How to implement the zoom function of a specific area of ​​an image through Vue?

How to implement the zoom function of a specific area of ​​an image through Vue?

Introduction:
In web design and development, we often encounter situations where larger images need to be displayed. In order to provide a better user experience, users are often expected to zoom in on certain areas to view details. This article will introduce how to implement the zoom function of specific areas of the picture through Vue, so that users can easily view the details of the picture.

Technical preparation:
Before implementing this function, you need to prepare the following technical tools:

1. Vue.js: a JavaScript framework for building interactive user interfaces.
2. Vue router: used to manage navigation between different pages in the website.
3. CSS style: used to control page layout and image styles.

Step 1: Create a Vue project
First, we need to create a Vue project. If you already have an existing Vue project, you can skip this step. Open the terminal, enter the project directory, and execute the following command:

vue create picture-zoom
cd picture-zoom

Step 2: Create a route
Next, we need to create a route to manage the navigation of different pages. Create a router.js file in the src directory and add the following code in the file:

import Vue from 'vue';
import VueRouter from 'vue-router';

// 导入相关页面组件
import Home from './components/Home.vue';
import Picture from './components/Picture.vue';

Vue.use(VueRouter);

const routes = [
  { path: '/', component: Home },
  { path: '/picture', component: Picture },
];

const router = new VueRouter({
  routes,
});

export default router;

Step 3: Create page components
Now, we need to create two page components, one to display the homepage , one used to display the image magnification function. Create Home.vue and Picture.vue files in the src/components directory, and add the following codes respectively:

Home.vue:

<template>
  <div>
    <h1>首页</h1>
    <router-link to="/picture">点击查看图片</router-link>
  </div>
</template>

<script>
export default {
  name: 'Home',
};
</script>

Picture.vue:

<template>
  <div>
    <h1>图片放大</h1>
    <div class="picture-container">
      <div class="zoom-container">
        <img  :src="pictureSrc" @mousemove="showZoom" @mouseout="hideZoom" alt="How to implement the zoom function of a specific area of ​​an image through Vue?" >
        <div v-show="showZoomBox" class="zoom-box" :style="{ top: zoomTop + 'px', left: zoomLeft + 'px' }">
          <img  :src="pictureSrc" :  style="max-width:90%"translate(-' + zoomLeft * zoomRatio + 'px, -' + zoomTop * zoomRatio + 'px)' }" alt="How to implement the zoom function of a specific area of ​​an image through Vue?" >
        </div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Picture',
  data() {
    return {
      pictureSrc: 'your-picture-url.jpg',
      showZoomBox: false,
      zoomTop: 0,
      zoomLeft: 0,
      zoomRatio: 2,
    };
  },
  methods: {
    showZoom(event) {
      this.showZoomBox = true;
      this.zoomTop = event.offsetY - 50;
      this.zoomLeft = event.offsetX - 50;
    },
    hideZoom() {
      this.showZoomBox = false;
    },
  },
};
</script>

<style scoped>
.picture-container {
  display: flex;
  justify-content: center;
}

.zoom-container {
  position: relative;
}

.zoom-box {
  position: absolute;
  width: 100px;
  height: 100px;
  border: 2px solid red;
  overflow: hidden;
}

.zoom-box img {
  width: 100%;
  height: auto;
}
</style>

Step 4: Run the project
Finally, we need to add routing to the Vue instance and run the project. Add the following code to the src/main.js file:

import Vue from 'vue';
import App from './App.vue';
import router from './router';

Vue.config.productionTip = false;

new Vue({
  router,
  render: (h) => h(App),
}).$mount('#app');

Then run the following command to start the project:

npm run serve

Conclusion:
Through the above steps, we successfully implemented the image through Vue Magnification function for specific areas. Users can move the mouse over the picture in the Picture page to see the details of the picture in the enlarged area. Hope this article is helpful to you, thank you!

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