Example of map explained in maptimeLex Introduction to D3.js Web Mapping Through 7 Simple Maps.
Last active
May 14, 2023 20:26
-
-
Save rgdonohue/530c5bfab3a72a73232a to your computer and use it in GitHub Desktop.
A D3 map using topojson
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <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> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment