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Heatmap of Force-Directed Graph Node Positions
Raw
README.md
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
svg, canvas {
position: absolute;
left: 0;
top: 0;
}
svg {
background: #fff;
border: 1px solid #ddd;
}
.node {
stroke: #fff;
stroke-width: 1.5px;
}
.link {
stroke: #999;
stroke-opacity: .6;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
height = 500,
scale = 0.3;
var gridSize = 10;
// Keeps a count of how many nodes have been in each cell during a "tick"
var grid = d3.range(0, height/gridSize).map(function() {
return d3.range(0, width/gridSize).map(function() { return 0 });
});
var color = d3.scale.category20();
var outterScale = d3.scale.pow()
.exponent(0.4)
.domain([0,1])
.range([0,1]);
var heatmapColor = d3.scale.linear()
.clamp(true)
.domain([0, 0.1111111111111111, 0.2222222222222222, 0.3333333333333333, 0.4444444444444444, 0.5555555555555555, 0.6666666666666666, 0.7777777777777777, 0.8888888888888888, 1])
.range(['#ffffff','#fff7f3','#fde0dd','#fcc5c0','#fa9fb5',
'#f768a1','#dd3497','#ae017e','#7a0177','#49006a']);
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
var canvas = d3.select("body").append("canvas")
.attr("width", width)
.attr("height", height);
var svg = d3.select("body").append("svg")
.attr("width", scale * width)
.attr("height", scale * height)
.append("g")
.attr("transform", "scale(" + scale + ", " + scale + ")");
var context = canvas.node().getContext("2d");
d3.json("miserables.json", function(error, graph) {
if (error) throw error;
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 8)
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
node.append("title")
.text(function(d) { return d.name; });
force.on("tick", function() {
link.attr("x1", function(d) { d.source.x = boundedCoords(d.source.x, width); return d.source.x; })
.attr("y1", function(d) { d.source.y = boundedCoords(d.source.y, height); return d.source.y; })
.attr("x2", function(d) { d.target.x = boundedCoords(d.target.x, width); return d.target.x; })
.attr("y2", function(d) { d.target.y = boundedCoords(d.target.y, height); return d.target.y; });
node.attr("cx", function(d) { d.x = boundedCoords(d.x, width); return d.x; })
.attr("cy", function(d) { d.y = boundedCoords(d.y, height); return d.y; });
// Increment the counts
node.each(function(d) {
var row = Math.min(Math.floor(d.y/gridSize), grid.length - 1);
var col = Math.min(Math.floor(d.x/gridSize), grid[0].length - 1);
grid[row][col] += 1;
});
// Max cell value, for normalizing
var gridMax = d3.max(grid, function(row) {
return d3.max(row);
});
// Draw the grid
context.clearRect(0, 0, width, height);
grid.forEach(function(row, i) {
row.forEach(function(cell, j) {
context.beginPath();
context.fillStyle = heatmapColor(outterScale(cell/gridMax));
context.rect(j*gridSize, i*gridSize, gridSize, gridSize);
context.fill();
context.closePath();
});
});
});
});
function boundedCoords(pos, maxPos) {
return Math.min(maxPos, Math.max(0, pos));
}
</script>
Raw
miserables.json
{
"nodes":[
{"name":"Myriel","group":1},
{"name":"Napoleon","group":1},
{"name":"Mlle.Baptistine","group":1},
{"name":"Mme.Magloire","group":1},
{"name":"CountessdeLo","group":1},
{"name":"Geborand","group":1},
{"name":"Champtercier","group":1},
{"name":"Cravatte","group":1},
{"name":"Count","group":1},
{"name":"OldMan","group":1},
{"name":"Labarre","group":2},
{"name":"Valjean","group":2},
{"name":"Marguerite","group":3},
{"name":"Mme.deR","group":2},
{"name":"Isabeau","group":2},
{"name":"Gervais","group":2},
{"name":"Tholomyes","group":3},
{"name":"Listolier","group":3},
{"name":"Fameuil","group":3},
{"name":"Blacheville","group":3},
{"name":"Favourite","group":3},
{"name":"Dahlia","group":3},
{"name":"Zephine","group":3},
{"name":"Fantine","group":3},
{"name":"Mme.Thenardier","group":4},
{"name":"Thenardier","group":4},
{"name":"Cosette","group":5},
{"name":"Javert","group":4},
{"name":"Fauchelevent","group":0},
{"name":"Bamatabois","group":2},
{"name":"Perpetue","group":3},
{"name":"Simplice","group":2},
{"name":"Scaufflaire","group":2},
{"name":"Woman1","group":2},
{"name":"Judge","group":2},
{"name":"Champmathieu","group":2},
{"name":"Brevet","group":2},
{"name":"Chenildieu","group":2},
{"name":"Cochepaille","group":2},
{"name":"Pontmercy","group":4},
{"name":"Boulatruelle","group":6},
{"name":"Eponine","group":4},
{"name":"Anzelma","group":4},
{"name":"Woman2","group":5},
{"name":"MotherInnocent","group":0},
{"name":"Gribier","group":0},
{"name":"Jondrette","group":7},
{"name":"Mme.Burgon","group":7},
{"name":"Gavroche","group":8},
{"name":"Gillenormand","group":5},
{"name":"Magnon","group":5},
{"name":"Mlle.Gillenormand","group":5},
{"name":"Mme.Pontmercy","group":5},
{"name":"Mlle.Vaubois","group":5},
{"name":"Lt.Gillenormand","group":5},
{"name":"Marius","group":8},
{"name":"BaronessT","group":5},
{"name":"Mabeuf","group":8},
{"name":"Enjolras","group":8},
{"name":"Combeferre","group":8},
{"name":"Prouvaire","group":8},
{"name":"Feuilly","group":8},
{"name":"Courfeyrac","group":8},
{"name":"Bahorel","group":8},
{"name":"Bossuet","group":8},
{"name":"Joly","group":8},
{"name":"Grantaire","group":8},
{"name":"MotherPlutarch","group":9},
{"name":"Gueulemer","group":4},
{"name":"Babet","group":4},
{"name":"Claquesous","group":4},
{"name":"Montparnasse","group":4},
{"name":"Toussaint","group":5},
{"name":"Child1","group":10},
{"name":"Child2","group":10},
{"name":"Brujon","group":4},
{"name":"Mme.Hucheloup","group":8}
],
"links":[
{"source":1,"target":0,"value":1},
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]
}
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