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Last active February 9, 2016 02:01
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Ring Extraction
license: gpl-3.0
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.mesh {
fill: none;
stroke: #333;
stroke-width: .5px;
stroke-linejoin: round;
}
.play circle {
fill: white;
stroke: black;
stroke-width: 3px;
}
.play:hover path {
fill: red;
}
.play.mousedown circle {
fill: red;
}
.play.mousedown path {
fill: white;
}
.play rect {
fill: none;
pointer-events: all;
cursor: pointer;
}
.ring {
fill: none;
stroke: red;
stroke-width: 3px;
stroke-linejoin: round;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var width = 960,
height = 500;
var path = d3.geo.path()
.projection(null);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("us.json", function(error, us) {
if (error) throw error;
svg.append("path")
.datum(topojson.mesh(us))
.attr("class", "mesh")
.attr("d", path);
var play = svg.append("g")
.attr("class", "play");
play.append("circle")
.attr("r", 45)
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
play.append("path")
.attr("d", "M-22,-30l60,30l-60,30z")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")scale(.7)");
play.append("rect")
.attr("width", width)
.attr("height", height)
.on("mousedown", function() {
play.classed("mousedown", true);
d3.select(window).on("mouseup", function() { play.classed("mousedown", false); });
})
.on("click", function() {
resetAll();
animation();
});
function resetAll() {
play.style("display", null);
}
function animation() {
play.style("display", "none");
var rings = d3.merge(topojson.feature(us, us.objects.states).features.map(function(d) {
return d.geometry.type === "Polygon"
? d.geometry.coordinates
: d3.merge(d.geometry.coordinates);
}));
var interval = setInterval(function() {
var ring = rings.pop();
if (!ring) return clearInterval(interval), void setTimeout(resetAll, 750);
svg.append("path")
.datum({type: "Polygon", coordinates: [ring]})
.attr("class", "ring")
.attr("d", path)
.transition()
.duration(500)
.style("stroke-opacity", 0)
.remove();
}, 100);
}
});
</script>
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