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Flu Illness Cartogram
Raw
.aaa.md

CDC ILI map

Raw
.block
license: mit
Raw
README.md
Raw
index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="//cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.18.1/babel.min.js"></script>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/3.0.0/topojson.min.js"></script>
<style>
#cartogram {
max-width: 600px;
margin: auto;
}
.week-label {
font-family: Helvetica;
font-size: 1em;
color: #fff;
}
body {
background-color:#000; margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
</style>
</head>
<body>
<div id="cartogram"></div>
<script type="text/babel" src="index.js"></script>
</body>
Raw
index.js
const statesJson = {"AL":{"name":"Alabama","pop_2014":4849377,"W1":10,"W2":10,"W3":10,"W4":10,"W5":10,"W6":10,"W40":2,"W41":2,"W42":2,"W43":3,"W44":4,"W45":4,"W46":5,"W47":5,"W48":5,"W49":7,"W50":10,"W51":10,"W52":10},"AK":{"name":"Alaska","pop_2014":736732,"W1":6,"W2":6,"W3":6,"W4":8,"W5":10,"W6":10,"W40":1,"W41":2,"W42":4,"W43":3,"W44":2,"W45":2,"W46":4,"W47":4,"W48":5,"W49":6,"W50":5,"W51":6,"W52":7},"AZ":{"name":"Arizona","pop_2014":6731484,"W1":10,"W2":10,"W3":10,"W4":10,"W5":10,"W6":10,"W40":2,"W41":2,"W42":1,"W43":2,"W44":3,"W45":3,"W46":3,"W47":3,"W48":3,"W49":6,"W50":10,"W51":10,"W52":10},"AR":{"name":"Arkansas","pop_2014":2966369,"W1":10,"W2":10,"W3":10,"W4":10,"W5":10,"W6":10,"W40":1,"W41":1,"W42":1,"W43":1,"W44":1,"W45":1,"W46":3,"W47":1,"W48":4,"W49":8,"W50":10,"W51":10,"W52":10},"CA":{"name":"California","pop_2014":38802500,"W1":10,"W2":10,"W3":8,"W4":8,"W5":9,"W6":8,"W40":2,"W41":1,"W42":1,"W43":1,"W44":2,"W45":2,"W46":2,"W47":3,"W48":2,"W49":4,"W50":7,"W51":10,"W52":10},"CO":{"name":"Colorado","pop_2014":5355866,"W1":8,"W2":7,"W3":7,"W4":8,"W5":10,"W6":9,"W40":1,"W41":1,"W42":1,"W43":1,"W44":2,"W45":2,"W46":2,"W47":3,"W48":3,"W49":4,"W50":5,"W51":6,"W52":7},"CT":{"name":"Connecticut","pop_2014":3596677,"W1":4,"W2":5,"W3":9,"W4":10,"W5":10,"W6":10,"W40":1,"W41":1,"W42":1,"W43":1,"W44":1,"W45":1,"W46":1,"W47":1,"W48":2,"W49":2,"W50":3,"W51":2,"W52":3},"DC":{"name":"District 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const width = 600
const height = 400
const scale = 0.64
const colorScale = d3.scaleLinear().domain([0, 10]).range(['#feebe2', '#c51b8a'])
function interpolateEachNode (node) {
const circle = pseudocircle(node)
const closestPoints = node.rings.slice(1).map(function (ring) {
const i = d3.scan(circle.map(point => distance(point, ring.centroid)))
return ring.map(() => circle[i])
})
const interpolator = d3.interpolateArray(node.rings, [circle, ...closestPoints])
node.interpolator = function (t) {
const str = pathString(interpolator(t))
// Prevent some fill-rule flickering for MultiPolygons
if (t > 0.99) {
return str.split('Z')[0] + 'Z'
}
return str
}
}
function displayTextNodes (g, show) {
return () => {
const display = show ? 'block' : 'none'
g.selectAll('text').style('display', display)
}
}
function pseudocircle (node) {
return node.rings[0].map(point => {
var angle = node.startingAngle - 2 * Math.PI * (point.along / node.perimeter)
return [
Math.cos(angle) * node.r + node.x,
Math.sin(angle) * node.r + node.y
]
})
}
function cleanUpGeometry (node) {
node.rings = (node.geometry.type === 'Polygon' ? [node.geometry.coordinates] : node.geometry.coordinates)
node.rings = node.rings.map(polygon => {
polygon[0].area = d3.polygonArea(polygon[0])
polygon[0].centroid = d3.polygonCentroid(polygon[0])
return polygon[0]
})
node.rings.sort((a, b) => b.area - a.area)
node.perimeter = d3.polygonLength(node.rings[0])
// Optional step, but makes for more circular circles
bisect(node.rings[0], node.perimeter / 72)
node.rings[0].reduce(function (prev, point) {
point.along = prev ? prev.along + distance(point, prev) : 0
node.perimeter = point.along
return point
}, null)
node.startingAngle = Math.atan2(node.rings[0][0][1] - node.y0, node.rings[0][0][0] - node.x0)
}
function bisect (ring, maxSegmentLength) {
for (var i = 0; i < ring.length; i++) {
const a = ring[i]
let b = i === ring.length - 1 ? ring[0] : ring[i + 1]
while (distance(a, b) > maxSegmentLength) {
b = midpoint(a, b)
ring.splice(i + 1, 0, b)
}
}
}
function distance (a, b) {
