VTK笔记——vtk.js工程搭建

发表于 2020-12-15 分类于 VTK笔记阅读次数： Disqus：

本文字数： 5.8k 阅读时长 ≈ 5 分钟

这篇笔记详细说明了vtk.js项目是如何搭建的，旨在快速入手工程搭建，享受web vtk的快乐人生。

一.环境

首先，我们需要安装js的运行环境Node.js和npm：
在这里插入图片描述
从Node.js官网可以看到目前最新的版本是15.4.0，为了兼容，我们就选择推荐的14.15.1版本。
在Windows上安装需选择全部组件，包括Add to PATH.
安装完成后，可通过node -v命令查看结果：

$ node -v
v14.15.1

npm, node package manager, 即Node.js的包管理器。这个东西很强大，它在Node.js安装的时候就顺带安装好了，也可以通过npm -v命令查看：

$ npm -v
6.14.8

二.创建

Ok, 接下来我们来创建一个工程，看看它的结构如何。

1.创建工程主目录

$ mkdir MyVtkWebDemo

$ cd MyVtkWebDemo/

2.初始化

$ npm init

3.安装vtk.js及其依赖项

$ npm install vtk.js –save

可通过命令查看包详细信息：

$ npm info vtk.js

4.安装和配置webpack

$ npm install –save-dev webpack

查看包信息：

$ npm info webpack

从这里可以看出，webpack的版本为5.10.0，那还需要安装CLI：

$ npm install –save-dev webpack-cli

5.新建./webpack.config.js

var path = require('path');
var webpack = require('webpack');
var vtkRules = require('vtk.js/Utilities/config/dependency.js').webpack.core.rules;

// Optional if you want to load *.css and *.module.css files
// var cssRules = require('vtk.js/Utilities/config/dependency.js').webpack.css.rules;

var entry = path.join(__dirname, './src/index.js');
const sourcePath = path.join(__dirname, './src');
const outputPath = path.join(__dirname, './dist');

module.exports = {
  entry,
  output: {
    path: outputPath,
    filename: 'MyWebApp.js',
  },
  module: {
    rules: [
        { test: /\.html$/, loader: 'html-loader' },
    ].concat(vtkRules),
  },
  resolve: {
    modules: [
      path.resolve(__dirname, 'node_modules'),
      sourcePath,
    ],
  },
};

6.修改package.json

将scripts

1
2
3

"scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  }

替换为

"scripts": {
    "build": "webpack --config webpack.config.js",
    "build:release": "webpack --progress --colors --mode production",
    "start": "webpack serve --content-base ./dist",
    "commit": "git cz",
    "semantic-release": "semantic-release"
  }

7.创建应用实例

./src/index.js


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();
});

8.控制模板

./src/controller.html

<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>

9.用于加载生成的应用程序的主web页面

./dist/index.html

<!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>