This is the code for Chapter 7, Figure 12 from D3.js in Action showing how to create a globe using the d3.geo.orthographic() projection as well as a modified zoom that changes the rotate of the projection based on mouse behavior.
Last active
March 17, 2016 16:23
-
-
Save emeeks/b3db5feea1bd13611b20 to your computer and use it in GitHub Desktop.
Ch. 7 Fig. 12 - D3.js in Action
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
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 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<html> | |
<head> | |
<title>D3 in Action Chapter 7 - Example 5</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.orthographic() | |
.scale(200) | |
.translate([width / 2, height / 2]) | |
.clipAngle(90); | |
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); | |
var rotateScale = d3.scale.linear() | |
.domain([0, width]) | |
.range([-180, 180]); | |
d3.select("svg").on("mousedown", startRotating).on("mouseup", stopRotating); | |
function startRotating() { | |
d3.select("svg").on("mousemove", function() { | |
var p = d3.mouse(this); | |
projection.rotate([rotateScale(p[0]), 0]); | |
zoomed(); | |
}); | |
} | |
function stopRotating() { | |
d3.select("svg").on("mousemove", null); | |
} | |
function zoomed() { | |
var currentRotate = projection.rotate()[0]; | |
projection.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 < 90 && parseInt(d.y) + currentRotate > -90 ? "block" : "none"}) | |
} | |
function zoomButton(zoomDirection) { | |
if (zoomDirection == "in") { | |
var newZoom = mapZoom.scale() * 1.5; | |
var newX = ((mapZoom.translate()[0] - (width / 2)) * 1.5) + width / 2; | |
var newY = ((mapZoom.translate()[1] - (height / 2)) * 1.5) + height / 2; | |
} | |
else if (zoomDirection == "out") { | |
var newZoom = mapZoom.scale() * .75; | |
var newX = ((mapZoom.translate()[0] - (width / 2)) * .75) + width / 2; | |
var newY = ((mapZoom.translate()[1] - (height / 2)) * .75) + height / 2; | |
} | |
mapZoom.scale(newZoom).translate([newX,newY]) | |
zoomed(); | |
} | |
d3.select("#controls").append("button").on("click", function () {zoomButton("in")}).html("Zoom In"); | |
d3.select("#controls").append("button").on("click", function () {zoomButton("out")}).html("Zoom Out"); | |
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) | |
.on("mouseover", centerBounds) | |
.on("mouseout", clearCenterBounds) | |
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]}) | |
function centerBounds(d,i) { | |
thisBounds = geoPath.bounds(d); | |
thisCenter = geoPath.centroid(d); | |
d3.select("svg") | |
.append("rect") | |
.attr("class", "bbox") | |
.attr("x", thisBounds[0][0]) | |
.attr("y", thisBounds[0][1]) | |
.attr("width", thisBounds[1][0] - thisBounds[0][0]) | |
.attr("height", thisBounds[1][1] - thisBounds[0][1]) | |
.style("fill", "none") | |
.style("stroke-dasharray", "5 5") | |
.style("stroke", "black") | |
.style("stroke-width", 2) | |
.style("pointer-events", "none") | |
d3.select("svg") | |
.append("circle") | |
.attr("class", "centroid") | |
.attr("r", 5) | |
.attr("cx", thisCenter[0]).attr("cy", thisCenter[1]) | |
.style("pointer-events", "none") | |
} | |
function clearCenterBounds() { | |
d3.selectAll("circle.centroid").remove(); | |
d3.selectAll("rect.bbox").remove(); | |
} | |
} | |
</script> | |
</footer> | |
</html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment