vue2基于 vue-cropper插件对图片裁剪

<template>
  <div id="app">
    <div class="model" v-show="model" @click="model = false">
      <div class="model-show">
        <img :src="modelSrc" alt />
      </div>
    </div>
    <p>例子</p>
    <div class="cut">
      <vue-cropper
        ref="cropper"
        :img="option.img"
        :output-size="option.size"
        :output-type="option.outputType"
        :info="true"
        :full="option.full"
        :fixed="fixed"
        :fixed-number="fixedNumber"
        :can-move="option.canMove"
        :can-move-box="option.canMoveBox"
        :fixed-box="option.fixedBox"
        :original="option.original"
        :auto-crop="option.autoCrop"
        :auto-crop-width="option.autoCropWidth"
        :auto-crop-height="option.autoCropHeight"
        :center-box="option.centerBox"
        @real-time="realTime"
        :high="option.high"
        @img-load="imgLoad"
        mode="cover"
        :max-img-size="option.max"
        @crop-moving="cropMoving"
      ></vue-cropper>
    </div>
    <div
      class="show-preview"
      :style="{'width': previews.w + 'px', 'height': previews.h + 'px',  'overflow': 'hidden', 'margin': '5px'}"
    >
      <div :style="previews.div">
        <img :src="previews.url" :style="previews.img" />
      </div>
    </div>
    <div class="test-button">
      <button @click="changeImg" class="btn">changeImg</button>
      <label class="btn" for="uploads">upload</label>
      <input
        type="file"
        id="uploads"
        style="position:absolute; clip:rect(0 0 0 0);"
        accept="image/png, image/jpeg, image/gif, image/jpg"
        @change="uploadImg($event, 1)"
      />
      <button @click="startCrop" v-if="!crap" class="btn">start</button>
      <button @click="stopCrop" v-else class="btn">stop</button>
      <button @click="clearCrop" class="btn">clear</button>
      <button @click="refreshCrop" class="btn">refresh</button>
      <button @click="changeScale(1)" class="btn">+</button>
      <button @click="changeScale(-1)" class="btn">-</button>
      <button @click="rotateLeft" class="btn">rotateLeft</button>
      <button @click="rotateRight" class="btn">rotateRight</button>
      <button @click="finish('base64')" class="btn">preview(base64)</button>
      <button @click="finish('blob')" class="btn">preview(blob)</button>
      <button @click="down('base64')" class="btn">download(base64)</button>
      <a @click="down('base64')" class="btn">download(base64)</a>
      <a @click="down('blob')" class="btn">download(blob)</a>
      <a @click="() => option.img = ''" class="btn">清除图片</a>
      <div style="display:block; width: 100%;">
        <label class="c-item">
          <span>上传图片是否显示原始宽高 (针对大图 可以铺满)</span>
          <input type="checkbox" v-model="option.original" />
          <span>original: {{ option.original}}</span>
        </label>
        <label class="c-item">
          <span>能否拖动图片</span>
          <input type="checkbox" v-model="option.canMove" />
        </label>
        <label class="c-item">
          <span>能否拖动截图框</span>
          <input type="checkbox" v-model="option.canMoveBox" />
          <span>canMoveBox: {{ option.canMoveBox}}</span>
        </label>
        <label class="c-item">
          <span>截图框固定大小</span>
          <input type="checkbox" v-model="option.fixedBox" />
          <span>fixedBox: {{ option.fixedBox}}</span>
        </label>
        <label class="c-item">
          <span>是否输出原图比例的截图</span>
          <input type="checkbox" v-model="option.full" />
          <span>full: {{ option.full}}</span>
        </label>
        <label class="c-item">
          <span>是否自动生成截图框</span>
          <input type="checkbox" v-model="option.autoCrop" />
          <span>autoCrop: {{ option.autoCrop}}</span>
        </label>
        <label class="c-item">
          <span>是否根据dpr生成适合屏幕的高清图片</span>
          <input type="checkbox" v-model="option.high" />
          <span>high: {{ option.high}}</span>
        </label>
        <label class="c-item">
          <span>截图框是否限制在图片里(只有在自动生成截图框时才能生效)</span>
          <input type="checkbox" v-model="option.centerBox" />
          <span>centerBox: {{ option.centerBox}}</span>
        </label>
        <label class="c-item">
          <p>输出图片格式</p>
          <label>
            jpg
            <input type="radio" name="type" value="jpeg" v-model="option.outputType" />
          </label>
          <label>
            png
            <input type="radio" name="type" value="png" v-model="option.outputType" />
          </label>
          <label>
            webp
            <input type="radio" name="type" value="webp" v-model="option.outputType" />
          </label>
        </label>
      </div>
    </div>
  </div>
  <!-- <script src="https://vuejs.org/js/vue.min.js"></script> -->
  <!-- <script src="https://cdn.bootcss.com/vue/2.6.11/vue.js"></script> -->
  <!-- <script src="https://cdn.jsdelivr.net/npm/vue-cropper@0.5.5/dist/index.min.js"></script> -->
</template>

