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Swoopy US tour
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8" /> | |
<style> | |
body { | |
background-color: #e9ddcd; | |
} | |
path { | |
fill: none; | |
stroke-linejoin: round; | |
stroke-linecap: round; | |
} | |
g path { | |
stroke: #444; | |
stroke-width: 2px; | |
} | |
g path:last-of-type { | |
stroke-dasharray: 12,5,1,5; | |
} | |
#swoop { | |
stroke: #d52621; | |
stroke-width: 5px; | |
} | |
#arrowhead { | |
fill: #d52621; | |
stroke: none; | |
} | |
</style> | |
</head> | |
<body> | |
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" width="960" height="500"> | |
<g></g> | |
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c8.5-13.8,15.1-28.4,19.9-43.7"/> | |
<defs> | |
<path id="arrowhead" d="M10,0 L-3,-8 L-3,8 Z" /> | |
</defs> | |
</svg> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.min.js"></script> | |
<script> | |
var svg = d3.select("svg"), | |
path = document.querySelector("path"), | |
totalLength = path.getTotalLength(), | |
numArrows = 8, | |
group = totalLength / numArrows, | |
duration = 1800, | |
arrowLength = Math.round(group * 0.9), | |
start; | |
var arrowheads = svg.selectAll("use") | |
.data(d3.range(numArrows).map(function(d){ return d * group + arrowLength; })) | |
.enter() | |
.append("use") | |
.attr("xlink:href", "#arrowhead"); | |
path.style.strokeDasharray = arrowLength + "," + (group - arrowLength); | |
d3.json("/mbostock/raw/4090846/us.json", function(err, us) { | |
var filtered = { | |
type: "GeometryCollection", | |
geometries: us.objects.states.geometries.filter(function(d) { | |
return d.id !== 2 && d.id !== 15 && d.id < 60; // No AK, HI, PR | |
}) | |
}; | |
var inner = topojson.mesh(us, filtered, function(a, b){ return a !== b; }), | |
outer = topojson.mesh(us, filtered, function(a, b){ return a === b; }); | |
var geoPath = d3.geoPath() | |
.projection(d3.geoAlbersUsa().fitExtent([[10, 10],[950, 490]], outer)); | |
svg.select("g").selectAll("path") | |
.data([outer, inner]) | |
.enter() | |
.append("path") | |
.attr("d", geoPath); | |
requestAnimationFrame(update); | |
}); | |
function update(t) { | |
if (!start) { | |
start = t; | |
} | |
var offset = -group * ((t - start) % duration) / duration; | |
path.style.strokeDashoffset = offset; | |
arrowheads.attr("transform",function(d){ | |
var l = d - offset; | |
if (l < 0) { | |
l = totalLength + l; | |
} else if (l > totalLength) { | |
l -= totalLength; | |
} | |
var p = pointAtLength(l); | |
return "translate(" + p + ") rotate( " + angleAtLength(l) + ")"; | |
}); | |
requestAnimationFrame(update); | |
} | |
function pointAtLength(l) { | |
var xy = path.getPointAtLength(l); | |
return [xy.x, xy.y]; | |
} | |
// Approximate tangent | |
function angleAtLength(l) { | |
var a = pointAtLength(Math.max(l - 0.01,0)), // this could be slightly negative | |
b = pointAtLength(l + 0.01); // browsers cap at total length | |
return Math.atan2(b[1] - a[1], b[0] - a[0]) * 180 / Math.PI; | |
} | |
</script> |
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