Mapping of Toronto Neighbourhoods with TopoJSON and D3.js
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- TopoJSON, GeoJSON and Shp files of Toronto neighbourhoods can be found in my repo jasonicarter
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November 1, 2022 15:43
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Mapping of Toronto Neighbourhoods with TopoJSON and D3.js
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| <!DOCTYPE html> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <style type="text/css"> | |
| .wrapper { | |
| margin-left: auto; | |
| margin-right: auto; | |
| width: 800px; | |
| } | |
| .map_mesh { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| stroke-linejoin: round; | |
| } | |
| .map_outline { | |
| fill: #ddd; | |
| stroke: #000; | |
| stroke-width: 1.5px; | |
| } | |
| .map_neighbourhood { | |
| fill: #1f77b4; | |
| } | |
| .map_neighbourhood:hover { | |
| fill: #636363; | |
| cursor: pointer; | |
| } | |
| </style> | |
| <!-- center svg in div --> | |
| <div class="wrapper"></div> | |
| <script> | |
| // With help from - http://bl.ocks.org/michellechandra/0b2ce4923dc9b5809922 | |
| var mapWidth = 550, | |
| mapHeight = 550; | |
| var c10 = d3.scale.category10(); | |
| var projection = d3.geo.albers(); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3.select(".wrapper").append("svg") | |
| .attr("width", mapWidth) | |
| .attr("height", mapHeight); | |
| var mapLabel = svg.append("text") | |
| .attr("y", 20) | |
| .attr("x", 0) | |
| .attr("class", "map_neighbourhood_name") | |
| // load TopoJSON file | |
| d3.json("toronto_topo.json", function(error, toronto) { | |
| if (error) throw error; | |
| var neighbourhoods = topojson.feature(toronto, toronto.objects.toronto); | |
| // set default projection values | |
| projection | |
| .scale(1) | |
| .translate([0, 0]); | |
| // creates bounding box and helps with projection and scaling | |
| var b = path.bounds(neighbourhoods), | |
| s = .95 / Math.max((b[1][0] - b[0][0]) / mapWidth, (b[1][1] - b[0][1]) / mapHeight), | |
| t = [(mapWidth - s * (b[1][0] + b[0][0])) / 2, (mapHeight - s * (b[1][1] + b[0][1])) / 2]; | |
| // set project with bounding box data | |
| projection | |
| .scale(s) | |
| .translate(t); | |
| // get individual neighbourhoods | |
| svg.selectAll("path") | |
| .data(neighbourhoods.features) | |
| .enter().append("path") | |
| .attr("class", "map_neighbourhood") | |
| .attr("d", path) | |
| .on("mouseover", mouseover) | |
| .on("mouseout", mouseout) | |
| .on("click", clicked) | |
| // add the mesh/path between neighbourhoods | |
| svg.append("path") | |
| .datum(topojson.mesh(toronto, toronto.objects.toronto, function(a, b) { return a !== b; })) | |
| .attr("class", "map_mesh") | |
| .attr("d", path); | |
| }); | |
| function mouseover(d) { | |
| mapLabel.text(d.properties.name.slice(0,-5)) // remove suffix id from name | |
| } | |
| function mouseout(d) { | |
| mapLabel.text("") // remove out name | |
| } | |
| function clicked(d) { | |
| console.log(d.properties.id, d.properties.name) // verify everything looks good | |
| // Add code here | |
| } | |
| </script> | |
| </body> | |
| </html> |
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