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185 lines
3.9 KiB
185 lines
3.9 KiB
<template>
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<view class="page">
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<view class="flex-colt content">
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<view style="width: 750rpx; height: 1125rpx;">
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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-rowc btns">
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<button plain class="flex-rowc btn btn-save" @click="saveImg" >保存海报</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 setup>
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import { ref, reactive, computed } from 'vue'
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import { onLoad } from '@dcloudio/uni-app'
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import { useStore } from "vuex"
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import authorize from '@/utils/authorize.js'
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const store = useStore();
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const configList = computed(() => {
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return store.getters.configList
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})
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const url = ref()
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const canvasData = reactive({
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width: null,
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height: null,
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canvas: null
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})
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const savePath = ref()
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const 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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canvasData.canvas = _canvas
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ctx.scale(dpr, dpr)
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ctx.clearRect(0, 0, width, height)
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canvasData.width = _canvas.width
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canvasData.height = _canvas.height
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//背景图片
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const bgImage = _canvas.createImage()
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bgImage.src = configList.value.background_poster.paramValueImage
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bgImage.onload = () => {
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ctx.drawImage(bgImage, 0, 0, width, height)
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//二维码图片
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const coderImage = _canvas.createImage()
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coderImage.src = url.value
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coderImage.onload = () => {
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const x = 270 * Ratio / dpr
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const y = 672 * Ratio / dpr
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const size = 197 * Ratio / dpr
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ctx.drawImage(coderImage, x, y, size, size)
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uni.hideLoading()
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setTimeout(() => {
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wx.canvasToTempFilePath({
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x: 0,
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y: 0,
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width: _canvas.width,
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height: _canvas.height,
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canvas: _canvas,
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success: (res) => {
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let tempFilePath = res.tempFilePath;
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savePath.value = tempFilePath
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console.log('--savePath', savePath.value)
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// 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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});
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})
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}
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}
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})
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}
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const saveImg = () => {
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authorize('scope.writePhotosAlbum').then((res) => {
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saveImgToPhone(savePath.value)
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})
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}
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const 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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onLoad((options) => {
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// url.value = options.url
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// 暂时用配置项
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url.value = configList.value.share_qr_url.paramValueImage
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draw()
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})
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</script>
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<style scoped lang="scss">
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.page {
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background-color: #FFFFFF;
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width: 100vw;
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min-height: 100vh;
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.content {
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padding-top: 19rpx;
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}
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.btns {
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width: 100%;
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margin-top: 7rpx;
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}
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.btn {
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display: inline-block;
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border: none;
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width: 594rpx;
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height: auto;
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padding: 27rpx 0;
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border-radius: 94rpx;
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background-color: #FFBF60;
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color: #FFFFFF;
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font-size: 30rpx;
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line-height: 40rpx;
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}
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}
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</style>
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