Swiftmap labels polygons by finding each one's pole of inaccessibility or, in the case of complex multipolygons, its centroid.
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April 30, 2018 20:24
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Swiftmap Polygon Labels
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| font-family: "Helvetica Neue", sans-serif; | |
| } | |
| #map { | |
| width: 100%; | |
| height: 100vh; | |
| } | |
| .label { | |
| text-shadow: 1px 1px 1px #fff, 0 -1px 0 #eee, -1px 0 0 #fff; | |
| fill: #000; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <!-- Use d3-request to load a TopoJSON file. --> | |
| <script src="https://d3js.org/d3-collection.v1.min.js"></script> | |
| <script src="https://d3js.org/d3-dispatch.v1.min.js"></script> | |
| <script src="https://d3js.org/d3-dsv.v1.min.js"></script> | |
| <script src="https://d3js.org/d3-request.v1.min.js"></script> | |
| <script src="https://unpkg.com/swiftmap@0.2.8/dist/swiftmap.min.js"></script> | |
| <script> | |
| d3.json("delhi_1997-2012_district.json", ready); | |
| function ready(error, districts){ | |
| var map = swiftmap.map("#map") | |
| .layerPolygons(districts) | |
| .draw() | |
| .drawLabels(d => d.properties.DISTRICT); | |
| window.onresize = () => map.resize(); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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