michaschwab/.block

## .block
license: gpl-3.0
height: 600

## README.md

      
    Raw
  

              README.md
            
          
    This is a starting point for learning how to code coordinated views. d3.dispatch should be used to communicate across visualizations, and it is already being used to communicate the loading of the initial data.
The simple force-directed graph shows character co-occurence in Les Misérables. A physical simulation of charged particles and springs places related characters in closer proximity, while unrelated characters are farther apart. Layout algorithm inspired by Tim Dwyer and Thomas Jakobsen. Data based on character coappearence in Victor Hugo's Les Misérables, compiled by Donald Knuth.

  
## data.js
var dispatch = d3.dispatch("dataLoaded");

d3.json("miserables.json", function(error, data)
{
    if (error) throw error;
    else
        dispatch.call('dataLoaded', null, data);
});

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

.links line {
  stroke: #999;
  stroke-opacity: 0.6;
}

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

</style>
<svg id="nodelink" width="600" height="600"></svg>
<svg id="piechart" width="600" height="600"></svg>

<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="data.js"></script>
<script src="nodelink.js"></script>
<script src="piechart.js"></script>

## miserables.json
{
  "nodes": [
    {"id": "Myriel", "group": 1},
    {"id": "Napoleon", "group": 1},
    {"id": "Mlle.Baptistine", "group": 1},
    {"id": "Mme.Magloire", "group": 1},
    {"id": "CountessdeLo", "group": 1},
    {"id": "Geborand", "group": 1},
    {"id": "Champtercier", "group": 1},
    {"id": "Cravatte", "group": 1},
    {"id": "Count", "group": 1},
    {"id": "OldMan", "group": 1},
    {"id": "Labarre", "group": 2},
    {"id": "Valjean", "group": 2},
    {"id": "Marguerite", "group": 3},
    {"id": "Mme.deR", "group": 2},
    {"id": "Isabeau", "group": 2},
    {"id": "Gervais", "group": 2},
    {"id": "Tholomyes", "group": 3},
    {"id": "Listolier", "group": 3},
    {"id": "Fameuil", "group": 3},
    {"id": "Blacheville", "group": 3},
    {"id": "Favourite", "group": 3},
    {"id": "Dahlia", "group": 3},
    {"id": "Zephine", "group": 3},
    {"id": "Fantine", "group": 3},
    {"id": "Mme.Thenardier", "group": 4},
    {"id": "Thenardier", "group": 4},
    {"id": "Cosette", "group": 5},
    {"id": "Javert", "group": 4},
    {"id": "Fauchelevent", "group": 0},
    {"id": "Bamatabois", "group": 2},
    {"id": "Perpetue", "group": 3},
    {"id": "Simplice", "group": 2},
    {"id": "Scaufflaire", "group": 2},
    {"id": "Woman1", "group": 2},
    {"id": "Judge", "group": 2},
    {"id": "Champmathieu", "group": 2},
    {"id": "Brevet", "group": 2},
    {"id": "Chenildieu", "group": 2},
    {"id": "Cochepaille", "group": 2},
    {"id": "Pontmercy", "group": 4},
    {"id": "Boulatruelle", "group": 6},
    {"id": "Eponine", "group": 4},
    {"id": "Anzelma", "group": 4},
    {"id": "Woman2", "group": 5},
    {"id": "MotherInnocent", "group": 0},
    {"id": "Gribier", "group": 0},
    {"id": "Jondrette", "group": 7},
    {"id": "Mme.Burgon", "group": 7},
    {"id": "Gavroche", "group": 8},
    {"id": "Gillenormand", "group": 5},
    {"id": "Magnon", "group": 5},
    {"id": "Mlle.Gillenormand", "group": 5},
    {"id": "Mme.Pontmercy", "group": 5},
    {"id": "Mlle.Vaubois", "group": 5},
    {"id": "Lt.Gillenormand", "group": 5},
    {"id": "Marius", "group": 8},
    {"id": "BaronessT", "group": 5},
    {"id": "Mabeuf", "group": 8},
    {"id": "Enjolras", "group": 8},
    {"id": "Combeferre", "group": 8},
    {"id": "Prouvaire", "group": 8},
    {"id": "Feuilly", "group": 8},
    {"id": "Courfeyrac", "group": 8},
    {"id": "Bahorel", "group": 8},
    {"id": "Bossuet", "group": 8},
    {"id": "Joly", "group": 8},
    {"id": "Grantaire", "group": 8},
    {"id": "MotherPlutarch", "group": 9},
    {"id": "Gueulemer", "group": 4},
    {"id": "Babet", "group": 4},
    {"id": "Claquesous", "group": 4},
    {"id": "Montparnasse", "group": 4},
    {"id": "Toussaint", "group": 5},
    {"id": "Child1", "group": 10},
    {"id": "Child2", "group": 10},
    {"id": "Brujon", "group": 4},
    {"id": "Mme.Hucheloup", "group": 8}
  ],
  "links": [
    {"source": "Napoleon", "target": "Myriel", "value": 1},
    {"source": "Mlle.Baptistine", "target": "Myriel", "value": 8},
    {"source": "Mme.Magloire", "target": "Myriel", "value": 10},
    {"source": "Mme.Magloire", "target": "Mlle.Baptistine", "value": 6},
    {"source": "CountessdeLo", "target": "Myriel", "value": 1},
    {"source": "Geborand", "target": "Myriel", "value": 1},
    {"source": "Champtercier", "target": "Myriel", "value": 1},
    {"source": "Cravatte", "target": "Myriel", "value": 1},
    {"source": "Count", "target": "Myriel", "value": 2},
    {"source": "OldMan", "target": "Myriel", "value": 1},
    {"source": "Valjean", "target": "Labarre", "value": 1},
    {"source": "Valjean", "target": "Mme.Magloire", "value": 3},
    {"source": "Valjean", "target": "Mlle.Baptistine", "value": 3},
