因为项目中需要实现仿微信对话功能，于是抽空实现了下，主要是h5的canvas的把图片和文字绘制到画布上

原文来自我的个人博客：http://lvhww.com/index.php/archives/6/

1.首先准备图片资源：微信头部导航，对话框，二维码等

2.API接口

3,效果图

4，代码DetailWechat.vue

<template>

  <div class="s-all">

    <v-header :name="name"></v-header>

    <!-- 人物列表 -->

    <div class="s-content active">

      <div class="s-recommend">

        <span class="span-1">荐</span>

        <span>推荐人物</span></div>

      <div class="s-recommend-people">

        <ul>

          <li v-for="item in recommendList">

            <div class="s-img">

              <img @click="drawResult(item.name,item.nickname,item._id,$event)"

                   src="../assets/images/e217d58ec3d03b1ab5df0d92589a04bb.jpg"/>

              <!--:src="item.image.replace('/game/static/images/','')"/>-->

            </div>

            <div class="s-title" v-text="item.name">

            </div>

          </li>

        </ul>

      </div>

      <div class="s-category">

        <span class="span-2">类</span>

        <span>分类</span>

      </div>

      <div class="s-category-a">

        <a class="s-bt" @click="getData(Aname.name)" v-for="Aname in Alist">{{Aname.name}}</a>

      </div>

      <div class="s-category-list">

        <ul>

          <li v-for="item in itemList">

            <a class="s-a-1" @click="drawResult(item.name,item.name,item._id)" :data-alt="item.name"

               :data-nickname="item.name" :data-num="item._id" name="s-a-1">

              <div class="s-a-img">

                <img v-lazy="item.image" class="star-icon" id="star-icon"/>

              </div>

              <div class="s-a-title">

                <div class="s-a-title-name" v-text="item.name"></div>

                <div class="s-a-title-play">

                  <span class="m-icon icon-star"></span>

                  <span class="m-icon icon-star"></span>

                  <span class="m-icon icon-star"></span>

                  <span class="m-icon icon-star"></span>

                  <span class="m-icon icon-star"></span>

                  <span class="s-people">123456人在玩</span>

                </div>

              </div>

            </a>

            <a class="s-a-2" @click="drawResult(item.name,item.name,item._id,$event)" :data-alt="item.name"

               :data-nickname="item.name" :data-num="item._id">

              开始<span class="icon-more"></span>

            </a>

          </li>

        </ul>

      </div>

    </div>

    <!-- 正在制作 -->

    <div class="box" id="page2">

      <img id="loading" class="loading" src="https://h5.tangdaoya.com/game/static/loading.png"/>

      <p id="loading-text" class="loading-text">正在生成</p>

    </div>

    <!-- 制作结果 -->

    <div class="box" id="page3">

      <div class="common-result-btnbox">

        <div class="commonbtn-playAgain btn-back" @click="changeContent()" v-if="ShowAgain">

          换个文案试试

        </div>

        <div id="btn-share" class="commonbtn-share">立即去整人</div>

      </div>

      <div class="resultimgbox">

        <img id="result" class="result" src=""/>

      </div>

    </div>

    <!-- 返回制作 -->

    <div class="box" id="page4">

      <div class="butbox common-result-btnbox">

        <div id="backtohomgpage" class="commonbtn-share">返回制作</div>

      </div>

    </div>

    <div class="" style="display: block">

      <img src="../assets/images/header.jpg" id="headerImg" alt="">

      <img src="../assets/images/footer.jpg" id="footerImg" alt="">

      <img src="../assets/images/qr.png" id="codeImg" alt="">

      <img src="../assets/images/8fe39669bff9423bb56c5586f5fa70d1.jpg" id="head2Img" alt="">

    </div>

    <img src="" id="targetImg" alt="">

  </div>

</template>

<script>

  import Vue from 'vue'

  import api from '../fetch/api.js'

  import com from '../assets/js/common'

  import axios from 'axios';

  import VueLazyload from 'vue-lazyload'

  import {Toast} from 'mint-ui'

  import VHeader from '@/components/Header.vue'

  var headImg = "" || "https://h5.tangdaoya.com/zb/static/image/cover/8fe39669bff9423bb56c5586f5fa70d1.jpg";

  var manifest = [{

    src: "https://h5.tangdaoya.com/game/static/header.jpg",

    id: "header"

  }, {

    src: "https://h5.tangdaoya.com/game/static/footer.jpg",

    id: "footer"

  }, {

    src: headImg,

    id: "head2"

