How to use Vue to implement page design with parabolic animation?

In modern front-end development, using animation to improve user experience has become a part that cannot be ignored. Parabolic animation is one of them, which can bring a fun and relaxed feeling to the page and can be used in various scenarios that require user operations, such as adding items to a shopping cart. In this article, we will learn how to implement a page design with parabolic animation using Vue.

First of all, we need to understand what the essence of parabolic animation is. It mainly involves two key points: animation curves and animation parameters. Animation curve refers to a curve path. Parabolic animation is a curve path that starts from the vertex and changes continuously. It is actually a quadratic function y = ax^2 bx c, where a, b, and c are animations. parameter. The formula of the curve path is not fixed and can be set freely according to needs.

Next, we need to start implementing this animation effect.

The first step is to install the necessary dependencies. In this example, we will use vue-router to manage user routing and Tween.js to generate animation curves. The following are the necessary commands:

npm install vue-router
npm install tween.js

The second step is basic layout. We need to use Vue's template syntax to write the basic layout. The following is an example:

<template>
  <div class="container">
    <router-link to="/">首页</router-link>
    <router-view class="content"></router-view>
  </div>
</template>

In this template, we can see a simple navigation link and a routing view. This view will switch when a navigation link is clicked to render the desired content.

The third step is to add animation effects. We need to add a function to our component that will use the tween.js library to generate a parabolic curve path and apply it to the elements on the view. The following is the implementation code:

<script>
import * as THREE from 'three'
import { Tween } from 'tween.js'

export default {
  name: 'HomePage',
  data() {
    return {
      position: {x: 0, y: 0, z: 0},
      velocity: {x: 0, y: 0, z: 0},
      acceleration: {x: 0, y: -9.8, z: 0},
    }
  },
  mounted() {
    const camera = new THREE.PerspectiveCamera(70, window.innerWidth / window.innerHeight, 0.1, 1000)
    camera.position.z = 75

    const scene = new THREE.Scene()

    const renderer = new THREE.WebGLRenderer()
    renderer.setSize(window.innerWidth, window.innerHeight)
    document.body.appendChild(renderer.domElement)

    const geometry = new THREE.SphereGeometry(5, 32, 32)
    const material = new THREE.MeshBasicMaterial({ color: 0xffff00 })
    const sphere = new THREE.Mesh(geometry, material)
    sphere.position.set(-30, 40, 0)
    scene.add(sphere)

    const animate = () => {
      requestAnimationFrame(animate)

      this.velocity.x += this.acceleration.x * 0.01;
      this.velocity.y += this.acceleration.y * 0.01;
      this.velocity.z += this.acceleration.z * 0.01;

      this.position.x += this.velocity.x;
      this.position.y += this.velocity.y;
      this.position.z += this.velocity.z;

      sphere.position.set(this.position.x, this.position.y, this.position.z);

      renderer.render(scene, camera)
    }

    const animateAjax = ({ start, end }) => () => {
      const tween = new Tween(this.position)
      const control = { x: this.position.x, y: this.position.y }
      const speed = 2000

      tween.to(
        { x: end.left, y: end.top },
        Math.sqrt(Math.pow(control.x - end.left, 2) + Math.pow(control.y - end.top, 2)) / speed * 1000
      )

      tween.onUpdate(() => {
        sphere.position.set(this.position.x, this.position.y, this.position.z)
      })

      tween.start()
    }

    animate()
    this.animateAjax = animateAjax
  },
  methods: {
    handleClick(e) {
      const start = { left: e.pageX, top: window.innerHeight - e.pageY - 20 }
      const end = { left: window.innerWidth - 40, top: 40 }
      this.animateAjax({ start, end })()
    }
  }
}
</script>

In this code, we define a data attribute for the initial position, speed and acceleration of the sphere, and then create a Three.js scene in the mounted hook. The animate function will loop during each browser render interval, sequentially creating or destroying the sphere and moving its position. The handleClick function will receive a MouseEvent object as the only parameter, which is used to create a Tween object and move it from the current position of the sphere to a fixed position, thereby generating a parabolic animation path.

The last step is to apply animation effects. We need to add a click event listener to the template to trigger the handleClick function and start the animation. The following is the implementation code:

<template>
  <div class="home">
    <router-link class="navbar" to="/">首页</router-link>
    <h1 class="title">抛物线小球</h1>
    <div class="content">
      <div class="sphere" @click="handleClick"></div>
    </div>
  </div>
</template>

In this code, we added a div element as a ball in the template and added a click event listener to it. In this way, when the user clicks on the ball, the handleClick function is called and the parabolic animation is started.

Through the above steps, we have completed the page design process of using Vue to implement parabolic animation. In the implementation, we need to generate animation curves based on the tween.js library and add the handleClick function to start the animation. In the template, we need to add a click event listener for the ball and associate the handleClick function with it. I hope this article can inspire you and help you better use Vue to implement page design.

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