Chaos Game - inspired by Numberphile
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<canvas id="canvas" width="800" height="600"></canvas> | |
<button onclick="randomStart();drawMassive(5000);">Random</button> | |
<button onclick="niceStart();drawMassive(50000);">Nice</button> | |
<script type="text/javascript"> | |
const canvas = document.getElementById('canvas'), | |
ctx = canvas.getContext('2d'); | |
const A=[0,0],B=[0,0],C=[0,0]; | |
var S=[0,0]; | |
function nextPoint() { | |
var nr = parseInt(Math.random()*6)+1; | |
var ot = [0,0]; | |
if(nr===1||nr===2) { ot = A; } else if(nr===3||nr===4) { ot = B; } else if(nr===5||nr===6) { ot = C; } | |
var M = [ (S[0]+ot[0])/2 , (S[1]+ot[1])/2 ]; | |
S = M; | |
drawPoint(M[0],M[1],"#FF0000"); | |
return nr; | |
} | |
function randomStart() { | |
A[0] = rN(800); | |
A[1] = rN(600); | |
B[0] = rN(800); | |
B[1] = rN(600); | |
C[0] = rN(800); | |
C[1] = rN(600); | |
S[0] = rN(800); | |
S[1] = rN(600); | |
drawPoint(A[0],A[1],'#FF0000'); | |
drawPoint(B[0],B[1],'#00FF00'); | |
drawPoint(C[0],C[1],'#0000FF'); | |
} | |
function niceStart() { | |
A[0] = 400; | |
A[1] = 10; | |
B[0] = 10; | |
B[1] = 590; | |
C[0] = 790; | |
C[1] = 590; | |
S[0] = 400; | |
S[1] = 300; | |
drawPoint(A[0],A[1],'#FF0000'); | |
drawPoint(B[0],B[1],'#00FF00'); | |
drawPoint(C[0],C[1],'#0000FF'); | |
} | |
function rN(f) { | |
return parseInt(Math.random()*f); | |
} | |
function rC() { | |
return [rN(800),rN(600)]; | |
} | |
function drawMassive(no) { | |
let s = new Date()/1; | |
for(var i=0;i<no;i++) { nextPoint();} | |
console.log("time to Draw "+(new Date()/1-s)); | |
} | |
function drawPoint(x,y,color,size) { | |
ctx.beginPath(); | |
ctx.lineWidth = 2; | |
ctx.strokeStyle = (color||false)? color : '#000000'; | |
var s = (size||false)? size : 2; | |
ctx.arc(x,y,s,0,2*Math.PI); | |
ctx.stroke(); | |
} | |
</script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment