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Last active June 30, 2017 20:35
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Chicago Ward Shape Transitions
license: mit
height: 800
border: no

Chicago Ward Shape Transitions

Example representing Chicago wards as a cartogram, boundaries, and bar chart with path tween transitions. Using a modified version of the Wall Street Journal's Squaire library and MinnPost's aRanger to produce the cartogram layout.

license: mit
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]
}
<!DOCTYPE html>
<html>
<head>
<title>D3 Maps</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta charset='utf-8' />
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-queue.v3.min.js"></script>
<script src="http://d3js.org/colorbrewer.v1.min.js"></script>
<style>
* {
font-family: "Verdana";
font-size: 10;
}
#container {
margin-left: 15px;
margin-top: 15px;
}
#map-container {
display: block;
}
path {
stroke: black;
stroke-width: 0.3;
}
g text {
alignment-baseline: central;
text-anchor: middle;
font-size: 10px;
}
</style>
</head>
<body>
<div id="container">
<input name="toWards"
type="button"
value="To Wards"
onclick="toWards()" />
<input name="toSquares"
type="button"
value="To Squares"
onclick="toSquares()" />
<input name="toBars"
type="button"
value="To Bars"
onclick="toBars()" />
<svg id="map-container"></svg>
</div>
<script src="script.js"></script>
</body>
</html>
// Pulled from cartograms/chi_ward_cartogram_layout.json
// Created with http://code.minnpost.com/aranger/ and Squaire WSJ library
var chi_ward_layout = [[0,0,"41"],[3,0,"50"],[4,0,"49"],[1,1,"45"],[2,1,"39"],[3,1,"40"],[4,1,"48"],[0,2,"38"],[1,2,"30"],[2,2,"35"],[3,2,"33"],[4,2,"47"],[5,2,"46"],[1,3,"29"],[2,3,"36"],[3,3,"31"],[4,3,"32"],[5,3,"44"],[2,4,"37"],[3,4,"26"],[4,4,"1"],[5,4,"2"],[6,4,"43"],[3,5,"24"],[4,5,"28"],[5,5,"27"],[6,5,"42"],[3,6,"22"],[4,6,"12"],[5,6,"25"],[6,6,"11"],[1,7,"23"],[2,7,"14"],[3,7,"16"],[4,7,"15"],[5,7,"20"],[6,7,"3"],[7,7,"4"],[2,8,"13"],[3,8,"18"],[4,8,"17"],[5,8,"21"],[6,8,"6"],[7,8,"5"],[4,9,"19"],[5,9,"34"],[6,9,"8"],[7,9,"7"],[6,10,"9"],[7,10,"10"]];
var SQ_SIZE = 50;
var ease = d3.easeQuadInOut;
var transitionTime = 500;
var transitionDelay = 15;
var projection, path, geoData, centered, maxData, svg;
var active = d3.select(null);
// Margin convention from https://bl.ocks.org/mbostock/3019563
var margin = {top: 20, right: 10, bottom: 20, left: 10};
var width = 550 - margin.left - margin.right;
var height = 650 - margin.top - margin.bottom;
var svg = d3.select("#map-container")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
function convertRectPath(x, y, w, h) {
return "M" + [[x,y], [x+w,y], [x+w, y+h], [x, y+h], [x,y]].join("L");
}
// Pulled from Mike Bostock example here: https://bl.ocks.org/mbostock/3916621
// Example without continuous update: http://bl.ocks.org/sarahob/707cb381d48f57abba57
function pathTween(d1, precision) {
return function() {
var path0 = this,
path1 = path0.cloneNode(),
n0 = path0.getTotalLength(),
n1 = (path1.setAttribute("d", d1), path1).getTotalLength();
// Uniform sampling of distance based on specified precision.
var distances = [0], i = 0, dt = precision / Math.max(n0, n1);
while ((i += dt) < 1) distances.push(i);
distances.push(1);
// Compute point-interpolators at each distance.
var points = distances.map(function(t) {
var p0 = path0.getPointAtLength(t * n0),
p1 = path1.getPointAtLength(t * n1);
return d3.interpolate([p0.x, p0.y], [p1.x, p1.y]);
});
return function(t) {
return t < 1 ? "M" + points.map(function(p) { return p(t); }).join("L") : d1;
};
};
}
// Zoom to ward on click, pulled from https://bl.ocks.org/mbostock/4699541
function reset() {
active.classed("active", false);
active = d3.select(null);
svg.transition()
.duration(transitionTime)
.style("stroke-width", "1.5px")
.attr("transform", "");
}
function clicked(d) {
if (active.node() === this) return reset();
