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455 lines
13 KiB
455 lines
13 KiB
<template>
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<uv-popup
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ref="popup"
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:overlayOpacity="0.6"
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mode="center"
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bgColor="none"
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:zIndex="1000000"
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@change="onPopupChange"
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>
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<view class="popup__view">
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<view class="canvas" style="width: 566rpx; height: 1060rpx; 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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<button class="btn" @click="saveImg">
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<view class="content">保存到相册</view>
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</button>
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</view>
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</uv-popup>
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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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retry: 10,
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}
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},
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async onLoad() {
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},
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methods: {
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open() {
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this.retry = 10
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this.$refs.popup.open();
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},
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close() {
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this.$refs.popup.close();
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},
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async fetchQrCode(path) {
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// todo: delete
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this.wxCodeImage = 'https://uploadfile.bizhizu.cn/up/e3/64/e0/e364e0f7f6af11f11abdafc22d17b15c.jpg'
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return
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try {
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this.wxCodeImage = (await this.$fetch('getInviteCode', { path }))?.url
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} catch (err) {
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}
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},
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// 生成有圆角的矩形
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drawBg(ctx, x, y, width, height, radius) {
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ctx.beginPath();
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ctx.arc(x + radius, y + radius, radius, Math.PI, Math.PI * 3 / 2);
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ctx.lineTo(width - radius + x, y);
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ctx.arc(width - radius + x, radius + y, radius, Math.PI * 3 / 2, Math.PI * 2);
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ctx.lineTo(width + x, height + y - radius);
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ctx.arc(width - radius + x, height - radius + y, radius, 0, Math.PI * 1 / 2);
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ctx.lineTo(radius + x, height + y);
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ctx.arc(radius + x, height - radius + y, radius, Math.PI * 1 / 2, Math.PI);
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ctx.closePath();
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ctx.fillStyle = '#fff'
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ctx.fill()
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},
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drawCoverImg(canvas, ctx, x, y, width, height, radius, lineWidth) {
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return new Promise(resolve => {
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// 海报图片
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const paperImage = canvas.createImage()
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console.log('paperImage', paperImage)
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// todo: fetch
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paperImage.src = 'https://i1.hdslb.com/bfs/archive/c0101b4ce06e6bdda803728408e79c8f8b8d0725.jpg'
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paperImage.onload = () => {
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console.log('paperImage onload')
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ctx.beginPath();
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ctx.arc(x + radius, y + radius, radius, Math.PI, Math.PI * 3 / 2);
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ctx.lineTo(width - radius + x, y);
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ctx.arc(width - radius + x, radius + y, radius, Math.PI * 3 / 2, Math.PI * 2);
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ctx.lineTo(width + x, height + y);
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ctx.lineTo(x, height + y);
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ctx.closePath();
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ctx.lineWidth = lineWidth;
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ctx.strokeStyle = '#F8F8F8';
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ctx.stroke();
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ctx.clip();
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ctx.drawImage(paperImage, x, y, width, height)
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resolve()
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}
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})
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},
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drawContentBg(ctx, x, y, width, height, radius) {
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ctx.beginPath();
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// ctx.arc(x + radius, y + radius, radius, Math.PI, Math.PI * 3 / 2);
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ctx.moveTo(x, y);
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ctx.lineTo(width + x, y);
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ctx.lineTo(width + x, height + y - radius);
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ctx.arc(width - radius + x, height - radius + y, radius, 0, Math.PI * 1 / 2);
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ctx.lineTo(radius + x, height + y);
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ctx.arc(radius + x, height - radius + y, radius, Math.PI * 1 / 2, Math.PI);
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ctx.closePath();
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let gradient = ctx.createLinearGradient(x, y, x, y + height);
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gradient.addColorStop('0', '#DAF3FF');
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gradient.addColorStop('0.2', '#FBFEFF');
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gradient.addColorStop('1.0', '#FBFEFF');
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ctx.fillStyle = gradient
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ctx.fill()
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},
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drawAvatar(canvas, ctx, x, y, r) {
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console.log('drawAvatar', 'x', x, 'y', y, 'r', r)
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return new Promise(resolve => {
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// 头像图片
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const avatarImage = canvas.createImage()
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// todo: fetch
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avatarImage.src = 'https://i1.hdslb.com/bfs/archive/c0101b4ce06e6bdda803728408e79c8f8b8d0725.jpg'
