C端小程序
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  1. var config = require("../../config/config.js");
  2. var app = getApp();
  3. const Http = require("../../utils/HttpBasics");
  4. const util = require("../../utils/util");
  5. const imgurl = require("../../utils/imgurl");
  6. Page({
  7. /**
  8. * 页面的初始数据
  9. */
  10. data: {
  11. poterbg: imgurl.poterbg.url,
  12. windowWidth: wx.getSystemInfoSync().windowWidth,
  13. windowHeight: wx.getSystemInfoSync().screenHeight,
  14. totalHeight: 0,
  15. mallname: '', //商场名字
  16. qrCodeL: "", //小程序码
  17. couponList: [], //活动劵列表
  18. 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
  19. },
  20. /**
  21. * 生命周期函数--监听页面加载
  22. */
  23. onLoad: function(options) {
  24. let that = this;
  25. //劵详情
  26. if (options && options.couponChannelId) {
  27. that.getDetail(options.couponChannelId);
  28. } else if (options && options.merchantId) {
  29. that.getList(options.merchantId);
  30. that.getCouponList(options.merchantId);
  31. }
  32. this.getUserInfo();
  33. this.getMallInfo();
  34. this.begainDrawShareImage(options);
  35. },
  36. /**
  37. * 获取劵详情
  38. */
  39. getDetail: function(couponChannelId) {
  40. let that = this;
  41. // 获取用户信息
  42. Http.get({
  43. url: config.api.couponDetail,
  44. data: {
  45. couponChannelId: couponChannelId
  46. }
  47. }).then(res => {
  48. that.setData({
  49. data: res.data
  50. });
  51. });
  52. },
  53. /**
  54. * 获取商户详情
  55. */
  56. getList: function(id) {
  57. let that = this;
  58. let data;
  59. data = {
  60. pageNum: 1,
  61. pageSize: 15,
  62. id: id
  63. };
  64. Http.get({
  65. url: config.api.merchantList,
  66. data: data
  67. })
  68. .then(res => {
  69. that.setData({
  70. data: res.data.list[0]
  71. });
  72. })
  73. .catch(err => {
  74. wx.showToast({
  75. title: err.errMsg,
  76. icon: "none",
  77. duration: 2000,
  78. mask: false
  79. });
  80. });
  81. },
  82. /**
  83. * 绘制分享海报
  84. */
  85. begainDrawShareImage(options) {
  86. wx.showLoading({
  87. title: "生成中..."
  88. });
  89. var that = this;
  90. // 适配屏幕
  91. let scale = this.data.windowWidth / 375.0
  92. console.log(scale)
  93. this.setData({
  94. totalHeight: 667 * scale
  95. })
  96. // 获取Canvas
  97. let ctx = wx.createCanvasContext("myCanvas");
  98. // 获取宽高
  99. let wW = that.data.windowWidth;
  100. let wH = that.data.windowHeight;
  101. // 放大 因为不放大的话,生成的分享图会模糊。暂时先注释
  102. ctx.scale(this.data.canvasScale, this.data.canvasScale);
  103. // 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
  104. let bgimg1 = that.data.poterbg + `?imageView/2/w/${wW}/h/${wH}`;
  105. let bgimg2 = util.getProxyImgUrl(bgimg1);
  106. wx.getImageInfo({
  107. src: bgimg2,
  108. success: function(res) {
  109. that.drawshopimg(ctx, scale, options);
  110. ctx.draw(true);
  111. }
  112. });
  113. },
  114. //绘制商品图片
  115. drawshopimg(ctx, scale, options) {
  116. var that = this;
  117. let topImageWidth = parseInt(375 * scale); // 因为小数有时候会请求不到图片,所以转成int
  118. let topImageHeight = parseInt(260 * scale);
  119. let src1 = "";
  120. let src2 = "";
  121. //劵详情海报
  122. if (options && options.couponChannelId) {
  123. src1 = that.data.data.coverImg + `?imageView/2/w/${topImageWidth}/h/${topImageHeight}`;
  124. src2 = util.getProxyImgUrl(src1);
  125. } else if (options && options.merchantId) {
  126. //商户详情海报
  127. src1 = that.data.data.merchantImgUrl + `?imageView/2/w/${topImageWidth}/h/${topImageHeight}`;
  128. src2 = util.getProxyImgUrl(src1);
  129. }
  130. wx.getImageInfo({
  131. src: src2,
  132. success: function(res) {
  133. // 绘制白色背景
  134. ctx.setFillStyle("#fbfbfb");
  135. ctx.fillRect(0, 0, that.data.windowWidth, that.data.windowHeight);
