How to use Vue to rotate images counterclockwise and clockwise?

How to use Vue to rotate images counterclockwise and clockwise?

Vue is a popular JavaScript framework that is widely used in front-end development. During the development process, we often encounter situations where we need to rotate pictures. This article will use Vue to implement the function of rotating pictures counterclockwise and clockwise.

First, in the Vue project, you need to import relevant libraries and components. You can use the third-party library vue-img-rotate to implement the image rotation function. This library can realize image rotation through simple calls, without requiring developers to write their own rotation algorithms.

<template>
  <div class="image-container">
    <img  src="/static/imghw/default1.png"  data-src="image"  class="lazy"  ref="img" : / alt="How to use Vue to rotate images counterclockwise and clockwise?" >
  </div>
  <button @click="rotateLeft">逆时针旋转</button>
  <button @click="rotateRight">顺时针旋转</button>
</template>

<script>
import imgRotate from 'vue-img-rotate';

export default {
  data() {
    return {
      image: 'path/to/image.jpg',
      angle: 0
    };
  },
  methods: {
    rotateLeft() {
      this.angle -= 90;
    },
    rotateRight() {
      this.angle += 90;
    }
  },
  computed: {
    rotationStyle() {
      return {
        transform: `rotate(${this.angle}deg)`
      }
    }
  },
  components: {
    imgRotate
  }
}
</script>

<style>
.image-container {
  width: 200px;
  height: 200px;
  overflow: hidden;
}

img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease-in-out;
}
</style>

In the above code, you first need to import the vue-img-rotate library through import. Then, in the template section, use the <img alt="How to use Vue to rotate images counterclockwise and clockwise?" > tag to display the image, bind the image path to the src attribute, and pass the ref Add a reference to the image to facilitate subsequent operations. Next, use two buttons to bind the rotateLeft and rotateRight methods respectively to trigger the rotation action.

In the methods section, we implemented the counterclockwise and clockwise rotation methods respectively. Counterclockwise rotation will reduce the rotation angle of the image by 90 degrees, and clockwise rotation will increase the rotation angle of the image by 90 degrees. By modifying the value of angle, you can control the image rotation angle.

Next, in the computed section, we define a rotationStyle calculated property to add a rotation style to the image. By dynamically binding the transform attribute and using the value of this.angle as the parameter of the rotation angle, the image is rotated.

Finally, in the style section, the image container and image style are defined. Limit the image size by setting the width, height and overflow properties of the container. The style of the picture is achieved by setting the maximum width, height and object-adaptive object-fit attributes, and at the same time, the rotation of the picture is smoother through the transition effect.

Through the above code examples, we can easily implement the counterclockwise and clockwise rotation functions of images in the Vue project. You only need to simply bind the click event, modify the value of the rotation angle, and then control the image style through calculated properties. Using the vue-img-rotate library avoids developers from writing their own rotation algorithms.

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