Template for countries.
Last active
September 10, 2015 16:52
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umbc countries
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<title>umbc countries</title> | |
<style> | |
body { | |
position: absolute; | |
margin: 0px; | |
} | |
svg { | |
background-color: #4682b4; | |
} | |
.info { | |
font-family: sans-serif; | |
color: #000; | |
position: absolute; | |
top: 450px; | |
left: 50px; | |
} | |
path { | |
fill: #555555; | |
stroke: #aaaaaa; | |
} | |
</style> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script> | |
<body> | |
<script> | |
var width = 960, height = 500; | |
var data; // declare a global variable | |
var layer = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.on("mousemove", mousemoved); | |
var info = d3.select("body").append("div") | |
.attr("class", "info"); | |
var projection = d3.geo.mercator(); | |
var path = d3.geo.path() | |
.projection(projection); | |
// If you use this URL, you won't need your own copy of the data. | |
var url = "https://gist.githubusercontent.com/pbogden/8c6bcd912f9edebab99d/raw/countries.json" | |
d3.json(url, plotCountries); | |
function plotCountries(error, json) { | |
// Create array of GeoJSON features -- this defines the global variable "data" | |
data = json.objects.ne_50m_admin_0_countries.geometries | |
.map(function(d) { return topojson.feature(json, d); }); | |
// Put your code here | |
// Plot the features | |
layer.selectAll("path") | |
.data(data) | |
.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> |
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