var config = require("../../config/config.js"); var app = getApp(); const Http = require("../../utils/HttpBasics"); const util = require("../../utils/util"); const imgurl = require("../../utils/imgurl"); Page({ /** * 页面的初始数据 */ data: { poterbg: imgurl.poterbg.url, windowWidth: wx.getSystemInfoSync().windowWidth, windowHeight: wx.getSystemInfoSync().screenHeight, totalHeight: 0, mallname:'',//商场名字 qrCodeL: "", //小程序码 couponList: [], //活动劵列表 canvasScale: 1.0 // 画布放大的倍数,因为如果保存的是一倍的分享图片的话,分享图会有点虚。所以保存的时候,canvasScale设置为2.0,wxss 里面的left: 500%;打开注释。就可保存两倍的分享图 }, /** * 生命周期函数--监听页面加载 */ onLoad: function(options) { let that = this; //劵详情 if (options && options.couponChannelId) { that.getDetail(options.couponChannelId); } else if (options && options.merchantId) { that.getList(options.merchantId); that.getCouponList(options.merchantId); } this.getUserInfo(); this.getMallInfo(); this.begainDrawShareImage(options); }, /** * 获取劵详情 */ getDetail: function(couponChannelId) { let that = this; // 获取用户信息 Http.get({ url: config.api.couponDetail, data: { couponChannelId: couponChannelId } }).then(res => { that.setData({ data: res.data }); }); }, /** * 获取商户详情 */ getList: function(id) { let that = this; let data; data = { pageNum: 1, pageSize: 15, id: id }; Http.get({ url: config.api.merchantList, data: data }) .then(res => { that.setData({ data: res.data.list[0] }); }) .catch(err => { wx.showToast({ title: err.errMsg, icon: "none", duration: 2000, mask: false }); }); }, /** * 绘制分享海报 */ begainDrawShareImage(options) { wx.showLoading({ title: "生成中..." }); var that = this; // 适配屏幕 let scale = this.data.windowWidth / 375.0; this.setData({ totalHeight: 767 * scale }); // 获取Canvas let ctx = wx.createCanvasContext("myCanvas"); // 获取宽高 let wW = that.data.windowWidth; let wH = that.data.windowHeight; // 放大 因为不放大的话,生成的分享图会模糊。暂时先注释 ctx.scale(this.data.canvasScale, this.data.canvasScale); // 首先要绘制顶部的背景图片,因为它在最底层,然后才能绘制其他内容 let bgimg1 = that.data.poterbg + `?imageView/2/w/${wW}/h/${wH}`; let bgimg2 = util.getProxyImgUrl(bgimg1); wx.getImageInfo({ src: bgimg2, success: function(res) { that.drawshopimg(ctx, scale, options); ctx.draw(true); } }); }, //绘制商品图片 drawshopimg(ctx, scale, options) { var that = this; let topImageWidth = parseInt(375 * scale); // 因为小数有时候会请求不到图片,所以转成int let topImageHeight = parseInt(260 * scale); let src1 = ""; let src2 = ""; //劵详情海报 if (options && options.couponChannelId) { src1 =that.data.data.coverImg +`?imageView/2/w/${topImageWidth}/h/${topImageHeight}`; src2 = util.getProxyImgUrl(src1); } else if (options && options.merchantId) { //商户详情海报 src1 =that.data.data.merchantImgUrl +`?imageView/2/w/${topImageWidth}/h/${topImageHeight}`; src2 = util.getProxyImgUrl(src1); } wx.getImageInfo({ src: src2, success: function(res) { // 绘制白色背景 ctx.setFillStyle("#fbfbfb"); ctx.fillRect(0, 0, that.data.windowWidth, that.data.windowHeight); ctx.drawImage(res.path, 0, 50, topImageWidth, topImageHeight); that.roundRect(ctx,12, 270, 320, 150,10) that.drawOtherImage(ctx, scale); that.drawOtherContent(ctx, scale,options); that.drawAvatarimg(ctx, scale); that.drawqrCode(ctx, scale); wx.hideLoading(); } }); }, //绘制微信头像 drawAvatarimg(ctx, scale) { var that = this; //商户详情海报 let src1 =that.data.avatarUrl +`?imageView/2/w/${100}/h/${100}`; let src2 = util.getProxyImgUrl(src1); wx.getImageInfo({ src: src2, success: function(res) { that.darwAvatarArc(ctx, res.path, 10, 8, 35, 35); } }); }, // 商户海报绘制 drawOtherContent(ctx, scale,options) { //昵称 this.drawNormalText(ctx,this.data.nickName,60 * scale,25 * scale,16 * scale,"#000","left","middle",scale); this.drawNormalText(ctx," 向您推荐",120 * scale,25 * scale,16 * scale,"#848484","left","middle",scale); this.drawNormalText(ctx,"---"+this.data.mallname+"---",175 * scale,530 * scale,16 * scale,"#000","left","middle",scale); if (options && options.merchantId) { //店铺名 this.drawNormalText(ctx,"商户名称:"+this.data.data.merchantName,40 * scale,310 * scale,22 * scale,"#000","left","middle",scale); this.drawNormalText(ctx,"商户位置:"+this.data.data.shopVoList[0].buildingName+this.data.data.shopVoList[0].floorName+"--"+this.data.data.shopVoList[0].shopNumber,40 * scale,350 * scale,18 * scale,"#F4AA91","left","middle",scale); this.drawNormalText(ctx,"商户电话:"+this.data.data.merchantLinkPhone,40 * scale,390 * scale,16 * scale,"#000","left","middle",scale); this.drawNormalText(ctx,"长按识别,进店去看看",155 * scale,510 * scale,16 * scale,"#000","left","middle",scale); if (this.data.couponList.length > 0) { for (let i = 0; i < this.data.couponList.length; i++) { // 第一个商品信息 this.drawNormalText(ctx,this.substrTile(this.data.couponList[1].title),30 * scale,396 * scale,14 * scale,"#000","left","middle",scale); this.drawNormalText(ctx,"价格:" + this.data.couponList[1].salePrice,30 * scale,416 * scale,14 * scale,"#FF3232","left","middle",scale); //第二个商品信息 this.drawNormalText(ctx,this.substrTile(this.data.couponList[2].title),145 * scale,396 * scale,14 * scale,"#000","left","middle",scale); this.drawNormalText(ctx,"价格:" + this.data.couponList[2].salePrice,145 * scale,416 * scale,14 * scale,"#FF3232","left","middle",scale); //第三个商品信息 this.drawNormalText(ctx,this.substrTile(this.data.couponList[3].title),260 * scale,396 * scale,14 * scale,"#000","left","middle",scale); this.drawNormalText(ctx,"价格:" + this.data.couponList[3].salePrice,260 * scale,416 * scale,14 * scale,"#FF3232","left","middle",scale); } } } else if (options && options.couponChannelId) { this.drawNormalText(ctx,"长按识别,享优惠",155 * scale,500 * scale,16 * scale,"#000","left","middle",scale); this.drawNormalText(ctx,this.data.data.title,40 * scale,310 * scale,23 * scale,"#000","left","middle",scale); this.drawNormalText(ctx,"售价:" + this.data.data.salePriceStr,40 * scale,340 * scale,20* scale,"#F4AA91","left","middle",scale); this.drawNormalText(ctx,"原价:" + this.data.data.salePriceStr,120 * scale,340 * scale,16 * scale,"#DFDCDB","left","middle",scale); this.drawNormalText(ctx,"适用门店:",40 * scale,370 * scale,16 * scale,"#000","left","middle",scale); for(var i=0;i 0) { let cotentImageWidth = parseInt(80 * scale); let cotentImageHeight = parseInt(80 * scale); for (let i = 0; i < that.data.couponList.length; i++) { let imageItem = that.data.couponList[i].coverImg; let src1 =imageItem +`?imageView/2/w/${cotentImageWidth}/h/${cotentImageHeight}`; let src2 = util.getProxyImgUrl(src1); wx.getImageInfo({ src: src2, success: function(res) { ctx.drawImage(res.path,35 * scale + i * 110 * scale,300 * scale,cotentImageWidth,cotentImageHeight); } }); } } that.drawqrCode(ctx, scale); }, //截取商品名 substrTile(str) { return str.substr(0, 5) + "..."; }, // 绘制只有一行的文字 drawNormalText(ctx, str, x, y, font, style, align, baseLine) { ctx.setFontSize(font); ctx.setFillStyle(style); ctx.setTextAlign(align); ctx.setTextBaseline(baseLine); ctx.fillText(str, x, y); }, /* * 绘制多行文本,自动换行,超出添加... * */ canvasTextAutoLine: function( str, ctx, initX, initY, lineHeight, maxWidth, row = 1 ) { var lineWidth = 0; var lastSubStrIndex = 0; var currentRow = 1; for (let i = 0; i < str.length; i++) { lineWidth += ctx.measureText(str[i]).width; if (lineWidth > maxWidth) { currentRow++; let newStr = str.substring(lastSubStrIndex, i); if (currentRow > row && str.length > i) { newStr = str.substring(lastSubStrIndex, i - 2) + "..."; } ctx.fillText(newStr, initX, initY); initY += lineHeight; lineWidth = 0; lastSubStrIndex = i; if (currentRow > row) { break; } } if (i == str.length - 1) { ctx.fillText(str.substring(lastSubStrIndex, i + 1), initX, initY); } } }, //绘制圆角图像 darwAvatarArc: function(ctx, src, x, y, w, h = w) { /* ctx: 画布对象 src: 头像缓存路径 x: 头像起始位置 横坐标 y: 头像起始位置 纵坐标 w: 头像宽度 h: 头像高度,不传为w */ // 保存绘图上下文。 ctx.save(); // 开始创建一个路径。需要调用 fill 或者 stroke 才会使用路径进行填充或描边 ctx.beginPath(); // 设创建一个圆可以指定 起始弧度为 0,终止弧度为 2 * Math.PI。 // 用 stroke 或者 fill 方法来在 canvas 中画弧线。 ctx.arc(x + w / 2, y + h / 2, w / 2, 0, Math.PI * 2, false); /* 从原始画布中剪切任意形状和尺寸。 一旦剪切了某个区域,则所有之后的绘图都会被限制在被剪切的区域内( 不能访问画布上的其他区域)。可以在使用 clip 方法前通过使用 save 方法对当前画布区域进行保存,并在以后的任意时间通过restore方法对其进行恢复。 */ ctx.clip(); // 画头像 ctx.drawImage(src, x, y, w, h); // 恢复之前保存的绘图上下文。 ctx.restore(); // 将之前在绘图上下文中的描述(路径、变形、样式)画到 canvas 中。 ctx.draw(true); }, //绘制圆角矩形 roundRect:function(ctx, x, y, w, h, r) { ctx.save(); if (w < 2 * r) {r = w / 2;} if (h < 2 * r){ r = h / 2;} ctx.beginPath(); // ctx.setStrokeStyle('white'); ctx.setFillStyle('white') ctx.setLineWidth(4); ctx.moveTo(x+r, y); ctx.arcTo(x+w, y, x+w, y+h, r); ctx.arcTo(x+w, y+h, x, y+h, r); ctx.arcTo(x, y+h, x, y, r); ctx.arcTo(x, y, x+w, y, r); ctx.fill(); ctx.closePath(); ctx.draw(true); }, //获取商户优惠劵信息 getCouponList: function(id) { let that = this; let data; data = { status: 0, merchantId: id, pageNum: 1, pageSize: 15 }; Http.get({ url: config.api.listByMerchant, data: data }) .then(res => { that.setData({ couponList: res.data.page.list, qrCode: res.data.qrCode }); }) .catch(err => { wx.showToast({ title: err.errMsg, icon: "none", duration: 2000, mask: false }); }); }, //获取头像和昵称 getUserInfo: function() { let that = this; // 获取用户信息 Http.get({ url: config.api.getScore, data: {} }).then(res => { that.setData({ nickName: res.data.nickName, avatarUrl: res.data.avatarUrl }); }); }, //商场信息 getMallInfo: function() { let that = this; // 获取用户信息 Http.get({ url: config.api.getMallInfo, data: {} }).then(res => { console.log(res); that.setData({ mallname:res.data.name }); }); }, /** * 保存图片 */ saveImage() { let that = this; wx.canvasToTempFilePath({ x: 0, y: 0, width: this.data.windowWidth * this.data.canvasScale, height: this.data.totalHeight * this.data.canvasScale, canvasId: "myCanvas", success: function(res) { that.saveImageToPhotos(res.tempFilePath); }, fail: function(res) { wx.showToast({ title: "图片生成失败", icon: "none", duration: 2000 }); } }); }, saveImageToPhotos: function(tempFilePath) { wx.saveImageToPhotosAlbum({ filePath: tempFilePath, success(result) { wx.showToast({ title: "保存成功,从相册中分享到朋友圈吧", icon: "none", duration: 4000 }); }, fail: function(err) { if ( err.errMsg === "saveImageToPhotosAlbum:fail:auth denied" || err.errMsg === "saveImageToPhotosAlbum:fail auth deny" ) { // 这边微信做过调整,必须要在按钮中触发,因此需要在弹框回调中进行调用 wx.showModal({ title: "提示", content: "需要您授权保存相册", showCancel: false, success: modalSuccess => { wx.openSetting({ success(settingdata) { console.log("settingdata", settingdata); if (settingdata.authSetting["scope.writePhotosAlbum"]) { wx.showModal({ title: "提示", content: "获取权限成功,再次点击图片即可保存", showCancel: false }); } else { wx.showModal({ title: "提示", content: "获取权限失败,将无法保存到相册哦~", showCancel: false }); } }, fail(failData) { console.log("failData", failData); }, complete(finishData) { console.log("finishData", finishData); } }); } }); } } }); } });