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Draggable Canvas Force Graph
Raw
README.md

Based on Force-Directed Graph. Not quite working completely (nodes don't stick to cursor while dragging). Updating the quadtree every tick also causes problems for large graphs.

Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
height = 500;
var color = d3.scale.category20();
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
var points = [];
var quadtree = d3.geom.quadtree()
.extent([[0, 0], [width, height]]);
var quad;
var selectedNode;
var drag = d3.behavior.drag();
var canvas = d3.select("body").append("canvas")
.attr("width", width)
.attr("height", height)
.node();
var ctx = canvas.getContext("2d");
d3.json("miserables.json", function(error, graph) {
force
.nodes(graph.nodes)
.links(graph.links)
.start();
points = graph.nodes.map(function(d) { return [d.x, d.y]; });
quad = quadtree(points);
var draggedNode;
drag
.on("dragstart", function() {
draggedNode = selectedNode;
})
.on("drag", function() {
if (!draggedNode) return;
draggedNode.x = d3.event.x, draggedNode.y = d3.event.y;
circle(draggedNode);
force.start();
})
.on("dragend", function() {
draggedNode = null;
});
force.on("tick", function() {
ctx.clearRect(0,0,canvas.width,canvas.height);
points = graph.nodes.map(function(d) { return [d.x, d.y]; });
quad = quadtree(points);
ctx.strokeStyle = "rgba(150,150,150,0.6)";
ctx.lineWidth = 1;
ctx.beginPath();
graph.links.forEach(function(d) {
ctx.moveTo(d.source.x,d.source.y);
ctx.lineTo(d.target.x,d.target.y);
});
ctx.stroke();
ctx.strokeStyle = "#fff";
ctx.lineWidth = 1.5;
graph.nodes.forEach(function(d) {
circle(d,5);
});
});
d3.select(canvas).on("mousemove", function(x) {
var pos = d3.mouse(this);
var closestPoint = [Infinity, Infinity];
var minDistance = Infinity;
// search for closest point
quad.visit(function(quad, x1, y1, x2, y2) {
var rx1 = pos[0] - minDistance,
rx2 = pos[0] + minDistance,
ry1 = pos[1] - minDistance,
ry2 = pos[1] + minDistance;
if (p = quad.point) {
var p,
dx = pos[0] - p[0],
dy = pos[1] - p[1],
d2 = dx * dx + dy * dy,
d = Math.sqrt(d2);
if (d < minDistance) {
closestPoint = p;
minDistance = d;
}
}
return x1 > rx2 || x2 < rx1 || y1 > ry2 || y2 < ry1; // bounding box outside closest point
});
// render highlighted point
var closestPointIndex = points.indexOf(closestPoint);
selectedNode = graph.nodes[closestPointIndex];
ctx.strokeStyle = "rgba(150,150,150,0.6)";
circle(selectedNode, 5);
ctx.strokeStyle = "#fff";
})
.call(drag);
});
function circle(d,r) {
ctx.fillStyle = color(d.group);
ctx.beginPath();
ctx.arc(d.x,d.y,r,0,2*Math.PI);
ctx.fill();
ctx.stroke();
};
</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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