Step 1 of 4 of topology construction. From How To Infer Topology.
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February 9, 2016 02:01
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Ring Extraction
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license: gpl-3.0 |
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<!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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