This D3 version 3 example shows how to constrain the position of nodes within the rectangular bounds of the containing SVG element. As a side-effect of updating the node’s “cx” and “cy” attributes, we update the node positions to be within the range [radius, width - radius] for x, [radius, height - radius] for y. If you prefer, you could use the each operator to do this as a separate step, rather than as a side-effect of setting attributes.
forked from mbostock‘s block: Bounded Force Layout
<!DOCTYPE html>
<meta charset="utf-8">
<style>
circle {
stroke-width: 1.5px;
}
line {
stroke: #999;
}
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>
var width = 130,
height = 130,
radius = 6;
var fill = d3.scale.category20();
var force = d3.layout.force()
.gravity(.05)
.charge(-240)
.linkDistance(50)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("graph.json", function(error, graph) {
if (error) throw error;
var link = svg.selectAll("line")
.data(graph.links)
.enter().append("line");
var node = svg.selectAll("circle")
.data(graph.nodes)
.enter().append("circle")
.attr("r", radius - .75)
.style("fill", function(d) { return fill(d.group); })
.style("stroke", function(d) { return d3.rgb(fill(d.group)).darker(); })
.call(force.drag);
force
.nodes(graph.nodes)
.links(graph.links)
.on("tick", tick)
.start();
var strength = 20;
function tick() {
node.attr("cx", function(d) { return d.x += Math.min(3, Math.exp((radius-d.x)/strength)) - Math.min(3, Math.exp((radius-width+d.x)/strength)); })
.attr("cy", function(d) { return d.y += Math.min(3, Math.exp((radius-d.y)/strength)) - Math.min(3, Math.exp((radius-height+d.y)/strength)); });
link.attr("x1", function(d) { return d.source.x; })
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d) { return d.target.y; });
}
});
</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},
{"source": 5, "target": 0, "value": 1},
{"source": 6, "target": 0, "value": 1},
{"source": 7, "target": 0, "value": 1},
{"source": 8, "target": 0, "value": 2},
{"source": 9, "target": 0, "value": 1},
{"source": 11, "target": 10, "value": 1},
{"source": 11, "target": 3, "value": 3},
{"source": 11, "target": 2, "value": 3},
{"source": 11, "target": 0, "value": 5},
{"source": 12, "target": 11, "value": 1},
{"source": 13, "target": 11, "value": 1},
{"source": 14, "target": 11, "value": 1},
{"source": 15, "target": 11, "value": 1},
{"source": 17, "target": 16, "value": 4},
{"source": 18, "target": 16, "value": 4},
{"source": 18, "target": 17, "value": 4},
{"source": 19, "target": 16, "value": 4},
{"source": 19, "target": 17, "value": 4},
{"source": 19, "target": 18, "value": 4},
{"source": 20, "target": 16, "value": 3},
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{"source": 20, "target": 19, "value": 4},
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{"source": 22, "target": 20, "value": 4},
{"source": 22, "target": 21, "value": 4},
{"source": 23, "target": 16, "value": 3},
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{"source": 23, "target": 19, "value": 3},
{"source": 23, "target": 20, "value": 4},
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{"source": 23, "target": 22, "value": 4},
{"source": 23, "target": 12, "value": 2},
{"source": 23, "target": 11, "value": 9},
{"source": 24, "target": 23, "value": 2},
{"source": 24, "target": 11, "value": 7},
{"source": 25, "target": 24, "value": 13},
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{"source": 25, "target": 11, "value": 12},
{"source": 26, "target": 24, "value": 4},
{"source": 26, "target": 11, "value": 31},
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]
}