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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="https://code.jquery.com/jquery-3.1.1.min.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/semantic.min.css">
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/semantic.min.js"></script>
<title>Chaos Game by rachitiitr</title>
<style>
body {
min-width: 820px;
}
#player {
margin: auto;
height: 20px;
}
#container {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
#container * {
margin: 10px;
}
.footer-menu {
margin: auto;
}
</style>
</head>
<body >
<section name="header">
<div class="ui inverted menu">
<a class="item">
<img src="./rachit_dp.png"/> Chaos in Javascript
</a>
<a class="item" target="_blank" href="https://github.com/rachitiitr/chaos-in-javascript/">
<i class="github icon"></i> Star on GitHub
</a>
<a class="item">
<div id="___ytsubscribe_0" style="text-indent: 0px; margin: 0px; padding: 0px; background: transparent; border-style: none; float: none; line-height: normal; font-size: 1px; vertical-align: baseline; display: inline-block; width: 117px; height: 24px;"><iframe ng-non-bindable="" frameborder="0" hspace="0" marginheight="0" marginwidth="0" scrolling="no" style="position: static; top: 0px; width: 117px; margin: 0px; border-style: none; left: 0px; visibility: visible; height: 24px;" tabindex="0" vspace="0" width="100%" id="I0_1584296427540" name="I0_1584296427540" src="https://www.youtube.com/subscribe_embed?usegapi=1&channelid=UC9fDC_eBh9e_bogw87DbGKQ&layout=default&count=default&origin=https%3A%2F%2Frachitiitr.com&gsrc=3p&ic=1&jsh=m%3B%2F_%2Fscs%2Fapps-static%2F_%2Fjs%2Fk%3Doz.gapi.en.OfYsKuVZ3qI.O%2Fam%3DwQE%2Fd%3D1%2Fct%3Dzgms%2Frs%3DAGLTcCMVod3aO7ybjljp3cyn2IsEoP0pUg%2Fm%3D__features__#_methods=onPlusOne%2C_ready%2C_close%2C_open%2C_resizeMe%2C_renderstart%2Concircled%2Cdrefresh%2Cerefresh%2Conload&id=I0_1584296427540&_gfid=I0_1584296427540&parent=https%3A%2F%2Frachitiitr.com&pfname=&rpctoken=35354048" data-gapiattached="true"></iframe></div>
</a>
<audio controls autoplay loop id="player">
<source src="./background_music.webm">
</audio>
</div>
</section>
<section name="canvas">
<div class="ui placeholder segment">
<canvas id="mycanvas" width="800" height="600" style="display:block;margin:0 auto"></canvas>
</div>
</section>
<div id="container">
<div class="ui floating message">
Enter number of bigger vertices:
<div class="ui input focus">
<input id="nthsidedpolygon" type="number" placeholder="must be greater than 2" style="width:200px"/>
</div>
<br/>
Enter %age of distance to travel:
<div class="ui input focus">
<input id="distratio" type="number" placeholder="Try 61.8 i.e GoldenRatio Inverse" style="width:200px"/>
</div>
<br/>
</div>
<button class="ui primary button" onclick="playForSide()">
Amaze me!
</button>
<div class="ui divider"></div>
<div class="ui styled accordion">
<div class="active title">
<i class="dropdown icon"></i>
How this works?
</div>
<div class="active content">
<ul class="list">
<li>We start with a random point.</li>
<li>In each step, we chose randomly one of the bigger vertex and move 50% (or what ever %age you specified) towards it from our current position.</li>
<li>We keep repeating the previous step till infinity.</li>
</ul>
</div>
<div class="title">
<i class="dropdown icon"></i>
Why I made it?
</div>
<div class="content">
<ul class="list">
<li>Programming is my hobby and I enjoy doing random things in my free time (if I get any)</li>
<li>I saw just one example of JS canvas, and was amazed to imagine the things we can do with it.</li>
<li>I love Math + Fractals. I thoroughly enjoyed making this chaos out of nothing in JavaScript.</li>
</ul>
</div>
<div class="title">
<i class="dropdown icon"></i>
Impressed? Learn with me 😁
</div>
<div class="content">
<ul class="list">
<li>Also checkout<a href="https://rachitiitr.github.io/games-in-js">my Game Library in JavaScript</a> that I am writing from scratch</li>
<li>Watch more videos on my Programming Channel <a href="https://youtube.com/c/RachitJain">here</a></li>
<li>More about me at <a href="https://rachitiitr.com">https://rachitiitr.com</a></li>
</ul>
</div>
</div>
</div>
<section name="footer">
<div class="ui inverted borderless menu">
<a class="item footer-menu" href="https://bit.ly/rachityoutube">
Made with <i class="ui heart icon"></i> by Rachit Jain
</a>
</div>
</section>
<script>
// accordion needs initialization -.-
$(document).ready(function(){
$('.ui.accordion').accordion();
});
let canvas = document.querySelector('#mycanvas');
let canvasContext = canvas.getContext('2d');
let centerX = Math.random() * canvas.width;
let centerY = Math.random() * canvas.height;
let RAD = 1;
let POINTS = [];
let N = 3;
let PADDING = 50;
let distRatio = 0.5;
function playForSide() {
N = document.querySelector('#nthsidedpolygon').value;
if (N < 3) {
alert('vertices must be greater than 2');
return;
}
distRatio = document.querySelector('#distratio').value/100;
if (distRatio > 0 && distRatio < 1) {
// all good here
}
else {
alert('distance to travel must be less than 100%, try 61.8');
document.querySelector('#distratio').value = 61.8;
distRatio = 61.8;
}
init();
}
function colorRect(topLeftX,topLeftY, boxWidth,boxHeight, fillColor) {
canvasContext.beginPath();
canvasContext.fillStyle = fillColor;
canvasContext.fillRect(topLeftX,topLeftY, boxWidth,boxHeight);
canvasContext.closePath();
}
function colorCircle(centerX,centerY, radius, fillColor) {
canvasContext.beginPath();
canvasContext.fillStyle = fillColor;
canvasContext.arc(centerX,centerY, radius, 0,Math.PI*2, true);
canvasContext.fill();
canvasContext.closePath();
}
function draw() {
let W = canvas.width;
let H = canvas.height;
let h = H - PADDING;
let origin = [W/2, h/2+PADDING/2];
let rad = h/2;
let theta = (Math.PI*2)/N;
let target = Math.floor(Math.random() * N);
for (let i=0; i<N; i++) {
let currentTheta = i*theta - (Math.PI/2); //rotating by 90 degs for better aesthetics
POINTS[i] = [origin[0] + rad*Math.cos(currentTheta), origin[1]+rad*Math.sin(currentTheta)];
colorCircle(POINTS[i][0],POINTS[i][1], RAD*10, i == target?'red':'cyan');
}
colorCircle(centerX, centerY, RAD, 'cyan');
centerX = (distRatio * POINTS[target][0]) + (1-distRatio) * centerX;
centerY = (distRatio * POINTS[target][1]) + (1-distRatio) * centerY;
const myTimer = setTimeout(draw, 1000/300);
}
function init() {
colorRect(0,0, canvas.width,canvas.height, 'black');
draw();
}
window.onload = function() {
init();
}
</script>
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-142508299-2"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-142508299-2');
</script>
</body>
</html>