An example of using GeoJSON data and a Voronoi map for hovers.
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August 29, 2015 14:02
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GeoJSON Voronoi
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| .stop { | |
| fill: #C83D2D; | |
| stroke: #C83D2D; | |
| stroke-width: 0.01px; | |
| } | |
| .stop.active { | |
| stroke-width: 0.05px; | |
| } | |
| .voronoi-stops { | |
| fill: transparent; | |
| stroke-width: 0.001; | |
| stroke: #676767; | |
| } | |
| .text-tooltip { | |
| position: absolute; | |
| top: 0; | |
| right: 0; | |
| margin: 1em 1em 0 0; | |
| padding: 1em; | |
| font-size: 1.5em; | |
| background-color: #F2F2F2; | |
| border: 1px solid #222222; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| d3.json('metrotransit-green-line-stops.geo.json', function(error, stops) { | |
| var width = 960; | |
| var height = 500; | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| // Make projection and path handler | |
| var projectionData = stops; | |
| var centroid = d3.geo.centroid(projectionData); | |
| var projection = d3.geo.albersUsa() | |
| .scale(1000) | |
| .translate([width / 2, height / 2]); | |
| var projectionPath = d3.geo.path().projection(projection) | |
| .pointRadius(function(d) { return 0.002; }); | |
| // Make group for features | |
| var featureGroup = svg.append('g').attr('class', 'feature-group'); | |
| // Fit map to data | |
| var b = projectionPath.bounds(projectionData); | |
| featureGroup.attr('transform', | |
| 'translate(' + projection.translate() + ') ' + | |
| 'scale(' + 0.95 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height) + ') ' + | |
| 'translate(' + -(b[1][0] + b[0][0]) / 2 + ',' + -(b[1][1] + b[0][1]) / 2 + ')'); | |
| // Add stops | |
| featureGroup.selectAll('.stop') | |
| .data(stops.features) | |
| .enter().append('path') | |
| .attr('class', 'stop') | |
| .attr('d', function(d) { | |
| // Attach this path to data | |
| d.stopPath = this; | |
| return projectionPath(d); | |
| }); | |
| // Make Voronoi map for hovering over stop | |
| var text = d3.select('body').append('div').attr('class', 'text-tooltip'); | |
| var voronoiStops = d3.geom.voronoi() | |
| .x(function(d) { return projection(d.geometry.coordinates)[0]; }) | |
| .y(function(d) { return projection(d.geometry.coordinates)[1]; }) | |
| .clipExtent([[0, 0], [width, height]]); | |
| featureGroup.selectAll('.voronoi-stops') | |
| .data(voronoiStops(stops.features)) | |
| .enter().append('path') | |
| .attr('class', 'voronoi-stops') | |
| .attr('d', function(d) { return 'M' + d.join('L') + 'Z'; }) | |
| .on('mouseover', function(d) { | |
| text.style('display', 'block') | |
| .text(d.point.properties.Station); | |
| d3.select(d.point.stopPath).classed('active', true); | |
| }) | |
| .on('mouseout', function(d) { | |
| text.style('display', 'none') | |
| .text(''); | |
| d3.select(d.point.stopPath).classed('active', false); | |
| }); | |
| }); | |
| </script> | |
| </body> |
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