Assignment 7

<!DOCTYPE html>
<meta charset="utf-8">
<title>Class 5</title>
<style>
body {
  position: absolute;
  margin: 0px;
  font: 16px sans-serif;
}
svg {
  background-color: #4682b4;
}
.info {
  color: #000;
  position: absolute;
  top: 450px;
  left: 800px;
}
path {
  fill: #555555;
  stroke: #aaaaaa;
}
path.quake {
  fill: crimson;
}
</style>

<body>
<script>
var width = 960, height = 500;
var data;  // declare a global variable
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .on("mousemove", mousemoved);
var layer1 = svg.append("g");
var layer2 = svg.append("g");
var info = d3.select("body").append("div")
    .attr("class", "info");
  
 //counties
  d3.json("ok-counties.json", function(error, ok) {
  if (error) throw error;

var counties = topojson.feature(ok, ok.objects.counties);

svg.append("g")
      .attr("class", "counties")
    .selectAll("path")
      .data(counties.features)
    .enter().append("path")
      .attr('class', 'county')
      .attr("d", path);

svg.append("path")
      .datum(topojson.mesh(ok, ok.objects.counties, function(a, b) { return a !== b; }))
      .attr("class", "county-border")
      .attr("d", path);

svg.append("path")
      .datum(topojson.mesh(ok, ok.objects.counties, function(a, b) { return a === b; }))
      .attr("class", "state-border")
      .attr("d", path);
});

// NEW: Title
svg.append('text')
    .attr('x', width / 2)
    .attr('y', "1.5em")
    .style('font-size', '1.5em')
    .style('text-anchor', 'middle')
    .text('Earthquakes in the last week')

// Set the map projection centered on Oklahoma
var projection = d3.geoAlbersUsa()
    .scale(7543)
    .translate([702, -186]);
var path = d3.geoPath()
    .projection(projection);
// NEW: Create a color scale for the earthquakes
var color = d3.scaleOrdinal(d3.schemeCategory10);
  
// Add a legend

// Update the legend labels to indicate # of earthquakes in range
  legend.select('text')
      .text(function(value) { return value + ' - ' + (value + 1) + " (" +
           mags.filter(function(d) { return d >= value && d < value + 1; }).length + ")";
      });
}

// projection returns null for [lon, lat] that won't appear in the viewport
function inRange(d) {
  return projection(d.geometry.coordinates) !== null;
}
// NEW: Return magnitude-dependent color
function magColor(d) {
  return color(Math.floor(d.properties.mag));
}
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/d3-tile.v0.0.min.js

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