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avatarImage.onload = () => {
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console.log('avatarImage onload')
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ctx.beginPath();
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console.log('arc', 'x', x + r, 'y', y + r, 'r', r)
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ctx.arc(x + r, y + r, r, 0, 2 * Math.PI);
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ctx.clip();
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const size = r*2
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console.log('size', size)
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ctx.drawImage(avatarImage, x, y, size, size)
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resolve()
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}
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})
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},
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drawMultilineText(ctx, text, x, y, maxWidth, lineHeight) {
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console.log('drawMultilineText', 'x', x, 'y', y)
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let line = '';
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for (let n = 0; n < text.length; n++) {
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const testLine = line + text[n];
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const metrics = ctx.measureText(testLine);
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const testWidth = metrics.width;
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if (testWidth > maxWidth && n > 0) {
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ctx.fillText(line, x, y);
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console.log(n, 'line', line, 'x', x, 'y', y)
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line = text[n];
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y += lineHeight;
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} else {
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line = testLine;
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}
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}
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console.log('line', line, 'x', x, 'y', y)
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ctx.fillText(line, x, y);
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},
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drawQrCodeImg(canvas, ctx, x, y, size) {
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return new Promise(resolve => {
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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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console.log('coderImage onload')
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ctx.drawImage(coderImage, x, y, size, size)
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resolve()
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}
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})
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},
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draw() {
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wx.createSelectorQuery().in(this)
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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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console.log('res', res)
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if (!res?.[0]?.node) {
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if (!this.retry) {
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console.log('retry fail')
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return
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}
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console.log('retry')
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this.retry -= 1
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setTimeout(() => {
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this.draw()
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}, 200)
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return
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}
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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 / 566
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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 = 'transparent'
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ctx.fillRect(0, 0, canvas.width, canvas.height)
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ctx.save()
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let radius = 48 * Ratio / dpr
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let w = 566 * Ratio / dpr
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let h = 1060 * Ratio / dpr
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this.drawBg(ctx, 0, 0, w, h, radius)
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ctx.restore();
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ctx.save()
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let lineWidth = 2 * Ratio / dpr
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let x = lineWidth
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let y = lineWidth
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w = 566 * Ratio / dpr - lineWidth * 2
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h = 400 * Ratio / dpr - lineWidth * 2
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await this.drawCoverImg(canvas, ctx, x, y, w, h, radius, lineWidth)
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ctx.restore();
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ctx.save()
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x = lineWidth
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y = 400 * Ratio / dpr + lineWidth
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h = 660 * Ratio / dpr - lineWidth * 2
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this.drawContentBg(ctx, x, y, w, h, radius, lineWidth)
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ctx.restore();
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ctx.save()
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radius = Math.floor(27 * Ratio / dpr)
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x = Math.floor(40 * Ratio / dpr)
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y = Math.floor(440 * Ratio / dpr)
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await this.drawAvatar(canvas, ctx, x, y, radius)
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ctx.restore();
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ctx.save()
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let text = '战斗世界'
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let maxWidth = 220 * Ratio / dpr
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let lineHeight = 17 * Ratio / dpr
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x = 100 * Ratio / dpr
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y = 474 * Ratio / dpr
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ctx.font = "normal normal normal 11px normal";
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ctx.fillStyle = "#7D7D7D";
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this.drawMultilineText(ctx, text, x, y, maxWidth, lineHeight)
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ctx.restore();
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ctx.save()
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maxWidth = 540 * Ratio / dpr
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lineHeight = 60 * Ratio / dpr
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ctx.font = "normal normal 600 17px normal";
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ctx.fillStyle = "#181818";
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text = '邀请您'
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x = 40 * Ratio / dpr
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y = 564 * Ratio / dpr
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this.drawMultilineText(ctx, text, x, y, maxWidth, lineHeight)
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y += lineHeight
