Class 3

Assignment for Class #3

forked from pbogden's block: Class 3

<!DOCTYPE html>
<meta charset="utf-8">
<title>Class 3</title>
<style>

body {
  position: absolute;
  margin: 0px;
}

svg {
  background-color: #4682b4;
}

.info {
  font-family: sans-serif;
  color: #000;
  position: absolute;
  top: 450px;
  left: 800px;
}

path {
  fill: #555555;
  stroke: #eeeeee;
}

path.quake {
  fill: crimson;
}

</style>

var width = 960, height = 500;

var data;  // declare a global variable
var colors = d3.scaleOrdinal()
    .domain( ["A", "B", "C", "D"] )
    .range(["#fe9929", "#ec7014", "#cc4c02", "#8c2d04"]);

var legend = d3.legend()
    .translate([ width / 4 , height / 4 ])
    .colors(colors)
    .cb(function() { console.log("Done!"); });

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");
    layer2.call(legend); 
  
var info = d3.select("body").append("div")
    .attr("class", "info");

var projection = d3.geoAlbersUsa();

var path = d3.geoPath()
    .projection(projection);

// Read and plot the earthquake data
var usgs = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.geojson";
d3.json(usgs, plotQuakes);

// Read and plot the state & county boundaries
var url = "https://umbcvis.github.io/classes/class-03/us.json"
d3.json(url, plotStates);

function plotQuakes(error, json) {
  if (error) return console.log(error);

// Global variable, data, will be visible in the console
  data = json;

// Extract an array of feature objects, one for each earthquake
  var features = json.features;

// Plot the earthquakes
  layer2.selectAll("path.quake")
      .data(features)
    .enter().append("path")
      .attr("class", "quake")
      .attr("d", path)
}

function plotStates(error, json) {
  if (error) return console.log(error);

// Create array of GeoJSON features -- this defines the global variable "data"
  var features = topojson.feature(json, json.objects.us).features;

// Plot the features
  layer1.selectAll("path")
      .data(features)
    .enter()
      .append("path")
      .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