    {"source": "Valjean", "target": "Myriel", "value": 5},
    {"source": "Marguerite", "target": "Valjean", "value": 1},
    {"source": "Mme.deR", "target": "Valjean", "value": 1},
    {"source": "Isabeau", "target": "Valjean", "value": 1},
    {"source": "Gervais", "target": "Valjean", "value": 1},
    {"source": "Listolier", "target": "Tholomyes", "value": 4},
    {"source": "Fameuil", "target": "Tholomyes", "value": 4},
    {"source": "Fameuil", "target": "Listolier", "value": 4},
    {"source": "Blacheville", "target": "Tholomyes", "value": 4},
    {"source": "Blacheville", "target": "Listolier", "value": 4},
    {"source": "Blacheville", "target": "Fameuil", "value": 4},
    {"source": "Favourite", "target": "Tholomyes", "value": 3},
    {"source": "Favourite", "target": "Listolier", "value": 3},
    {"source": "Favourite", "target": "Fameuil", "value": 3},
    {"source": "Favourite", "target": "Blacheville", "value": 4},
    {"source": "Dahlia", "target": "Tholomyes", "value": 3},
    {"source": "Dahlia", "target": "Listolier", "value": 3},
    {"source": "Dahlia", "target": "Fameuil", "value": 3},
    {"source": "Dahlia", "target": "Blacheville", "value": 3},
    {"source": "Dahlia", "target": "Favourite", "value": 5},
    {"source": "Zephine", "target": "Tholomyes", "value": 3},
    {"source": "Zephine", "target": "Listolier", "value": 3},
    {"source": "Zephine", "target": "Fameuil", "value": 3},
    {"source": "Zephine", "target": "Blacheville", "value": 3},
    {"source": "Zephine", "target": "Favourite", "value": 4},
    {"source": "Zephine", "target": "Dahlia", "value": 4},
    {"source": "Fantine", "target": "Tholomyes", "value": 3},
    {"source": "Fantine", "target": "Listolier", "value": 3},
    {"source": "Fantine", "target": "Fameuil", "value": 3},
    {"source": "Fantine", "target": "Blacheville", "value": 3},
    {"source": "Fantine", "target": "Favourite", "value": 4},
    {"source": "Fantine", "target": "Dahlia", "value": 4},
    {"source": "Fantine", "target": "Zephine", "value": 4},
    {"source": "Fantine", "target": "Marguerite", "value": 2},
    {"source": "Fantine", "target": "Valjean", "value": 9},
    {"source": "Mme.Thenardier", "target": "Fantine", "value": 2},
    {"source": "Mme.Thenardier", "target": "Valjean", "value": 7},
    {"source": "Thenardier", "target": "Mme.Thenardier", "value": 13},
    {"source": "Thenardier", "target": "Fantine", "value": 1},
    {"source": "Thenardier", "target": "Valjean", "value": 12},
    {"source": "Cosette", "target": "Mme.Thenardier", "value": 4},
    {"source": "Cosette", "target": "Valjean", "value": 31},
    {"source": "Cosette", "target": "Tholomyes", "value": 1},
    {"source": "Cosette", "target": "Thenardier", "value": 1},
    {"source": "Javert", "target": "Valjean", "value": 17},
    {"source": "Javert", "target": "Fantine", "value": 5},
    {"source": "Javert", "target": "Thenardier", "value": 5},
    {"source": "Javert", "target": "Mme.Thenardier", "value": 1},
    {"source": "Javert", "target": "Cosette", "value": 1},
    {"source": "Fauchelevent", "target": "Valjean", "value": 8},
    {"source": "Fauchelevent", "target": "Javert", "value": 1},
    {"source": "Bamatabois", "target": "Fantine", "value": 1},
    {"source": "Bamatabois", "target": "Javert", "value": 1},
    {"source": "Bamatabois", "target": "Valjean", "value": 2},
    {"source": "Perpetue", "target": "Fantine", "value": 1},
    {"source": "Simplice", "target": "Perpetue", "value": 2},
    {"source": "Simplice", "target": "Valjean", "value": 3},
    {"source": "Simplice", "target": "Fantine", "value": 2},
    {"source": "Simplice", "target": "Javert", "value": 1},
    {"source": "Scaufflaire", "target": "Valjean", "value": 1},
    {"source": "Woman1", "target": "Valjean", "value": 2},
    {"source": "Woman1", "target": "Javert", "value": 1},
    {"source": "Judge", "target": "Valjean", "value": 3},
    {"source": "Judge", "target": "Bamatabois", "value": 2},
    {"source": "Champmathieu", "target": "Valjean", "value": 3},
    {"source": "Champmathieu", "target": "Judge", "value": 3},
    {"source": "Champmathieu", "target": "Bamatabois", "value": 2},
    {"source": "Brevet", "target": "Judge", "value": 2},
    {"source": "Brevet", "target": "Champmathieu", "value": 2},
    {"source": "Brevet", "target": "Valjean", "value": 2},
    {"source": "Brevet", "target": "Bamatabois", "value": 1},
    {"source": "Chenildieu", "target": "Judge", "value": 2},
    {"source": "Chenildieu", "target": "Champmathieu", "value": 2},
    {"source": "Chenildieu", "target": "Brevet", "value": 2},
    {"source": "Chenildieu", "target": "Valjean", "value": 2},
    {"source": "Chenildieu", "target": "Bamatabois", "value": 1},
    {"source": "Cochepaille", "target": "Judge", "value": 2},
    {"source": "Cochepaille", "target": "Champmathieu", "value": 2},
    {"source": "Cochepaille", "target": "Brevet", "value": 2},
    {"source": "Cochepaille", "target": "Chenildieu", "value": 2},
    {"source": "Cochepaille", "target": "Valjean", "value": 2},
