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February 2, 2019 08:46
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Victoria (Australia) localities
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
/* CSS goes here. */ | |
.background { | |
fill: none; | |
pointer-events: all; | |
} | |
path { | |
fill: #ddd; | |
stroke: #fff; | |
stroke-width: .1px; | |
} | |
/* CSS way for hover over color */ | |
/* path:hover { | |
fill: red; | |
} */ | |
.suburbs :hover { | |
fill: red; | |
} | |
.feature { | |
fill: #ccc; | |
cursor: pointer; | |
} | |
.feature.active { | |
fill: orange; | |
} | |
.mesh { | |
fill: none; | |
stroke: #fff; | |
stroke-linecap: round; | |
stroke-linejoin: round; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v4.min.js" charset="utf-8"></script> | |
<script src="//unpkg.com/topojson@3"></script> | |
<script> | |
var width = 960, | |
height = 500 | |
active = d3.select(null); | |
var projection = d3.geoMercator() | |
.scale(1) | |
.translate([0, 0]); | |
var path = d3.geoPath() | |
.projection(projection) | |
var zoom = d3.zoom() | |
.scaleExtent([1, 8]) | |
.on('zoom', zoomed); | |
var svg = d3.select('body') | |
.append('svg') | |
.attr('width', width) | |
.attr('height', height) | |
.on('click', stopped, true); | |
svg.append('rect') | |
.attr('class', 'background') | |
.attr('width', width) | |
.attr('height', height) | |
.on('click', reset); | |
var g = svg.append('g'); | |
svg.call(zoom); // enables fee zooming | |
// Load data | |
d3.json("vic_3f_q5k_S70_topo.json", function (err, tjson) { | |
if (err) throw err; | |
var geojson = topojson.feature(tjson, tjson.objects.vic_3fields); | |
var b = path.bounds(geojson), | |
s = 0.95 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height), | |
t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2]; | |
projection | |
.scale(s) | |
.translate(t) | |
g.append('g') | |
.attr('class', 'suburbs') | |
.selectAll("path") | |
.data(geojson.features) | |
.enter().append("path") | |
.attr("d", path) | |
.attr('class', 'feature') | |
.on('click', clicked); | |
g.append('path') | |
.datum(topojson.mesh(tjson, tjson.objects.vic_3fields, function (a, b) { return a !== b; })) | |
.attr('class', 'mesh') | |
.attr('d', path); | |
}); | |
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, | |
s = Math.max(1, Math.min(8, 0.9 / Math.max(dx / width, dy / height))), | |
t = [width / 2 - s * x, height / 2 - s * y]; | |
svg.transition() | |
.duration(750) | |
.call(zoom.transform, d3.zoomIdentity.translate(t[0], t[1]).scale(s)); | |
} | |
function reset() { | |
active.classed("active", false); | |
active = d3.select(null); | |
g.transition() | |
.duration(750) | |
.call(zoom.transform, d3.zoomIdentity); | |
} | |
function zoomed() { | |
// var transform = d3.event.transform; | |
// projection.scale(transform.k).translate([transform.x, transform.y]); | |
g.style("stroke-width", 1.5 / d3.event.transform.k + "px"); | |
g.attr('transform', d3.event.transform); | |
// This line was slowing the whole sh** down | |
// g.selectAll('path').attr('d', path); | |
} | |
function stopped() { | |
if (d3.event.defaultPrevented) { | |
d3.event.stopPropagation(); | |
} | |
} | |
</script> |
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