D3 Examples - Class 6 ScatterPlot

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<!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: #000;
}
  .dot:hover {
  fill: red;
}
​
</style>
<body>
​
<!-- load the d3.js library -->     
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
// parse the date / time
​
  var parseTime = d3.utcParse("%Y-%m-%dT%H:%M:%S.%LZ")
// set the ranges
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
// define the line
var valueline = d3.line()
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.close); });
// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");
// Get the data
var url = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.csv";
d3.csv(url, function(error, data) {
  if (error) throw error;
  // format the data
  data.forEach(function(d) {
      d.time = parseTime(d.time);
      d.mag = +d.mag;
  });
  // Scale the range of the data
  x.domain(d3.extent(data, function(d) { return d.time; }));
  y.domain([0, d3.max(data, function(d) { return d.mag; })]);
  // Add the valueline path.
  svg.append("path")
      .data([data])
      .attr("class", "line")
      .attr("d", valueline);
      
  // Add the scatterplot
  svg.selectAll("dot")
      .data(data)
    .enter().append("circle")
      .attr("r", 3.5)
      .attr("cx", function(d) { return x(d.time); })
      .attr("cy", function(d) { return y(d.mag); });
  // Add the X Axis
  svg.append("g")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));
  // Add the Y Axis
  svg.append("g")
      .call(d3.axisLeft(y));
​
     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>
</body>
    