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- 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)
- }
- })
- }
- })
- }
- },
- })
- }
- })
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