D3 geo simple example rendered onto canvas element.
From D3 in Depth book by Peter Cook.
Last active
September 25, 2019 03:58
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D3 geo basic example (canvas)
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| license: gpl-3.0 | |
| height: 420 | |
| border: no |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>Basic geo (canvas)</title> | |
| </head> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, sans-serif; | |
| font-size: 14px; | |
| color: #333; | |
| } | |
| #content .map path { | |
| fill: #ddd; | |
| stroke: #aaa; | |
| } | |
| </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 geojson = { | |
| "type": "FeatureCollection", | |
| "features": [ | |
| { | |
| "type": "Feature", | |
| "properties": { | |
| "name": "Africa" | |
| }, | |
| "geometry": { | |
| "type": "Polygon", | |
| "coordinates": [[[-6, 36], [33, 30], [43, 11], [51, 12], [29, -33], [18, -35], [7, 5], [-17, 14], [-6, 36]]] | |
| } | |
| }, | |
| { | |
| "type": "Feature", | |
| "properties": { | |
| "name": "Australia" | |
| }, | |
| "geometry": { | |
| "type": "Polygon", | |
| "coordinates": [[[143, -11], [153, -28], [144, -38], [131, -31], [116, -35], [114, -22], [136, -12], [140, -17], [143, -11]]] | |
| } | |
| }, | |
| { | |
| "type": "Feature", | |
| "properties": { | |
| "name": "Timbuktu" | |
| }, | |
| "geometry": { | |
| "type": "Point", | |
| "coordinates": [-3.0026, 16.7666] | |
| } | |
| } | |
| ] | |
| }; | |
| var context = d3.select('#content canvas') | |
| .node() | |
| .getContext('2d'); | |
| var projection = d3.geoEquirectangular() | |
| .scale(200) | |
| .translate([200, 150]); | |
| var geoGenerator = d3.geoPath() | |
| .projection(projection) | |
| .context(context); | |
| function update(geojson) { | |
| context.lineWidth = 0.5; | |
| context.strokeStyle = '#aaa'; | |
| context.beginPath(); | |
| geoGenerator({type: 'FeatureCollection', features: geojson.features}) | |
| context.stroke(); | |
| } | |
| update(geojson); | |
| </script> | |
| </body> | |
| </html> |
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