    {"source": "Cochepaille", "target": "Bamatabois", "value": 1},
    {"source": "Pontmercy", "target": "Thenardier", "value": 1},
    {"source": "Boulatruelle", "target": "Thenardier", "value": 1},
    {"source": "Eponine", "target": "Mme.Thenardier", "value": 2},
    {"source": "Eponine", "target": "Thenardier", "value": 3},
    {"source": "Anzelma", "target": "Eponine", "value": 2},
    {"source": "Anzelma", "target": "Thenardier", "value": 2},
    {"source": "Anzelma", "target": "Mme.Thenardier", "value": 1},
    {"source": "Woman2", "target": "Valjean", "value": 3},
    {"source": "Woman2", "target": "Cosette", "value": 1},
    {"source": "Woman2", "target": "Javert", "value": 1},
    {"source": "MotherInnocent", "target": "Fauchelevent", "value": 3},
    {"source": "MotherInnocent", "target": "Valjean", "value": 1},
    {"source": "Gribier", "target": "Fauchelevent", "value": 2},
    {"source": "Mme.Burgon", "target": "Jondrette", "value": 1},
    {"source": "Gavroche", "target": "Mme.Burgon", "value": 2},
    {"source": "Gavroche", "target": "Thenardier", "value": 1},
    {"source": "Gavroche", "target": "Javert", "value": 1},
    {"source": "Gavroche", "target": "Valjean", "value": 1},
    {"source": "Gillenormand", "target": "Cosette", "value": 3},
    {"source": "Gillenormand", "target": "Valjean", "value": 2},
    {"source": "Magnon", "target": "Gillenormand", "value": 1},
    {"source": "Magnon", "target": "Mme.Thenardier", "value": 1},
    {"source": "Mlle.Gillenormand", "target": "Gillenormand", "value": 9},
    {"source": "Mlle.Gillenormand", "target": "Cosette", "value": 2},
    {"source": "Mlle.Gillenormand", "target": "Valjean", "value": 2},
    {"source": "Mme.Pontmercy", "target": "Mlle.Gillenormand", "value": 1},
    {"source": "Mme.Pontmercy", "target": "Pontmercy", "value": 1},
    {"source": "Mlle.Vaubois", "target": "Mlle.Gillenormand", "value": 1},
    {"source": "Lt.Gillenormand", "target": "Mlle.Gillenormand", "value": 2},
    {"source": "Lt.Gillenormand", "target": "Gillenormand", "value": 1},
    {"source": "Lt.Gillenormand", "target": "Cosette", "value": 1},
    {"source": "Marius", "target": "Mlle.Gillenormand", "value": 6},
    {"source": "Marius", "target": "Gillenormand", "value": 12},
    {"source": "Marius", "target": "Pontmercy", "value": 1},
    {"source": "Marius", "target": "Lt.Gillenormand", "value": 1},
    {"source": "Marius", "target": "Cosette", "value": 21},
    {"source": "Marius", "target": "Valjean", "value": 19},
    {"source": "Marius", "target": "Tholomyes", "value": 1},
    {"source": "Marius", "target": "Thenardier", "value": 2},
    {"source": "Marius", "target": "Eponine", "value": 5},
    {"source": "Marius", "target": "Gavroche", "value": 4},
    {"source": "BaronessT", "target": "Gillenormand", "value": 1},
    {"source": "BaronessT", "target": "Marius", "value": 1},
    {"source": "Mabeuf", "target": "Marius", "value": 1},
    {"source": "Mabeuf", "target": "Eponine", "value": 1},
    {"source": "Mabeuf", "target": "Gavroche", "value": 1},
    {"source": "Enjolras", "target": "Marius", "value": 7},
    {"source": "Enjolras", "target": "Gavroche", "value": 7},
    {"source": "Enjolras", "target": "Javert", "value": 6},
    {"source": "Enjolras", "target": "Mabeuf", "value": 1},
    {"source": "Enjolras", "target": "Valjean", "value": 4},
    {"source": "Combeferre", "target": "Enjolras", "value": 15},
    {"source": "Combeferre", "target": "Marius", "value": 5},
    {"source": "Combeferre", "target": "Gavroche", "value": 6},
    {"source": "Combeferre", "target": "Mabeuf", "value": 2},
    {"source": "Prouvaire", "target": "Gavroche", "value": 1},
    {"source": "Prouvaire", "target": "Enjolras", "value": 4},
    {"source": "Prouvaire", "target": "Combeferre", "value": 2},
    {"source": "Feuilly", "target": "Gavroche", "value": 2},
    {"source": "Feuilly", "target": "Enjolras", "value": 6},
    {"source": "Feuilly", "target": "Prouvaire", "value": 2},
    {"source": "Feuilly", "target": "Combeferre", "value": 5},
    {"source": "Feuilly", "target": "Mabeuf", "value": 1},
    {"source": "Feuilly", "target": "Marius", "value": 1},
    {"source": "Courfeyrac", "target": "Marius", "value": 9},
    {"source": "Courfeyrac", "target": "Enjolras", "value": 17},
    {"source": "Courfeyrac", "target": "Combeferre", "value": 13},
    {"source": "Courfeyrac", "target": "Gavroche", "value": 7},
    {"source": "Courfeyrac", "target": "Mabeuf", "value": 2},
    {"source": "Courfeyrac", "target": "Eponine", "value": 1},
    {"source": "Courfeyrac", "target": "Feuilly", "value": 6},
    {"source": "Courfeyrac", "target": "Prouvaire", "value": 3},
    {"source": "Bahorel", "target": "Combeferre", "value": 5},
    {"source": "Bahorel", "target": "Gavroche", "value": 5},
    {"source": "Bahorel", "target": "Courfeyrac", "value": 6},
    {"source": "Bahorel", "target": "Mabeuf", "value": 2},
    {"source": "Bahorel", "target": "Enjolras", "value": 4},
    {"source": "Bahorel", "target": "Feuilly", "value": 3},
