How to create cool 3D rotating graphics using Vue and Canvas

How to use Vue and Canvas to create cool 3D rotating graphics

Introduction:
Vue and Canvas are two very powerful front-end technologies. They are good at handling page rendering and image drawing respectively. This article will introduce how to combine Vue and Canvas to create cool 3D rotating graphics effects. We will explore how to use Vue to build a basic page structure, and how to use Canvas to achieve the drawing and rotation effects of 3D graphics. By studying this article, you will be able to understand how to use Vue and Canvas to create stunning 3D dynamic effects.

Text:
1. Create a Vue project and build a basic page structure
First, we need to create a Vue project. If you have not installed Vue CLI, you can install it with the following command:

npm install -g @vue/cli

Create a Vue project and switch to the project directory:

vue create 3d-rotation-graphic
cd 3d-rotation-graphic

Next, we need to install some necessary dependency packages, including Three.js and Canvas libraries:

npm install three vue-canvas

Create a New Vue component RotationGraphic.vue, and define the basic page structure in it:

<template>
  <div>
    <canvas ref="canvas"></canvas>
  </div>
</template>

<script>
import Vue from 'vue';
import { CanvasRenderer } from 'vue-canvas';
import * as THREE from 'three';

Vue.use(CanvasRenderer);

export default {
  name: 'RotationGraphic',
  mounted() {
    this.init();
  },
  methods: {
    init() {
      const canvas = this.$refs.canvas;
      const renderer = new THREE.WebGLRenderer({ canvas });
      // 绘制代码将在下一节中添加
      this.animate();
    },
    animate() {
      // 更新画面的代码将在下一节中添加
    }
  }
};
</script>

<style scoped>
canvas {
  width: 100%;
  height: 100%;
}
</style>

The above code defines a Vue component RotationGraphic with a canvas element, And call the init method in the mounted life cycle hook to initialize and render the graphics. In the next section, we will add the code to draw the graph and update the screen.

2. Draw 3D graphics in Canvas
We will use BoxGeometry and MeshBasicMaterial in the Three.js library to draw a simple cube. Add the following code in the init method to draw graphics:

const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);

const geometry = new THREE.BoxGeometry(1, 1, 1);
const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
const cube = new THREE.Mesh(geometry, material);
scene.add(cube);
camera.position.z = 5;

renderer.setSize(window.innerWidth, window.innerHeight);

The above code creates a scene object scene, a camera object camera and A cube object cube and adds the cube to the scene. The camera's position is set to (0, 0, 5) so that we can see the entire scene. Finally, we set the size of the renderer to the width and height of the window.

3. Realize the dynamic update of the picture
In order to achieve the rotation effect of the graphics, we will update the rotation angle of the cube in the animate method and re-render the scene in each frame. Replace the animate method with the following code:

animate() {
  requestAnimationFrame(this.animate);
  cube.rotation.x += 0.01;
  cube.rotation.y += 0.01;
  renderer.render(scene, camera);
}

The above code uses the requestAnimationFrame method to call the animate method in each frame of the browser. Each frame, the rotation angle of the cube in the x and y directions is increased by 0.01 radians, and the scene is re-rendered through the renderer.

4. Using the 3D rotation graphic component in the Vue application
We will use the RotationGraphic component to demonstrate the 3D rotation graphic effect. Use the RotationGraphic component in the main component of the Vue project and modify the App.vue file:

<template>
  <div id="app">
    <RotationGraphic/>
  </div>
</template>

<script>
import RotationGraphic from './components/RotationGraphic.vue';

export default {
  name: 'App',
  components: {
    RotationGraphic
  }
}
</script>

<style>
#app {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #f5f5f5;
}
</style>

The above code adds an id of app to the page element, add the RotationGraphic component to it. Through CSS styles we center the page and set the background color.

Conclusion:
Through the study of this article, we learned how to combine Vue and Canvas to create cool 3D rotating graphics effects. We created a component named RotationGraphic in the Vue project, used Three.js to draw a cube, and achieved the rotation effect by updating the rotation angle and renderer. I hope that the introduction in this article can help you better understand and apply Vue and Canvas technology to create more stunning front-end effects.

Code example: https://github.com/your-username/3d-rotation-graphic

The above is the detailed content of How to create cool 3D rotating graphics using Vue and Canvas. For more information, please follow other related articles on the PHP Chinese website!