Moiré spiral patterns resulting from translating, rotating, as well as scaling random points. As described by Tadashi Tokieda on Numberphile
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January 3, 2016 15:20
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Moiré-rotation-translate-scale
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>Moiré Pattern</title> | |
<style media="screen"> | |
body{ | |
margin: 0; | |
} | |
canvas{ | |
position: fixed; | |
top: 0; | |
} | |
</style> | |
</head> | |
<body> | |
<canvas id="cBottom"></canvas> | |
<canvas id="cTop"></canvas> | |
</body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script type="text/javascript"> | |
var c24 =['#33cc33','#ff0000','#3366ff','#00e7b4','#a6cee3','#fb9a99','#b15928','#b4002f','#bcbc34','#393d77','#ff8200','#7800a8','#ff00d7','#ffc100','#b2df8a','#fdb56d','#cab2d6','#c39c95','#29bece','#cc70bc','#669c95','#ff7a9a','#e3026f','#006d33'] | |
colors = d3.shuffle(c24).slice(-2) | |
w = window.innerWidth | |
h = window.innerHeight | |
canvases = d3.selectAll('canvas').attr({ | |
width:w, | |
height:h, | |
'z-index':function (d,i) {return i} | |
}) | |
sqW = 6 | |
numPts = w*h/(sqW*sqW*sqW) | |
xRange = d3.range(0,w) | |
x = d3.range(0,numPts).map(function () { | |
return d3.shuffle(xRange)[0] | |
}) | |
yRange = d3.range(0,h) | |
y = d3.range(0,numPts).map(function () { | |
return d3.shuffle(yRange)[0] | |
}) | |
cBottom = d3.select('#cBottom') | |
ctxB = cBottom.node().getContext('2d') | |
d3.range(0,numPts).forEach(function (i) { | |
ctxB.fillStyle = d3.shuffle(colors)[0] | |
ctxB.fillRect(x[i], y[i], sqW, sqW) | |
}) | |
cTop = d3.select('#cTop').style('opacity',.8) | |
ctxT = cTop.node().getContext('2d') | |
ctxT.drawImage(cBottom.node(), 0, 0); | |
zScale = d3.scale.linear().domain([0,w]).range([.9,1]) | |
rScale = d3.scale.linear().domain([-90,90]).range([-5,5]) | |
xScale = d3.scale.linear().domain([0,w]).range([-w/16,w/16]) | |
yScale = d3.scale.linear().domain([0,h]).range([-h/16,h/16]) | |
cTop.on('mousemove',function () { | |
m = d3.mouse(this) | |
cBottom.style('transform','scale('+zScale(m[0])+')') | |
cTop.style('transform','translate(' | |
+xScale(m[0])+'px, '+yScale(m[1])+'px) ' | |
+'rotate('+rScale(-Math.atan((m[0] - w/2)/(m[1] - h/2))*180/Math.PI) +'deg)') | |
}) | |
</script> | |
</html> |
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