Visualizing Vietname population density by provinces/cities.
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November 17, 2016 22:33
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Vietname population density by provinces/cities
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Vietnam Population by Provinces</title> | |
| <meta charset="utf-8"> | |
| <style> | |
| .boundary { | |
| fill: none; | |
| stroke: #777; | |
| stroke-dasharray: 2,2; | |
| stroke-linejoin: round; | |
| } | |
| path { | |
| stroke: white; | |
| stroke-width: 0.1px; | |
| } | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| </style> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/queue.v1.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| </head> | |
| <body> | |
| <script src="population_density_map.js"></script> | |
| </body> | |
| </html> |
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| var width = 960, | |
| height = 1160, | |
| centered; | |
| var densityById = d3.map(); | |
| var scale = d3.scale | |
| .linear() | |
| .domain([0,3731]) | |
| .range([0,1]); | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| queue() | |
| .defer(d3.json,"vietnam_adm2.json") | |
| .defer(d3.csv, | |
| "vietnam_population_by_province.csv", | |
| function(d){ | |
| densityById.set(d.id,d.density); | |
| } | |
| ) | |
| .await(ready); | |
| function ready(error, topojsonFile, data) { | |
| svg.append("rect") | |
| .attr("class","background") | |
| .attr("width",width) | |
| .attr("height",height) | |
| .on("click", clicked); | |
| var projection = d3.geo.mercator() | |
| .center([107,11]) | |
| .scale(2490) | |
| .translate([width/2,height/2]); | |
| var path = d3.geo.path().projection(projection); | |
| var provinces = topojson.feature(topojsonFile, topojsonFile.objects.VNM_adm2).features; | |
| var g = svg.append("g"); | |
| g.append("g") | |
| .selectAll("path") | |
| .data(provinces) | |
| .enter() | |
| .append("path") | |
| .attr("fill", function(d) { console.log(d); return "rgba(0, 0, 255, " + scale(densityById.get(d.id)) + ")"; }) | |
| .attr("id",function(d) { return d.id;}) | |
| .attr("d",path) | |
| .on("click",clicked); | |
| function clicked(d) { | |
| var x, y, k; | |
| if ( d && centered !== d) { | |
| var centroid = path.centroid(d); | |
| x = centroid[0]; | |
| y = centroid[1]; | |
| k = 9; | |
| centered = d; | |
| } | |
| else { | |
| x = width/2; | |
| y = height/2; | |
| k = 1; | |
| centered = null; | |
| } | |
| g.selectAll("path") | |
| .classed("active", centered && function(d) { return d === centered; }); | |
| g.transition() | |
| .duration(750) | |
| .attr("transform","translate(" + width/2 + "," + height/2 + ")scale(" + k + ")translate("+ -x +"," + -y + ")") | |
| .style("stroke-width", 1.5/k + "px"); | |
| } | |
| } |
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