jnpf-app-vue3/components/Jnpf/Barcode/tki-barcode/barcode.js

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

export default barcode