wxml文件
<view><text class='shareText'>生成海报分享至</text><view class='imgBox'><button open-type="share" class='zfbtn'><image src="{{wechat}}" class='img'></image></button><button class='zfbtn m_l' bindtap='formSubmit'><image src="{{quan}}" class='img'></image></button></view><!--生成海报 --><view class='imagePathBox' hidden="{{maskHidden == false}}"><image src="{{imagePath}}" class='shengcheng'></image><button class='baocun' bindtap='baocun'>保存相册，分享到朋友圈</button></view><view hidden="{{maskHidden == false}}" class="mask"></view> <view class="canvas-box"><canvas style="width: 375px;height: 667px;position:fixed;top:9999px" canvas-id="mycanvas"/></view> </view>
wxss文件
/* 海报 */.shareText{display: block;text-align: center;color: #333;font-size: 34rpx;margin-top: 50rpx;font-weight: 700;}.imgBox{text-align: center;width: 100%;margin-top:35rpx;padding-bottom: 20rpx;}.img{display: inline-block;width: 70rpx;height: 70rpx;}.m_l{margin-left: 180rpx;}.zfbtn{display: inline-block ;width: 320rpx !important;height: 150rpx;border-radius: 50%;background: transparent;outline: none;border: 0;padding: 0;}button[class="zfbtn"]::after {border: 0;} button[class="zfbtn m_l"]::after {border: 0;} .imagePathBox{width: 100%;height: 100%;background: rgba(0,0,0,0.7);position: fixed;top: 0;left: 0;right: 0;bottom: 0;z-index: 10;}.shengcheng{width: 80%;height: 80%;position: fixed;top: 50rpx;left: 50%;margin-left: -40%;z-index: 10;}.baocun{display: block;width: 80% !important;height: 80rpx;padding: 0;line-height: 80rpx;text-align: center;position: fixed;bottom: 50rpx;left: 10%;background: #DD434B;color: #fff;font-size: 32rpx;border-radius: 44rpx;}button[class="baocun"]::after{border: 0;}
js文件
const app = getApp()import QRCode from '../../utils/qrcode.js';Page({/*** 页面的初始数据*/data: {// 海报背景img:"../../assets/images/img/gobg.png",// 微信图标wechat:"../../assets/images/img/wechat.png",// 朋友圈图标quan:"../../assets/images/img/quan.png",// 控制海报的显示与隐藏maskHidden: false,// 分享人的昵称name:"",// 分享人的头像touxiang:"",// 页面二维码path6: "",// 作品图片path7: ""},/*** 生命周期函数--监听页面加载*/onLoad: function (options) {var that= this// 判断是通过点击还是扫二维码进入页面// 通过扫二维码海报进入页面 if (options.scene) {var a = decodeURIComponent(options.scene) //把二维码携带的参数转成字符串，看小程序文档// 拿到作品idconsole.log(a)let id = a.split('&')[0]let MemberId = a.split('&')[1]console.log(id) console.log(MemberId)options.id = id.split('=')[1]options.MemberId = MemberId.split('=')[1]console.log(options)}// 海报结束// 拿到作品idconsole.log(options)that.setData({ProId: options.id,MemberId:options.MemberId})wx.getStorage({key:'userInfo',success:function(res){console.log(res.data)that.setData({SessionId: res.data.SessionId,Uid: res.data.Uid,// 海报用户昵称name: res.data.FirstName})// 海报wx.downloadFile({url: res.data.Face, //仅为示例，并非真实的资源success: function (res) {// 只要服务器有响应数据，就会把响应内容写入文件并进入 success 回调，业务需要自行判断是否下载到了想要的内容if (res.statusCode === 200) {console.log(res)that.setData({touxiang: res.tempFilePath})}}})}})},// 海报开始//将canvas转换为图片保存到本地，然后将图片路径传给image图片的srccreateNewImg: function () {var that = this;var context = wx.createCanvasContext('mycanvas');context.setFillStyle("#fff")context.fillRect(0, 0, 375, 667)var path = "../../assets/images/img/gobg.png";//将模板图片绘制到canvas,在开发工具中drawImage()函数有问题，不显示图片//不知道是什么原因，手机环境能正常显示context.drawImage(path, 0, 0, 375, 183);var path1 = that.data.touxiang;console.log(path1,"path1")//将模板图片绘制到canvas,在开发工具中drawImage()函数有问题，不显示图片var path2 = "../../assets/images/img/txquan.png";// var path3 = "../../assets/images/img/heise.png";var path4 = "../../assets/images/img/wenziBg.png";var path5 = "../../assets/images/img/wenxin.png";var path6 = that.data.path6;var path7 = "../../assets/images/img/small.jpg"context.drawImage(path2, 126, 56, 120, 120);//不知道是什么原因，手机环境能正常显示// context.save(); // 保存当前context的状态var name = that.data.name;//绘制名字context.setFontSize(24);context.setFillStyle('#333333');context.setTextAlign('center');context.fillText(name, 185, 200);context.stroke();//绘制作品图片context.drawImage(path7, 37, 236, 300, 220);//绘制左下角文字背景图context.drawImage(path4, 25, 520, 184, 82);context.setFontSize(12);context.setFillStyle('#333');context.setTextAlign('left');context.fillText("快来和我们一起看画栈网中", 35, 540);context.stroke();context.setFontSize(12);context.setFillStyle('#333');context.setTextAlign('left');context.fillText("各位画友的精华之作吧！", 35, 560);context.stroke();context.setFontSize(12);context.setFillStyle('#333');context.setTextAlign('left');context.fillText("你值得拥有~", 35, 580);context.stroke();//绘制右下角扫码提示语context.drawImage(path5, 248, 578, 90, 25);//绘制右下角二维码context.drawImage(path6, 248, 482, 90, 90);//绘制头像context.arc(186, 116, 50, 0, 2 * Math.PI) //画出圆context.strokeStyle = "#DD434B";context.clip(); //裁剪上面的圆形context.drawImage(path1, 136, 66, 100, 100); // 在刚刚裁剪的园上画图context.draw();//将生成好的图片保存到本地，需要延迟一会，绘制期间耗时setTimeout(function () {wx.canvasToTempFilePath({canvasId: 'mycanvas',success: function (res) {var tempFilePath = res.tempFilePath;that.setData({imagePath: tempFilePath,canvasHidden:true});},fail: function (res) {console.log(res);}});}, 200);},//点击保存到相册baocun:function(){var that = thiswx.saveImageToPhotosAlbum({filePath: that.data.imagePath,success(res) {wx.showModal({content: '图片已保存到相册，赶紧晒一下吧~',showCancel: false,confirmText: '好的',confirmColor: '#333',success: function (res) {if (res.confirm) {console.log('用户点击确定');/* 该隐藏的隐藏 */that.setData({maskHidden: false})}},fail:function(res){console.log(11111)}})}})},//点击生成formSubmit:async function () {var that = this;wx.request({url: 'https://api./cgi-bin/token',header: {'content-type': 'application/json' },data: {grant_type: 'client_credential',appid:'小程序appid',//小程序开发者进入后台可以看到secret: '秘钥'//小程序开发者进入后台可以看到},success:function(res) {console.log(res)wx.request({// 调用接口Curl: 'https://api./wxa/getwxacodeunlimit?access_token=' + res.data.access_token,method: 'POST',responseType: 'arraybuffer',data: {"page": 'pages/megagame-workDetails/megagame-workDetails', // 要生成二维码的页面路径"width": 200, // 二维码的大小'scene': 'id='+ that.data.ProId + '&' + 'MemberId=' + that.data.MemberId // 页面需要携带的参数},success(res) {console.log(res)let base64 = wx.arrayBufferToBase64(res.data)console.log(base64)that.setData({path6: 'data:image/PNG;base64,' + base64})console.log(that.data.path6)},fail(err){console.log(err)}})}})that.setData({maskHidden: false, });wx.showToast({title: '生成中...',icon: 'loading',duration: 1000});setTimeout(function () {wx.hideToast()that.createNewImg();that.setData({maskHidden: true});}, 1000)},// 海报结束/*** 生命周期函数--监听页面初次渲染完成*/onReady: function () {},/*** 生命周期函数--监听页面显示*/onShow: function () {},/*** 生命周期函数--监听页面隐藏*/onHide: function () {},/*** 生命周期函数--监听页面卸载*/onUnload: function () {},/*** 页面相关事件处理函数--监听用户下拉动作*/onPullDownRefresh: function () {},/*** 页面上拉触底事件的处理函数*/onReachBottom: function () {},/*** 用户点击右上角分享*/onShareAppMessage: function (res) {}})
需要用到的path
