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261 lines
7.1 KiB
261 lines
7.1 KiB
<template> |
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<view style="background: #FFFFFF;"> |
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<canvas v-if="!tempFilePath" :canvas-id="CanvasID" :style="{ width: canvasW + 'px', height: canvasH + 'px' }"></canvas> |
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<image v-else lazy-load :src="tempFilePath" mode="widthFix" class="is-response" @longpress="toSave(tempFilePath)"></image> |
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</view> |
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</template> |
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<script> |
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var _this; |
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export default { |
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name: 'wm-poster', |
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props: { |
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CanvasID: { //CanvasID 等同于 canvas-id |
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Type: String, |
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default: 'PosterCanvas' |
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}, |
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imgSrc: { //展示图 |
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Type: String, |
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default: '' |
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}, |
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QrSrc: { //二维码 |
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Type: String, |
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default: '' |
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}, |
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Title: { //文本内容 |
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Type: String, |
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default: '省钱兄霸王餐' |
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}, |
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TitleColor: { //标题颜色 |
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Type: String, |
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default: '#000000' |
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}, |
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LineType: { //标题显示行数 （注超出2行显示会导致画布布局絮乱） |
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Type: [String, Boolean], |
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default: true |
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}, |
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PriceTxt: { //价格值 |
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Type: String, |
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default: '99.99' |
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}, |
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PriceColor: { //价格颜色 |
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Type: String, |
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default: '#e31d1a' |
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}, |
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OriginalTxt: { //原价值 |
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Type: String, |
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default: '199.99' |
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}, |
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OriginalColor: { //默认颜色（如原价与扫描二维码颜色） |
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Type: String, |
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default: '#b8b8b8' |
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}, |
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Width: { //画布宽度 (高度根据图片比例计算 单位upx) |
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Type: String, |
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default: 700 |
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}, |
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CanvasBg: { //canvas画布背景色 |
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Type: String, |
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default: '#ffffff' |
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}, |
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Referrer: { //推荐人信息 |
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Type: String, |
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default: '省钱兄霸王餐精选好物' |
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}, |
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ViewDetails: { //描述提示文字 |
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Type: String, |
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default: '长按或扫描二维码免费领取' |
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} |
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}, |
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data() { |
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return { |
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tempFilePath: '', |
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canvasW: 0, |
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canvasH: 0, |
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canvasImgSrc: '', |
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ctx: null |
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}; |
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}, |
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methods: { |
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toSave(url) { |
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//#ifndef H5 |
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uni.getImageInfo({ |
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src: url, |
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success: function(image) { |
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console.log('图片信息：', JSON.stringify(image)); |
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uni.saveImageToPhotosAlbum({ |
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filePath: image.path, |
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success: function() { |
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console.log('save success'); |
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uni.showToast({ |
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title: '海报已保存相册', |
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icon: 'success', |
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duration: 2000 |
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}); |
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} |
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}); |
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} |
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}); |
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//#endif |
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}, |
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async OnCanvas() { |
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this.$queue.showLoading('海报生成中...'); |
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_this.ctx = uni.createCanvasContext(_this.CanvasID, this); |
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const C_W = uni.upx2px(_this.Width), //canvas宽度 |
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C_P = uni.upx2px(30), //canvas Paddng 间距 |
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C_Q = uni.upx2px(150); //二维码或太阳码宽高 |
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let _strlineW = 0; //文本宽度 |
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let _imgInfo = await _this.getImageInfo({ |
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imgSrc: _this.imgSrc |
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}); //广告图 |
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let _QrCode = await _this.getImageInfo({ |
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imgSrc: _this.QrSrc |
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}); //二维码或太阳码 |
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let r = [_imgInfo.width, _imgInfo.height]; |
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let q = [_QrCode.width, _QrCode.height]; |
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let imgW = C_W - C_P * 2; |
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if (r[0] != imgW) { |
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r[1] = Math.floor((imgW / r[0]) * r[1]); |
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r[0] = imgW; |
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} |
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if (q[0] != C_Q) { |
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q[1] = Math.floor((C_Q / q[0]) * q[1]); |
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q[0] = C_Q; |
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} |
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_this.canvasW = C_W; |
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_this.canvasH = r[1] + q[1] + 128; |
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_this.ctx.setFillStyle(_this.CanvasBg); //canvas背景颜色 |
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_this.ctx.fillRect(0, 0, C_W, _this.canvasH); //canvas画布大小 |
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//添加图片展示 |
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_this.ctx.drawImage(_imgInfo.path, C_P, C_P, r[0], r[1]); |
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//添加图片展示 end |
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//设置文本 |
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//#ifdef H5 |
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_this.ctx.setFontSize(uni.upx2px(32)); //设置标题字体大小 |
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//#endif |
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//#ifndef H5 |
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_this.ctx.setFontSize(uni.upx2px(36)); //设置标题字体大小 |
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//#endif |
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_this.ctx.setFillStyle(_this.TitleColor); //设置标题文本颜色 |
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let _strLastIndex = 0; //每次开始截取的字符串的索引 |
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let _strHeight = r[1] + C_P * 2 + 10; //绘制字体距离canvas顶部的初始高度 |
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let _num = 1; |
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for (let i = 0; i < _this.Title.length; i++) { |
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_strlineW += _this.ctx.measureText(_this.Title[i]).width; |
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if (_strlineW > r[0]) { |
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if (_num == 2 && _this.LineType) { |
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//文字换行数量大于二进行省略号处理 |
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_this.ctx.fillText(_this.Title.substring(_strLastIndex, i - 8) + '...', C_P, _strHeight); |
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_strlineW = 0; |
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_strLastIndex = i; |
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_num++; |
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break; |
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} else { |
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_this.ctx.fillText(_this.Title.substring(_strLastIndex, i), C_P, _strHeight); |
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_strlineW = 0; |
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_strHeight += 20; |
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_strLastIndex = i; |
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_num++; |
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} |
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} else if (i == _this.Title.length - 1) { |
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_this.ctx.fillText(_this.Title.substring(_strLastIndex, i + 1), C_P, _strHeight); |
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_strlineW = 0; |
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} |
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} |
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//设置文本 end |
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//设置价格 |
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_strlineW = C_P; |
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_strHeight += uni.upx2px(60); |
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if (_num == 1) { |
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_strHeight += 20; //单行标题时占位符 |
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} |
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if (_this.PriceTxt != '') { //判断是否有销售价格 |
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_this.ctx.setFillStyle(_this.PriceColor); |
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_this.ctx.setFontSize(uni.upx2px(38)); |
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_this.ctx.fillText(_this.PriceTxt, _strlineW, _strHeight); //商品价格 |
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_strlineW += _this.ctx.measureText(_this.PriceTxt).width + uni.upx2px(10); |
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} |
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if (_this.PriceTxt != '' && _this.OriginalTxt != '') { //判断是否有销售价格且原价 |
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_this.ctx.setFillStyle(_this.OriginalColor); |
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_this.ctx.setFontSize(uni.upx2px(24)); |
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_this.ctx.fillText(_this.OriginalTxt, _strlineW, _strHeight); //商品原价 |
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} |
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_this.ctx.strokeStyle = _this.OriginalColor; |
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_this.ctx.moveTo(_strlineW, _strHeight - uni.upx2px(10)); //起点 |
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_this.ctx.lineTo(_strlineW + _this.ctx.measureText(_this.OriginalTxt).width, _strHeight - uni.upx2px(10)); //终点 |
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_this.ctx.stroke(); |
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//设置价格 end |
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//添加二维码 |
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_strHeight += uni.upx2px(20); |
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_this.ctx.drawImage(_QrCode.path, r[0] - q[0] + C_P, _strHeight, q[0], q[1]); |
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//添加二维码 end |
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//添加推荐人与描述 |
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_this.ctx.setFillStyle(_this.TitleColor); |
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_this.ctx.setFontSize(uni.upx2px(30)); |
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_this.ctx.fillText(_this.Referrer, C_P, _strHeight + q[1] / 2); |
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_this.ctx.setFillStyle(_this.OriginalColor); |
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_this.ctx.setFontSize(uni.upx2px(24)); |
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_this.ctx.fillText(_this.ViewDetails, C_P, _strHeight + q[1] / 2 + 20); |
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//添加推荐人与描述 end |
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//延迟后渲染至canvas上 |
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setTimeout(function() { |
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_this.ctx.draw(true, (ret) => { |
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_this.getNewImage(); |
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}); |
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}, 600); |
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// setTimeout(function () { |
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// uni.hideLoading(); |
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// }, 3000); |
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}, |
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async getImageInfo({ |
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imgSrc |
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}) { |
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return new Promise((resolve, errs) => { |
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uni.getImageInfo({ |
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src: imgSrc, |
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success: function(image) { |
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resolve(image); |
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}, |
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fail(err) { |
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errs(err); |
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uni.hideLoading(); |
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_this.$queue.showToast("海报生成失败") |
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} |
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}); |
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}); |
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}, |
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getNewImage() { |
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uni.canvasToTempFilePath({ |
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canvasId: _this.CanvasID, |
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quality: 1, |
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complete: (res) => { |
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_this.tempFilePath = res.tempFilePath; |
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_this.$emit('success', res); |
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_this.$queue.showToast("长按图片保存海报") |
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// uni.hideLoading(); |
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} |
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}, this); |
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} |
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}, |
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mounted() { |
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_this = this; |
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this.OnCanvas(); |
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} |
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}; |
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</script> |
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<style></style>
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