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Plot vector points on a cropped raster image with d3.js
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| <!doctype html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <style media="screen"> | |
| body { | |
| margin: 0; | |
| } | |
| .supermarket { | |
| fill: red; | |
| stroke: #c00; | |
| } | |
| </style> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <div class="js-map map"></div> | |
| <script charset="utf-8"> | |
| var el = d3.select('.js-map'), | |
| // 150 DPI image | |
| width = 1743 / 2, | |
| // 150 DPI image | |
| height = 1421 / 2, | |
| // Exported bounds of raster image | |
| rasterBounds = [[-122.7895, 45.4394], [-122.5015, 45.6039]] | |
| var projection = d3.geo.mercator() | |
| .scale(1) | |
| .translate([0, 0]) | |
| var path = d3.geo.path() | |
| .projection(projection) | |
| var map = el.append('svg') | |
| .attr('width', width) | |
| .attr('height', height) | |
| map.append('image') | |
| .attr('xlink:href', 'raster.png') | |
| .attr('width', width) | |
| .attr('height', height) | |
| d3.json('supermarkets.json', function(err, data) { | |
| var b = [projection(rasterBounds[0]), projection(rasterBounds[1])], | |
| s = 1 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height), | |
| t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2] | |
| projection | |
| .scale(s) | |
| .translate(t) | |
| map.selectAll('.supermarket') | |
| .data(data.features) | |
| .enter().append('circle') | |
| .attr('class', 'supermarket') | |
| .attr('r', 2) | |
| .each(function(d) { | |
| var lonlat = projection(d.geometry.coordinates); | |
| d3.select(this) | |
| .attr('cx', lonlat[0]) | |
| .attr('cy', lonlat[1]) | |
| }) | |
| }) | |
| </script> | |
| </body> |
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