d3.geoInterpolate example.
From D3 in Depth book by Peter Cook.
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June 13, 2025 15:02
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d3.geoInterpolate example
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| license: gpl-3.0 | |
| height: 420 | |
| border: no |
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.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>Geo interpolator</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 geojson = {} | |
| var context = d3.select('#content canvas') | |
| .node() | |
| .getContext('2d'); | |
| var projection = d3.geoOrthographic() | |
| .scale(500) | |
| .rotate([30, -45]); | |
| var geoGenerator = d3.geoPath() | |
| .projection(projection) | |
| .pointRadius(4) | |
| .context(context); | |
| var londonLonLat = [0.1278, 51.5074]; | |
| var newYorkLonLat = [-74.0059, 40.7128]; | |
| var geoInterpolator = d3.geoInterpolate(londonLonLat, newYorkLonLat); | |
| var u = 0; | |
| function update() { | |
| context.clearRect(0, 0, 800, 600); | |
| 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: [londonLonLat, newYorkLonLat]}}); | |
| context.stroke(); | |
| // Point | |
| context.beginPath(); | |
| context.fillStyle = 'red'; | |
| geoGenerator({type: 'Feature', geometry: {type: 'Point', coordinates: geoInterpolator(u)}}); | |
| context.fill(); | |
| u += 0.01 | |
| if(u > 1) u = 0 | |
| } | |
| // REQUEST DATA | |
| d3.json('https://gist.githubusercontent.com/d3indepth/f28e1c3a99ea6d84986f35ac8646fac7/raw/c58cede8dab4673c91a3db702d50f7447b373d98/ne_110m_land.json', function(err, json) { | |
| geojson = json; | |
| window.setInterval(update, 50); | |
| // update(json); | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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