Original work by Philippe Rivière for d3-voronoi.
Last active
September 5, 2016 21:21
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Urquhart graph
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.graph { | |
stroke: #f40024; | |
stroke-opacity: 1; | |
stroke-width: 2; | |
} | |
.polygons { | |
fill: none; | |
stroke: #dbdbdb; | |
stroke-width: 1; | |
} | |
.polygons.found { | |
fill: #f00; | |
} | |
.sites { | |
fill: #000; | |
stroke: #fff; | |
} | |
</style> | |
<svg width="960" height="500"></svg> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script> | |
var svg = d3.select("svg"), | |
width = +svg.attr("width"), | |
height = +svg.attr("height"); | |
var sites = d3.range(2000) | |
.map(function(d) { return [Math.random() * width, Math.random() * height]; }) | |
.map(function(d,i) { d.index = i; return d; }); | |
var voronoi = d3.voronoi(); | |
var polygon = svg.append("g") | |
.attr("class", "polygons") | |
.selectAll("path") | |
.data(voronoi.polygons(sites)) | |
.enter().append("path") | |
.call(redrawPolygon); | |
var graph = svg.append('g') | |
.attr('class', 'graph'); | |
var site = svg.append('g') | |
.attr('class', 'site') | |
.selectAll('circle') | |
.data(sites) | |
.enter() | |
.append('circle') | |
.attr('r',2) | |
.attr('fill','white') | |
.attr('stroke','black') | |
.call(redrawSite) | |
; | |
var diagram = voronoi(sites); | |
diagram.urquhart = function(){ | |
var urquhart = d3.map(); | |
diagram.links() | |
.forEach(function(link) { | |
var v = d3.extent([link.source.index, link.target.index]); | |
urquhart.set(v, link); | |
}); | |
urquhart._remove = []; | |
diagram.triangles() | |
.forEach(function(t) { | |
var l = 0, length = 0, i, v; | |
for (var j=0; j<3; j++) { | |
var a = t[j], b = t[(j+1)%3]; | |
v = d3.extent([a.index, b.index]); | |
length = (a[0]-b[0]) * (a[0]-b[0]) + (a[1]-b[1]) * (a[1]-b[1]); | |
if (length > l) { | |
l = length; | |
i = v; | |
} | |
} | |
urquhart._remove.push(i); | |
}); | |
urquhart._remove.forEach(function(i) { | |
if (urquhart.has(i)) urquhart.remove(i); | |
}); | |
return urquhart.values(); | |
} | |
drawgraph(); | |
function drawgraph(){ | |
var links = diagram.urquhart(); | |
graph | |
.selectAll('line') | |
.data(links) | |
.enter().append('line') | |
.attr('x1', function(l){ return l.source[0];}) | |
.attr('y1', function(l){ return l.source[1];}) | |
.attr('x2', function(l){ return l.target[0];}) | |
.attr('y2', function(l){ return l.target[1];}) | |
} | |
function redraw() { | |
polygon = polygon.data(diagram.polygons()).call(redrawPolygon); | |
site = polygon.data(sites).call(redrawSite); | |
drawgraph(); | |
} | |
function redrawPolygon(polygon) { | |
polygon.attr("d", function(d) { | |
if (d && !d.filter(function(n){ return !n}).length) { | |
return "M" + d.join("L") + "Z"; | |
} | |
}); | |
} | |
function redrawSite(site) { | |
site | |
.attr("transform", function(d) { return 'translate(' + d + ')'; }); | |
} | |
</script> |
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�PNG | |