  }];

  var headerEle;

  var footerEle;

  var codeEle;

  var head2Ele;

  var starImgObg;

  var chatContent, template;

  var starName = "张信哲", starNickName = "張信哲JeffChang", starID = 1, starImg;

  var cW = 640, cHeigth = 1138, headL = 18, headW = 63, headR = cW - headL - headW,

    padding = 20, fontSize = 23, lingheight = 30, imgTextSpace = 20,

    starTextL = headL + headW + imgTextSpace - 3,

    starTextR = headR - imgTextSpace,

    maxTextW = 405, gY = 0, verticlaSpace = 34, textRadius = 6;

  CanvasRenderingContext2D.prototype.roundRect = function (x, y, w, h, r) {

    if (w < 2 * r) r = w / 2;

    if (h < 2 * r) r = h / 2;

    this.beginPath();

    this.moveTo(x + r, y);

    this.arcTo(x + w, y, x + w, y + h, r);

    this.arcTo(x + w, y + h, x, y + h, r);

    this.arcTo(x, y + h, x, y, r);

    this.arcTo(x, y, x + w, y, r);

    this.closePath();

    return this;

  }

  export default {

    components: {

      VHeader

    },

    data() {

      return {

        name: '',

        itemList: [],

        recommendList: [],

        Alist: [{

          name: '影视大咖'

        }, {

          name: '女明星'

        }, {

          name: '男明星'

        }, {

          name: '商业大亨'

        }],

        starName: '',

        starNickName: '',

        starID: '',

        starImgObg: '',

        chatContent: '',

        template: '',

        ShowAgain: false

      }

    },

    created() {

      this.getData();

    },

    mounted() {

      let self = this;

      headerEle = document.getElementById('headerImg');

      footerEle = document.getElementById('footerImg');

      codeEle = document.getElementById('codeImg');

      head2Ele = document.getElementById('head2Img');

      CanvasRenderingContext2D.prototype.drawStarText = function (x, y, r, text, translate) {

        self.drawStarImg(this, y);

        console.log('star')

        this.font = "24px Helvetica";

        var hastrans = false;

        var wordCnt = com.isChineseChar(text) ? 32 : 33;

        console.log(wordCnt)

        var textArr = self.getText2Arr(this, text, wordCnt);

        var h = headW + lingheight * (textArr.length - 1);

        var w = (textArr.length > 1) ? maxTextW : (this.measureText(textArr[0]).width + 2 * padding);

        if (translate) {

          hastrans = true;

          var transArr = self.getText2Arr(this, translate, 32);

          h = h + lingheight * (transArr.length) + 48;

          if (transArr.length > 1) {

            w = maxTextW;

          }

        }

        gY = y + h + verticlaSpace;

        if (w < 2 * r) r = w / 2;

        if (h < 2 * r) r = h / 2;

        this.save();

        this.beginPath();

        this.moveTo(x + r, y);

        this.arcTo(x + w, y, x + w, y + h, r);

        this.arcTo(x + w, y + h, x, y + h, r);

        this.arcTo(x, y + h, x, y, r);

        this.lineTo(x, y + 31 + 7);

        this.lineTo(x - 10, y + 31);

        this.lineTo(x, y + 31 - 7);

        this.arcTo(x, y, x + w, y, r);

        this.closePath();

        this.strokeStyle = '#d3d3d3';

        this.lineWidth = 2;

        this.stroke();

        this.fillStyle = "#fff";

        this.fill();

        this.textBaseline = 'top';

        this.textAlign = 'left';

        this.fillStyle = '#000';

        self.writeTextArr(this, textArr, lingheight, x + padding, y + padding);

        //writeMulLineText(this, text, 32, 30, x + padding, y+padding);

        //this.fillText(text, x + padding, y+padding);

        if (hastrans) {

          this.beginPath();

          var lineY = y + padding * 2 + textArr.length * lingheight;

          this.moveTo(x + padding, lineY);

          this.lineTo(x + w - padding, lineY);

          this.strokeStyle = "#ddd";

          this.stroke();

          self.writeTextArr(this, transArr, lingheight, x + padding, lineY + 20);

          gY = gY - verticlaSpace;

          this.transFlag(x, gY + 8, textRadius);

        }

        this.restore();

        return this;

