Homework 6 (Another way to do it)

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

<style>

.chart rect {
  fill: seagreen;
}

.legend {
  font: 10px sans-serif;
}

body {
  font: 12px sans-serif;
  font-weight: bold;
}
path {
  stroke:steelblue;
  stroke-width: 2;
  fill: none;
}

.axis text {
  font: 10px sans-serif;
}
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
.chart text {
  font: 12px sans-serif;
}

.dot {
  stroke: #000;
}

</style>

<body>

var url = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.geojson";

var margin = {top: 20, right: 30, bottom: 40, left: 40},
    width = 960 - margin.left - margin.right,
    height = 520 - margin.top - margin.bottom;

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

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

//Line generator
var line = d3.svg.line()
    .x(function(d) { return x(d.x); })
    .y(function(d) { return y(d.y); });

//Set colors based on 10 colors
var color = d3.scale.category10();

var xAxis = d3.svg.axis()
    .scale(x)
    //.tickValues ([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
    .orient("bottom");

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

var chart = d3.select(".chart")//.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 + ")");

//svg.call(tip);

d3.json(url, function(error, data) {
  if (error) console.log(error);
  console.log("Data from USGS:", data);
  quakes = data
  quakesMag = [];
  quakesMag = data.features.map(function(d) { return d.properties.mag; });
  console.log("Earthquake Magnitude:", quakesMag);
  quakesBin = []; // empty array to bin the mag values
  for (var i = 0; i < 10; i++) {
    quakesBin[i] = quakesMag.filter(function(d) { return d >= i && d < i + 1;}).length;
  }
  x.domain([0, quakesBin.length]);
  y.domain([d3.min(quakesBin, function(d) { return d; }), d3.max (quakesBin, function (d) { return d; })]);
  //y.domain(d3.extent(quakesBin));

//var barWith = width / quakesMag.length;

//Create x axis
  chart.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

//Append title for the Legend
  chart.append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -7)
      .style("text-anchor", "end")
      .text("Legend");

//Create x axis
  chart.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

//Append for x axis label
  chart.append("text")
      .attr("text-anchor", "middle")
      .attr("x", width/2)
      .attr("y", height + 27)
      .text("Earthquake Magnitude");

//Create y axis
  chart.append("g")
      .attr("class", "y axis")
      .call(yAxis);

//Append for y axis label
  chart.append("text")
      .attr("transform", "rotate(-90)")
      .attr("x", -height/2)
      .attr("y", -1 - margin.left/3)
      .attr("dy", "-1.2em")
      .attr("text-anchor", "middle")
      .text("Earthquake Frequency");

//Append for the Title
  chart.append("text")
      .attr("text-anchor", "middle")
      .attr("x", width/2)
      .attr("y", -margin.top/2)
      .attr("dy", ".5em")
      .text("Earthquake Occurences - Last 2.5 Days");

//Plot the dots
  chart.selectAll(".dot")
      .data(quakesBin)
      .enter().append("circle")
      .attr("class", "dot")
      .attr("r", 4) //Radius of 4
      .attr("cx", function(d, i) { return x(i); })
      .attr("cy", function(d) { return y(d); })
      //.attr("height", function(d) { return height - y(d); })
      //.attr("width", barWith)
      .style("fill", function(d) { return color(d); });

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

//Append Legend
  legend.append("rect")
      .attr("x", width - 20)
      .attr("width", 20)
      .attr("height", 20)
      .style("fill", color);

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

// Create an array of objects that will be plotted as a line
  var lineData = quakesBin.map(function(d, i) { 
      var obj = {};
      obj.x = i;
      obj.y = d;
      return obj;
  });

//Plot the data line
  chart.append("path")
      .datum(lineData)
      .attr("class", "line")
      .attr("d", line);
});

</script>

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

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