JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">

  <head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/pixi.js/4.7.0/pixi.min.js">
      < /body> < /html >

JavaScript

var app = new PIXI.Application(800, 600, {
  antialias: true
});
document.body.appendChild(app.view);

// Functions

// param color is a number (e.g. 255)
// return value is a string (e.g. ff)
var prepareRGBChannelColor = function(channelColor) {
  var colorText = channelColor.toString(16);
  if (colorText.length < 2) {
    while (colorText.length < 2) {
      colorText = "0" + colorText;
    }
  }

  return colorText;
}

// Getting RGB channels from a number color
// param color is a number
// return an RGB channels object {red: number, green: number, blue: number}
var getRGBChannels = function(color) {
  var colorText = color.toString(16);
  if (colorText.length < 6) {
    while (colorText.length < 6) {
      colorText = "0" + colorText;
    }
  }

  var result = {
    red: parseInt(colorText.slice(0, 2), 16),
    green: parseInt(colorText.slice(2, 4), 16),
    blue: parseInt(colorText.slice(4, 6), 16)
  };
  return result;
}

// Preparaiton of a color data object
// param color is a number [0-255]
// param alpha is a number [0-1]
// return the color data object {color: number, alpha: number, channels: {red: number, green: number, blue: number}}
var prepareColorData = function(color, alpha) {
  return {
    color: color,
    alpha: alpha,
    channels: getRGBChannels(color)
  }
}

// Getting the color of a gradient for a very specific gradient coef
// param from is a color data object
// param to is a color data object
// return value is of the same type
var getColorOfGradient = function(from, to, coef) {
  if (!from.alpha && from.alpha !== 0) {
    from.alpha = 1;
  }
  if (!from.alpha && from.alpha !== 0) {
    to.alpha = 1;
  }

  var colorRed = Math.floor(from.channels.red + coef * (to.channels.red - from.channels.red));
  colorRed = Math.min(colorRed, 255);
  var colorGreen = Math.floor(from.channels.green + coef * (to.channels.green - from.channels.green));
  colorGreen = Math.min(colorGreen, 255);
  var colorBlue = Math.floor(from.channels.blue + coef *...