This is an example of using D3's geo paths to render a MultiLineString, but it seems to not render correctly for whatever reason. It is not a fill/stroke problem, either.
Identified problem: It seems that the stroke width gets scaled as well.
Last active
August 29, 2015 14:01
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D3 MultiLineString Example
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| </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('data.topojson', function(error, route) { | |
| var width = 960; | |
| var height = 500; | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| route = topojson.feature(route, route.objects['metrotransit-green-line.geo']); | |
| // Make projection and path handler | |
| var projectionData = route; | |
| 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); | |
| // 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 data | |
| featureGroup.selectAll('.route') | |
| .data(route.features) | |
| .enter() | |
| .append('path') | |
| .attr('class', 'route') | |
| .attr('d', projectionPath) | |
| .style('fill', 'blue') | |
| .style('fill-opacity', 0.05) | |
| .style('stroke', 'red') | |
| .style('stroke-opacity', 0.75) | |
| .style('stroke-width', 0.001); | |
| }); | |
| </script> | |
| </body> |
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