<script>
import { VueCropper } from 'vue-cropper'
export default {
  name: "CropperImage",
  components: {
    VueCropper
  },
  props: ['Name'],
  data () {
    return {
      model: false,
      modelSrc: '',
      crap: false,
      previews: {},
      lists: [
        {
          img: 'https://avatars2.githubusercontent.com/u/15681693?s=460&v=4'
        }
      ],
      option: {
        img: 'https://avatars2.githubusercontent.com/u/15681693?s=460&v=4',
        size: 1,
        full: false,
        outputType: 'png',
        canMove: true,
        fixedBox: false,
        original: false,
        canMoveBox: true,
        autoCrop: true,
        // 只有自动截图开启 宽度高度才生效
        autoCropWidth: 750,
        autoCropHeight: 340,
        centerBox: true,
        high: true,
        max: 99999
      },
      show: true,
      fixed: false,
      fixedNumber: [16, 9]
    }
  },
  methods: {
    changeImg () {
      this.option.img = this.lists[~~(Math.random() * this.lists.length)].img
    },
    startCrop () {
      // start
      this.crap = true
      this.$refs.cropper.startCrop()
    },
    stopCrop () {
      //  stop
      this.crap = false
      this.$refs.cropper.stopCrop()
    },
    clearCrop () {
      // clear
      this.$refs.cropper.clearCrop()
    },
    refreshCrop () {
      // clear
      this.$refs.cropper.refresh()
    },
    changeScale (num) {
      num = num || 1
      this.$refs.cropper.changeScale(num)
    },
    rotateLeft () {
      this.$refs.cropper.rotateLeft()
    },
    rotateRight () {
      this.$refs.cropper.rotateRight()
    },
    finish (type) {
      console.log(type)
      // 输出
      // var test = window.open('about:blank')
      // test.document.body.innerHTML = '图片生成中..'
      if (type === 'blob') {
        this.$refs.cropper.getCropBlob((data) => {
          console.log(data)
          var img = window.URL.createObjectURL(data)
          this.model = true
          this.modelSrc = img
        })
      } else {
        this.$refs.cropper.getCropData((data) => {
          this.model = true
          this.modelSrc = data
        })
      }
    },
    // 实时预览函数
    realTime (data) {
      console.log('实时预览函数')
      this.previews = data
      console.log(data)
    },
    finish2 (type) {
      console.log(type)
      this.$refs.cropper2.getCropData((data) => {
        this.model = true
        this.modelSrc = data
      })
    },
    finish3 (type) {
      console.log(type)

      this.$refs.cropper3.getCropData((data) => {
        this.model = true
        this.modelSrc = data
      })
    },
    down (type) {
      // event.preventDefault()
      var aLink = document.createElement('a')
      aLink.download = 'demo'
      // 输出
      if (type === 'blob') {
        this.$refs.cropper.getCropBlob((data) => {
          this.downImg = window.URL.createObjectURL(data)
          aLink.href = window.URL.createObjectURL(data)
          aLink.click()
        })
      } else {
        this.$refs.cropper.getCropData((data) => {
          this.downImg = data
          aLink.href = data
          aLink.click()
        })
      }
    },