      }

      CanvasRenderingContext2D.prototype.drawSelfText = function (x, y, r, text) {

        self.drawSelfImg(this, y);

        this.font = "24px Helvetica"; // Arial

        var wordCnt = com.isChineseChar(text) ? 32 : 33;

        var textArr = self.getText2Arr(this, text, wordCnt);

        var h = headW + lingheight * (textArr.length - 1);

        var w = (textArr.length > 1) ? maxTextW : (this.measureText(textArr[0]).width + 2 * padding);

        x = x - w;

        gY = y + h + verticlaSpace;

        if (w < 2 * r) r = w / 2;

        if (h < 2 * r) r = h / 2;

        this.save();

        this.beginPath();

        this.moveTo(x + r, y);

        this.arcTo(x + w, y, x + w, y + h, r);

        this.lineTo(x + w, y + 31 + 7);

        this.lineTo(x + w + 10, y + 31);

        this.lineTo(x + w, y + 31 - 7);

        this.arcTo(x + w, y + h, x, y + h, r);

        this.arcTo(x, y + h, x, y, r);

        this.arcTo(x, y, x + w, y, r);

        this.closePath();

        this.strokeStyle = '#8bdf49';

        this.lineWidth = 2;

        this.stroke();

        this.fillStyle = "#a0e75a";

        this.fill();

        this.textBaseline = 'top';

        this.textAlign = 'left';

        this.fillStyle = '#000';

        self.writeTextArr(this, textArr, lingheight, x + padding, y + padding);

        //writeMulLineText(this, text, 32, 30, x + padding, y+padding);

        //this.fillText(text, x + padding, y+padding);

        this.restore();

        return this;

      }

      CanvasRenderingContext2D.prototype.drawHelloText = function (x, y, r, text) {

        this.save();

        this.font = "18px Helvetica";

        var h = 32;

        var w = this.measureText(text).width + 2 * padding;

        x = x - w / 2;

        gY = y + h + 22;

        if (w < 2 * r) r = w / 2;

        if (h < 2 * r) r = h / 2;

        this.beginPath();

        this.moveTo(x + r, y);

        this.arcTo(x + w, y, x + w, y + h, r);

        this.arcTo(x + w, y + h, x, y + h, r);

        this.arcTo(x, y + h, x, y, r);

        this.arcTo(x, y, x + w, y, r);

        this.closePath();

        this.fillStyle = "#cecece";

        this.fill();

        this.textBaseline = 'middle';

        this.textAlign = 'center';

        this.fillStyle = '#fff';

        this.fillText(text, cW / 2, y + h / 2);

        this.restore();

        return this;

      }

      CanvasRenderingContext2D.prototype.transFlag = function (x, y, r, text) {

        this.save();

        this.font = "18px Helvetica";

        var h = 32;

        text = '√ 已翻译';

        var transpading = 10;

        var w = this.measureText(text).width + 2 * transpading;

        gY = y + h + verticlaSpace;

        if (w < 2 * r) r = w / 2;

        if (h < 2 * r) r = h / 2;

        this.beginPath();

        this.moveTo(x + r, y);

        this.arcTo(x + w, y, x + w, y + h, r);

        this.arcTo(x + w, y + h, x, y + h, r);

        this.arcTo(x, y + h, x, y, r);

        this.arcTo(x, y, x + w, y, r);

        this.closePath();

        this.fillStyle = "#cecece";

        this.fill();

        this.textBaseline = 'middle';

        this.textAlign = 'left';

        this.fillStyle = '#fff';

        this.fillText(text, x + transpading, y + h / 2);

        this.restore();

        return this;

      }

      CanvasRenderingContext2D.prototype.drawQrcode = function (img, x, y) {

        self.drawStarImg(this, y);

        var h = 200 + padding;

        var w = 200 + padding;

        var r = textRadius;

        if (w < 2 * r) r = w / 2;

        if (h < 2 * r) r = h / 2;

        this.save();

        this.beginPath();

        this.moveTo(x + r, y);

        this.arcTo(x + w, y, x + w, y + h, r);

        this.arcTo(x + w, y + h, x, y + h, r);

        this.arcTo(x, y + h, x, y, r);

        this.lineTo(x, y + 31 + 7);

        this.lineTo(x - 10, y + 31);

        this.lineTo(x, y + 31 - 7);

        this.arcTo(x, y, x + w, y, r);

        this.closePath();

        this.strokeStyle = '#d3d3d3';

        this.lineWidth = 2;

        this.stroke();

        this.fillStyle = "#fff";

        this.fill();

        this.drawImage(img, x + 10, y + 10, 200, 200)

        gY = y + h + verticlaSpace;

      }

    },

    methods: {

      getData(ev) {

        let self = this;

        // 默认页面加载的数据

        if (ev == undefined) {

          self.$http.get('https://h5.tangdaoya.com/game/wechat/getstarbytype/影视大咖')

            .then(res => {

              let result = res.data.list;

//              self.itemList = result;

              self.recommendList = result;