  136. ctx.drawImage(res.path, 0, 50, topImageWidth, topImageHeight);
  137. that.roundRect(ctx, 15 * scale, 270 * scale, 325 * scale, 125 * scale, 10);
  138. that.drawOtherImage(ctx, scale);
  139. that.drawOtherContent(ctx, scale, options);
  140. that.drawAvatarimg(ctx, scale);
  141. that.drawqrCode(ctx, scale);
  142. wx.hideLoading();
  143. }
  144. });
  145. },
  146. //绘制微信头像
  147. drawAvatarimg(ctx, scale) {
  148. var that = this;
  149. //商户详情海报
  150. let src1 = that.data.avatarUrl + `?imageView/2/w/${100}/h/${100}`;
  151. let src2 = util.getProxyImgUrl(src1);
  152. wx.getImageInfo({
  153. src: src2,
  154. success: function(res) {
  155. that.darwAvatarArc(ctx, res.path, 10, 8, 35, 35);
  156. }
  157. });
  158. },
  159. // 商户海报绘制
  160. drawOtherContent(ctx, scale, options) {
  161. let that = this;
  162. //昵称
  163. this.drawNormalText(ctx, this.data.nickName, 43 * scale, 24 * scale, 16 * scale, "#000", "left", "middle", scale);
  164. this.drawNormalText(ctx, " 向您推荐", 120 * scale, 25 * scale, 16 * scale, "#848484", "left", "middle", scale);
  165. this.drawNormalText(ctx, "---" + this.data.mallname + "---", 175 * scale, 500 * scale, 16 * scale, "#000", "left", "middle", scale);
  166. if (options && options.merchantId) {
  167. //店铺名
  168. this.drawNormalText(ctx, "商户名称:" + this.data.data.merchantName, 40 * scale, 310 * scale, 22 * scale, "#000", "left", "middle", scale);
  169. 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);
  170. this.drawNormalText(ctx, "商户电话:" + this.data.data.merchantLinkPhone, 40 * scale, 390 * scale, 16 * scale, "#000", "left", "middle", scale);
  171. this.drawNormalText(ctx, "长按识别,进店去看看", 155 * scale, 470 * scale, 16 * scale, "#000", "left", "middle", scale);
  172. if (this.data.couponList.length > 0) {
  173. for (let i = 0; i < this.data.couponList.length; i++) {
  174. // 第一个商品信息
  175. this.drawNormalText(ctx, this.substrTile(this.data.couponList[1].title), 30 * scale, 396 * scale, 14 * scale, "#000", "left", "middle", scale);
  176. this.drawNormalText(ctx, "价格:" + this.data.couponList[1].salePrice, 30 * scale, 416 * scale, 14 * scale, "#FF3232", "left", "middle", scale);
  177. //第二个商品信息
  178. this.drawNormalText(ctx, this.substrTile(this.data.couponList[2].title), 145 * scale, 396 * scale, 14 * scale, "#000", "left", "middle", scale);
  179. this.drawNormalText(ctx, "价格:" + this.data.couponList[2].salePrice, 145 * scale, 416 * scale, 14 * scale, "#FF3232", "left", "middle", scale);
  180. //第三个商品信息
  181. this.drawNormalText(ctx, this.substrTile(this.data.couponList[3].title), 260 * scale, 396 * scale, 14 * scale, "#000", "left", "middle", scale);
  182. this.drawNormalText(ctx, "价格:" + this.data.couponList[3].salePrice, 260 * scale, 416 * scale, 14 * scale, "#FF3232", "left", "middle", scale);
  183. }
  184. }
  185. } else if (options && options.couponChannelId) {
  186. this.drawNormalText(ctx, "长按识别,进店去看看", 155 * scale, 470 * scale, 16 * scale, "#000", "left", "middle", scale);
  187. this.drawNormalText(ctx, this.data.data.title, 30 * scale, 295 * scale, 20 * scale, "#000", "left", "middle", scale);
  188. this.drawNormalText(ctx, "售价:" + this.data.data.salePriceStr + "元", 30 * scale, 320 * scale, 15 * scale, "#F4AA91", "left", "middle", scale);
  189. // this.drawNormalText(ctx, "原价:" + this.data.data.salePriceStr, 120 * scale, 340 * scale, 16 * scale, "#DFDCDB", "left", "middle", scale);
  190. this.drawNormalText(ctx, "适用门店:", 30 * scale, 348 * scale, 16 * scale, "#000", "left", "middle", scale);
  191. //适用门店字体的排列
  192. this.data.data.merchantVoList.map(function (file, index) {
  193. let word = file.merchantName;
  194. let metrics = ctx.measureText(word).width;
  195. metrics += metrics;