    uploadImg (e, num) {
      //上传图片
      // this.option.img
      var file = e.target.files[0]
      if (!/\.(gif|jpg|jpeg|png|bmp|GIF|JPG|PNG)$/.test(e.target.value)) {
        alert('图片类型必须是.gif,jpeg,jpg,png,bmp中的一种')
        return false
      }
      var reader = new FileReader()
      reader.onload = (e) => {
        let data
        if (typeof e.target.result === 'object') {
          // 把Array Buffer转化为blob 如果是base64不需要
          data = window.URL.createObjectURL(new Blob([e.target.result]))
        } else {
          data = e.target.result
        }
        if (num === 1) {
          this.option.img = data
        } else if (num === 2) {
          this.example2.img = data
        }
      }
      // 转化为base64
      // reader.readAsDataURL(file)
      // 转化为blob
      reader.readAsArrayBuffer(file)
    },
    imgLoad (msg) {
      console.log(msg)
    },
    cropMoving (data) {
      console.log(data, '截图框当前坐标')
    }
  },
}
</script>

<style scoped >
* {
  margin: 0;
  padding: 0;
}

.cut {
  width: 500px;
  height: 500px;
  margin: 30px auto;
}

.c-item {
  max-width: 800px;
  margin: 10px auto;
  margin-top: 20px;
}

.content {
  margin: auto;
  max-width: 1200px;
  margin-bottom: 100px;
}

.test-button {
  display: flex;
  flex-wrap: wrap;
  align-content: center;
  justify-content: center;
}

.btn {
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  background: #fff;
  border: 1px solid #c0ccda;
  color: #1f2d3d;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  margin: 20px 10px 0px 0px;
  padding: 9px 15px;
  font-size: 14px;
  border-radius: 4px;
  color: #fff;
  background-color: #50bfff;
  border-color: #50bfff;
  transition: all 0.2s ease;
  text-decoration: none;
  user-select: none;
}

.des {
  line-height: 30px;
}

code.language-html {
  padding: 10px 20px;
  margin: 10px 0px;
  display: block;
  background-color: #333;
  color: #fff;
  overflow-x: auto;
  font-family: Consolas, Monaco, Droid, Sans, Mono, Source, Code, Pro, Menlo,
    Lucida, Sans, Type, Writer, Ubuntu, Mono;
  border-radius: 5px;
  white-space: pre;
}

.show-info {
  margin-bottom: 50px;
}

.show-info h2 {
  line-height: 50px;
}

/*.title, .title:hover, .title-focus, .title:visited {
        color: black;
      }*/

.title {
  display: block;
  text-decoration: none;
  text-align: center;
  line-height: 1.5;
  margin: 20px 0px;
  background-image: -webkit-linear-gradient(
    left,
    #3498db,
    #f47920 10%,
    #d71345 20%,
    #f7acbc 30%,
    #ffd400 40%,
    #3498db 50%,
    #f47920 60%,
    #d71345 70%,
    #f7acbc 80%,
    #ffd400 90%,
    #3498db
  );
  color: transparent;
  -webkit-background-clip: text;
  background-size: 200% 100%;
  animation: slide 5s infinite linear;
  font-size: 40px;
}

.test {
  height: 500px;
}

.model {
  position: fixed;
  z-index: 10;
  width: 100vw;
  height: 100vh;
  overflow: auto;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.8);
}

.model-show {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
}

.model img {
  display: block;
  margin: auto;
  max-width: 80%;
  user-select: none;
  background-position: 0px 0px, 10px 10px;
  background-size: 20px 20px;
  background-image: linear-gradient(
      45deg,
      #eee 25%,
      transparent 25%,
      transparent 75%,
      #eee 75%,
      #eee 100%
    ),
    linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
}

.c-item {
  display: block;
  user-select: none;
}

@keyframes slide {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: -100% 0;
  }
}
</style>