            }).catch(error => {

            Toast('网络出现错误，请稍后再试');

          });

        } else {

          // 传递参数请求接口

          self.$http.get('https://h5.tangdaoya.com/game/wechat/getstarbytype/' + ev)

            .then(res => {

              console.log(res.data.list);

              let result = res.data.list;

              self.itemList = result;

            }).catch(error => {

            Toast('网络出现错误，请稍后再试');

          });

        }

      },

      drawResult(a, b, c, e) {

        let self = this;

        self.starName = a;

        self.starNickName = b;

        self.starID = c;

        starImgObg = e.target;

        Toast('正在生成中~');

        self.getChatContent();

      },

      gameStart() {

        let self = this;

        var canvas = document.createElement('canvas');

        canvas.width = cW;

        canvas.height = cHeigth;

        var context = canvas.getContext('2d');

        context.fillStyle = '#ebebeb';

        context.fillRect(0, 0, cW, cHeigth);

        context.drawImage(headerEle, 0, 0);

        self.writeHeader(context, starName);

        gY = 115;

        if (template == 1) {

          context.drawHelloText(cW / 2, gY, textRadius, com.getTime(true));

        } else {

          context.drawHelloText(cW / 2, gY, textRadius, com.getDateTime());

        }

        for (var i = 0; i < chatContent.length; i++) {

          var contentTemp = chatContent[i]['content'];

          if (com.is_weixn()) {

            contentTemp = contentTemp.replace(/xxx/ig, nickName);

          } else {

            contentTemp = contentTemp.replace(/是xxx吗？/ig, '');

          }

          if (chatContent[i] && chatContent[i]['star']) {

            if (chatContent[i]['isImg']) {

              // context.drawQrcode(codeEle, starTextL, gY);

              context.drawQrcode(codeEle, starTextL, gY);

            } else {

              context.drawStarText(starTextL, gY, textRadius, contentTemp, chatContent[i]['translate']);

              if (i == 0 && template == 2) {

                self.drawHello(context, starNickName);

                gY = gY + 12;

              }

            }

          } else {

            context.drawSelfText(starTextR, gY, textRadius, contentTemp);

          }

        }

        // context.drawImage(footerEle, 0, cHeigth - 78, 640, 78);

        context.drawImage(footerEle, 0, cHeigth - 78, 640, 78);

        console.log('canvas'+canvas);

        console.log(canvas);

          console.log(canvas.toDataURL("image/png", 0.6));

        self.saveImage(canvas.toDataURL("image/png", 0.6))

      },

      saveImage(data) {

        $('#targetImg').attr('src', data);

      },

      getChatContent() {

        let self = this;

        var server = "https://h5.tangdaoya.com/game/wechat/getChatContent/" + 2;//this.starID

        self.$http.get(server).then(res => {

          let result = res.data;

          this.chatContent = result.chatContents;

          chatContent = this.chatContent;

          this.template = result['template'];

          if (result['changeContent'] == 0) {

            //Selector('.commonbtn-playAgain').style.display = "none";

            this.ShowAgain = false;

          } else if (result['changeContent'] == 1) {

            this.ShowAgain = true;

          }

          self.gameStart();

        }).catch(error => {

          //Toast('网络出现错误，请稍后再试');

        });

      },

      changeContent() {

        $('#result').attr('src', '');

        $('#page2').removeClass('active');

        $('#page3').addClass('active');

      },

      drawStarImg(ctx, y) {

        ctx.drawImage(starImgObg, headL, y, headW, headW);

      },

      writeHeader(ctx, name) {

        var y = 67;

        ctx.save();

        ctx.textBaseline = 'middle';

        ctx.textAlign = 'center';

        ctx.fillStyle = '#fff';

        ctx.font = "19px Arial";

        ctx.fillText(com.getTime(), cW / 2, 18);

        ctx.font = "29px Arial";

        ctx.fillText(name, cW / 2, y);

        ctx.restore();

      },

      drawSelfImg(ctx, y) {

        //ctx.drawImage(selfImgObg, headR, y, headW, headW)    ;

        // ctx.drawImage(head2Ele, headR, y, headW, headW);

        ctx.drawImage(head2Ele, headR, y, headW, headW);

      },

      getText2Arr(ctx, text, rw) {

        var textArr = [];

        for (var i = 0; com.getTrueLength(text) > 0; i++) {

          var tl = com.cutString(text, rw);

          if (ctx.measureText(text.substr(0, tl)).width < 350)

            tl = tl + 1;

          for (var j = 0; j < tl; j++) {

            var temp = text.substr(tl, 1);

            if (temp == " " || temp.charCodeAt(0) > 128 || temp == "") {

              break;

