This small example was made to answer a quesition on the d3noob.org blog about how to add the names of the cities beside the dots.
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November 30, 2019 18:37
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Adding names to places
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| license: mit |
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| code | city | country | lat | lon | |
|---|---|---|---|---|---|
| ZNZ | ZANZIBAR | TANZANIA | -6.13 | 39.31 | |
| TYO | TOKYO | JAPAN | 35.68 | 139.76 | |
| AKL | AUCKLAND | NEW ZEALAND | -36.85 | 174.78 | |
| BKK | BANGKOK | THAILAND | 13.75 | 100.48 | |
| DEL | DELHI | INDIA | 29.01 | 77.38 | |
| SIN | SINGAPORE | SINGAPOR | 1.36 | 103.75 | |
| BSB | BRASILIA | BRAZIL | -15.67 | -47.43 | |
| RIO | RIO DE JANEIRO | BRAZIL | -22.90 | -43.24 | |
| YTO | TORONTO | CANADA | 43.64 | -79.40 | |
| IPC | EASTER ISLAND | CHILE | -27.11 | -109.36 | |
| SEA | SEATTLE | USA | 47.61 | -122.33 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| stroke: white; | |
| stroke-width: 0.25px; | |
| fill: grey; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v0.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.mercator() | |
| .center([0, 5 ]) | |
| .scale(200) | |
| .rotate([-180,0]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var g = svg.append("g"); | |
| // load and display the World | |
| d3.json("world-110m2.json", function(error, topology) { | |
| // load and display the cities | |
| d3.csv("cities.csv", function(error, data) { | |
| g.selectAll("circle") | |
| .data(data) | |
| .enter() | |
| .append("a") | |
| .attr("xlink:href", function(d) { | |
| return "https://www.google.com/search?q="+d.city;} | |
| ) | |
| .append("circle") | |
| .attr("cx", function(d) { | |
| return projection([d.lon, d.lat])[0]; | |
| }) | |
| .attr("cy", function(d) { | |
| return projection([d.lon, d.lat])[1]; | |
| }) | |
| .attr("r", 5) | |
| .style("fill", "red"); | |
| g.selectAll("text") | |
| .data(data) | |
| .enter() | |
| .append("text") // append text | |
| .attr("x", function(d) { | |
| return projection([d.lon, d.lat])[0]; | |
| }) | |
| .attr("y", function(d) { | |
| return projection([d.lon, d.lat])[1]; | |
| }) | |
| .attr("dy", -7) // set y position of bottom of text | |
| .style("fill", "black") // fill the text with the colour black | |
| .attr("text-anchor", "middle") // set anchor y justification | |
| .text(function(d) {return d.city;}); // define the text to display | |
| }); | |
| g.selectAll("path") | |
| .data(topojson.object(topology, topology.objects.countries) | |
| .geometries) | |
| .enter() | |
| .append("path") | |
| .attr("d", path) | |
| }); | |
| // zoom and pan | |
| var zoom = d3.behavior.zoom() | |
| .on("zoom",function() { | |
| g.attr("transform","translate("+ | |
| d3.event.translate.join(",")+")scale("+d3.event.scale+")"); | |
| g.selectAll("circle") | |
| .attr("d", path.projection(projection)); | |
| g.selectAll("path") | |
| .attr("d", path.projection(projection)); | |
| }); | |
| svg.call(zoom) | |
| </script> | |
| </body> | |
| </html> |
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