A simple heatmap of node positions over the course of a force-directed layout algorithm. Click and drag nodes to see the heatmap update.
Forked from Mike Bostock's force-directed layout example.
A simple heatmap of node positions over the course of a force-directed layout algorithm. Click and drag nodes to see the heatmap update.
Forked from Mike Bostock's force-directed layout example.
<!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> |
{ | |
"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}, | |
{"source":2,"target":0,"value":8}, | |
{"source":3,"target":0,"value":10}, | |
{"source":3,"target":2,"value":6}, | |
{"source":4,"target":0,"value":1}, | |
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] | |
} |