  196. that.drawNormalText(ctx, that.data.data.merchantVoList[index].merchantName,metrics, 375 * scale, 14 * scale, "#000", "left", "middle", scale);
  197. })
  198. ctx.draw(true);
  199. }
  200. ctx.draw(true);
  201. },
  202. //绘制小程序码
  203. drawqrCode(ctx, scale) {
  204. let coImageWidth = parseInt(120 * scale);
  205. let coImageHeight = parseInt(120 * scale);
  206. let src1 = "";
  207. let src2 = "";
  208. if (this.data.qrCode) {
  209. src1 =
  210. this.data.qrCode + `?imageView/2/w/${coImageWidth}/h/${coImageHeight}`;
  211. src2 = util.getProxyImgUrl(src1);
  212. } else {
  213. src1 =
  214. this.data.data.qrCode +
  215. `?imageView/2/w/${coImageWidth}/h/${coImageHeight}`;
  216. src2 = util.getProxyImgUrl(src1);
  217. }
  218. wx.getImageInfo({
  219. src: src2,
  220. success: function(res) {
  221. ctx.drawImage(res.path, 25 * scale, 420 * scale, coImageWidth, coImageHeight);
  222. ctx.draw(true);
  223. }
  224. });
  225. },
  226. // 绘制活动图片
  227. drawOtherImage(ctx, scale) {
  228. var that = this;
  229. // 如果该商户有活动商品
  230. if (that.data.couponList.length > 0) {
  231. let cotentImageWidth = parseInt(80 * scale);
  232. let cotentImageHeight = parseInt(80 * scale);
  233. for (let i = 0; i < that.data.couponList.length; i++) {
  234. let imageItem = that.data.couponList[i].coverImg;
  235. let src1 = imageItem + `?imageView/2/w/${cotentImageWidth}/h/${cotentImageHeight}`;
  236. let src2 = util.getProxyImgUrl(src1);
  237. wx.getImageInfo({
  238. src: src2,
  239. success: function(res) {
  240. ctx.drawImage(res.path, 35 * scale + i * 110 * scale, 300 * scale, cotentImageWidth, cotentImageHeight);
  241. }
  242. });
  243. }
  244. }
  245. that.drawqrCode(ctx, scale);
  246. },
  247. //截取商品名
  248. substrTile(str) {
  249. return str.substr(0, 5) + "...";
  250. },
  251. // 绘制只有一行的文字
  252. drawNormalText(ctx, str, x, y, font, style, align, baseLine) {
  253. ctx.setFontSize(font);
  254. ctx.setFillStyle(style);
  255. ctx.setTextAlign(align);
  256. ctx.setTextBaseline(baseLine);
  257. ctx.fillText(str, x, y);
  258. },
  259. /*
  260. * 绘制多行文本,自动换行,超出添加...
  261. *
  262. */
  263. canvasTextAutoLine: function(
  264. str,
  265. ctx,
  266. initX,
  267. initY,
  268. lineHeight,
  269. maxWidth,
  270. row = 1
  271. ) {
  272. var lineWidth = 0;
  273. var lastSubStrIndex = 0;
  274. var currentRow = 1;
  275. for (let i = 0; i < str.length; i++) {
  276. lineWidth += ctx.measureText(str[i]).width;
  277. if (lineWidth > maxWidth) {
  278. currentRow++;
  279. let newStr = str.substring(lastSubStrIndex, i);
  280. if (currentRow > row && str.length > i) {
  281. newStr = str.substring(lastSubStrIndex, i - 2) + "...";
  282. }
  283. ctx.fillText(newStr, initX, initY);
  284. initY += lineHeight;
  285. lineWidth = 0;
  286. lastSubStrIndex = i;
  287. if (currentRow > row) {
  288. break;
  289. }
  290. }
  291. if (i == str.length - 1) {
  292. ctx.fillText(str.substring(lastSubStrIndex, i + 1), initX, initY);
  293. }
  294. }
  295. },
  296. //绘制圆角图像
  297. darwAvatarArc: function(ctx, src, x, y, w, h = w) {
  298. /*
  299. ctx: 画布对象
  300. src: 头像缓存路径
  301. x: 头像起始位置 横坐标
  302. y: 头像起始位置 纵坐标
  303. w: 头像宽度
  304. h: 头像高度,不传为w
  305. */
  306. // 保存绘图上下文。
  307. ctx.save();
  308. // 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
  309. ctx.beginPath();
  310. // 设创建一个圆可以指定 起始弧度为 0,终止弧度为 2 * Math.PI。
  311. // 用 stroke 或者 fill 方法来在 canvas 中画弧线。
  312. ctx.arc(x + w / 2, y + h / 2, w / 2, 0, Math.PI * 2, false);
  313. /* 从原始画布中剪切任意形状和尺寸。
  314. 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(
  315. 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。
  316. */
  317. ctx.clip();
  318. // 画头像
  319. ctx.drawImage(src, x, y, w, h);
