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Display roads in paris from a topojson file using D3
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| #map { | |
| width: 960px; | |
| height: 500px; | |
| } | |
| .roads { | |
| stroke: black; | |
| fill: none; | |
| } | |
| .overlay { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| </style> | |
| <body> | |
| <div id="map"></div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var initialZoom = 295; | |
| var initialPos = [-205.49548429098172, -14197.978760832331]; | |
| var path = d3.geo.path().projection(null); | |
| var zoom = d3.behavior.zoom() | |
| .translate(initialPos) | |
| .scale(initialZoom) | |
| .on("zoom", zoomed); | |
| var svg = d3.select("#map").append("svg").attr("height", height).attr("width", width); | |
| var features = svg.append("g").attr("transform","translate("+ initialPos[0] + "," + initialPos[1] + ")scale(" + initialZoom + ")"); | |
| svg.append("rect") | |
| .attr("class", "overlay") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .call(zoom); | |
| d3.json("paris.topojson", function(error, data) { | |
| features.append("path") | |
| .datum(topojson.feature(data, data.objects.roads)) | |
| .attr("class", "roads") | |
| .attr("d", path) | |
| .style("stroke-width", .5/initialZoom + "px"); | |
| }); | |
| function zoomed() { | |
| console.log(d3.event.scale); | |
| console.log(d3.event.translate); | |
| features.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")"); | |
| features.select(".roads").style("stroke-width", .5 / d3.event.scale + "px"); | |
| } | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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