K-means clustering of wine data

I wrote a blog post for packtpub describing the K-means clustering procedure. The codes I provided were written in R, I also pointed to another blog post of mine where I use python to explain this algotithm. I decided to write a D3 visualization of the clusters.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.dot {
  stroke: none;
}

.tooltip{
		position: absolute;
		width: 130px;
		height: 50px;
    padding: 2px;
    font: 12px sans-serif;
    background: lightgreen;
    border: 2px;
    border-radius: 5px;
   /* border-left: 1px;
    border-right: 1px;*/
		pointer-events: none;
	}

</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scale.linear()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var color = d3.scale.category20();

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var tooltip = d3.select("body").append("div")
					.attr("class", "tooltip")
					.style("opacity", 0);

d3.csv("clusters.csv", function(error, data) {
  if (error) throw error;

data.forEach(function(d) {
    d.Alcohol = +d.Alcohol;
    d.Malic = +d.Malic;
    d.cluster = d.cluster;
  });

x.domain(d3.extent(data, function(d) { return d.Alcohol; })).nice();
  y.domain(d3.extent(data, function(d) { return d.Malic; })).nice();

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("Alcohol");

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("class", "label")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Malic")

svg.selectAll(".dot")
      .data(data)
    .enter().append("circle")
      .attr("class", "dot")
      .attr("r", 5)
      .attr("cx", function(d) { return x(d.Alcohol); })
      .attr("cy", function(d) { return y(d.Malic); })
      .style("fill", function(d) { return color(d.cluster); })
      .on("mouseover", function(d){
		     tooltip.transition()
		     	.duration(200)
		     	.style("opacity", .9);
		     tooltip.html("Cluster: " + d.cluster + "<br/> Alcohol: " + d.Alcohol + "<br/> Malic: " + d.Malic)
		     	.style("left", (d3.event.pageX + 10) + "px")
		     	.style("top", (d3.event.pageY - 20) + "px");
		     	})

.on("mouseout", function(d){
		     		tooltip.transition()
		     			.duration(500)
		     			.style("opacity",0);
		     	});

var legend = svg.selectAll(".legend")
      .data(color.domain())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });

legend.append("rect")
      .attr("x", width - 18)
      .attr("width", 18)
      .attr("height", 18)
      .style("fill", color);

legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9)
      .attr("dy", ".35em")
      .style("text-anchor", "end")
      .text(function(d) { return d; });

});

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js