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, 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.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 => { console.log(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) { ctx.drawImage(res.path, 0, 0, wW - 20, wH); that.drawshopimg(ctx, scale, options); ctx.draw(true) } }) }, //绘制商品图片 drawshopimg(ctx, scale, options) { var that = this let topImageWidth = parseInt(315 * scale) // 因为小数有时候会请求不到图片,所以转成int let topImageHeight = parseInt(200 * 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) this.drawNormalText(ctx, "长按二维码识别小程序享优惠", 85 * scale, 570 * scale, 16 * scale, '#000', 'left', 'middle', scale); } 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) this.drawNormalText(ctx, "长按二维码识别小程序进店逛逛", 85 * scale, 570 * scale, 16 * scale, '#000', 'left', 'middle', scale); } wx.getImageInfo({ src: src2, success: function (res) { if (options && options.merchantId) { // 绘制白色背景 ctx.setFillStyle('#fff') ctx.fillRect(15, 45, topImageWidth + 10, topImageHeight + 10) ctx.drawImage(res.path, 20, 50, topImageWidth, topImageHeight) that.drawOtherImage(ctx, scale) that.drawOtherContent(ctx, scale) } else if ((options && options.couponChannelId)) { ctx.setFillStyle('#fff') ctx.fillRect(15, 95, topImageWidth + 10, topImageHeight + 10) ctx.drawImage(res.path, 20, 100, topImageWidth, topImageHeight) that.drawCouponContent(ctx, scale) that.drawqrCode(ctx, scale); } wx.hideLoading() } }) }, // 商户海报绘制 drawOtherContent(ctx, scale) { //昵称 this.drawNormalText(ctx, this.data.nickName + " 向您推荐", 20 * scale, 25 * scale, 16 * scale, '#fff', 'left', 'middle', scale); //店铺名 this.drawNormalText(ctx, this.data.data.merchantName, 180 * scale, 280 * scale, 30 * scale, '#fff', 'center', '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); } } ctx.draw(true) }, // 劵海报绘制 drawCouponContent(ctx, scale) { //昵称 this.drawNormalText(ctx, this.data.data.title, 20 * scale, 25 * scale, 30 * scale, '#fff', 'left', 'middle', scale); this.drawNormalText(ctx, "售价:" + this.data.data.salePriceStr, 50 * scale, 65 * scale, 30 * scale, '#fff', 'left', 'middle', scale); ctx.draw(true) }, //绘制小程序码 drawqrCode(ctx, scale) { let coImageWidth = parseInt(120 * scale) let coImageHeight = parseInt(120 * scale) let src1 = "" let src2 = '' if (this.data.qrCode) { src1 = this.data.qrCode + `?imageView/2/w/${coImageWidth}/h/${coImageHeight}` src2 = util.getProxyImgUrl(src1) } else { src1 = this.data.data.qrCode + `?imageView/2/w/${coImageWidth}/h/${coImageHeight}` src2 = util.getProxyImgUrl(src1) } wx.getImageInfo({ src: src2, success: function (res) { ctx.drawImage(res.path, 125 * scale, 425 * scale, coImageWidth, coImageHeight) ctx.draw(true) } }) }, // 绘制活动图片 drawOtherImage(ctx, scale) { var that = this // 如果该商户有活动商品 if (that.data.couponList.length > 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); } } }, //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 => { console.log(res) that.setData({ nickName: res.data.nickName, avatarUrl: res.data.avatarUrl }) }) }, /** * 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) } }) } }) } }, }) }, /** * 用户点击右上角分享 */ onShareAppMessage: function () { } })