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index.html
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<!doctype html>
<!--
Dual Axis Rotation Illusion
© Frank Force 2019
GitHub Corner is Copyright (c) 2016 Tim Holman - http://tholman.com
-->
<html>
<head>
<title>Dual Axis Rotation Illusion - By Frank Force</title>
</head>
<style>
</style>
<body>
<center>
<font size=6><b>Dual Axis Rotation Illusion - By Frank Force</b></font>
<font size=5>
<br>
<a href='http://illusionoftheyear.com/2019/12/dual-axis-illusion' target='_blank'><i>Best Illusion of The Year - First Place Winner</i></a>
<br>
<br>
<b>Spin Axis </b>
<input type=radio name=radio_spinAxis value='' id='ambiguous' checked> <label for='ambiguous'>Ambiguous</label>
<input type=radio name=radio_spinAxis value='vertical' id='vertical'> <label for='vertical'>Vertical</label>
<input type=radio name=radio_spinAxis value='horizontal' id='horizontal'> <label for='horizontal'>Horizontal</label>
<br>
<b>Spin Direction </b>
<input type=radio name=radio_spinDirection value=1 id='positive' checked> <label for='positive'>Positive</label>
<input type=radio name=radio_spinDirection value=-1 id='negative'> <label for='negative'>Negative</label>
<br>
<b><label for='checkbox_circleOverlaps'>Circle Overlaps</label> </b><input type=checkbox id=checkbox_circleOverlaps>
<br>
</font>
<canvas id=c width=1280 height=720 style=width:min(80%,900px)></canvas>
</center>
<script>
"use strict";
const x = c.getContext('2d');
const PI = Math.PI;
const S = Math.sin;
const xCenter = c.width/2;
const yCenter = c.height/2;
const width = 450;
const height = 300;
let t = 0;
function DrawCurvePoint(pos, color, radius=30, stroke=0)
{
let X = width*S(pos/3);
let Y = height*S(t+pos/2);
x.beginPath();
x.arc(xCenter+X, yCenter+Y*.9, radius, 0, 7);
x.fillStyle = color;
x.strokeStyle = color;
stroke ? x.stroke() : x.fill();
}
function Update()
{
if (self !== top && !document.hasFocus())
return;
// get settings
let spinAxis = document.querySelector('input[name="radio_spinAxis"]:checked').value;
let spinDirection = parseFloat(document.querySelector('input[name="radio_spinDirection"]:checked').value);
let showDots = checkbox_circleOverlaps.checked;
// clear canvas
c.width += 0;
x.lineWidth = 10;
t += spinDirection/60;
// draw curve
let I = 1e3;
for(let i=I; i--;)
DrawCurvePoint(2*6*PI*i/I, "#000");
if (!showDots)
{
if (spinAxis == 'horizontal')
{
// draw fade
x.fillStyle = '#F00';
for(let i=-32; i<=32; ++i)
{
x.globalAlpha = 2-2*Math.abs(i)/32;
x.fillRect(0, yCenter+i*8, 2e3, 8);
}
x.globalAlpha = 1;
// draw the front part of the curve again
for(let i=I;i--;)
{
if (S(6*PI*i/I+2*PI+1.4+t) > 0)
DrawCurvePoint(2*6*PI*i/I, "#000");
}
}
else if (spinAxis == 'vertical')
{
// draw fade
x.fillStyle = '#08F';
for(let i=-32; i<=32; ++i)
{
x.globalAlpha = 2-2*Math.abs(i)/32;
x.fillRect(xCenter+i*12, 0, 12, 2e3);
}
x.globalAlpha = 1;
// draw the front part of the curve again
for(let i=I;i--;)
{
if (S(4*PI*i/I+2*PI/4) < 0)
DrawCurvePoint(2*6*PI*i/I, "#000");
}
}
}
else
{
if (spinAxis == 'horizontal' || spinAxis == '')
{
// draw dots on overlaps
let color = '#F00';
DrawCurvePoint( 1.57, color, 70, 1);
DrawCurvePoint( 7.87, color, 70, 1);
DrawCurvePoint(11.00, color, 70, 1);
DrawCurvePoint(17.28, color, 70, 1);
}
if (spinAxis == 'vertical' || spinAxis == '')
{
// draw dots on overlaps
// this part is a bit hacky, it should use DrawCurvePoint
x.strokeStyle = '#08F';
x.beginPath(), x.arc(xCenter+width*S(1.05+t*2/3), yCenter, 70, 0, 7), x.stroke();
x.beginPath(), x.arc(xCenter+width*S(3.14+t*2/3), yCenter, 70, 0, 7), x.stroke();
x.beginPath(), x.arc(xCenter+width*S(5.24+t*2/3), yCenter, 70, 0, 7), x.stroke();
}
}
}
setInterval(Update, 16);
</script>
<a href="https://github.com/KilledByAPixel/Dual-Axis-Illusion" target="_blank" class="github-corner" aria-label="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#08F; color:#FFF; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>
</body>
</html>