HOMEWORK3

<!doctype HTML>
<meta charset="utf-8">
<title>class 3</title>
<style>
body {
  position: absolute;
  margin: 0px;
}
svg {
  background-color: none;
}
.info {
  font-family: sans-serif;
  color: #000;
  position: absolute;
  top: 450px;
  left: 800px;
}
path {
  fill: #555555;
  stroke: #aaaaaa;
}
path.quake, circle.quake {
  fill: crimson;
  fill-opacity: 1;
}
path.state {
  fill: #F0E68C;
  stroke: #000;
}
}
</style>

<body>
<script>
var width = 960, height = 500;
var data = null; // This is a global variable
var usgs_data; // This is a global variable
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
var projection = d3.geoAlbersUsa();
var path = d3.geoPath()
    .projection(projection);
  
var layer2 = svg.append("g");	
var layer1 = svg.append("g");
var url = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/1.0_day.geojson";
var base = "https://umbcvis.github.io/classes/class-03/us.json"
d3.json(base, plotStates);
function plotStates(error, json) {
  if (error) console.log(error);
  
  // Assign the json to a global so we can manipulate it in the console
  usgs_data = json.objects.us.geometries.map(function(d) { return topojson.feature(json, d); })
  // Plot the States
  layer2.selectAll("path.state")
      .data(usgs_data)
    .enter().append("path")
      .attr("class", "state")
      .attr("d", path)
}
d3.json(url, plotQuakes);
function plotQuakes(error, json) {
  if (error) console.log(error);
data = json;
var features = data.features;
 layer1.selectAll("path.quake")
      .data(features)
    .enter().append("path")
      .attr("class", "quake")
      .attr("d", path)
} 
function mousemoved() {
  info.text(formatLocation(projection.invert(d3.mouse(this)), projection.scale()));
}
function formatLocation(p, k) {
  var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f");
  return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " "
       + (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E");
}
</script>

https://d3js.org/d3.v4.min.js

https://d3js.org/topojson.v2.min.js