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250 lines
6.0 KiB
250 lines
6.0 KiB
<template>
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<view class="page__view">
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<!-- 导航栏 -->
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<navbar leftClick @leftClick="$utils.navigateBack" bgColor="#4883F9" color="#FFFFFF" />
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<view style="width: 750rpx; height: 1184rpx; overflow: hidden;">
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<canvas id="myCanvas" canvas-id="firstCanvas1" type="2d" style="width: 100%; height: 100%;"></canvas>
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</view>
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<view class="flex bottom">
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<view class="flex">
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<button class="btn" @click="saveImg">保存到手机</button>
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</view>
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</view>
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</view>
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</template>
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<script>
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export default {
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data() {
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return {
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wxCodeImage: '',
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baseUrl: 'https://image.hhlm1688.com/',
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canvas: {},
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details: {},
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}
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},
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async onLoad({ thesisId }) {
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await this.getData(thesisId)
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await this.fetchQrCode()
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this.draw()
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},
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methods: {
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async getData(thesisId) {
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try {
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this.details = await this.$fetch('queryThesisById', { thesisId })
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} catch (err) {
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}
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},
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async fetchQrCode() {
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try {
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// todo: check api
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this.wxCodeImage = (await this.$fetch('getInviteCode'))?.url
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} catch (err) {
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}
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},
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drawTextWithManualLineBreaks(ctx, text, x, y, maxWidth, lineHeight) {
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let rows = 0
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let size = 0
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let lines = text.split('\n'); // 支持手动输入的换行符
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for (let lIdx = 0; lIdx < lines.length; lIdx++) {
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let line = lines[lIdx]
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let row = ''
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for (let wIdx = 0; wIdx < line.length; wIdx++) {
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let word = line[wIdx]
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let metrics = ctx.measureText(row + word);
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if (metrics.width > maxWidth) {
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rows++
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size += row.length
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console.log('--rows', rows, '--size', size)
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if (rows === 4 && size < text.length) {
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row = row.slice(0, -2) + '......'
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}
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ctx.fillText(row, x, y);
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row = ''
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y += lineHeight
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if (rows === 4) {
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break
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}
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} else {
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row += word
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}
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}
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if (rows === 4) {
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break
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}
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if (row) {
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rows++
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size += row.length
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console.log('--rows', rows, '--size', size)
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if (rows === 4 && size < text.length) {
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row = row.slice(0, -2) + '......'
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}
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ctx.fillText(row, x, y);
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y += lineHeight
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if (rows === 4) {
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break
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}
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}
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}
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},
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draw() {
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uni.showLoading({
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title: "拼命绘画中..."
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})
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wx.createSelectorQuery()
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.select('#myCanvas') // 绘制的canvas的id
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.fields({
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node: true,
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size: true
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})
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.exec(async (res) => {
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const canvas = res[0].node
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// 渲染上下文
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const ctx = canvas.getContext('2d')
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// Canvas 画布的实际绘制宽高
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const width = res[0].width
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const height = res[0].height
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// 初始化画布大小
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const dpr = wx.getWindowInfo().pixelRatio
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//根据dpr调整
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// dpr 2 4
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// 3 6
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console.log("--dpr", dpr)
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canvas.width = width * dpr
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canvas.height = height * dpr
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let Ratio = canvas.width / 750
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this.canvas = canvas
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ctx.scale(dpr, dpr)
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ctx.clearRect(0, 0, width, height)
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ctx.fillStyle = '#fff'
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ctx.fillRect(0, 0, canvas.width, canvas.height)
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ctx.fillStyle = '#999999';
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const fontSize = 28 * Ratio / dpr
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ctx.font = `${fontSize}px PingFangSC-regular`;
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const descX = 37 * Ratio / dpr
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const descY = 751 * Ratio / dpr
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const maxWidth = 677 * Ratio / dpr
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const lineHeight = 45 * Ratio / dpr
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this.drawTextWithManualLineBreaks(ctx, this.details.paperDesc, descX, descY, maxWidth, lineHeight)
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// 海报图片
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const paperImage = canvas.createImage()
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paperImage.src = this.details.paperImage
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paperImage.onload = () => {
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const x = 37 * Ratio / dpr
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const y = 21 * Ratio / dpr
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const w = 677 * Ratio / dpr
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const h = 687 * Ratio / dpr
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ctx.drawImage(paperImage, x, y, w, h)
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//二维码图片
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const coderImage = canvas.createImage()
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coderImage.src = this.wxCodeImage
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coderImage.onload = () => {
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const x = 539 * Ratio / dpr
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const y = 987 * Ratio / dpr
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const size = 162 * Ratio / dpr
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ctx.drawImage(coderImage, x, y, size, size)
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uni.hideLoading()
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}
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}
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})
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},
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saveImg() {
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this.$authorize('scope.writePhotosAlbum').then((res) => {
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this.imgApi()
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})
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},
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imgApi() {
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wx.canvasToTempFilePath({
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x: 0,
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y: 0,
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width: this.canvas.width,
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height: this.canvas.height,
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canvas: this.canvas,
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success: (res) => {
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let tempFilePath = res.tempFilePath;
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this.saveImgToPhone(tempFilePath)
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},
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fail: (err) => {
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console.log('--canvasToTempFilePath--fail', err)
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}
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}, this);
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},
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saveImgToPhone(image) {
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/* 获取图片的信息 */
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uni.getImageInfo({
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src: image,
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success: function(image) {
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/* 保存图片到手机相册 */
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uni.saveImageToPhotosAlbum({
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filePath: image.path,
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success: function() {
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uni.showModal({
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title: '保存成功',
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content: '图片已成功保存到相册',
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showCancel: false
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});
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},
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complete(res) {
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console.log(res);
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}
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});
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}
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});
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}
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},
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}
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</script>
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<style scoped lang="scss">
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.page__view {
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background: $uni-bg-color-grey;
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}
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.bottom {
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position: fixed;
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left: 0;
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bottom: 0;
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width: 100vw;
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height: 154rpx;
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padding-bottom: env(safe-area-inset-bottom);
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background: #FFFFFF;
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.btn {
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padding: 20rpx 77rpx;
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font-size: 28rpx;
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color: #FFFFFF;
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background: #4883F9;
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border-radius: 14rpx;
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}
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}
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</style>
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