【VTK.js】将vtk.js作为ES6依赖项来使用

本是古典何须时尚 2023-06-27 06:28 20阅读 0赞

本文介绍如何使用vtk.js作为依赖项，以及使用如Webpack或NPM等工具集来构建应用程序。

# 1 创建工程结构 #

$ mkdir MyWebProject
    $ cd MyWebProject
    $ npm init
    
      This utility will walk you through creating a package.json file.
      It only covers the most common items, and tries to guess sensible defaults.
    
      See `npm help json` for definitive documentation on these fields
      and exactly what they do.
    
      Use `npm install <pkg> --save` afterwards to install a package and
      save it as a dependency in the package.json file.
    
      Press ^C at any time to quit.
      name: (MyWebProject) your-project-name
      version: (1.0.0) 0.0.1
      description: vtk.js application
      entry point: (index.js) src/index.js
      test command:
      git repository:
      keywords: Web visualization using VTK
      author:
      license: (ISC) BSD-2-Clause
      About to write to /.../MyWebProject/package.json:
    
      { 
        "name": "your-project-name",
        "version": "0.0.1",
        "description": "vtk.js application",
        "main": "src/index.js",
        "scripts": { 
          "test": "echo \"Error: no test specified\" && exit 1"
        },
        "keywords": [
          "Web",
          "visualization",
          "using",
          "VTK"
        ],
        "author": "",
        "license": "BSD-2-Clause"
      }
    
    
      Is this ok? (yes)

然后使用如下命令安装并保存你的依赖项：

$ npm install vtk.js --save
    $ npm install kw-web-suite --save-dev

# 2 Webpack配置 #

## 2.1 ./webpack.config.js ##

在文件夹根目录创建webpack.config.js并复制以下内容：

## 2.2 ./package.json ##

在已有的package.json文件中的“script”节点中添加以下脚本：

{ 
      [...],
      "scripts": { 
        "build": "webpack --progress --colors --mode development",
        "build:release": "webpack --progress --colors --mode production",
        "start": "webpack-dev-server --content-base ./dist",
    
        "commit": "git cz",
        "semantic-release": "semantic-release"
      }
    }

# 3 创建应用程序 #

## 3.1 ./src/index.js ##

新建src文件夹，在其中新建index.js文件并填入以下内容：

import vtkFullScreenRenderWindow from 'vtk.js/Sources/Rendering/Misc/FullScreenRenderWindow';
    
    import vtkActor           from 'vtk.js/Sources/Rendering/Core/Actor';
    import vtkCalculator      from 'vtk.js/Sources/Filters/General/Calculator';
    import vtkConeSource      from 'vtk.js/Sources/Filters/Sources/ConeSource';
    import vtkMapper          from 'vtk.js/Sources/Rendering/Core/Mapper';
    import {  AttributeTypes } from 'vtk.js/Sources/Common/DataModel/DataSetAttributes/Constants';
    import {  FieldDataTypes } from 'vtk.js/Sources/Common/DataModel/DataSet/Constants';
    
    import controlPanel from './controller.html';
    
    // ----------------------------------------------------------------------------
    // Standard rendering code setup
    // ----------------------------------------------------------------------------
    
    const fullScreenRenderer = vtkFullScreenRenderWindow.newInstance();
    const renderer = fullScreenRenderer.getRenderer();
    const renderWindow = fullScreenRenderer.getRenderWindow();
    
    // ----------------------------------------------------------------------------
    // Example code
    // ----------------------------------------------------------------------------
    
    const coneSource = vtkConeSource.newInstance({  height: 1.0 });
    const filter = vtkCalculator.newInstance();
    
    filter.setInputConnection(coneSource.getOutputPort());
    filter.setFormula({ 
      getArrays: inputDataSets => ({ 
        input: [],
        output: [
          {  location: FieldDataTypes.CELL, name: 'Random', dataType: 'Float32Array', attribute: AttributeTypes.SCALARS },
        ],
      }),
      evaluate: (arraysIn, arraysOut) => { 
        const [scalars] = arraysOut.map(d => d.getData());
        for (let i = 0; i < scalars.length; i++) { 
          scalars[i] = Math.random();
        }
      },
    });
    
    const mapper = vtkMapper.newInstance();
    mapper.setInputConnection(filter.getOutputPort());
    
    const actor = vtkActor.newInstance();
    actor.setMapper(mapper);
    
    renderer.addActor(actor);
    renderer.resetCamera();
    renderWindow.render();
    
    // -----------------------------------------------------------
    // UI control handling
    // -----------------------------------------------------------
    
    fullScreenRenderer.addController(controlPanel);
    const representationSelector = document.querySelector('.representations');
    const resolutionChange = document.querySelector('.resolution');
    
    representationSelector.addEventListener('change', (e) => { 
      const newRepValue = Number(e.target.value);
      actor.getProperty().setRepresentation(newRepValue);
      renderWindow.render();
    });
    
    resolutionChange.addEventListener('input', (e) => { 
      const resolution = Number(e.target.value);
      coneSource.setResolution(resolution);
      renderWindow.render();
    });

## 3.2 ./src/controller.html（控制面板文件） ##

在src文件夹下新建controller.html文件并填入以下内容：

<table>
      <tr>
        <td>
          <select class='representations' style="width: 100%">
            <option value='0'>Points</option>
            <option value='1'>Wireframe</option>
            <option value='2' selected>Surface</option>
          </select>
        </td>
      </tr>
      <tr>
        <td>
          <input class='resolution' type='range' min='4' max='80' value='6' />
        </td>
      </tr>
    </table>

## 3.3 ./dist/index.html（主页） ##

新建dist文件夹，在其中新建index.html文件并填入以下内容：

<!DOCTYPE html>
    <html>
      <head>
        <meta http-equiv="Content-type" content="text/html; charset=utf-8"/>
        <meta name="viewport" content="width=device-width, initial-scale=1">
      </head>
      <body>
        <script type="text/javascript" src="MyWebApp.js"></script>
      </body>
    </html>

# 4 构建应用程序 #

在当前目录中使用如下命令构建应用程序并启动一个本地服务用于快速访问（或可以直接用浏览器打开index.html）：

$ npm run build
    $ npm start

可以用地址[http://localhost:8080/][http_localhost_8080]来访问该网站

这个例子渲染了一个圆锥，并且可通过操作面板（controller.html）来修改渲染模式（Points、Wireframe、Surface）及分辨率

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NmYW45Mjc_size_16_color_FFFFFF_t_70]

[http_localhost_8080]: http://localhost:8080/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NmYW45Mjc_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200105091431486.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NmYW45Mjc=,size_16,color_FFFFFF,t_70