  320. // 恢复之前保存的绘图上下文。
  321. ctx.restore();
  322. // 将之前在绘图上下文中的描述(路径、变形、样式)画到 canvas 中。
  323. ctx.draw(true);
  324. },
  325. //绘制圆角矩形
  326. roundRect: function(ctx, x, y, w, h, r) {
  327. ctx.save();
  328. if (w < 2 * r) {
  329. r = w / 2;
  330. }
  331. if (h < 2 * r) {
  332. r = h / 2;
  333. }
  334. ctx.beginPath();
  335. // ctx.setStrokeStyle('white');
  336. ctx.setFillStyle('#fff')
  337. ctx.setLineWidth(4);
  338. ctx.moveTo(x + r, y);
  339. ctx.arcTo(x + w, y, x + w, y + h, r);
  340. ctx.arcTo(x + w, y + h, x, y + h, r);
  341. ctx.arcTo(x, y + h, x, y, r);
  342. ctx.arcTo(x, y, x + w, y, r);
  343. ctx.fill();
  344. ctx.closePath();
  345. ctx.draw(true);
  346. },
  347. //获取商户优惠劵信息
  348. getCouponList: function(id) {
  349. let that = this;
  350. let data;
  351. data = {
  352. status: 0,
  353. merchantId: id,
  354. pageNum: 1,
  355. pageSize: 15
  356. };
  357. Http.get({
  358. url: config.api.listByMerchant,
  359. data: data
  360. })
  361. .then(res => {
  362. that.setData({
  363. couponList: res.data.page.list,
  364. qrCode: res.data.qrCode
  365. });
  366. })
  367. .catch(err => {
  368. wx.showToast({
  369. title: err.errMsg,
  370. icon: "none",
  371. duration: 2000,
  372. mask: false
  373. });
  374. });
  375. },
  376. //获取头像和昵称
  377. getUserInfo: function() {
  378. let that = this;
  379. // 获取用户信息
  380. Http.get({
  381. url: config.api.getScore,
  382. data: {}
  383. }).then(res => {
  384. that.setData({
  385. nickName: res.data.nickName,
  386. avatarUrl: res.data.avatarUrl
  387. });
  388. });
  389. },
  390. //商场信息
  391. getMallInfo: function() {
  392. let that = this;
  393. // 获取用户信息
  394. Http.get({
  395. url: config.api.getMallInfo,
  396. data: {}
  397. }).then(res => {
  398. console.log(res);
  399. that.setData({
  400. mallname: res.data.name
  401. });
  402. });
  403. },
  404. /**
  405. * 保存图片
  406. */
  407. saveImage() {
  408. let that = this;
  409. wx.canvasToTempFilePath({
  410. x: 0,
  411. y: 0,
  412. width: this.data.windowWidth * this.data.canvasScale,
  413. height: this.data.totalHeight * this.data.canvasScale,
  414. canvasId: "myCanvas",
  415. success: function(res) {
  416. that.saveImageToPhotos(res.tempFilePath);
  417. },
  418. fail: function(res) {
  419. wx.showToast({
  420. title: "图片生成失败",
  421. icon: "none",
  422. duration: 2000
  423. });
  424. }
  425. });
  426. },
  427. saveImageToPhotos: function(tempFilePath) {
  428. wx.saveImageToPhotosAlbum({
  429. filePath: tempFilePath,
  430. success(result) {
  431. wx.showToast({
  432. title: "保存成功,从相册中分享到朋友圈吧",
  433. icon: "none",
  434. duration: 4000
  435. });
  436. },
  437. fail: function(err) {
  438. if (
  439. err.errMsg === "saveImageToPhotosAlbum:fail:auth denied" ||
  440. err.errMsg === "saveImageToPhotosAlbum:fail auth deny"
  441. ) {
  442. // 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
  443. wx.showModal({
  444. title: "提示",
  445. content: "需要您授权保存相册",
  446. showCancel: false,
  447. success: modalSuccess => {
  448. wx.openSetting({
  449. success(settingdata) {
  450. console.log("settingdata", settingdata);
  451. if (settingdata.authSetting["scope.writePhotosAlbum"]) {
  452. wx.showModal({
  453. title: "提示",
  454. content: "获取权限成功,再次点击图片即可保存",
  455. showCancel: false
  456. });
  457. } else {
  458. wx.showModal({
  459. title: "提示",
  460. content: "获取权限失败,将无法保存到相册哦~",
  461. showCancel: false
  462. });
  463. }
  464. },
  465. fail(failData) {
  466. console.log("failData", failData);
  467. },
  468. complete(finishData) {
  469. console.log("finishData", finishData);
  470. }
  471. });
  472. }
  473. });
  474. }
  475. }
  476. });
  477. }
  478. });