return Math.sqrt((a[0] - b[0]) * (a[0] - b[0]) + (a[1] - b[1]) * (a[1] - b[1]))
}
function midpoint (a, b) {
return [a[0] + (b[0] - a[0]) * 0.5, a[1] + (b[1] - a[1]) * 0.5]
}
function pathString (d) {
return (d.rings || d).map(ring => 'M' + ring.join('L') + 'Z').join(' ')
}
function applyLabelToNodes (g, nodes) {
// apply state labels
g.selectAll('g')
.data(nodes)
.enter()
.append('text')
.text(d => {
if (d.r > 14) {
return d.id
}
})
.attr('text-anchor', 'middle')
.attr('y', d => d.y + 5)
.attr('x', d => d.x)
.attr('class', 'state-label')
.style('display', 'none')
}
function updateNodesForWeek (val) {
return (d, i) => {
const state = statesJson[d.id]
const colorNum = state[`W${val}`]
return colorScale(colorNum)
}
}
function createSimulation (nodes, links, width, height) {
return d3.forceSimulation(nodes)
.force('cx', d3.forceX().x(d => width / 2).strength(0.02))
.force('cy', d3.forceY().y(d => height / 2).strength(0.02))
.force('link', d3.forceLink(links).distance(d => d.distance))
.force('x', d3.forceX().x(d => d.x).strength(0.1))
.force('y', d3.forceY().y(d => d.y).strength(0.1))
.force('collide', d3.forceCollide().strength(0.8).radius(d => d.r + 1))
.stop()
}
function setupNodeData (node, i) {
const centroid = d3.geoPath().centroid(node)
const radius = d3.scaleSqrt().range([0, 75]).clamp(true)
node.x0 = centroid[0]
node.y0 = centroid[1]
const state = statesJson[node.id] || {}
node.stateName = state.name
node.r = radius(state.pop_2014 / 35000000)
cleanUpGeometry(node)
}
function updateWeekLabel (text) {
return () => {
d3.select('.week-label').text(text)
}
}
function initMap(selector = '#cartogram') {
d3.select(selector)
.append('p')
.attr('class', 'week-label')
const svg = d3.select(selector).append('svg')
.attr('width', width)
.attr('height', height)
.attr('id', 'map-svg')
.attr('viewBox', `0 0 ${width} ${height}`)
d3.json('us-topo.json', (err, us) => {
if (err) { throw Error(err) }
const neighbors = topojson.neighbors(us.objects.states.geometries)
const nodes = topojson.feature(us, us.objects.states).features
nodes.forEach(setupNodeData)
const g = svg.append('g')
.attr('transform', `scale(${scale}) translate(0, 0)`)
.attr('id', 'states')
const states = g.selectAll('g')
.data(nodes)
.enter()
.append('path')
.attr('d', pathString)
.attr('fill', '#eee')
d3.select(selector)
.append('p')
.text('Source: CDC')
.attr('class', 'credit')
simulate()
function simulate () {
nodes.forEach(node => {
node.x = node.x0
node.y = node.y0
})
const links = d3.merge(neighbors.map(function (neighborSet, i) {
return neighborSet.filter(j => nodes[j]).map(function (j) {
return {source: i, target: j, distance: nodes[i].r + nodes[j].r + 3}
})
}))
const simulation = createSimulation(nodes, links, width, height)
while (simulation.alpha() > 0.1) {
simulation.tick()
}
nodes.forEach(interpolateEachNode)
applyLabelToNodes(g, nodes)
const transDelay = 600
const transDuration = 900
states.sort((a, b) => b.r - a.r)
.transition().on('start', updateWeekLabel('Oct 7th, 2017'))
.attr('fill', '#eee')
.delay(transDelay).duration(transDuration) // change to circles
.attrTween('d', node => node.interpolator)
.on('end', displayTextNodes(g, true))
.transition()
.delay(transDelay)
.duration(transDuration)
.attr('fill', updateNodesForWeek(40))
.transition().on('start', updateWeekLabel('Nov 4th, 2017'))
.delay(transDelay)
.duration(transDuration)
.attr('fill', updateNodesForWeek(44))
.transition().on('start', updateWeekLabel('Dec 2nd, 2017'))
.delay(transDelay)
.duration(transDuration)
.attr('fill', updateNodesForWeek(48))
.transition().on('start', updateWeekLabel('Dec 30th 2017'))
.delay(transDelay)
.duration(transDuration)
.attr('fill', updateNodesForWeek(52))
.transition().on('start', updateWeekLabel('Jan 13, 2018'))
.delay(transDelay)
.duration(transDuration)
.attr('fill', updateNodesForWeek(2))
.transition().on('start', updateWeekLabel('Feb 10, 2018'))
.delay(transDelay)
.duration(transDuration)
.attr('fill', updateNodesForWeek(6))
.transition()
.on('start', displayTextNodes(g, false))
.delay(transDelay) // back to states
.attrTween('d', node => t => node.interpolator(1 - t))
.on('end', (d, i) => i || simulate())
}
})
}
initMap()
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us-topo.json
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