    {"source": "Bahorel", "target": "Prouvaire", "value": 2},
    {"source": "Bahorel", "target": "Marius", "value": 1},
    {"source": "Bossuet", "target": "Marius", "value": 5},
    {"source": "Bossuet", "target": "Courfeyrac", "value": 12},
    {"source": "Bossuet", "target": "Gavroche", "value": 5},
    {"source": "Bossuet", "target": "Bahorel", "value": 4},
    {"source": "Bossuet", "target": "Enjolras", "value": 10},
    {"source": "Bossuet", "target": "Feuilly", "value": 6},
    {"source": "Bossuet", "target": "Prouvaire", "value": 2},
    {"source": "Bossuet", "target": "Combeferre", "value": 9},
    {"source": "Bossuet", "target": "Mabeuf", "value": 1},
    {"source": "Bossuet", "target": "Valjean", "value": 1},
    {"source": "Joly", "target": "Bahorel", "value": 5},
    {"source": "Joly", "target": "Bossuet", "value": 7},
    {"source": "Joly", "target": "Gavroche", "value": 3},
    {"source": "Joly", "target": "Courfeyrac", "value": 5},
    {"source": "Joly", "target": "Enjolras", "value": 5},
    {"source": "Joly", "target": "Feuilly", "value": 5},
    {"source": "Joly", "target": "Prouvaire", "value": 2},
    {"source": "Joly", "target": "Combeferre", "value": 5},
    {"source": "Joly", "target": "Mabeuf", "value": 1},
    {"source": "Joly", "target": "Marius", "value": 2},
    {"source": "Grantaire", "target": "Bossuet", "value": 3},
    {"source": "Grantaire", "target": "Enjolras", "value": 3},
    {"source": "Grantaire", "target": "Combeferre", "value": 1},
    {"source": "Grantaire", "target": "Courfeyrac", "value": 2},
    {"source": "Grantaire", "target": "Joly", "value": 2},
    {"source": "Grantaire", "target": "Gavroche", "value": 1},
    {"source": "Grantaire", "target": "Bahorel", "value": 1},
    {"source": "Grantaire", "target": "Feuilly", "value": 1},
    {"source": "Grantaire", "target": "Prouvaire", "value": 1},
    {"source": "MotherPlutarch", "target": "Mabeuf", "value": 3},
    {"source": "Gueulemer", "target": "Thenardier", "value": 5},
    {"source": "Gueulemer", "target": "Valjean", "value": 1},
    {"source": "Gueulemer", "target": "Mme.Thenardier", "value": 1},
    {"source": "Gueulemer", "target": "Javert", "value": 1},
    {"source": "Gueulemer", "target": "Gavroche", "value": 1},
    {"source": "Gueulemer", "target": "Eponine", "value": 1},
    {"source": "Babet", "target": "Thenardier", "value": 6},
    {"source": "Babet", "target": "Gueulemer", "value": 6},
    {"source": "Babet", "target": "Valjean", "value": 1},
    {"source": "Babet", "target": "Mme.Thenardier", "value": 1},
    {"source": "Babet", "target": "Javert", "value": 2},
    {"source": "Babet", "target": "Gavroche", "value": 1},
    {"source": "Babet", "target": "Eponine", "value": 1},
    {"source": "Claquesous", "target": "Thenardier", "value": 4},
    {"source": "Claquesous", "target": "Babet", "value": 4},
    {"source": "Claquesous", "target": "Gueulemer", "value": 4},
    {"source": "Claquesous", "target": "Valjean", "value": 1},
    {"source": "Claquesous", "target": "Mme.Thenardier", "value": 1},
    {"source": "Claquesous", "target": "Javert", "value": 1},
    {"source": "Claquesous", "target": "Eponine", "value": 1},
    {"source": "Claquesous", "target": "Enjolras", "value": 1},
    {"source": "Montparnasse", "target": "Javert", "value": 1},
    {"source": "Montparnasse", "target": "Babet", "value": 2},
    {"source": "Montparnasse", "target": "Gueulemer", "value": 2},
    {"source": "Montparnasse", "target": "Claquesous", "value": 2},
    {"source": "Montparnasse", "target": "Valjean", "value": 1},
    {"source": "Montparnasse", "target": "Gavroche", "value": 1},
    {"source": "Montparnasse", "target": "Eponine", "value": 1},
    {"source": "Montparnasse", "target": "Thenardier", "value": 1},
    {"source": "Toussaint", "target": "Cosette", "value": 2},
    {"source": "Toussaint", "target": "Javert", "value": 1},
    {"source": "Toussaint", "target": "Valjean", "value": 1},
    {"source": "Child1", "target": "Gavroche", "value": 2},
    {"source": "Child2", "target": "Gavroche", "value": 2},
    {"source": "Child2", "target": "Child1", "value": 3},
    {"source": "Brujon", "target": "Babet", "value": 3},
    {"source": "Brujon", "target": "Gueulemer", "value": 3},
    {"source": "Brujon", "target": "Thenardier", "value": 3},
    {"source": "Brujon", "target": "Gavroche", "value": 1},
    {"source": "Brujon", "target": "Eponine", "value": 1},
    {"source": "Brujon", "target": "Claquesous", "value": 1},
    {"source": "Brujon", "target": "Montparnasse", "value": 1},
    {"source": "Mme.Hucheloup", "target": "Bossuet", "value": 1},
    {"source": "Mme.Hucheloup", "target": "Joly", "value": 1},
    {"source": "Mme.Hucheloup", "target": "Grantaire", "value": 1},
    {"source": "Mme.Hucheloup", "target": "Bahorel", "value": 1},
    {"source": "Mme.Hucheloup", "target": "Courfeyrac", "value": 1},
    {"source": "Mme.Hucheloup", "target": "Gavroche", "value": 1},
    {"source": "Mme.Hucheloup", "target": "Enjolras", "value": 1}
  ]
}

