syntagmatic · August 30, 2012 22:29
diff --git a/README.md b/README.md
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    <title>Archimedean Spiral</title>
    <script type="text/javascript" src="http://d3js.org/d3.v2.js"></script>
    <style>
      body {
        font-family: 'Lucida Grande', 'Lucida Sans Unicode', 'Geneva', 'Verdana', sans-serif;
        margin: 40px;
      }
      .axis path {
        fill: none;
        stroke: #999;
        stroke-dasharray: 2 3;
      }
      .axis text {
        font-size: 13px;
        stroke: #222;
      }
      text.title {
        font-size: 24px;
      }
      circle.tick { 
        fill: #f3f3f3;
        stroke: #999;
        stroke-dasharray: 2 3;
      }
      path.spiral {
        fill: none;
        stroke: #ee8d18;
        stroke-width: 3px;
      }
    </style>
  </head>
  <body>
    <div id="chart"></div>
    <script type="text/javascript" src="spiral.js"></script>
  </body>
 </html>
diff --git a/spiral.js b/spiral.js
 // a spiral for john hunter, creator of matplotlib

 var width = 400,
    height = 430
    num_axes = 8,
    tick_axis = 1,
    start = 0
    end = 2;

 var theta = function(r) {
  return -2*Math.PI*r;
 };

 var arc = d3.svg.arc()
  .startAngle(0)
  .endAngle(2*Math.PI);

 var radius = d3.scale.linear()
  .domain([start, end])
  .range([0, d3.min([width,height])/2-20]);

 var angle = d3.scale.linear()
  .domain([0,num_axes])
  .range([0,360])

 var svg = d3.select("#chart").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width/2 + "," + (height/2+8) +")");

 var pieces = d3.range(start, end+0.001, (end-start)/1000);

 var spiral = d3.svg.line.radial()
  .interpolate("cardinal")
  .angle(theta)
  .radius(radius);

 svg.append("text")
  .text("And there was much rejoicing!")
  .attr("class", "title")
  .attr("x", 0)
  .attr("y", -height/2+16)
  .attr("text-anchor", "middle")

 svg.selectAll("circle.tick")
    .data(d3.range(end,start,(start-end)/4))
  .enter().append("circle")
    .attr("class", "tick")
    .attr("cx", 0)
    .attr("cy", 0)
    .attr("r", function(d) { return radius(d); })

 svg.selectAll(".axis")
    .data(d3.range(num_axes))
  .enter().append("g")
    .attr("class", "axis")
    .attr("transform", function(d) { return "rotate(" + -angle(d) + ")"; })
  .call(radial_tick)
  .append("text")
    .attr("y", radius(end)+13)
    .text(function(d) { return angle(d) + "°"; })
    .attr("text-anchor", "middle")
    .attr("transform", function(d) { return "rotate(" + -90 + ")" })

 svg.selectAll(".spiral")
    .data([pieces])
  .enter().append("path")
    .attr("class", "spiral")
    .attr("d", spiral)
    .attr("transform", function(d) { return "rotate(" + 90 + ")" });

 function radial_tick(selection) {
  selection.each(function(axis_num) {
    d3.svg.axis()
      .scale(radius)
      .ticks(5)
      .tickValues( axis_num == tick_axis ? null : [])
      .orient("bottom")(d3.select(this))

    d3.select(this)
      .selectAll("text")
      .attr("text-anchor", "bottom")
      .attr("transform", "rotate(" + angle(axis_num) + ")")
  });
 }
	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
	<title>Archimedean Spiral</title>
	<script type="text/javascript" src="http://d3js.org/d3.v2.js"></script>
	<style>
	body {
	font-family: 'Lucida Grande', 'Lucida Sans Unicode', 'Geneva', 'Verdana', sans-serif;
	margin: 40px;
	}
	.axis path {
	fill: none;
	stroke: #999;
	stroke-dasharray: 2 3;
	}
	.axis text {
	font-size: 13px;
	stroke: #222;
	}
	text.title {
	font-size: 24px;
	}
	circle.tick {
	fill: #f3f3f3;
	stroke: #999;
	stroke-dasharray: 2 3;
	}
	path.spiral {
	fill: none;
	stroke: #ee8d18;
	stroke-width: 3px;
	}
	</style>
	</head>
	<body>
	<div id="chart"></div>
	<script type="text/javascript" src="spiral.js"></script>
	</body>
	</html>
	// a spiral for john hunter, creator of matplotlib

	var width = 400,
	height = 430
	num_axes = 8,
	tick_axis = 1,
	start = 0
	end = 2;

	var theta = function(r) {
	return -2Math.PIr;
	};

	var arc = d3.svg.arc()
	.startAngle(0)
	.endAngle(2*Math.PI);

	var radius = d3.scale.linear()
	.domain([start, end])
	.range([0, d3.min([width,height])/2-20]);

	var angle = d3.scale.linear()
	.domain([0,num_axes])
	.range([0,360])

	var svg = d3.select("#chart").append("svg")
	.attr("width", width)
	.attr("height", height)
	.append("g")
	.attr("transform", "translate(" + width/2 + "," + (height/2+8) +")");

	var pieces = d3.range(start, end+0.001, (end-start)/1000);

	var spiral = d3.svg.line.radial()
	.interpolate("cardinal")
	.angle(theta)
	.radius(radius);

	svg.append("text")
	.text("And there was much rejoicing!")
	.attr("class", "title")
	.attr("x", 0)
	.attr("y", -height/2+16)
	.attr("text-anchor", "middle")

	svg.selectAll("circle.tick")
	.data(d3.range(end,start,(start-end)/4))
	.enter().append("circle")
	.attr("class", "tick")
	.attr("cx", 0)
	.attr("cy", 0)
	.attr("r", function(d) { return radius(d); })

	svg.selectAll(".axis")
	.data(d3.range(num_axes))
	.enter().append("g")
	.attr("class", "axis")
	.attr("transform", function(d) { return "rotate(" + -angle(d) + ")"; })
	.call(radial_tick)
	.append("text")
	.attr("y", radius(end)+13)
	.text(function(d) { return angle(d) + "°"; })
	.attr("text-anchor", "middle")
	.attr("transform", function(d) { return "rotate(" + -90 + ")" })

	svg.selectAll(".spiral")
	.data([pieces])
	.enter().append("path")
	.attr("class", "spiral")
	.attr("d", spiral)
	.attr("transform", function(d) { return "rotate(" + 90 + ")" });

	function radial_tick(selection) {
	selection.each(function(axis_num) {
	d3.svg.axis()
	.scale(radius)
	.ticks(5)
	.tickValues( axis_num == tick_axis ? null : [])
	.orient("bottom")(d3.select(this))

	d3.select(this)
	.selectAll("text")
	.attr("text-anchor", "bottom")
	.attr("transform", "rotate(" + angle(axis_num) + ")")
	});
	}