381 lines
9.1 KiB
Vue
381 lines
9.1 KiB
Vue
<!--
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@name: GoodsPoster
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@author: kahu4
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@date: 2024-01-17 17:38
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@description：商品海报
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@update: 2024-01-17 17:38
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-->
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<script setup>
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import { getCurrentInstance, nextTick, ref } from "vue";
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import { useImage } from "@/hooks/useImage";
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import { useMainStore } from "@/store/store";
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import { useShare } from "@/hooks/useShare";
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import { generateMiniProgramQrCode } from "@/api/global";
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// =================================== hooks ============================================
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const mainStore = useMainStore();
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const {getImageInfo, base64ToUrl, saveImageToPhotosAlbum} = useImage();
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const {shareInfo, goodsDetailShare} = useShare();
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const show = ref(false)
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const goods = ref(undefined)
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const miniProgramQrCode = ref('')
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/**
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* 打开分享弹窗
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* @param good 商品信息
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*/
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async function open(good) {
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goods.value = good
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show.value = true
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// 生成小程序二维码
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uni.showLoading({title: '获取数据中...'})
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goodsDetailShare(good)
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miniProgramQrCode.value = await generateMiniProgramQrCode({path: `pages/share/index`, name: shareInfo.value.query});
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await nextTick(() => {
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draw()
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})
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}
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/**
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* 关闭分享弹窗
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*/
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function close() {
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goods.value = posterImagePath.value = undefined
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show.value = false
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}
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defineExpose({open, close})
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// ======================= 画布 =========================================
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const posterImagePath = ref(null) // 海报图片路径
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const _this = getCurrentInstance() // 当前组件实例
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const canvasRef = ref() // 画布ref
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const ctx = uni.createCanvasContext('goods-canvas', _this) // 画笔对象
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/**
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* 绘制画布
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*/
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function draw() {
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uni.showLoading({title: '海报生成中'})
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const selectorQuery = uni.createSelectorQuery().in(_this);
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selectorQuery.select('#goods-canvas').boundingClientRect().exec(async res => {
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try {
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const {width, height} = res[0] //px
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// 绘制背景
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drawRoundedRectangle({
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width,
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height,
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round: 10
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})
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// 绘制header
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await drawUserInfo()
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// 绘制商品信息
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await drawGoodsInfo(width)
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// 绘制小程序分享信息
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await drawShareInfo(width)
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ctx.draw(false, () => {
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generatePoster()
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});
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} catch (e) {
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uni.hideLoading()
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console.dir(e)
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throw new Error(e)
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}
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})
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}
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/**
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* 绘制用户信息
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* @returns {Promise<void>}
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*/
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async function drawUserInfo() {
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// 用户头像
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await drawImage({x: 15, y: 15, width: 32, height: 32, src: mainStore.user.avatar})
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ctx.save()
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ctx.font = 'normal 16px sans-serif';
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ctx.fillStyle = '#000000'
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ctx.translate(68, 32)
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// y 要设置成字体大小的一半
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ctx.fillText(mainStore.user.nickname, 0, 8)
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ctx.restore()
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}
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/**
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* 绘制商品信息
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* @returns {Promise<void>}
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*/
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async function drawGoodsInfo(width) {
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// 图片
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const imageHeight = width - 24 * 2 // 24是UI稿单边边距
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const src = goods.value.image
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await drawImage({x: 24, y: 72, width: imageHeight, height: imageHeight, src})
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// 商品名称
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const goodsName = goods.value.storeName
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// 商品价格
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const goodsPrice = goods.value.price
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// 商品划线价格
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const goodsOldPrice = goods.value.otPrice
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const sliceName = ctx.measureText(goodsName) >= width / 1.5 ? goodsName : goodsName.slice(0, 17) + '...'
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/** 商品名称 **/
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ctx.save()
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ctx.translate(24, width + 58)
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ctx.font = 'normal bold 16px sans-serif';
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ctx.fillStyle = '#000000'
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ctx.fillText(sliceName, 0, 0)
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ctx.restore()
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/** 商品原始价格 **/
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ctx.save()
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ctx.translate(24, width + 58 + 36)
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ctx.font = 'normal bold 24px sans-serif';
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ctx.fillStyle = '#EE6D46'
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ctx.fillText(`￥${ goodsPrice }`, 0, 0)
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// 删除线价格
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const goodsPriceTextMetrics = ctx.measureText(`￥${ goodsPrice }`); // 商品价格宽度
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ctx.font = 'normal normal 16px sans-serif';
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ctx.fillStyle = '#999999'
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ctx.fillText(`￥${ goodsOldPrice }`, goodsPriceTextMetrics.width + 10, 0)
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const goodsOldPriceTextMetrics = ctx.measureText(`￥${ goodsOldPrice }`); // 商品删除价格宽度
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ctx.fillRect(goodsPriceTextMetrics.width + 10, -8, goodsOldPriceTextMetrics.width + 5, 1.5)
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ctx.restore()
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/** 分割线 */
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ctx.save()
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ctx.beginPath()
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ctx.strokeStyle = '#F0F0F0'
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ctx.translate(24, width + 58 + 36 + 15)
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ctx.moveTo(0, 0)
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ctx.lineWidth = 1
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ctx.lineTo(imageHeight, 0)
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ctx.stroke()
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ctx.closePath()
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ctx.restore()
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}
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/**
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* 绘制分享信息
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* @returns {Promise<void>}
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*/
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async function drawShareInfo(width) {
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ctx.save();
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ctx.translate(24, width + 58 + 36 + 15 + 25)
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const text = "长按识别图中二维码"
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const subText = "来自「Yshop商城」小程序"
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ctx.font = 'normal bold 16px sans-serif';
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ctx.fillStyle = '#000000'
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// 主要字体
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ctx.fillText(text, 0, 0)
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ctx.font = 'normal normal 14px sans-serif';
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ctx.fillStyle = '#8C8C8C'
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ctx.fillText(subText, 0, 25)
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const path = await base64ToUrl(miniProgramQrCode.value);
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/** 二维码 **/
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await drawImage({
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x: width - (24 * 2) - 50,
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y: -18,
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width: 50,
