D3 geo lines, circles and graticule.
From D3 in Depth book by Peter Cook.
Last active
March 31, 2021 06:20
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D3 geo lines, circles and graticule
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| license: gpl-3.0 | |
| height: 420 | |
| border: no |
This file contains 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
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>Geo shapes</title> | |
| </head> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, sans-serif; | |
| font-size: 14px; | |
| color: #333; | |
| } | |
| </style> | |
| <body> | |
| <div id="content"> | |
| <canvas width="800" height="400"></canvas> | |
| </div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"></script> | |
| <script> | |
| var context = d3.select('#content canvas') | |
| .node() | |
| .getContext('2d'); | |
| var projection = d3.geoOrthographic() | |
| .scale(500) | |
| .rotate([30, -45]); | |
| var geoGenerator = d3.geoPath() | |
| .projection(projection) | |
| .context(context); | |
| function update(geojson) { | |
| context.lineWidth = 0.5; | |
| context.strokeStyle = '#333'; | |
| context.beginPath(); | |
| geoGenerator({type: 'FeatureCollection', features: geojson.features}) | |
| context.stroke(); | |
| // Graticule | |
| var graticule = d3.geoGraticule(); | |
| context.beginPath(); | |
| context.strokeStyle = '#ccc'; | |
| geoGenerator(graticule()); | |
| context.stroke(); | |
| // London - New York | |
| context.beginPath(); | |
| context.strokeStyle = 'red'; | |
| geoGenerator({type: 'Feature', geometry: {type: 'LineString', coordinates: [[0.1278, 51.5074], [-74.0059, 40.7128]]}}); | |
| context.stroke(); | |
| // Circle | |
| var circle = d3.geoCircle().center([0.1278, 51.5074]).radius(5) | |
| context.beginPath(); | |
| context.strokeStyle = 'red'; | |
| geoGenerator(circle()); | |
| context.stroke(); | |
| } | |
| // REQUEST DATA | |
| d3.json('https://gist.githubusercontent.com/d3indepth/f28e1c3a99ea6d84986f35ac8646fac7/raw/c58cede8dab4673c91a3db702d50f7447b373d98/ne_110m_land.json', function(err, json) { | |
| update(json) | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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