301 lines
9.1 KiB
JavaScript
301 lines
9.1 KiB
JavaScript
Page({
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/**
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* 页面的初始数据
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*/
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data: {
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shareSee: false, // 分享弹出
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inviteCode: '', // 二维码
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currentBgIndex: 0, // 轮播图数量
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styleShow: false, // 是否展示图片查看并选择
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styleType:'', // 二维码 切换 还是背景图
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qrcodes:[], // 城市二维码数组
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currentCodeIndex:0,//
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//海报
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loading : true,
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codeType : 'city',
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posterDatas : {}, // 定位
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posterDatasLists: [],// 海报数据返回
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},
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/**
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* 生命周期函数--监听页面加载
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*/
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onLoad() {
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wx.showLoading({
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title: '请求中...',
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})
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},
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// 切换城市
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changeCity(){
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this.setData({
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styleType:'qcode',
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styleShow:true
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})
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},
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// 轮播图滚动
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swiperChange(e) {
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let index = e.detail.current
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if(this.data.codeType == 'city'){
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wx.setNavigationBarTitle({
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title: `城市体验官(${this.data.posterDatasLists[index].name})`,
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})
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this.setData({
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inviteCode:this.data.posterDatasLists[index].code
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})
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}
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this.setData({
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posterDatas: this.data.posterDatasLists[index],
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currentBgIndex: index
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})
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this.initCanvas()
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},
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// 选择上面图切换轮播
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selectBgIndex(e) {
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let index = e.currentTarget.dataset.index
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if (index != this.data.currentBgIndex) {
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this.setData({
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currentBgIndex: index
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})
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}
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},
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// 切换上面二维码图片
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selectCodeIndex(e) {
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let index = e.currentTarget.dataset.index
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let qrcodes = this.data.qrcodes
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if (index != this.data.currentCodeIndex) {
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this.setData({
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currentCodeIndex: index,
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inviteCode: qrcodes[index].code
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})
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wx.setNavigationBarTitle({
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title: `城市体验官(${qrcodes[index].name})`,
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})
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}
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},
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// 展示或者隐藏样式
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changeStyle() {
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this.setData({
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styleShow: !this.data.styleShow,
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styleType:''
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})
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},
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onShow() {
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this.ShareInfo();
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},
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//生成海报初始化
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initCanvas() {
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var that = this;
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var posterDatas = that.data.posterDatas
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const query = wx.createSelectorQuery()
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query.select('#firstCanvas').fields({
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node: true,
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size: true
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},
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function (res) {
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const canvas = res.node
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const ctx = canvas.getContext('2d')
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const dpr = wx.getSystemInfoSync().pixelRatio
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canvas.width = posterDatas.width * dpr
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canvas.height = posterDatas.height * dpr
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ctx.scale(dpr, dpr)
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posterDatas.canvas = canvas
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posterDatas.ctx = ctx
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posterDatas.dpr = dpr
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//存储
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that.setData({
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posterDatas
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})
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}).exec()
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wx.hideLoading()
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},
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/**
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* 小程序码
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*/
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ShareInfo() {
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wx.$api.recruit.posters({
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size: 200,
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path: '/pages/recruit/index'
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}).then(res2 => {
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this.setData({
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loading: false,
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qrcodes:res2.data.qrcodes,
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inviteCode: res2.data.qrcodes[0].code,
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})
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wx.setNavigationBarTitle({
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title: `城市体验官(${res2.data.qrcodes[0].name})`,
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})
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wx.getSystemInfo({
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success: (res) => {
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let windowWidth = res.windowWidth // 当前设备宽
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let windowHeight = res.windowHeight // 当前设备高
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this.setData({
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windowWidth: windowWidth,
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windowHeight: windowHeight
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})
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let lists = [] //
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let posters = res2.data.qrcodes
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posters.map(item => {
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item.position.newx = windowWidth / item.width * item.position.x.toFixed(2)
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item.position.newy = windowHeight / item.height * item.position.y.toFixed(2)
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item.position.newSize = windowWidth / item.width * item.position.size.toFixed(2)