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height: 50,
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src: path
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})
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ctx.restore();
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}
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/**
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* 绘制圆角矩形
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* @param options
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*/
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function drawRoundedRectangle(options = {}) {
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ctx.save()
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const defaultOptions = {
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x: 0,
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y: 0,
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width: 0,
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height: 0,
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round: 0,
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stroke: false,
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strokeStyle: '#ffffff',
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fillStyle: '#ffffff',
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}
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options = {...defaultOptions, ...options}
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const {x, y, width, height, round, stroke, strokeStyle, fillStyle} = options
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ctx.beginPath();
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ctx.moveTo(x + round, y);
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ctx.arcTo(x + width, y, x + width, y + round, round);
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ctx.lineTo(x + width, y + height - round);
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ctx.arcTo(x + width, y + height, x + width - round, y + height, round);
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ctx.lineTo(x + round, y + height);
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ctx.arcTo(x, y + height, x, y + height - round, round);
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ctx.lineTo(x, y + round);
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ctx.arcTo(x, y, x + round, y, round);
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ctx.closePath();
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ctx.fillStyle = fillStyle;
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ctx.strokeStyle = strokeStyle;
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ctx.fill();
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stroke && ctx.stroke()
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ctx.restore()
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}
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/**
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* 绘制图片
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* @param options
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* @returns {Promise<void>}
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*/
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async function drawImage(options = {}) {
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const defaultOptions = {
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x: 0,
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y: 0,
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width: 0,
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height: 0,
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src: ''
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}
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options = {...defaultOptions, ...options}
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// 获取图片信息
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const {path} = await getImageInfo(options.src);
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ctx.drawImage(path, options.x, options.y, options.width, options.height)
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}
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/**
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* 生成画布
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* @returns {Promise<void>}
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*/
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async function generatePoster() {
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console.log("开始生成画布")
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// #ifndef MP-WEIXIN
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uni.canvasToTempFilePath({
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canvasId: 'goods-canvas',
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success: async (res) => {
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// 在H5平台下，tempFilePath 为 base64
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// #ifdef H5
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posterImagePath.value = await base64ToUrl(res.tempFilePath);
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// #endif
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// #ifndef H5
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posterImagePath.value = res.tempFilePath;
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console.log(posterImagePath.value, res)
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// #endif
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uni.hideLoading()
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},
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fail: (err) => {
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console.log(err)
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uni.hideLoading()
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}
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})
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// #endif
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// #ifdef MP-WEIXIN
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wx.canvasToTempFilePath({
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canvasId: 'goods-canvas',
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canvas:canvasRef.value,//这里是重点，获取实例的时候保存为全局变量就行了
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success: async (res) => {
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posterImagePath.value = res.tempFilePath;
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uni.hideLoading()
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},
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fail: (err) => {
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console.log(err)
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uni.hideLoading()
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}
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},_this)
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// #endif
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}
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/**
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* 保存到相册
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* @returns {Promise<void>}
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*/
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async function save() {
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uni.showLoading({title: '保存中'})
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try {
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await saveImageToPhotosAlbum(posterImagePath.value, goods.value.storeName)
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close()
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} finally {
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uni.hideLoading()
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}
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}
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</script>
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<template>
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<u-overlay
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@touchmove="(e)=>{e.preventDefault();}"
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:show="show"
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@click="close">
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<view
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class="poster"
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v-if="goods && posterImagePath">
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<!-- 海报 -->
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<view
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class="poster-image"
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@click.stop>
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<image :src="posterImagePath" />
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</view>
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<!-- 按钮组合 -->
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<view class="button-group">
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<view
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class="button line-button"
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@click.stop="close">
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取消
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</view>
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<view
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class="button animation-button"
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@click.stop="save">
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保存
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</view>
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</view>
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</view>
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<canvas
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canvas-id="goods-canvas"
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ref="canvasRef"
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style="width:654rpx;height: 1032rpx;margin: 20rpx auto;position: absolute;z-index:999;top: -999px;"
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id="goods-canvas" />
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</u-overlay>
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</template>
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<style
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scoped
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lang="scss">
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.poster {
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width: 100%;
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height: 100%;
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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.poster-image {
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width: 90%;
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aspect-ratio: 327 / 516;
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image {
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width: 100%;
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height: 100%;
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}
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}
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.button-group {
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width: 90%;
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margin-top: 40rpx;
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@include useFlex(center, center, row, nowrap, 20rpx);
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.button {
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flex-grow: 1;
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@include useFlex(center, center);
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height: 80rpx;
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background: $primary-color;
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color: $white-color;
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border-radius: 10rpx;
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box-sizing: border-box;
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}
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.line-button {
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border: 4rpx solid $white-color;
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background: transparent;
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}
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}
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}
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</style>
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