.fitExtent() example
From D3 in Depth book by Peter Cook.
Last active
August 2, 2017 11:27
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.fitExtent() example
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| license: gpl-3.0 | |
| height: 480 | |
| border: no |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>Geo (projection fitExtent)</title> | |
| </head> | |
| <style> | |
| body { | |
| font-family: "Helvetica Neue", Helvetica, sans-serif; | |
| font-size: 14px; | |
| color: #333; | |
| } | |
| canvas { | |
| margin: 10px; | |
| background-color: #eee; | |
| } | |
| </style> | |
| <body> | |
| <div id="content"> | |
| <canvas width="640" height="440"></canvas> | |
| </div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.9.1/d3.min.js"></script> | |
| <script> | |
| var context = d3.select('#content canvas') | |
| .node() | |
| .getContext('2d'); | |
| var projection = d3.geoEquirectangular(); | |
| var geoGenerator = d3.geoPath() | |
| .projection(projection) | |
| .context(context); | |
| function update(geojson) { | |
| projection.fitExtent([[20, 20], [620, 420]], geojson); | |
| context.lineWidth = 0.5; | |
| context.strokeStyle = '#888'; | |
| context.beginPath(); | |
| geoGenerator({type: 'FeatureCollection', features: geojson.features}) | |
| context.stroke(); | |
| // extent border | |
| context.beginPath(); | |
| context.setLineDash([2, 2]); | |
| context.rect(20, 20, 600, 400); | |
| 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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