vue项目中图片预览旋转功能

最近项目中需要在图片预览时,可以旋转图片预览,在网上找了下,发现有一款功能强大的图片组件:viewerjs. git-hup: https://github.com/fengyuanchen/viewerjs

在git上看了下,有很多功能,不过我的项目只需要做个图片旋转功能,引入这个组件感觉大材小用了,于是自己写了个简易版的,因为我们只是查看而已,没什么要求.如果你需要比较精确的图片旋转功能,可以使用这个viewerjs组件

功能描述: 一个图片预览框,三个操作按钮: 上一张,下一张,旋转; 点击上一张下一张切换图片,点击旋转顺时针旋转图片,每次旋转90°,旋转后记住当前图片的旋转角度,点击上一张下一张再次切换回来时,需要旋转到上一次旋转的角度

代码:这是一个单独的组件,图片数据可以写在props中传值

<template>

  <div class="rotate_contanier">

    <div class="header">

      <span @click="handleImg(1)">上一张</span>

      <span @click="handleImg(2)">下一张</span>

      <span @click="rotate">旋转</span>

    </div>

    <div class="picture_contaner">

      <div class="img_box" ref="rotate">

        <img :src="fileInfo.fileUrl" alt="">

      </div>

    </div>

  </div>

</template>

<script>

export default {

  props: {

  },

  data() {

    return {

      pictureList: [

        {fileUrl: 'http://mp.ofweek.com/Upload/News/Img/member645/201711/17170046839337.jpg'},

        {fileUrl: 'http://img2.imgtn.bdimg.com/it/u=1239081181,1433383585&fm=26&gp=0.jpg'},

        {fileUrl: 'http://img1.imgtn.bdimg.com/it/u=3502008475,4132115356&fm=26&gp=0.jpg'},

        {fileUrl: 'http://img12.360buyimg.com/n5/s450x450_jfs/t9952/98/2269407420/279171/6137fe2f/59f28b2bN6959e086.jpg'},

        {fileUrl: 'http://img2.imgtn.bdimg.com/it/u=2681505513,370839281&fm=26&gp=0.jpg'},

        {fileUrl: 'http://img2.imgtn.bdimg.com/it/u=1153377230,3978893548&fm=26&gp=0.jpg'}

      ],

      fileInfo: {

        fileUrl: '',

        deg: 0

      },

      currentPage: 0

    }

  },

  created() {

    // 设置图片初始旋转角度

    this.pictureList.forEach(item => {

      item.deg = 0

    })

    this.fileInfo = this.pictureList[this.currentPage]

  },

  mounted() {

  },

  methods: {

    handleImg (type) {

      if (type === 1) { // 上一张

        this.currentPage++

        if (this.currentPage >= this.pictureList.length) {

          this.currentPage = 0

        }

      } else { // 下一张

        this.currentPage--

        if (this.currentPage < 0) {

          this.currentPage = this.pictureList.length - 1

        }

      }

      // 获取图片当前信息

      this.fileInfo = this.pictureList[this.currentPage]

      this.$refs.rotate.style.transform = `rotate(${this.fileInfo.deg}deg)`

    },

    // 旋转图片

    rotate () {

      this.fileInfo = this.pictureList[this.currentPage]

      this.fileInfo.deg += 90

      if (this.fileInfo.deg >= 360) {

        this.fileInfo.deg = 0

      }

      this.$refs.rotate.style.transform = `rotate(${this.fileInfo.deg}deg)`

    }

  }

}

</script>

<style>

.rotate_contanier {

  display: flex;

  flex-direction: column;

  padding: 20px;

  background-color: #909399;

  width: 600px;

  height: 670px;

}

.header {

  height: 50px;

  margin-bottom: 10px;

  text-align: center;

  background-color: #fff;

  padding-top: 20px;

}

.header span {

  padding: 5px 8px;

  color: #fff;

  background-color: #409eff;

  border-radius: 4px;

  margin-right: 5px;

  cursor: pointer;

}

.picture_contaner {

  height: 600px;

  width: 100%;

  background-color: #fff;

  padding: 10px;

  box-sizing: border-box;

}

.picture_contaner .img_box {

  width: 100%;

  height: 100%;

  position: relative;

}

.picture_contaner .img_box img {

  max-width: 100%;

  max-height: 100%;

  position: absolute;

  top: 0;

  left: 0;

  right: 0;

  bottom: 0;

  margin: auto;

}

</style>