This is Nexus, my personal website, live at thilantran.com.

Nexus is built with React, and uses Gatsby as a static site generator for easy hosting on Netlify.

To build:

$ yarn install
$ gatsby develop # or gatsby build to serve from public/ folder

Nexus is no ordinary, bland portfolio website. The landing page of Nexus features a carousel of unique, eye-catching web development showcases that users can switch between and customize with options.

Currently, these showcases are:

1. Conway's Game of Life coded in JS using canvas methods and window.requestAnimationFrame to draw performant animations.
   • Includes options to change colors, trace cell path and change trace lengths, as well as feeding in a 1D cellular automata as input into the 2D automata.
2. An animation of a random 1D cellular automata from one of the 256 Wolfram codes, also coded in JS using canvas.
   • Includes options to change colors and switch between all rules or only pretty rules.
3. A simulation of particles and collisions again using JS and canvas.
   • Includes color and gravity options.

I plan to add more showcases as I go along, and Nexus is designed to be modular enough so that additional showcases can be loaded in with ease.

A JS showcase module has the following interface:

import {
  init,
  draw,
  clearDraw,
  spawn,
  spawnPrompt
  reset,
  options,
  setOption,
  optionsInputAttributes
} from 'showcase.js';

To load a new showcase module, import it in src/components/App.js, and add it to the showcases array along with any initial options for the init function in showcaseInitOptions.

Nexus will call the module's functions as follows:

• init is called to initialize the showcase, and configured options from showcaseInitOptions are passed in.
• draw is called whenever the showcase is focused in the carousel, and clearDraw is called whenever the showcase becomes inactive.
• spawn is called when the main action button on the landing page is clicked.
  • spawnPrompt is the action text on the button.
• reset is called when a user clicks on the reset button in options.
• options is an array of constants or enums representing the possible shwowcase options.
• setOption(option, val) will be called by Nexus to set val for one option from options.
• optionsInputAttributes is an array that is used to initialize the options menu for the showcase.

Example optionsInputAttributes:

const optionInputAttributes = [
  {
    desc: 'Greyscale', // user-friendly description for option
    attr: { // attributes that are spread onto the option's input element
      type: 'radio',
      name: 'color',
      id: 'greyscale'
    },
    option: options.greyscale, // the specific option to set with setOption (enum or constant)
    init: false // the initial value ('checked' for radio / checkboxes, or 'value' otherwise)
  },
  ... // rest of options
]

Originally Nexus was written entirely in native JS, without any libraries, but I decided to port it to React / Gatsby in order to make future development less of a hassle, and to take advantage of bundlers like Webpack to make the distribution more compressed (eg. using webpack image compression plugins at first, and gatsby-image later on).

I also took the opportunity to try out Gatsby and use it as a framework.

The original native JS implementation can still be accessed under pure-js/.

When I transitioned from my native JS to my React implementation, I ran into issues where buttons or elements with onClick events would require two presses on mobile to activate. Note that my React code was essentially a direct port of my native JS implementation, which did not have this double click issue.

I ended up writing a custom hook to use the touchstart, touchend, and touchmove events to simulate a click event on mobile (if touch is supported), which avoids the double click issue.

useResponsiveClick hook and usage:

// abridged hook implementation:
const useResponsiveClick = ( onClick, delay = 300) => {
  const [touchDown, setTouchDown] = useState(null);
  const onTouchMove = () => setTouchDown(null);
  const onTouchStart = () => setTouchDown(new Date());
  const onTouchEnd = (evt) => {
    if (touchDown && new Date() - touchDown < delay) {
      onClick(evt);
      setTouchDown(null);
      evt.preventDefault(); // don't trigger redundant click event that can occcur
    }
  };
  return { onTouchMove, onTouchStart, onTouchEnd };
};

// hook usage:
import { useResponsiveClick } from './hooks';

const responsiveButton = (props) => {
  const buttonEvents = useResponsiveClick(props.onClick):
  return (
    <div className="button" {...buttonEvents}>
      {props.buttonText}
    </div>
  );
};