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if (!Array.isArray(encoding)) {
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encodingArr[0] = JSON.parse(JSON.stringify(encoding))
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} else {
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encodingArr = [...encoding]
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}
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encodingArr.forEach((v, i) => {
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// 获取文本宽度
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let textWidth = ctx.measureText(encodingArr[i].text ? encodingArr[i].text : '').width;
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// 获取条形码宽度
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let barcodeWidth = encodingArr[i].data.length * options.width;
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// 获取内边距
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let barcodePadding = 0;
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if (options.displayValue && barcodeWidth < textWidth) {
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if (options.textAlign == "center") {
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barcodePadding = Math.floor((textWidth - barcodeWidth) / 2);
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} else if (options.textAlign == "left") {
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barcodePadding = 0;
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} else if (options.textAlign == "right") {
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barcodePadding = Math.floor(textWidth - barcodeWidth);
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}
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}
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// 混入encodingArr[i]
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encodingArr[i].barcodePadding = barcodePadding
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encodingArr[i].width = Math.ceil(Math.max(textWidth, barcodeWidth))
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width += encodingArr[i].width
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if (encodingArr[i].options) {
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if (encodingArr[i].options.height != undefined) {
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encodingArr[i].height = encodingArr[i].options.height + (options.displayValue && (encodingArr[i].text ? encodingArr[i].text : '').length > 0 ? options.fontSize + options.textMargin : 0) + options.marginTop + options.marginBottom;
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} else {
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encodingArr[i].height = height = options.height + (options.displayValue && (encodingArr[i].text ? encodingArr[i].text : '').length > 0 ? options.fontSize + options.textMargin : 0) + options.marginTop + options.marginBottom;
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}
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} else {
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encodingArr[i].height = height = options.height + (options.displayValue && (encodingArr[i].text ? encodingArr[i].text : '').length > 0 ? options.fontSize + options.textMargin : 0) + options.marginTop + options.marginBottom;
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}
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});
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return { encodings: encodingArr, width, height };
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}
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// 修正Margin
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function fixMargin(options) {
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options.marginTop = options.marginTop == undefined ? options.margin : options.marginTop;
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options.marginBottom = options.marginBottom == undefined ? options.margin : options.marginBottom;
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options.marginRight = options.marginRight == undefined ? options.margin : options.marginRight;
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options.marginLeft = options.marginLeft == undefined ? options.margin : options.marginLeft;
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}
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};
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})()
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export default barcode
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