从0开始疫情3D地球 - 3D疫情地球VDEarth - 2 - 前端代码构建

基于Threejs的3D疫情地球，环境采用上篇博客里的前端准备环境。

首先创建前端代码文件夹VDEarth 

mkdir VDEarth && cd VDEarch

安装组件

npm安装应用到的组件

安装webpack组件

npm install -D webpack 

安装webpack-cli组件，webpack组件4.0+需要

npm instlal -D webpack-cli   

安装threejs组件

npm install three    

安装lodash组件

npm install lodash

代码结构

webpack搭建前端代码框架

npm init -y

分离webpack配置，分离为webpack.base.js,webpack.dev.js,webpack.prod.js

搭建好的代码结构：

没什么好说的，搭建可以参考webpack官网

webpack.base.js 

配置入口文件为src下index.js文件

输出配置为类库方式，另外引入一些常用插件和loader

 1 const path = require('path');
 2 let HtmlWebpackPlugin = require('html-webpack-plugin');
 3 const { CleanWebpackPlugin } = require('clean-webpack-plugin');
 4 const MiniCssExtractPlugin = require('mini-css-extract-plugin');
 5 const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
 6 const copyWebpackPlugin = require('copy-webpack-plugin');
 7 module.exports = {
 8   entry: './src/index.js',
 9   output: {
10     filename: 'VDEarth.js',
11     path: path.resolve(__dirname, 'dist'),
12     library: 'VDEarth',
13     libraryTarget: 'umd',
14     umdNamedDefine: true,
15   },
16   plugins: [
17     new HtmlWebpackPlugin({
18       template: './src/public/index.html',
19     }),
20     new CleanWebpackPlugin(),
21     new MiniCssExtractPlugin(),
22     new OptimizeCssAssetsPlugin(),
23     new copyWebpackPlugin([
24       {
25         from: __dirname + '/src/fonts', //打包的静态资源目录地址
26         to: './fonts', //打包到dist下面的public
27       },
28     ]),
38   ],
39   module: {
40     rules: [
41       {
42         test: /\.(woff|woff2|eot|ttf|otf|json)$/,
43         use: {
44           loader: 'file-loader',
45           options: {
46             name: 'fonts/[name].[ext]',
47             publicPath: './',
48           },
49         },
50       },
51       {
52         test: /\.(svg|gif|png|jpg)$/,
53         use: {
54           loader: 'file-loader',
55           options: {
56             name: 'images/[name].[ext]',
57             publicPath: './',
58           },
59         },
60       },
61       {
62         test: /\.(css|less)$/,
63         use: [MiniCssExtractPlugin.loader, 'css-loader', 'less-loader'],
64       },
72       {
73         test: /\.(jsx|js)$/,
74         exclude: /node_modules/,
75         loader: 'babel-loader',
76       },
77     ],
78   },
79   externals: {
80     lodash: {
81       commonjs: 'lodash',
82       commonjs2: 'lodash',
83       amd: 'lodash',
84       root: '_',
85     },
86   },
87 };

package.json

修改package.json，这里删除scripts属性下的配置，修改为

"build": "webpack --config webpack.prod.js",

"watch": "webpack --watch",

"start": "webpack-dev-server --config webpack.dev.js"

build命令进行项目的发布

start命令使用了webpack-dev-server，借助这个可以进行热启动，代码调试

watch命令可以不用，只是检测改动

{
  "name": "vdearth",
  "version": "1.0.0",
  "description": "",
  "private": true,
  "dependencies": {
    "lodash": "^4.17.15",
    "three": "^0.115.0"
  },
  "devDependencies": {
    "@babel/cli": "^7.8.4",
    "@babel/core": "^7.9.0",
    "@babel/preset-env": "^7.9.0",
    "babel-loader": "^8.1.0",
    "clean-webpack-plugin": "^3.0.0",
    "copy-webpack-plugin": "^5.1.1",
    "css-loader": "^3.5.2",
    "file-loader": "^6.0.0",
    "html-webpack-plugin": "^4.0.3",
    "json-loader": "^0.5.7",
    "less": "^3.11.1",
    "less-loader": "^5.0.0",
    "mini-css-extract-plugin": "^0.9.0",
    "optimize-css-assets-webpack-plugin": "^5.0.3",
    "style-loader": "^1.1.3",
    "webpack": "^4.42.1",
    "webpack-cli": "^3.3.11",
    "webpack-dev-server": "^3.10.3",
    "webpack-merge": "^4.2.2"
  },
  "scripts": {
    "build": "webpack --config webpack.prod.js",
    "watch": "webpack --watch",
    "start": "webpack-dev-server --config webpack.dev.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

分层文件

在src文件内分别创建fonts，image，public，style文件夹，存放3D可视化的分类素材

 新增VDEarth.js 作为主要地球逻辑的实现类，indexjs作为组件入口文件

 主要功能js

首先要支持3D地球的可视化的显示，需要用到threejs的几个对象，如mesh，material，geometry，依次创建几个js，mode.js，material.js，geometry.js

支持地球上的标记，事件，动画，数据获取，依次创建marker.js ,eventListener.js, animate.js,socketjs

创建组件的一些工具方法，创建utils.js

加上上篇创建的入口index.js ,vdEarth.js主文件，目录结构如下

至此，简单的前端代码框架就搭建完成了，npm run start 就可以运行起来

相关链接