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piwodlaiwo/.block

Last active June 7, 2018 14:31
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Zoom to Country in D3v4
Raw
.block
license: mit
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.background {
fill: none;
pointer-events: all;
}
.feature {
fill: #ccc;
cursor: pointer;
}
.feature.active {
fill: orange;
}
.mesh {
fill: none;
stroke: #fff;
stroke-linecap: round;
stroke-linejoin: round;
}
</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
<script>
var width = 960,
height = 500,
active = d3.select(null);
var projection = d3.geoMercator()
.scale(150)
.translate([width / 2, height / 2]);
var zoom = d3.zoom().on("zoom", zoomed);
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.event); // not in d3 v4
d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/world-50m.json", function(error, world) {
if (error) throw error;
g.selectAll("path")
.data(topojson.feature(world, world.objects.countries).features)
.enter().append("path")
.attr("d", path)
.attr("class", "feature")
.on("click", clicked);
g.append("path")
.datum(topojson.mesh(world, world.objects.countries, 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(8, 0.9 / Math.max(dx / width, dy / height))),
translate = [width / 2 - scale * x, height / 2 - scale * y];
svg.transition()
.duration(750)
// .call(zoom.translate(translate).scale(scale).event); // not in d3 v4
.call( zoom.transform, d3.zoomIdentity.translate(translate[0],translate[1]).scale(scale) ); // updated for d3 v4
}
function reset() {
active.classed("active", false);
active = d3.select(null);
svg.transition()
.duration(750)
// .call( zoom.transform, d3.zoomIdentity.translate(0, 0).scale(1) ); // not in d3 v4
.call( zoom.transform, d3.zoomIdentity ); // updated for d3 v4
}
function zoomed() {
g.style("stroke-width", 1.5 / d3.event.transform.k + "px");
// g.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")"); // not in d3 v4
g.attr("transform", d3.event.transform); // updated for d3 v4
}
// 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>
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