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class 3 - states// source http://jsbin.com/kewesapuna
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<title>class 3 - states</title> | |
<style> | |
body { | |
position: absolute; | |
margin: 0px; | |
} | |
svg { | |
background-color: none; | |
} | |
.info { | |
font-family: sans-serif; | |
color: blue; | |
position: absolute; | |
top: 450px; | |
left: 800px; | |
} | |
path.quake, circle.quake { | |
fill: red; | |
fill-opacity: 0.9; | |
} | |
path.state { | |
fill: none; | |
stroke: #000; | |
} | |
path { | |
fill: none; | |
stroke: black; | |
} | |
</style> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script src="https://d3js.org/topojson.v2.min.js"></script> | |
<body> | |
<script> | |
var width = 960, height = 500; | |
var data; | |
var data2; | |
var info = d3.select("body").append("div") | |
.attr("class", "info"); | |
var projection = d3.geoAlbersUsa(); | |
var path = d3.geoPath() | |
.projection(projection); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
var layer1 = svg.append("g"); | |
var layer2 = svg.append("g"); | |
var quakes = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_day.geojson"; | |
var url = "https://umbcvis.github.io/classes/class-03/us.json"; | |
d3.json(url, plotStates); | |
d3.json(quakes, plotQuakes); | |
function plotStates(error, json) | |
{ | |
data = json.objects.us.geometries.map(function(d) { return topojson.feature(json, d); }); | |
layer2.selectAll("path.state") | |
.data(data) | |
.enter() | |
.append("path") | |
.attr("class", "state") | |
.attr("d", path) | |
} | |
function plotQuakes(error, json) | |
{ | |
data2 = json; | |
var features = data2.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> | |
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