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Last active March 17, 2016 16:23
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Ch. 7, Fig. 15 - D3.js in Action
Raw
readme.md

This is the code for Chapter 7, Figure 15 from D3.js in Action showing how to create an isometric map using the d3.geo.satellite() projection.

Raw
cities.csv
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
Raw
index.html
<html>
<head>
<title>D3 in Action Chapter 7 - Example 6</title>
<meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<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="https://d3js.org/colorbrewer.v1.min.js" type="text/JavaScript"></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>
<div id="controls" />
</body>
<footer>
<script>
queue()
.defer(d3.json, "world.geojson")
.defer(d3.csv, "cities.csv")
.await(function(error, file1, file2) { createMap(file1, file2); });
function createMap(countries, cities) {
expData = countries;
width = 500;
height = 500;
projection = d3.geo.satellite()
.scale(1330)
.translate([250,250])
.rotate([-30.24, -31, -56])
.tilt(30)
.distance(1.199)
.clipAngle(45)
geoPath = d3.geo.path().projection(projection);
var mapZoom = d3.behavior.zoom().translate(projection.translate()).scale(projection.scale()).on("zoom", zoomed);
d3.select("svg").call(mapZoom);
function zoomed() {
var currentRotate = projection.rotate()[0];
projection.translate(mapZoom.translate()).scale(mapZoom.scale());
d3.selectAll("path.graticule").attr("d", geoPath);
d3.selectAll("path.countries").attr("d", geoPath);
d3.selectAll("circle.cities")
.attr("cx", function(d) {return projection([d.y,d.x])[0]})
.attr("cy", function(d) {return projection([d.y,d.x])[1]})
.style("display", function(d) {return parseInt(d.y) + currentRotate < 45 && parseInt(d.y) + currentRotate > -45 ? "block" : "none"})
}
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").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)
d3.select("svg").selectAll("circle").data(cities)
.enter()
.append("circle")
.attr("class", "cities")
.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]})
.style("display", function(d) {return parseInt(d.y) -30.24 < 45 && parseInt(d.y) -30.24 > -45 ? "block" : "none"})
}
</script>
</footer>
</html>
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