## nodelink.js

var nodelinkSvg = d3.select("#nodelink"),
    width = +nodelinkSvg.attr("width"),
    height = +nodelinkSvg.attr("height");

var color = d3.scaleOrdinal(d3.schemeCategory20);

var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().id(function(d) { return d.id; }))
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(width / 2, height / 2));

dispatch.on("dataLoaded.nodelink", function(graph)
{
    var link = nodelinkSvg.append("g")
        .attr("class", "links")
        .selectAll("line")
        .data(graph.links)
        .enter().append("line")
        .attr("stroke-width", function(d) { return Math.sqrt(d.value); });

    var node = nodelinkSvg.append("g")
        .attr("class", "nodes")
        .selectAll("circle")
        .data(graph.nodes)
        .enter().append("circle")
        .attr("r", 5)
        .attr("fill", function(d) { return color(d.group); })
        .call(d3.drag()
            .on("start", dragstarted)
            .on("drag", dragged)
            .on("end", dragended));

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

    simulation
        .nodes(graph.nodes)
        .on("tick", ticked);

    simulation.force("link")
        .links(graph.links);

    function ticked() {
        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; });
    }
});

function dragstarted(d) {
    if (!d3.event.active) simulation.alphaTarget(0.3).restart();
    d.fx = d.x;
    d.fy = d.y;
}

function dragged(d) {
    d.fx = d3.event.x;
    d.fy = d3.event.y;
}

function dragended(d) {
    if (!d3.event.active) simulation.alphaTarget(0);
    d.fx = null;
    d.fy = null;
}

