1wheel/gcd.js

## gcd.js
function drawGCD(){
  var stack = []

  var a = 960 - Math.floor(Math.random()*100), b = 400 + Math.floor(Math.random()*100)

  function gcd(u, v){
    stack.push({u: u, v: v})
    return v ? gcd(v, u % v) : u
  }

  gcd(a, b)


  var size = 960,
      s    = 960/Math.max(a, b),
      s = 1
      colors = ["#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd", "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf"]

  stack[0].translate = [0, 0]

  stack.forEach(function(d, i){
    d.i = i

    d.us = d.u*s
    d.vs = d.v*s

    d.prev = i ? stack[i - 1] : d

    d.flipped = !(!i || !(i % 2))
    d.x = d.flipped ? d.vs : d.us
    d.y = d.flipped ? d.us : d.vs

    d.num = Math.floor(d.u/d.v)

    d.translate = d.prev.translate.slice()
    if (i) d.translate[+!d.flipped] += d.prev.v*d.prev.num
    console.log(d.flipped, d.translate)
    d.color = colors[i]
  })


  var svg = d3.select('body').html('').append('svg')
      .attr({width: size, height: 500})

  svg.append('rect').attr({width: a, height: b})

  svg.dataAppend(stack, 'g')
    .each(function(d){
      if (!d.v) return

      d3.select(this).dataAppend(d3.range(d.num).map(function(i){ return {i: i, j: d.i, p: d} }), 'rect.step')
          .attr(d.flipped ? 'y' : 'x', function(e){ return e.i*d.v })
          .attr('width',  d.v)
          .attr('height', d.v)
          .style('fill', d.color)
          .style('stroke', d3.rgb(d.color).darker(2))
    })
    .translate(ƒ('translate'))


  svg.selectAll('rect.step').style('opacity', 0)
    .transition().delay(function(d, i){ return d ? (d.j + 1)*700 : 0 })
      .style('opacity', 1)
      .style('stroke-width', 10)
    .transition().duration(500)
      .style('stroke-width', 1)


  svg.append('text')
      .translate([10, 500/2])
    .dataAppend(stack, 'tspan.number')
      .text(function(d){ return ' ' + d.u + ' ' })

      .style({fill: function(d, i){ return i ? d.prev.color : 'black' }})
      .style('opacity', 0)
    .transition().delay(function(d){ return d.i*700 })
      .style('opacity', 1)

  window.setTimeout(drawGCD, stack.length*700 + 1000)
}


drawGCD()

## index.html
<!DOCTYPE html>
<meta charset="utf-8">

<style>
rect{
  fill-opacity: 1;
  stroke: black;
}

svg{
  overflow: visible;
}

body{
  margin: 0px;
}

html{
  width: 960px;
  height: 500px;
}

.tbl{
  display: inline-block;
  width: 360px;
  vertical-align: top;
}

.cell{
  display: inline-block;
  width: 60px;
}

.number{
  font-size: 500%;
  font-family: monospace;
  text-shadow: 0 1px 0 #ccc, 1px 0 0 #ccc, 0 -1px 0 #ccc, -1px 0 0 #ccc;

}

</style>

<body></body>

<script src="/1wheel/raw/67b47524ed8ed829d021/d3-3.5.5.js"></script>
<script src="/1wheel/raw/67b47524ed8ed829d021/lodash-3.8.0.js"></script>
<script src='/1wheel/raw/1b6758978dc2d52d3a37/d3-jetpack.js'></script>
<script src='/1wheel/raw/1b6758978dc2d52d3a37/d3-starterkit.js'></script>
<script src='/1wheel/raw/5d32ecb8a54b42f53646/geometry.js'></script>

<script src='gcd.js'></script>

## preview.png

      
    Raw
  

              preview.png
            
          
## thumbnail.png

      
    Raw
  

              thumbnail.png
	function drawGCD(){
	var stack = []

	var a = 960 - Math.floor(Math.random()100), b = 400 + Math.floor(Math.random()100)

	function gcd(u, v){
	stack.push({u: u, v: v})
	return v ? gcd(v, u % v) : u
	}

	gcd(a, b)


	var size = 960,
	s = 960/Math.max(a, b),
	s = 1
	colors = ["#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd", "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf"]

	stack[0].translate = [0, 0]

	stack.forEach(function(d, i){
	d.i = i

	d.us = d.u*s
	d.vs = d.v*s

	d.prev = i ? stack[i - 1] : d

	d.flipped = !(!i \|\| !(i % 2))
	d.x = d.flipped ? d.vs : d.us
	d.y = d.flipped ? d.us : d.vs

	d.num = Math.floor(d.u/d.v)

	d.translate = d.prev.translate.slice()
	if (i) d.translate[+!d.flipped] += d.prev.v*d.prev.num
	console.log(d.flipped, d.translate)
	d.color = colors[i]
	})


	var svg = d3.select('body').html('').append('svg')
	.attr({width: size, height: 500})

	svg.append('rect').attr({width: a, height: b})

	svg.dataAppend(stack, 'g')
	.each(function(d){
	if (!d.v) return

	d3.select(this).dataAppend(d3.range(d.num).map(function(i){ return {i: i, j: d.i, p: d} }), 'rect.step')
	.attr(d.flipped ? 'y' : 'x', function(e){ return e.i*d.v })
	.attr('width', d.v)
	.attr('height', d.v)
	.style('fill', d.color)
	.style('stroke', d3.rgb(d.color).darker(2))
	})
	.translate(ƒ('translate'))


	svg.selectAll('rect.step').style('opacity', 0)
	.transition().delay(function(d, i){ return d ? (d.j + 1)*700 : 0 })
	.style('opacity', 1)
	.style('stroke-width', 10)
	.transition().duration(500)
	.style('stroke-width', 1)


	svg.append('text')
	.translate([10, 500/2])
	.dataAppend(stack, 'tspan.number')
	.text(function(d){ return ' ' + d.u + ' ' })

	.style({fill: function(d, i){ return i ? d.prev.color : 'black' }})
	.style('opacity', 0)
	.transition().delay(function(d){ return d.i*700 })
	.style('opacity', 1)

	window.setTimeout(drawGCD, stack.length*700 + 1000)
	}


	drawGCD()
	<!DOCTYPE html>
	<meta charset="utf-8">

	<style>
	rect{
	fill-opacity: 1;
	stroke: black;
	}

	svg{
	overflow: visible;
	}

	body{
	margin: 0px;
	}

	html{
	width: 960px;
	height: 500px;
	}

	.tbl{
	display: inline-block;
	width: 360px;
	vertical-align: top;
	}

	.cell{
	display: inline-block;
	width: 60px;
	}

	.number{
	font-size: 500%;
	font-family: monospace;
	text-shadow: 0 1px 0 #ccc, 1px 0 0 #ccc, 0 -1px 0 #ccc, -1px 0 0 #ccc;

	}

	</style>

	<body></body>

	<script src="/1wheel/raw/67b47524ed8ed829d021/d3-3.5.5.js"></script>
	<script src="/1wheel/raw/67b47524ed8ed829d021/lodash-3.8.0.js"></script>
	<script src='/1wheel/raw/1b6758978dc2d52d3a37/d3-jetpack.js'></script>
	<script src='/1wheel/raw/1b6758978dc2d52d3a37/d3-starterkit.js'></script>
	<script src='/1wheel/raw/5d32ecb8a54b42f53646/geometry.js'></script>

	<script src='gcd.js'></script>