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text = '探索新世界，开启研学之旅！'
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this.drawMultilineText(ctx, text, x, y, maxWidth, lineHeight)
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ctx.restore();
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ctx.save()
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text = '是否渴望一场充满知识与乐趣的冒险？现在，我们诚挚邀请你加入我们的研学小程序，开启一场别开生面的学习之旅！'
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maxWidth = 486 * Ratio / dpr
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lineHeight = 30 * Ratio / dpr
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ctx.font = "normal normal normal 10px normal";
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ctx.fillStyle = "#7D7D7D";
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x = 40 * Ratio / dpr
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y = 690 * Ratio / dpr
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this.drawMultilineText(ctx, text, x, y, maxWidth, lineHeight)
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ctx.restore();
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ctx.save()
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// 设置虚线样式
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ctx.setLineDash([4, 4]); // 第一个参数是实线长度, 第二个参数是间隔长度
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ctx.lineDashOffset = 2; // 设置虚线的起始偏移量
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ctx.lineWidth = lineWidth;
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ctx.strokeStyle = '#DADADA';
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// 开始绘制
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ctx.beginPath();
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x = 40 * Ratio / dpr
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y = 778 * Ratio / dpr
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ctx.moveTo(x, y);
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x += 486 * Ratio / dpr
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ctx.lineTo(x, y);
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ctx.stroke();
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ctx.restore();
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ctx.save()
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maxWidth = 250 * Ratio / dpr
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lineHeight = 44 * Ratio / dpr
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ctx.font = "normal normal 600 13px normal";
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ctx.fillStyle = "#181818";
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text = '立即加入我们，'
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x = 40 * Ratio / dpr
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y = 879 * Ratio / dpr
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this.drawMultilineText(ctx, text, x, y, maxWidth, lineHeight)
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text = '开启你的研学之旅！'
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y += lineHeight
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this.drawMultilineText(ctx, text, x, y, maxWidth, lineHeight)
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ctx.restore();
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ctx.save()
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x = 316 * Ratio / dpr
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y = 810 * Ratio / dpr
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let size = 210 * Ratio / dpr
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await this.drawQrCodeImg(canvas, ctx, x, y, size)
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uni.hideLoading()
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return
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// 海报图片
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const paperImage = canvas.createImage()
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console.log('paperImage', paperImage)
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// todo: fetch
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paperImage.src = 'https://i1.hdslb.com/bfs/archive/c0101b4ce06e6bdda803728408e79c8f8b8d0725.jpg'
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paperImage.onload = () => {
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console.log('paperImage onload')
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const w = 566 * Ratio / dpr
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const h = 400 * Ratio / dpr
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ctx.drawImage(paperImage, 0, 0, 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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console.log('coderImage onload')
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const x = 316 * Ratio / dpr
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const y = 910 * Ratio / dpr
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const size = 210 * 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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async init() {
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uni.showLoading({
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title: '加载中...'
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});
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await this.fetchQrCode()
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uni.hideLoading();
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uni.showLoading({
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title: "拼命绘画中..."
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})
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this.draw()
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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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uni.showLoading({
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title: '保存中...'
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});
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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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uni.hideLoading();
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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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uni.hideLoading();
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}
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});
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}
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});
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},
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onPopupChange(e) {
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if (!e.show) {
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return
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}
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this.init()
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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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.canvas {
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border-radius: 48rpx;
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}
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.btn {
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margin-top: 32rpx;
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width: 100%;
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padding: 22rpx 0;
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box-sizing: border-box;
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font-family: PingFang SC;
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font-weight: 500;
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font-size: 36rpx;
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line-height: 1;
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color: #FFFFFF;
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background: linear-gradient(to right, #21FEEC, #019AF9);
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border: 2rpx solid #00A9FF;
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border-radius: 41rpx;
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}
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</style>
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