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item.show = true, // 显示隐藏海报弹窗
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item.success = false, // 是否成功生成过海报
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item.canvas = null, // 画布的节点
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item.ctx = null, // 画布的上下文
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item.dpr = 1, // 设备的像素比
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lists.push(item)
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})
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this.setData({
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posterDatasLists: lists,
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posterDatas: lists[0]
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})
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// 数据处理完，初始化 canvas
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this.initCanvas()
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}
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})
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}).catch(err => {})
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},
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//海报生成 //画布 生成 海报[海报]
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saveImg() {
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var that = this;
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var posterDatas = that.data.posterDatas
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var canvas = posterDatas.canvas
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var ctx = posterDatas.ctx
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wx.showLoading({
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title: '海报生成中',
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mask: true
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});
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//二维码
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var codeImg = new Promise(function (resolve, reject) {
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const photo = canvas.createImage();
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photo.src = that.data.inviteCode;
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photo.onload = (e) => {
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resolve(photo);
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}
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});
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//背景素材
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var backImg = new Promise(function (resolve, reject) {
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const photo = canvas.createImage();
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photo.src = posterDatas.cover;
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photo.onload = (e) => {
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resolve(photo);
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}
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});
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Promise.all([codeImg, backImg]).then(res => {
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// 绘制背景
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ctx.drawImage(res[1], 0, 0, posterDatas.width, posterDatas.height);
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// 绘制[二维码-白色背景]
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ctx.fillStyle = "white";
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ctx.fillRect(posterDatas.position.x + 10, posterDatas.position.y + 10, posterDatas.position.size, posterDatas.position.size);
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ctx.fillRect(posterDatas.position.x + 10, posterDatas.position.y + 10, posterDatas.position.size, posterDatas.position.size);
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// 绘制[二维码]
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ctx.drawImage(res[0], posterDatas.position.x + 10, posterDatas.position.y + 10, posterDatas.position.size, posterDatas.position.size);
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// 关闭loading
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wx.hideLoading();
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//显示海报
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posterDatas.success = true;
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that.setData({
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posterDatas
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})
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this.onDownloadImges();
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}).catch(err => {})
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},
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//下载图片[海报]
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onDownloadImges() {
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wx.showLoading({
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title: '保存中',
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mask: true
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});
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var that = this;
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var posterDatas = that.data.posterDatas;
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if (!posterDatas.pic) {
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that.onCanvasBuildImges();
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return;
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}
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//可写成函数调用 这里不做解释
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wx.saveImageToPhotosAlbum({
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filePath: posterDatas.pic,
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success(res) {
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wx.hideLoading();
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wx.showToast({
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icon: 'none',
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title: '已保存到相册，快去分享吧',
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})
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that.setData({
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posterDatas,
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shareSee: !that.data.shareSee,
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styleShow: false
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})
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},
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fail() {
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wx.hideLoading();
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wx.showToast({
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icon: 'none',
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title: '进入设置页，开启“保存到相册”',
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})
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that.setData({
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posterDatas,
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styleShow: false
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})
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return;
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}
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})
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},
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//画布 转 图片[海报]
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onCanvasBuildImges() {
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var that = this;
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var posterDatas = that.data.posterDatas;
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wx.canvasToTempFilePath({
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canvas: posterDatas.canvas,
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width: posterDatas.width,
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height: posterDatas.height,
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destWidth: posterDatas.width * 3,
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destHeight: posterDatas.height * 3,
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success: res => {
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posterDatas["pic"] = res.tempFilePath;
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that.setData({
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posterDatas
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})
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that.onDownloadImges();
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},
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fail() {
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wx.hideLoading();
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wx.showToast({
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icon: 'none',
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title: 'sorry 保存失败,请稍后再试.',
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})
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return;
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}
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});
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},
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/**
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* 分享弹出
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*/
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shareTap() {
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this.setData({
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shareSee: !this.data.shareSee
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})
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}
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}) |