This is the code for Chapter 7, Figure 19 from D3.js in Action which shows how to use topojson.neighbors().
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Ch. 7, Fig. 19 - D3.js in Action
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label | population | country | x | y | |
---|---|---|---|---|---|
San Francisco | 750000 | USA | 37 | -122 | |
Fresno | 500000 | USA | 36 | -119 | |
Lahore | 12500000 | Pakistan | 31 | 74 | |
Karachi | 13000000 | Pakistan | 24 | 67 | |
Rome | 2500000 | Italy | 41 | 12 | |
Naples | 1000000 | Italy | 40 | 14 | |
Rio | 12300000 | Brazil | -22 | -43 | |
Sao Paolo | 12300000 | Brazil | -23 | -46 |
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<html> | |
<head> | |
<title>D3 in Action Chapter 7 - Example 9</title> | |
<meta charset="utf-8" /> | |
<script src="https://d3js.org/d3.geo.projection.v0.min.js" type="text/JavaScript"></script> | |
<script src="https://d3js.org/queue.v1.min.js" type="text/JavaScript"></script> | |
<script src="http://d3js.org/colorbrewer.v1.min.js" type="text/JavaScript"></script> | |
<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> | |
</head> | |
<style> | |
svg { | |
height: 500px; | |
width: 500px; | |
border: 1px solid gray; | |
} | |
.countries { | |
fill: red; | |
fill-opacity: .5; | |
stroke: black; | |
stroke-width: 1px; | |
} | |
</style> | |
<body> | |
<div id="viz"> | |
<svg> | |
</svg> | |
</div> | |
</body> | |
<footer> | |
<script> | |
queue() | |
.defer(d3.json, "world.topojson") | |
.defer(d3.csv, "cities.csv") | |
.await(function(error, file1, file2) { createMap(file1, file2); }); | |
function createMap(countries1, cities) { | |
var countries = topojson.feature(countries1, countries1.objects.countries); | |
var neighbors = topojson.neighbors(countries1.objects.countries.geometries); | |
width = 500; | |
height = 500; | |
projection = d3.geo.mollweide() | |
.scale(120) | |
.translate([width / 2, height / 2]) | |
.center([20,0]) | |
geoPath = d3.geo.path().projection(projection); | |
featureSize = d3.extent(countries.features, function(d) {return geoPath.area(d)}); | |
countryColor = d3.scale.quantize().domain(featureSize).range(colorbrewer.Reds[7]); | |
var graticule = d3.geo.graticule(); | |
d3.select("svg").append("path") | |
.datum(graticule) | |
.attr("class", "graticule line") | |
.attr("d", geoPath) | |
.style("fill", "none") | |
.style("stroke", "lightgray") | |
.style("stroke-width", "1px"); | |
d3.select("svg").append("path") | |
.datum(graticule.outline) | |
.attr("class", "graticule outline") | |
.attr("d", geoPath) | |
.style("fill", "none") | |
.style("stroke", "black") | |
.style("stroke-width", "1px"); | |
d3.select("svg").selectAll("path.countries").data(countries.features) | |
.enter() | |
.append("path") | |
.attr("d", geoPath) | |
.attr("class", "countries") | |
.style("fill", function(d) {return countryColor(geoPath.area(d))}) | |
.style("stroke-width", 1) | |
.style("stroke", "black") | |
.style("opacity", .5) | |
.on("mouseover", centerBounds) | |
.on("mouseout", clearCenterBounds) | |
d3.select("svg").selectAll("circle").data(cities) | |
.enter() | |
.append("circle") | |
.style("fill", "black") | |
.style("stroke", "white") | |
.style("stroke-width", 1) | |
.attr("r", 3) | |
.attr("cx", function(d) {return projection([d.y,d.x])[0]}) | |
.attr("cy", function(d) {return projection([d.y,d.x])[1]}) | |
function centerBounds(d,i) { | |
d3.select(this).style("fill", "blue") | |
d3.selectAll("path.countries").filter(function (p,q) {return neighbors[i].indexOf(q) > -1}).style("fill", "green") | |
} | |
function clearCenterBounds() { | |
d3.selectAll("path.countries") | |
.style("fill", function(d) {return countryColor(geoPath.area(d))}) | |
} | |
} | |
</script> | |
</footer> | |
</html> |
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