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lorenzopub/.block

Created June 19, 2017 11:47
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d3js v4 map + zoom + mark city + drag
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.block
license: mit
Raw
index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
</style>
</head>
<body>
<script>
const width = 960,
height = 500,
projection = d3.geoMercator()
.center([0, 5])
.scale(200)
.rotate([-180, 0]),
svg = d3.select('body').append('svg')
.attr('width', width)
.attr('height', height),
path = d3.geoPath()
.projection(projection),
g = svg.append('g'),
cities = [{ 'code': 'ZNZ', 'city': 'ZANZIBAR', 'country': 'TANZANIA', 'lat': '-6.13', 'lon': '39.31' }, { 'code': 'OTT', 'city': 'OTTAWA', 'country': 'CANADA', 'lat': '23.10', 'lon': '120.34' }, { 'code': 'BSB', 'city': 'BRASILIA', 'country': 'BRAZIL', 'lat': '-32.85', 'lon': '133.30' }, { 'code': 'DEL', 'city': 'DELHI', 'country': 'INDIA', 'lat': '4.71', 'lon': '-127.57' }, { 'code': 'CMX', 'city': 'CIDADE DO MÉXICO', 'country': 'MÉXICO', 'lat': '0.42', 'lon': '93.19' }, { 'code': 'SID', 'city': 'SIDNEY', 'country': 'AUSTRALIA', 'lat': '-48.38', 'lon': '-71.71' }, { 'code': 'TOK', 'city': 'TOQUIO', 'country': 'JAPÃO', 'lat': '17.34', 'lon': '-81.73' }, { 'code': 'CCA', 'city': 'CIDADE DO CABO', 'country': 'AFRICA DO SUL', 'lat': '-43.20', 'lon': '-171.97' }, { 'code': 'CMP', 'city': 'CAMPO GRANDE', 'country': 'BRASIL', 'lat': '-36.15', 'lon': '130.72' }, { 'code': 'PAR', 'city': 'PARIS', 'country': 'FRANÇA', 'lat': '22.19', 'lon': '174.27' }, { 'code': 'NOY', 'city': 'NOVA YORK', 'country': 'USA', 'lat': '11.23', 'lon': '112.96' }]
g.append('image')
.attr('xlink:href', 'https://upload.wikimedia.org/wikipedia/commons/8/80/World_map_-_low_resolution.svg')
.append('path')
.attr('d', path)
// Carregar cidades | load city
//d3.json('cities.json', (error, data) => {
const circles = g.selectAll('circle')
.data(cities)
.enter()
.append('a')
.attr('xlink:href', d => `https://www.google.com/search?q=${d.city}`
)
.append('circle')
.attr('cx', d => projection([d.lon, d.lat])[0])
.attr('cy', d => projection([d.lon, d.lat])[1])
.attr('r', 5)
.style('fill', 'red'),
drag_handler = d3.drag()
.on('start', drag_start)
.on('drag', drag_drag)
function drag_start() {
start_x = +d3.event.x
start_y = +d3.event.y
}
function drag_drag(d) {
//Get the current scale of the circle
//case where we haven't scaled the circle yet
// get lon x lat
console.log('lon x lat', projection.invert([d3.event.x, d3.event.y]))
if (!this.getAttribute('transform'))
current_scale = 1
else {
current_scale_string = this.getAttribute('transform').split(' ')[1]
current_scale = +current_scale_string.substring(6, current_scale_string.length - 1)
}
d3.select(this)
.attr('cx', d.x = start_x + ((d3.event.x - start_x) / current_scale))
.attr('cy', d.y = start_y + ((d3.event.y - start_y) / current_scale))
}
drag_handler(circles)
// zoom and pan
const zoom = d3.zoom()
.on('zoom', () => {
g.style('stroke-width', `${1.5 / d3.event.transform.k}px`)
g.attr('transform', d3.event.transform) // updated for d3 v4
})
svg.call(zoom)
</script>
</body>
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