            }

            else {

              tl = tl - 1;

            }

          }

          //ctx.fillText(text.substr(0, tl).replace(/^\s+|\s+$/, ""), offsetX , i * lineheight + offsetY);

          textArr.push(text.substr(0, tl));

          text = text.substr(tl);

        }

        return textArr;

      },

      writeTextArr(ctx, textArr, lineheight, offsetX, offsetY) {

        for (var i = 0; i < textArr.length; i++) {

          ctx.fillText(textArr[i].replace(/^\s+|\s+$/, ""), offsetX, i * lineheight + offsetY);

        }

      }

    }

  }

</script>

<style lang="less" rel="stylesheet/less" scoped>

  .s-content {

    margin-top: 50px;

    height: 1000px;

  }

  .s-recommend {

    height: 30px;

    line-height: 2em;

    border-bottom: 1px solid #F0F0F7;

    .span-1 {

      background-color: #FF4852;

      color: white;

      margin-left: 10px;

    }

  }

  .s-recommend-people {

    width: 100%;

    height: 100px;

    margin-top: 5px;

    border-bottom: 3px solid #F0F0F7;

    ul {

      width: 100%;

      height: 100px;

      margin: 0 auto;

      li {

        position: relative;

        display: inline-block;

        list-style: none;

        width: 25%;

        height: 80px;

        margin-top: 10px;

        margin-left: 6%;

        .s-img {

          width: 50px;

          height: 50px;

          margin: 0 auto;

          img {

            width: 50px;

            height: 50px;

            border-radius: 10px;

          }

        }

        .s-title {

          width: 50px;

          height: 20px;

          border: 1px solid balck;

          margin: 0 auto;

          text-align: center;

          margin-top: 5px;

          font-size: 0.8em;

        }

      }

    }

  }

  .s-category {

    height: 30px;

    line-height: 2em;

    border-bottom: 1px solid #F0F0F7;

    .span-2 {

      background-color: #139F00;

      color: white;

      margin-left: 10px;

    }

  }

  .s-category-a {

    height: 50px;

    margin-top: 5px;

    a {

      border: 1px solid #9b9b9b;

      display: inline-block;

      border-radius: 10px;

      padding: .15rem 0.31rem;

      display: inline-block;

      margin-top: 12px;

      height: 25px;

      line-height: 1.6em;

      margin-left: 10px;

    }

  }

  .s-category-list {

    margin-top: 10px;

    height: 700px;

    ul {

      width: 100%;

      height: 100%;

      li {

        border-bottom: 1px solid #F0F0F7;

        width: 100%;

        height: 80px;

        margin-top: 10px;

        .s-a-1 {

          float: left;

          width: 78%;

          height: 80px;

          .s-a-img {

            float: left;

            width: 60px;

            height: 60px;

            background-color: gray;

            margin-top: 10px;

            margin-left: 10px;

            border-radius: 10px;

            img {

              width: 60px;

              height: 60px;

              border-radius: 10px;

            }

          }

          .s-a-title {

            float: left;

            height: 60px;

            margin-top: 10px;

            margin-left: 5px;

            .s-a-title-name {

              margin-top: 10px;

              color: black;

              font-size: 0.8em;

            }

            .s-a-title-play {

              margin-top: 10px;

              .s-people {

                font-size: 0.8em;

              }

              .icon-star {

                font-size: 0.9em;

              }

            }

          }

        }

        .s-a-2 {

          float: right;

          width: 60px;

          height: 27px;

          border: 1px solid #EFB31D;

          margin-top: 25px;

          margin-right: 20px;

          border-radius: 5px;

          line-height: 1.8em;

          text-align: center;

          color: #EFB31D;

          .icon-more {

            display: inline-block;

            color: #EFB31D;

          }

        }

      }

    }

  }

  /* 制作页样式*/

  .box {

    display: none;

    .loading {

      position: relative;

      width: 75px;

      margin-top: 40%;

    }

    .loading-text {

      position: relative;

      text-align: center;

      color: #FF4303;

      margin-top: 20px auto;

      font-family: "微软雅黑";

      letter-spacing: 1px;

    }

  }

  .commonbtn-share {

    display: inline-block;

    margin: 0.5%;

    padding: 0.5em 0em;

    font-size: 16px;

    color: white;

    background-color: #FF4303;

    border-radius: 40px;

    width: 35%;

    box-sizing: border-box;

    -webkit-box-sizing: border-box;

  }

  .active .loading {

    -webkit-animation: roting 1s linner infinite;

  }

</style>

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