## piechart.js
var svg = d3.select("#piechart"),
    width = +svg.attr("width"),
    height = +svg.attr("height"),
    radius = Math.min(width, height) / 2,
    g = svg.append("g").attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

var color = d3.scaleOrdinal(d3.schemeCategory20);

var pie = d3.pie()
    .sort(null)
    .value(function(d) { return d.count; });

var path = d3.arc()
    .outerRadius(radius - 10)
    .innerRadius(0);

var label = d3.arc()
    .outerRadius(radius - 40)
    .innerRadius(radius - 40);

dispatch.on("dataLoaded.pie", function(data) {

    var groupsDataObject = {};
    for(var i = 0; i < data.nodes.length; i++)
    {
        var character = data.nodes[i];
        if(!groupsDataObject[character.group])
            groupsDataObject[character.group] = [];
        groupsDataObject[character.group].push(character);
    }
    var groupsData = [];
    for(var groupId in groupsDataObject)
    {
        groupsData.push({groupId: parseInt(groupId), count: groupsDataObject[groupId].length});
    }

    var arc = g.selectAll(".arc")
        .data(pie(groupsData))
        .enter().append("g")
        .attr("class", "arc");

    arc.append("path")
        .attr("d", path)
        .attr("fill", function(d) { return color(d.data.groupId); });

    arc.append("text")
        .attr("transform", function(d) { return "translate(" + label.centroid(d) + ")"; })
        .attr("dy", "0.35em")
        .text(function(d) { return d.data.age; });
});
	var dispatch = d3.dispatch("dataLoaded");

	d3.json("miserables.json", function(error, data)
	{
	if (error) throw error;
	else
	dispatch.call('dataLoaded', null, data);
	});
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.links line {
	stroke: #999;
	stroke-opacity: 0.6;
	}

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

	</style>
	<svg id="nodelink" width="600" height="600"></svg>
	<svg id="piechart" width="600" height="600"></svg>

