WeLD

Web Lattice Dynamics: atomic motion in crystals, in a browser

Preview of master branch index.html: https://htmlpreview.github.io/?https://github.com/aephil/WeLD/blob/master/index.html

Running the code

First, install the required npm modules: npm install --dev.
Make sure you have npx installed globally (npm install -g npx).
Run the http server with the command npm start

Unit tests

Unit tests for key bits of code should be put in the test directory, for example tests/someDirectory/testFileNumberOne.test.js. To run the tests, run npm test from your terminal. If the source code has changed since it was last transpiled, it needs to be transpiled again before you rerun the tests. To tranpsile, run npm run transpile. However, npm test automatically does this. If you know you don't need to transpile again and want to save time, you can use npm run _test, which will not transpile the source code again.

IMPORTANT: When importing functions using require in the node environment, you must access the transpiled directory rather than src. So for example, to require src/modules/physics/ForceMap.js from tests/file.test.js, you need the path ../transpiled/modules/physics/ForceMap, not ../src/transpiled/modules/physics/ForceMap.

Imports/exports

When running code in the browser, use ES6 module syntax, e.g.:

// src/path/to/functionDefinedHere.js
export const myFunc = function(x, y, z) {
    // do stuff
}

// src/programs/iWantTheFunctionInThisFile.js
import {myFunc} from '../path/to/functionDefinedHere.js';
// Now w can use myFunc in this file

When running code in NODE, e.g. for running tests, first make sure you have transpiled the source code since the last change to the source code (Happens automatically if you use npm test to run the tests), and then use CommonJS module syntax, with the caveat that you need to access the transpiled directory instead of the src directory, e.g.:

// src/path/to/functionDefinedHere.js
export const myFunc = function(x, y, z) {
    // do stuff
}

// tests/functions/testMyFunc.test.js
const myFunc = require('../../transpiled/path/to/functionDefinedHere');
// Now we can use myFunc in this file

Note that when we use the CommonJS syntax, we do not put the .js at the end, whereas we do when we use ES6, and additionally it is important that when using require in node for this codebase that you access the transpiled directory.

(experimental) UserInterface Terminal

The Terminal accepts commands used to modify the simulation.

• move [id:uint] [x:int] [y:int] [z:int]: Moves a node [id] to the location in the simulation
• sample [size:uint]: Changes the sample size in the plot window. A higher sample size zoom out the reading.
• probe [rate:uint]: Changes the probe rate in the plot window. The probe rate for individual nodes is rate/10.
• fps [rate:uint] Changes the framerate.