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index.html
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<html>
<head>
<meta name="viewport" content="width=device-width">
<meta charset="utf-8">
<link rel="stylesheet" type="text/css" href="https://meyerweb.com/eric/tools/css/reset/reset.css">
<style>
.background {
fill: none;
pointer-events: all;
}
.feature {
fill: #ccc;
cursor: pointer;
}
.feature.active {
fill: red;
}
.mesh {
fill: none;
stroke: #fff;
stroke-linecap: round;
stroke-linejoin: round;
}
</style>
</head>
<body>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script src="//code.jquery.com/jquery-3.2.1.min.js"></script>
<script>
var viewport_width = $(window).width(),
viewport_height = $(window).height(),
width = viewport_width,
height = viewport_height,
active = d3.select(null);
var projection = d3.geoAlbers()
.scale(5.3 * height)
.rotate([0, 0])
.center([-3.4360, 55.3781])
.translate([width / 2, height / 2]);
var zoom = d3.zoom()
.scaleExtent([1, 400])
.on("zoom", zoomed);
var initialTransform = d3.zoomIdentity
.translate(0, 0)
.scale(1);
var path = d3.geoPath()
.projection(projection);
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) // delete this line to disable free zooming
.call(zoom.transform, initialTransform);
d3.json("constituencies.quant.topo.json", function(error, us) {
if (error) throw error;
g.selectAll("path")
.data(topojson.feature(us, us.objects.constituencies).features)
.enter().append("path")
.attr("d", path)
.attr("class", "feature")
.on("click", clicked);
g.append("path")
.datum(topojson.mesh(us, us.objects.constituencies, 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,
scale = Math.max(1, Math.min(50, 0.9 / Math.max(dx / width, dy / height))),
translate = [width / 2 - scale * x, height / 2 - scale * y];
var transform = d3.zoomIdentity
.translate(translate[0], translate[1])
.scale(scale);
svg.transition()
.duration(750)
.call(zoom.transform, transform);
}
function reset() {
active.classed("active", false);
active = d3.select(null);
svg.transition()
.duration(750)
.call(zoom.transform, initialTransform);
}
function zoomed() {
var transform = d3.event.transform;
g.style("stroke-width", 1 / transform.k + "px");
g.attr("transform", transform);
}
// If the drag behavior prevents the default click,
// also stop propagation so we don’t click-to-zoom.
function stopped() {
if (d3.event.defaultPrevented) d3.event.stopPropagation();
}
</script>
</body>
</html>