graphSub/ramzaneh.html at master · karimmac/graphSub · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<style>

.node {
  stroke: #fff;
  stroke-width: 1.5px;
}

.link {
  stroke: #999;
  stroke-opacity: .6;
}

</style>
<body>
  <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-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 svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var buildLinksFromNodeIds = function(nodeIds, links) {
  var indexById = _.reduce(nodeIds, function(m, v, i) { m[v] = i; return m; }, {})

  return _.map(links, function(v) {
    return {source: indexById[v.source], target: indexById[v.target]};
  });
};

// Inputs:
//  nodes . . [{id: ###, ..}, ..]
//  links . . [{target: node.id, ..}, ..]
//
// Output:
//  nodes . . <minimal subset of nodes>
//  links . . [{source: i, target: j}, ..] (unique links)
var formatGraphForD3 = function(nodes, links) {
  links = _.uniq(links);
  var linkedNodeIds = _.chain(links)
    .map(function(v) { return [v.source, v.target]; })
    .flatten()
    .uniq()
    .value();

  links = buildLinksFromNodeIds(linkedNodeIds, links);
  var indexById = _.reduce(nodes, function(m, v, i) { m[v.id] = i; return m; }, {});
  var linkedNodes = _.map(linkedNodeIds, function(i) {
    return nodes[indexById[i]];
  });

  return { nodes: linkedNodes, links: links };
};

// Build out a D3-ready subgraph
//
// Inputs:
//  nodes  . . . [{id: ###, ..}, ..]
//  links  . . . [{target: node.id, ..}, ..]
//  rootId . . . root node id
//  distance . . number of connections to build out
//
// Output:
//  nodes . . <minimal subset of nodes>
//  links . . [{source: i, target: j}, ..] (unique links)
var buildSubGraph = function(nodes, links, rootId, distance) {
  var sourceLinks = [{source: rootId, target: rootId}];

  // A really naive algorithm: we're not yet worrying
  // too much about optimising for already-visited links.
  var subGraphLinks = [];
  for (var i = 0; i < distance; ++i) {
    var targetLinks = _.reduce(sourceLinks, function(m, v) {
      m = m.concat(_.where(links, {source: v.target}));
      return m;
    }, []);
    subGraphLinks = subGraphLinks.concat(targetLinks);
    sourceLinks = targetLinks;
  }

  return formatGraphForD3(nodes, subGraphLinks);
};

var test = function(n, i){
  console.log('Node: ' + JSON.stringify({id: n.id, label: n.label}), i);
};

d3.json("data/ramzaneh.json", function(error, graph) {
  var subGraph = buildSubGraph(graph.nodes, graph.edges, '27', 3);

  force
    .nodes(subGraph.nodes)
    .links(subGraph.links)
    .start();

  var link = svg.selectAll(".link")
    .data(subGraph.links)
    .enter().append("line")
    .attr("class", "link")
    .style("stroke-width", function(d) { return Math.sqrt(d.value); });

  var node = svg.selectAll(".node")
    .data(subGraph.nodes)
    .enter().append("circle")
    .attr("class", "node")
    .attr("r", 5)
    .style("fill", function(d) { return color(d.group); })
    .on('click', test)
    .call(force.drag);

  node.append("title")
    .text(function(d) { return d.label; });

  force.on("tick", function() {
    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; });

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

</script>