<template>
  <div class="cropper-content">
    <div class="cropper-box">
      <div class="cropper">
        <vue-cropper
          ref="cropper"
          :img="option.img"
          :output-size="option.size"
          :output-type="option.outputType"
          :info="true"
          :full="option.full"
          :fixed="fixed"
          :fixed-number="fixedNumber"
          :can-move="option.canMove"
          :can-move-box="option.canMoveBox"
          :fixed-box="option.fixedBox"
          :original="option.original"
          :auto-crop="option.autoCrop"
          :auto-crop-width="option.autoCropWidth"
          :auto-crop-height="option.autoCropHeight"
          :center-box="option.centerBox"
          @real-time="realTime"
          :high="option.high"
          @img-load="imgLoad"
          mode="cover"
          :max-img-size="option.max"
          @crop-moving="cropMoving"
        ></vue-cropper>
      </div>
      <!--底部操作工具按钮-->
      <div class="footer-btn">
        <div class="scope-btn">
          <!-- <label class="btn" for="uploads">选择封面</label> -->
          <!-- <input
            type="file"
            id="uploads"
            style="position:absolute; clip:rect(0 0 0 0);"
            accept="image/png, image/jpeg, image/gif, image/jpg"
            @change="selectImg($event)"
          />-->
          <el-button
            size="mini"
            type="danger"
            plain
            icon="el-icon-zoom-in"
            @click="changeScale(1)"
          >放大</el-button>
          <el-button
            size="mini"
            type="danger"
            plain
            icon="el-icon-zoom-out"
            @click="changeScale(-1)"
          >缩小</el-button>
          <el-button size="mini" type="danger" plain @click="rotateLeft">↺ 左旋转</el-button>
          <el-button size="mini" type="danger" plain @click="rotateRight">↻ 右旋转</el-button>
        </div>
        <div class="upload-btn">
          <el-button size="mini" type="success" @click="uploadImg('blob')">
            确定
            <i class="el-icon-upload"></i>
          </el-button>
          <el-button size="mini" @click="down('base64')" type="primary">图片下载</el-button>
        </div>
      </div>
    </div>

    <!--预览效果图-->
    <div class="show-preview">
      <div :style="previews.div" class="preview">
        <img :src="previews.url" :style="previews.img" />
      </div>
      <label class="c-item">
        <p>图片下载格式:</p>
        <label>
          <input type="radio" name="type" value="jpeg" v-model="option.outputType" />
          jpg
        </label>
        <label>
          <input type="radio" name="type" value="png" v-model="option.outputType" />
          png
        </label>
        <label>
          <input type="radio" name="type" value="webp" v-model="option.outputType" />
          webp
        </label>
      </label>
    </div>
  </div>
</template>

<script>
import { VueCropper } from 'vue-cropper'
import api from "@/service/api"
export default {
  name: "CropperImage",
  components: {
    VueCropper
  },
  props: {
    Name: {
      type: String,
    },
    cropperImage: {
      type: String,
    }
  },
  data () {
    return {
      name: this.Name,
      previews: {},
      option: {
        img: this.cropperImage,             //裁剪图片的地址
        outputSize: 1,       //裁剪生成图片的质量(可选0.1 - 1)
        outputType: 'jpeg',  //裁剪生成图片的格式（jpeg || png || webp）
        info: true,          //图片大小信息
        canScale: true,      //图片是否允许滚轮缩放
        autoCrop: true,      //是否默认生成截图框
        autoCropWidth: 230,  //默认生成截图框宽度
        autoCropHeight: 150, //默认生成截图框高度
        fixed: true,         //是否开启截图框宽高固定比例
        fixedNumber: [1.53, 1], //截图框的宽高比例
        full: false,         //false按原比例裁切图片，不失真
        fixedBox: true,      //固定截图框大小，不允许改变
        canMove: false,      //上传图片是否可以移动
        canMoveBox: true,    //截图框能否拖动
        original: false,     //上传图片按照原始比例渲染
        centerBox: false,    //截图框是否被限制在图片里面
        height: true,        //是否按照设备的dpr 输出等比例图片
        infoTrue: false,     //true为展示真实输出图片宽高，false展示看到的截图框宽高
        maxImgSize: 3000,    //限制图片最大宽度和高度
        enlarge: 1,          //图片根据截图框输出比例倍数
        mode: '230px 150px', //图片默认渲染方式
      },
      fixedNumber: [16, 9],
      fixed: false,
    }
  },
  methods: {
    // 图片下载
    down (type) {
      // event.preventDefault()
      var aLink = document.createElement('a')
      console.log(aLink)   // a 标签
      aLink.download = '子设备图片'  // 名字
      // 输出
      if (type === 'blob') {
        this.$refs.cropper.getCropBlob((data) => {
          this.downImg = window.URL.createObjectURL(data)
          aLink.href = window.URL.createObjectURL(data)
          aLink.click()
        })
      } else {
        this.$refs.cropper.getCropData((data) => {
          this.downImg = data
          aLink.href = data
          aLink.click()
        })
      }
    },
    // 截图框移动
    cropMoving (data) {
      console.log('截图框移动', data)
    },
    //图片移动回调函数
    imgMoving (data) {
      console.log('图片移动', data)
    },
    //初始化函数
    imgLoad (msg) {
      console.log("工具初始化函数=====" + msg)
    },
    //图片缩放
    changeScale (num) {
      num = num || 1
      this.$refs.cropper.changeScale(num)
    },
    //向左旋转
    rotateLeft () {
      this.$refs.cropper.rotateLeft()
    },
    //向右旋转
    rotateRight () {
      this.$refs.cropper.rotateRight()
    },
    //实时预览函数
    realTime (data) {
      console.log('实时预览')
      this.previews = data
    },
    //选择图片
    // selectImg (e) {
    //   let file = e.target.files[0]
    //   if (!/\.(jpg|jpeg|png|JPG|PNG)$/.test(e.target.value)) {
    //     this.$message({
    //       message: '图片类型要求：jpeg、jpg、png',
    //       type: "error"
    //     })
    //     return false
    //   }
    //   //转化为blob
    //   let reader = new FileReader()
    //   reader.onload = (e) => {
    //     let data
    //     if (typeof e.target.result === 'object') {
    //       data = window.URL.createObjectURL(new Blob([e.target.result]))
    //     } else {
    //       data = e.target.result
    //     }
    //     this.option.img = data
    //   }
    //   //转化为base64
    //   reader.readAsDataURL(file)
    // },
    //上传图片
    uploadImg (type) {
      if (type === 'blob') {
        //获取截图的blob数据
        this.$refs.cropper.getCropBlob(async (data) => {
          let formData = new FormData()
          formData.append('file', data, "DX.jpg")
          //调用axios上传
          const res = await api.baseData.uploadFiles(formData)
          // let { data: res } = await _this.$http.post('/api/file/imgUpload', formData)
          if (res.code === 200) {
            this.$message({
              type: "success",
              message: res.msg
            })
            // 把最终的裁剪的图片传过去
            const obj = {
              // name: file.name,
              url: res.url,
            }
            this.$emit('uploadImgSuccess', obj)
            // 通知父组件关闭弹窗
            this.$emit('closeDialog')
          } else {
            this.$message({
              message: '文件服务异常，请联系管理员！',
              type: "error"
            })
          }
        })
      }
    },
  },
  created () {
    console.log('cropperImage')
    this.option.img = this.cropperImage
  },
}
</script>

<style scoped lang="scss">
.btn {
  height: 20px;
  line-height: 0.6;
  cursor: pointer;
  background: #fff;
  border: 1px solid #c0ccda;
  color: #1f2d3d;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  // margin: 20px 10px 0px 0px;
  padding: 9px 15px;
  font-size: 14px;
  border-radius: 4px;
  color: #fff;
  background-color: #50bfff;
  border-color: #50bfff;
  transition: all 0.2s ease;
  text-decoration: none;
  user-select: none;
}
.cropper-content {
  display: flex;
  display: -webkit-flex;
  justify-content: flex-end;
  .cropper-box {
    flex: 1;
    width: 100%;
    .cropper {
      width: auto;
      height: 300px;
    }
  }

  .show-preview {
    flex: 1;
    -webkit-flex: 1;
    display: flex;
    display: -webkit-flex;
    flex-direction: column;
    justify-content: start;
    align-items: center;
    .preview {
      overflow: hidden;
      border: 1px solid #67c23a;
      background: #cccccc;
    }
  }
}
.footer-btn {
  margin-top: 30px;
  display: flex;
  display: -webkit-flex;
  justify-content: flex-end;
  .scope-btn {
    display: flex;
    display: -webkit-flex;
    justify-content: space-between;
    padding-right: 10px;
  }
  .upload-btn {
    flex: 1;
    -webkit-flex: 1;
    display: flex;
    display: -webkit-flex;
    justify-content: center;
  }
  .btn {
    outline: none;
    display: inline-block;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    -webkit-appearance: none;
    text-align: center;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    outline: 0;
    -webkit-transition: 0.1s;
    transition: 0.1s;
    font-weight: 500;
    padding: 8px 15px;
    font-size: 12px;
    border-radius: 3px;
    color: #fff;
    background-color: #409eff;
    border-color: #409eff;
    margin-right: 10px;
  }
}
</style>