active.classed("active", false);
active = d3.select(this).classed("active", true);
var bounds = path.bounds(d),
dx = bounds[1][0] - bounds[0][0],
dy = bounds[1][1] - bounds[0][1],
x = (bounds[0][0] + bounds[1][0]) / 2,
y = (bounds[0][1] + bounds[1][1]) / 2,
scale = .9 / Math.max(dx / width, dy / height),
translate = [width / 2 - scale * x, height / 2 - scale * y];
svg.transition()
.duration(transitionTime)
.style("stroke-width", 1.5 / scale + "px")
.attr("transform", "translate(" + translate + ")scale(" + scale + ")");
}
function transitionShapes(el, idx, tween){
d3.select(el)
.transition()
.delay(idx*transitionDelay)
.duration(transitionTime)
.ease(ease)
.attrTween('d', pathTween(tween, 5));
}
function drawCartogram(el, data, w, h){
var color = d3.scaleQuantize().domain([0,maxData]).range(colorbrewer['OrRd'][5]);
var g = el.append("g");
g.selectAll("path")
.data(data)
.enter().append("path")
.attr("d", function(d){return convertRectPath(d.x*w, d.y*h, w, h);})
.attr("fill", function(d){return color(d.val);});
var textG = el.append("g");
textG.selectAll("text")
.data(data)
.enter().append("text")
.attr("x", function(d) { return (d.x*w)+(w/2); })
.attr("y", function(d) { return (d.y*h)+(h/2); })
.text(function(d){ return d.properties.ward; });
};
function toWards() {
if (centered) {
clicked();
}
svg.selectAll("g path")
.style("opacity", "1")
.each(function(d, i) { transitionShapes(this, i, path(d)); })
.on("click", clicked);
svg.selectAll("g text")
.transition()
.delay(function(d, i) { return i*transitionDelay; })
.duration(transitionTime)
.ease(ease)
.attr("x", function(d) { return path.centroid(d)[0]; })
.attr("y", function(d) { return path.centroid(d)[1]; });
}
function toSquares() {
if (centered) {
clicked();
}
svg.selectAll("g path")
.each(function(d, i) { transitionShapes(this, i, convertRectPath(d.x*SQ_SIZE, d.y*SQ_SIZE, SQ_SIZE, SQ_SIZE)); })
.on("click", null);
svg.selectAll("g text")
.transition()
.delay(function(d, i) { return i*transitionDelay; })
.duration(transitionTime)
.ease(ease)
.attr("x", function(d) { return (d.x*SQ_SIZE)+(SQ_SIZE/2); })
.attr("y", function(d) { return (d.y*SQ_SIZE)+(SQ_SIZE/2); });
}
function toBars() {
if (centered) {
clicked();
}
var y = d3.scaleLinear().range([width-50, 0]);
var x = d3.scaleBand().rangeRound([0, height], .1);
y.domain([0, maxData]);
x.domain(geoData.map(function(d) { return d.properties.ward; }));
svg.selectAll("g path")
.each(function(d, i) {
transitionShapes(this, i, convertRectPath(25, x(d.properties.ward), width-y(d.val), x.bandwidth()));
})
.on("click", null);
svg.selectAll("g text")
.transition()
.delay(function(d, i) { return i*transitionDelay; })
.duration(transitionTime)
.ease(ease)
.attr("x", 10)
.attr("y", function(d) { return x(d.properties.ward)+(x.bandwidth()/2); });
}
(function() {
projection = d3.geoMercator().scale(1).translate([0,0]);
path = d3.geoPath().projection(projection);
d3.queue()
.defer(d3.json, "chi_wards_calls.geojson")
.await(function(error, json) {
var bounds = path.bounds(json);
var s = 0.95 / Math.max((bounds[1][0] - bounds[0][0]) / width, (bounds[1][1] - bounds[0][1]) / height);
var t = [(width - s * (bounds[1][0] + bounds[0][0])) / 2, (height - s * (bounds[1][1] + bounds[0][1])) / 2];
projection.scale(s).translate(t);
maxData = d3.max(json.features, function(d) { return d.properties.wib_calls; });
geoData = json.features.map(function(d) {
var wardRow = chi_ward_layout.filter(function(w) { return w[2] === d.properties.ward; });
if (wardRow.length) {
d.x = wardRow[0][0];
d.y = wardRow[0][1];
d.val = d.properties.wib_calls;
}
return d;
});
// Sort on ward strings
geoData = geoData.sort(function(a, b) {
a = parseInt(a.properties.ward);
b = parseInt(b.properties.ward);
if (a < b) {
return -1;
}
else if (a > b) {
return 1;
}
return 0;
});
drawCartogram(svg, geoData, SQ_SIZE, SQ_SIZE);
});
})()
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