Example of map explained in maptimeLex Introduction to D3.js Web Mapping Through 7 Simple Maps.
A D3 map using topojson
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<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>A D3 map using topojson</title> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/queue-async/1.0.7/queue.min.js"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script> | |
<link href="http://fonts.googleapis.com/css?family=Montserrat" rel="stylesheet" type="text/css"> | |
<style> | |
body { | |
padding: 0; | |
margin: 0; | |
background: whitesmoke; | |
} | |
h1 { | |
position: absolute; | |
left: 20px; | |
top: 10px; | |
font-family: "Proxima Nova", Montserrat, sans-serif; | |
font-size: 2em; | |
font-weight: 100; | |
color: #005DAA; /* offical UK Kentucky blue */ | |
} | |
.county { | |
stroke: #fff; | |
fill:#005DAA; | |
} | |
</style> | |
</head> | |
<body> | |
<h1>Kentucky Counties</h1> | |
<script> | |
var width = 900, | |
height = 600; | |
var svg = d3.select( "body" ) | |
.append( "svg" ) | |
.attr( "width", width ) | |
.attr( "height", height ); | |
var projection = d3.geo.albers() | |
.center([0, 37.8]) | |
.rotate([85.8,0]) | |
.scale(8000) | |
.translate([width / 2, height / 2]); | |
var geoPath = d3.geo.path() | |
.projection(projection); | |
queue() | |
.defer(d3.json, "ky-counties.json") | |
.await(ready); | |
function ready(error, counties){ | |
svg.append("g") | |
.selectAll("path") | |
.data( topojson.feature(counties, counties.objects.counties).features) | |
.enter() | |
.append("path") | |
.attr( "d", geoPath ) | |
.attr("class","county"); | |
} | |
</script> | |
</body> | |
</html> |
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