d3 force directed layout

_.md

[ Launch: Tributary inlet ] 6526707 by jpmarindiaz

config.json

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data.js

graph = {
  "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}
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}

inlet.js

var width  = 560;
var height = 500;
var margin = 20;
var pad = margin / 2;

var color = d3.scale.category20();

// Generates a tooltip for a SVG circle element based on its ID
function addTooltip(circle) {
    var x = parseFloat(circle.attr("cx"));
    var y = parseFloat(circle.attr("cy"));
    var r = parseFloat(circle.attr("r"));
    var text = circle.attr("id");

    var tooltip = d3.select("#plot")
        .append("text")
        .text(text)
        .attr("x", x)
        .attr("y", y)
        .attr("dy", -r * 2)
        .attr("id", "tooltip");

    var offset = tooltip.node().getBBox().width / 2;

    if ((x - offset) < 0) {
        tooltip.attr("text-anchor", "start");
        tooltip.attr("dx", -r);
    }
    else if ((x + offset) > (width - margin)) {
        tooltip.attr("text-anchor", "end");
        tooltip.attr("dx", r);
    }
    else {
        tooltip.attr("text-anchor", "middle");
        tooltip.attr("dx", 0);
    }
}

function drawGraph(graph) {
    var svg = d3.select("svg")
        .attr("width", width)
        .attr("height", height);

    // draw plot background
    svg.append("rect")
        .attr("width", width)
        .attr("height", height)
        .style("fill", "#eeeeee");

    // create an area within svg for plotting graph
    var plot = svg.append("g")
        .attr("id", "plot")
        .attr("transform", "translate(" + pad + ", " + pad + ")");

    // https://github.com/mbostock/d3/wiki/Force-Layout#wiki-force
    var layout = d3.layout.force()
        .size([width - margin, height - margin])
        .charge(-120)
        .linkDistance(function(d, i) {
            return (d.source.group == d.target.group) ? 50 : 100;
        })
        .nodes(graph.nodes)
        .links(graph.links)
        .start();

    drawLinks(graph.links);
    drawNodes(graph.nodes);

    // add ability to drag and update layout
    // https://github.com/mbostock/d3/wiki/Force-Layout#wiki-drag
    d3.selectAll(".node").call(layout.drag);

    // https://github.com/mbostock/d3/wiki/Force-Layout#wiki-on
    layout.on("tick", function() {
        d3.selectAll(".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; });

        d3.selectAll(".node")
            .attr("cx", function(d) { return d.x; })
            .attr("cy", function(d) { return d.y; });
    });
}

// Draws nodes on plot
function drawNodes(nodes) {
    // used to assign nodes color by group
    var color = d3.scale.category20();

    // https://github.com/mbostock/d3/wiki/Force-Layout#wiki-nodes
    d3.select("#plot").selectAll(".node")
        .data(nodes)
        .enter()
        .append("circle")
        .attr("class", "node")
        .attr("id", function(d, i) { return d.name; })
        .attr("cx", function(d, i) { return d.x; })
        .attr("cy", function(d, i) { return d.y; })
        .attr("r",  function(d, i) { return 4; })
        .style("fill",   function(d, i) { return color(d.group); })
        .on("mouseover", function(d, i) { addTooltip(d3.select(this)); })
        .on("mouseout",  function(d, i) { d3.select("#tooltip").remove(); });
}

// Draws edges between nodes
function drawLinks(links) {
    var scale = d3.scale.linear()
        .domain(d3.extent(links, function(d, i) {
           return d.value;
        }))
        .range([1, 6]);

    // https://github.com/mbostock/d3/wiki/Force-Layout#wiki-links
    d3.select("#plot").selectAll(".link")
        .data(links)
        .enter()
        .append("line")
        .attr("class", "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; })
        .style("stroke-width", function(d, i) {
            return scale(d.value) + "px";
        })
        .style("stroke-dasharray", function(d, i) {
            return (d.value <= 1) ? "2, 2" : "none";
        });

}

drawGraph(graph);

//d3.json("miserables.json", drawGraph);

style.css

body {
    font-family: 'Source Sans Pro', sans-serif;
    font-weight: 300;
}

b {
    font-weight: 900;
}

.outline {
    fill: none;
    stroke: #888888;
    stroke-width: 1px;
}

#tooltip {
    font-size: 10pt;
    font-weight: 900;

    fill: #000000;
    stroke: #ffffff;
    stroke-width: 0.25px;
}

.node {
    stroke: #ffffff;
    stroke-weight: 1px;
}

.link {
    fill: none;
    stroke: #888888;
    stroke-weight: 1px;
    stroke-opacity: 0.5;
}

.highlight {
    stroke: red;
    stroke-weight: 4px;
    stroke-opacity: 1.0;
}