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script.js
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script.js
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var ƒ = d3.f
var width = 187
var height = width/2
var colors = ['#F44336', '#2196F3', '#4CAF50', '#9C27B0', '#ccc','#FF9800', '#795548']
function sizeCanvas(sel){
sel
.at({width: width, height: height})
.st({width: width*2 + 'px', height: height*2 + 'px'})
}
//set up html
var sel = d3.select('#map-container').html('')
sel.appendMany(['map', 'cotton-candy', 'melting'], 'canvas').at('id', ƒ())
//sliders
var controlSel = sel.append('div#controls')
var sliders = controlSel.appendMany('λφγ'.split(''), 'div')
sliders.append('span').text(ƒ())
var inputes = sliders.append('input')
.at({type: 'range', min: -3, max: 3, step: .001})
.each(function(d, i){ this.value = +!i })
//drop down
var projections = d3.keys(d3).filter(function(d){
return d.slice(0, 3) == 'geo' &&
!~d.indexOf('Raw') &&
!~d.indexOf('Modified') &&
~(''+d3[d]).indexOf('Projection')
}).sort(d3.ascendingKey(function(d){ return d.replace('geoSinusoidal', '') }))
var menu = controlSel.append('select#menu')
.on('change', function(){
projection = d3[projections[this.selectedIndex]]()
.rotate(projection.rotate())
.fitSize([width, height], land)
path.projection(projection)
})
menu.appendMany(projections, 'option')
.text(function(d){ return d.replace('geo', '') })
//set up globe
var ctx = d3.select('#map').call(sizeCanvas).node().getContext('2d')
var projection = d3.geoSinusoidal()
var path = d3.geoPath().projection(projection).context(ctx)
var land
d3.json('world-1000m.json', function(err, world){
land = topojson.feature(world, world.objects.countries)
projection.fitSize([width, height], land)
var byContinent = d3.nest()
.key(ƒ('properties', 'continent'))
.entries(world.objects.countries.geometries)
.map(function(d){ return topojson.merge(world, d.values) })
byContinent.sort(d3.descendingKey(ƒ('coordinates', 'length')))
if (window.timer) window.timer.stop()
window.timer = d3.timer(function(t){
var r = projection.rotate()
controlSel.selectAll('input').each(function(d, i){
r[i] += +this.value
})
projection.rotate(r)
ctx.clearRect(0, 0, width, height)
byContinent.forEach(function(d, i){
ctx.fillStyle = colors[i]
ctx.beginPath(), path(d), ctx.fill()
})
drawPoints(getPoints())
})
})
//convert projection to pixels
var s = 1
function getPoints(){
var img = ctx.getImageData(0, 0, width, height).data
var pts = []
for (var x = 0; x < width; x += s) {
for (var y = 0; y < height; y += s) {
var i = (x + y*width)*4
if (img[i] > 2) pts.push([x, y, img[i], img[i + 1], img[i + 2]])
}
}
return pts
}
var ctx2 = d3.select('#cotton-candy').call(sizeCanvas)
.node().getContext('2d')
var ctx3 = d3.select('#melting').call(sizeCanvas)
.node().getContext('2d')
function drawPoints(pts){
//draw top map
ctx2.clearRect(0, 0, width, height)
d3.nest()
.key(ƒ(1))
.entries(pts)
.map(ƒ('values'))
.forEach(function(d){
d.forEach(function(e, i){
e.x = i*s + Math.round(width/2 - d.length/2)
})
})
d3.nest()
.key(function(d){ return 'rgb(' + [d[2], d[3], d[4]] + ')' })
.entries(pts)
.forEach(function(d){
ctx2.fillStyle = d.key
ctx2.beginPath()
d.values.forEach(function(d){ ctx2.rect(d.x, d[1], s, s) })
ctx2.fill()
})
//draw bot map
ctx3.clearRect(0, 0, width, height)
d3.nest()
.key(ƒ(0))
.entries(pts)
.map(ƒ('values'))
.forEach(function(d){
d.forEach(function(e, i){
e.y = i*s + Math.round(height/2 - d.length/2)
})
})
d3.nest()
.key(function(d){ return 'rgb(' + [d[2], d[3], d[4]] + ')' })
.entries(pts)
.forEach(function(d){
ctx3.fillStyle = d.key
ctx3.beginPath()
d.values.forEach(function(d){ ctx3.rect(d[0], d.y, s, s) })
ctx3.fill()
})
}
//topojson -p -q 1e3 -s .0005 world-110m.json > world-1000m.json && ll