vue 图片放大、缩小、旋转、滚轮操作图片放大缩小

组件

<template>
  
  <div class="imgCont"
       ref="imgCont"
       @mousewheel.prevent="rollImg($event)"
       >
    <div class="iconBtn">
      <span class="refreshBtn">
        <i class="el-icon-zoom-out"
           @click.stop="outImg('out')">i>
        <i class="el-icon-zoom-in"
           @click.stop="outImg('in')">i>

        <i class="el-image-viewer__actions__divider">i>
          <i :class="mode.icon" @click="toggleMode">i>
          <i class="el-image-viewer__actions__divider">i>
        <i @click.stop="rotate('left')"
           class="el-icon-refresh-left">i>
        <i @click.stop="rotate('right')"
           class="el-icon-refresh-right right">i>
        <slot name="addIcon">slot>
      span>
    div>
    <img class="bigImage"
         ref="imgDiv"
         @mousedown.stop.prevent="moveImg($event)"
         id="img"
         :src="url" />
  div>
template>

<script>
const Mode = {
  CONTAIN: {
    name: "contain",
    icon: "el-icon-full-screen"
  },
  ORIGINAL: {
    name: "original",
    icon: "el-icon-c-scale-to-original"
  }
};
export default {
  name: 'imgDeal',
  props: {
    url: {},
  },
  components: {},
  data () {
    return {
      mode: Mode.CONTAIN,
      // 图片参数
      params: {
        zoomVal: 1,
        left: 0,
        top: 0,
        currentX: 0,
        currentY: 0,
      },
      deg: 0,
    };
  },
  computed: {

  },
  watch: {

  },
  created () {
    this.restImg();
  },
  mounted () {

  },
  methods: {
    //1:1自适应
    toggleMode () {
      const modeNames = Object.keys(Mode);
      const modeValues = Object.values(Mode);
      const index = modeValues.indexOf(this.mode);
      const nextIndex = (index + 1) % modeNames.length;
      this.mode = Mode[modeNames[nextIndex]];
      if (this.mode.name == 'original') {
        this.originalFunc();
      } else {
        this.restImg();
      }
    },
    // mode==original 默认放大图片
    originalFunc () {
      this.params.zoomVal = 2;
      this.restFunc();
    },
    // 初始化数据,重置数据
    restImg () {
      this.params.zoomVal = 1;
      this.restFunc();
      this.mode = Mode['CONTAIN'];
    },
    restFunc () {
      this.params.left = 0;
      this.params.top = 0;
      this.params.currentX = 0;
      this.params.currentY = 0;
      this.deg = 0;
      if (this.$refs.imgDiv) {
        let img = this.$refs.imgDiv;
        img.style.transform = `translate(-50%, -50%) scale(${this.params.zoomVal}) rotate(${this.deg}deg)`;
        img.style.left = '50%';
        img.style.top = '50%';
      }
    },
    // 图片滚动放大
    rollImg (event) {
      this.params.zoomVal += event.wheelDelta / 1200;
      this.rollFunc()
    },
    outImg (flag) {
      if (flag == 'out') {
        this.params.zoomVal -= 0.2;
      } else {
        this.params.zoomVal += 0.2;
      }
      this.rollFunc()
    },
    rollFunc () {
      let e = this.$refs.imgDiv;
      if (this.params.zoomVal >= 0.2) {
        e.style.transform = `translate(-50%, -50%) scale(${this.params.zoomVal}) rotate(${this.deg}deg)`;
      } else {
        this.params.zoomVal = 0.2;
        e.style.transform = `translate(-50%, -50%) scale(${this.params.zoomVal}) rotate(${this.deg}deg)`;
        return false;
      }
    },
    
    // 图片旋转
    rotate (type) {
      let res = this.$refs.imgDiv;
      this.deg = type == 'right' ? this.deg + 90 : this.deg - 90
      res.style.transform = `translate(-50%, -50%) scale(${this.params.zoomVal}) rotate(${this.deg}deg)`
    },
    // 图片移动
    moveImg (e) {
      // 获得该时间触发的时间戳
      let mouseDate = new Date().getTime();
      this.$emit('getMouseDate',mouseDate)
      e.preventDefault()
      // 获取元素
      let imgWrap = this.$refs.imgCont
      let img = this.$refs.imgDiv
      let x = e.pageX - img.offsetLeft
      let y = e.pageY - img.offsetTop
      // 添加鼠标移动事件
      imgWrap.addEventListener('mousemove', move)
      function move (e) {
        img.style.left = e.pageX - x + 'px'
        img.style.top = e.pageY - y + 'px'
      }
      // 添加鼠标抬起事件，鼠标抬起，将事件移除
      img.addEventListener('mouseup', () => {
        imgWrap.removeEventListener('mousemove', move)
      })
      // 鼠标离开父级元素，把事件移除
      imgWrap.addEventListener('mouseout', () => {
        imgWrap.removeEventListener('mousemove', move)
      })
    },
  },
};
script>

<style scoped lang="scss">
.imgCont {
  text-align: center;
  vertical-align: middle;
  position: relative;
  overflow: hidden;
  width: 100%;
  height: 100%;
  .iconBtn {
    position: absolute;
    left: 0;
    bottom: 0;
    height: 35px;
    line-height: 35px;
    background-color: rgba(0, 0, 0, 0.2);
    color: #fff;
    width: 100%;
    z-index: 100;
    font-size: 20px;
    .refreshBtn {
      i {
        cursor: pointer;
        margin: 0 10px;
      }
    }
  }
  .bigImage {
    max-width: 100%;
    max-height: 100%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    cursor: move;
    margin: 0 auto;
  }
}
style>

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组件使用

import ImgDeal from "@/components/imgDeal.vue";
components: {
    ImgDeal 
  },
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<ImgDeal ref="imgDeal" :url="imgUrl">ImgDeal>
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