d3.geoInterpolate example.
From D3 in Depth book by Peter Cook.
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April 25, 2024 22:26
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d3.geoInterpolate example
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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.
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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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