	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script src="data.js"></script>
	<script src="nodelink.js"></script>
	<script src="piechart.js"></script>
	{
	"nodes": [
	{"id": "Myriel", "group": 1},
	{"id": "Napoleon", "group": 1},
	{"id": "Mlle.Baptistine", "group": 1},
	{"id": "Mme.Magloire", "group": 1},
	{"id": "CountessdeLo", "group": 1},
	{"id": "Geborand", "group": 1},
	{"id": "Champtercier", "group": 1},
	{"id": "Cravatte", "group": 1},
	{"id": "Count", "group": 1},
	{"id": "OldMan", "group": 1},
	{"id": "Labarre", "group": 2},
	{"id": "Valjean", "group": 2},
	{"id": "Marguerite", "group": 3},
	{"id": "Mme.deR", "group": 2},
	{"id": "Isabeau", "group": 2},
	{"id": "Gervais", "group": 2},
	{"id": "Tholomyes", "group": 3},
	{"id": "Listolier", "group": 3},
	{"id": "Fameuil", "group": 3},
	{"id": "Blacheville", "group": 3},
	{"id": "Favourite", "group": 3},
	{"id": "Dahlia", "group": 3},
	{"id": "Zephine", "group": 3},
	{"id": "Fantine", "group": 3},
	{"id": "Mme.Thenardier", "group": 4},
	{"id": "Thenardier", "group": 4},
	{"id": "Cosette", "group": 5},
	{"id": "Javert", "group": 4},
	{"id": "Fauchelevent", "group": 0},
	{"id": "Bamatabois", "group": 2},
	{"id": "Perpetue", "group": 3},
	{"id": "Simplice", "group": 2},
	{"id": "Scaufflaire", "group": 2},
	{"id": "Woman1", "group": 2},
	{"id": "Judge", "group": 2},
	{"id": "Champmathieu", "group": 2},
	{"id": "Brevet", "group": 2},
	{"id": "Chenildieu", "group": 2},
	{"id": "Cochepaille", "group": 2},
	{"id": "Pontmercy", "group": 4},
	{"id": "Boulatruelle", "group": 6},
	{"id": "Eponine", "group": 4},
	{"id": "Anzelma", "group": 4},
	{"id": "Woman2", "group": 5},
	{"id": "MotherInnocent", "group": 0},
	{"id": "Gribier", "group": 0},
	{"id": "Jondrette", "group": 7},
	{"id": "Mme.Burgon", "group": 7},
	{"id": "Gavroche", "group": 8},
	{"id": "Gillenormand", "group": 5},
	{"id": "Magnon", "group": 5},
	{"id": "Mlle.Gillenormand", "group": 5},
	{"id": "Mme.Pontmercy", "group": 5},
	{"id": "Mlle.Vaubois", "group": 5},
	{"id": "Lt.Gillenormand", "group": 5},
	{"id": "Marius", "group": 8},
	{"id": "BaronessT", "group": 5},
	{"id": "Mabeuf", "group": 8},
	{"id": "Enjolras", "group": 8},
	{"id": "Combeferre", "group": 8},
	{"id": "Prouvaire", "group": 8},
	{"id": "Feuilly", "group": 8},
	{"id": "Courfeyrac", "group": 8},
	{"id": "Bahorel", "group": 8},
	{"id": "Bossuet", "group": 8},
	{"id": "Joly", "group": 8},
	{"id": "Grantaire", "group": 8},
	{"id": "MotherPlutarch", "group": 9},
	{"id": "Gueulemer", "group": 4},
	{"id": "Babet", "group": 4},
	{"id": "Claquesous", "group": 4},
	{"id": "Montparnasse", "group": 4},
	{"id": "Toussaint", "group": 5},
	{"id": "Child1", "group": 10},
	{"id": "Child2", "group": 10},
	{"id": "Brujon", "group": 4},
	{"id": "Mme.Hucheloup", "group": 8}
	],
	"links": [
	{"source": "Napoleon", "target": "Myriel", "value": 1},
	{"source": "Mlle.Baptistine", "target": "Myriel", "value": 8},
	{"source": "Mme.Magloire", "target": "Myriel", "value": 10},
	{"source": "Mme.Magloire", "target": "Mlle.Baptistine", "value": 6},
	{"source": "CountessdeLo", "target": "Myriel", "value": 1},
	{"source": "Geborand", "target": "Myriel", "value": 1},
	{"source": "Champtercier", "target": "Myriel", "value": 1},
	{"source": "Cravatte", "target": "Myriel", "value": 1},
	{"source": "Count", "target": "Myriel", "value": 2},
	{"source": "OldMan", "target": "Myriel", "value": 1},
	{"source": "Valjean", "target": "Labarre", "value": 1},
	{"source": "Valjean", "target": "Mme.Magloire", "value": 3},
	{"source": "Valjean", "target": "Mlle.Baptistine", "value": 3},
	{"source": "Valjean", "target": "Myriel", "value": 5},
	{"source": "Marguerite", "target": "Valjean", "value": 1},
	{"source": "Mme.deR", "target": "Valjean", "value": 1},
	{"source": "Isabeau", "target": "Valjean", "value": 1},
	{"source": "Gervais", "target": "Valjean", "value": 1},
	{"source": "Listolier", "target": "Tholomyes", "value": 4},
	{"source": "Fameuil", "target": "Tholomyes", "value": 4},
	{"source": "Fameuil", "target": "Listolier", "value": 4},
	{"source": "Blacheville", "target": "Tholomyes", "value": 4},
	{"source": "Blacheville", "target": "Listolier", "value": 4},
	{"source": "Blacheville", "target": "Fameuil", "value": 4},
	{"source": "Favourite", "target": "Tholomyes", "value": 3},
	{"source": "Favourite", "target": "Listolier", "value": 3},
	{"source": "Favourite", "target": "Fameuil", "value": 3},
	{"source": "Favourite", "target": "Blacheville", "value": 4},
	{"source": "Dahlia", "target": "Tholomyes", "value": 3},
	{"source": "Dahlia", "target": "Listolier", "value": 3},
	{"source": "Dahlia", "target": "Fameuil", "value": 3},
	{"source": "Dahlia", "target": "Blacheville", "value": 3},
	{"source": "Dahlia", "target": "Favourite", "value": 5},
	{"source": "Zephine", "target": "Tholomyes", "value": 3},
	{"source": "Zephine", "target": "Listolier", "value": 3},
	{"source": "Zephine", "target": "Fameuil", "value": 3},
	{"source": "Zephine", "target": "Blacheville", "value": 3},
	{"source": "Zephine", "target": "Favourite", "value": 4},
	{"source": "Zephine", "target": "Dahlia", "value": 4},
	{"source": "Fantine", "target": "Tholomyes", "value": 3},
	{"source": "Fantine", "target": "Listolier", "value": 3},
	{"source": "Fantine", "target": "Fameuil", "value": 3},
	{"source": "Fantine", "target": "Blacheville", "value": 3},
	{"source": "Fantine", "target": "Favourite", "value": 4},
	{"source": "Fantine", "target": "Dahlia", "value": 4},
	{"source": "Fantine", "target": "Zephine", "value": 4},
	{"source": "Fantine", "target": "Marguerite", "value": 2},
	{"source": "Fantine", "target": "Valjean", "value": 9},
	{"source": "Mme.Thenardier", "target": "Fantine", "value": 2},
	{"source": "Mme.Thenardier", "target": "Valjean", "value": 7},
	{"source": "Thenardier", "target": "Mme.Thenardier", "value": 13},
	{"source": "Thenardier", "target": "Fantine", "value": 1},
	{"source": "Thenardier", "target": "Valjean", "value": 12},
	{"source": "Cosette", "target": "Mme.Thenardier", "value": 4},
	{"source": "Cosette", "target": "Valjean", "value": 31},
	{"source": "Cosette", "target": "Tholomyes", "value": 1},
	{"source": "Cosette", "target": "Thenardier", "value": 1},
	{"source": "Javert", "target": "Valjean", "value": 17},
	{"source": "Javert", "target": "Fantine", "value": 5},
	{"source": "Javert", "target": "Thenardier", "value": 5},
	{"source": "Javert", "target": "Mme.Thenardier", "value": 1},
	{"source": "Javert", "target": "Cosette", "value": 1},
	{"source": "Fauchelevent", "target": "Valjean", "value": 8},
	{"source": "Fauchelevent", "target": "Javert", "value": 1},
	{"source": "Bamatabois", "target": "Fantine", "value": 1},
	{"source": "Bamatabois", "target": "Javert", "value": 1},
	{"source": "Bamatabois", "target": "Valjean", "value": 2},
	{"source": "Perpetue", "target": "Fantine", "value": 1},
	{"source": "Simplice", "target": "Perpetue", "value": 2},
	{"source": "Simplice", "target": "Valjean", "value": 3},
	{"source": "Simplice", "target": "Fantine", "value": 2},
	{"source": "Simplice", "target": "Javert", "value": 1},
	{"source": "Scaufflaire", "target": "Valjean", "value": 1},
	{"source": "Woman1", "target": "Valjean", "value": 2},
	{"source": "Woman1", "target": "Javert", "value": 1},
	{"source": "Judge", "target": "Valjean", "value": 3},
	{"source": "Judge", "target": "Bamatabois", "value": 2},
	{"source": "Champmathieu", "target": "Valjean", "value": 3},
	{"source": "Champmathieu", "target": "Judge", "value": 3},
	{"source": "Champmathieu", "target": "Bamatabois", "value": 2},
	{"source": "Brevet", "target": "Judge", "value": 2},
	{"source": "Brevet", "target": "Champmathieu", "value": 2},
	{"source": "Brevet", "target": "Valjean", "value": 2},
	{"source": "Brevet", "target": "Bamatabois", "value": 1},
	{"source": "Chenildieu", "target": "Judge", "value": 2},
	{"source": "Chenildieu", "target": "Champmathieu", "value": 2},
	{"source": "Chenildieu", "target": "Brevet", "value": 2},
	{"source": "Chenildieu", "target": "Valjean", "value": 2},
	{"source": "Chenildieu", "target": "Bamatabois", "value": 1},
	{"source": "Cochepaille", "target": "Judge", "value": 2},
	{"source": "Cochepaille", "target": "Champmathieu", "value": 2},
	{"source": "Cochepaille", "target": "Brevet", "value": 2},
	{"source": "Cochepaille", "target": "Chenildieu", "value": 2},
	{"source": "Cochepaille", "target": "Valjean", "value": 2},
	{"source": "Cochepaille", "target": "Bamatabois", "value": 1},
	{"source": "Pontmercy", "target": "Thenardier", "value": 1},
	{"source": "Boulatruelle", "target": "Thenardier", "value": 1},
	{"source": "Eponine", "target": "Mme.Thenardier", "value": 2},
	{"source": "Eponine", "target": "Thenardier", "value": 3},
	{"source": "Anzelma", "target": "Eponine", "value": 2},
	{"source": "Anzelma", "target": "Thenardier", "value": 2},
	{"source": "Anzelma", "target": "Mme.Thenardier", "value": 1},
	{"source": "Woman2", "target": "Valjean", "value": 3},
	{"source": "Woman2", "target": "Cosette", "value": 1},
	{"source": "Woman2", "target": "Javert", "value": 1},
	{"source": "MotherInnocent", "target": "Fauchelevent", "value": 3},
	{"source": "MotherInnocent", "target": "Valjean", "value": 1},
	{"source": "Gribier", "target": "Fauchelevent", "value": 2},
	{"source": "Mme.Burgon", "target": "Jondrette", "value": 1},
	{"source": "Gavroche", "target": "Mme.Burgon", "value": 2},
	{"source": "Gavroche", "target": "Thenardier", "value": 1},
	{"source": "Gavroche", "target": "Javert", "value": 1},
	{"source": "Gavroche", "target": "Valjean", "value": 1},
	{"source": "Gillenormand", "target": "Cosette", "value": 3},
	{"source": "Gillenormand", "target": "Valjean", "value": 2},
	{"source": "Magnon", "target": "Gillenormand", "value": 1},
	{"source": "Magnon", "target": "Mme.Thenardier", "value": 1},
	{"source": "Mlle.Gillenormand", "target": "Gillenormand", "value": 9},
	{"source": "Mlle.Gillenormand", "target": "Cosette", "value": 2},
	{"source": "Mlle.Gillenormand", "target": "Valjean", "value": 2},
	{"source": "Mme.Pontmercy", "target": "Mlle.Gillenormand", "value": 1},
	{"source": "Mme.Pontmercy", "target": "Pontmercy", "value": 1},
	{"source": "Mlle.Vaubois", "target": "Mlle.Gillenormand", "value": 1},
	{"source": "Lt.Gillenormand", "target": "Mlle.Gillenormand", "value": 2},
	{"source": "Lt.Gillenormand", "target": "Gillenormand", "value": 1},
	{"source": "Lt.Gillenormand", "target": "Cosette", "value": 1},
	{"source": "Marius", "target": "Mlle.Gillenormand", "value": 6},
	{"source": "Marius", "target": "Gillenormand", "value": 12},
	{"source": "Marius", "target": "Pontmercy", "value": 1},
	{"source": "Marius", "target": "Lt.Gillenormand", "value": 1},
	{"source": "Marius", "target": "Cosette", "value": 21},
	{"source": "Marius", "target": "Valjean", "value": 19},
	{"source": "Marius", "target": "Tholomyes", "value": 1},
	{"source": "Marius", "target": "Thenardier", "value": 2},
	{"source": "Marius", "target": "Eponine", "value": 5},
	{"source": "Marius", "target": "Gavroche", "value": 4},
	{"source": "BaronessT", "target": "Gillenormand", "value": 1},
	{"source": "BaronessT", "target": "Marius", "value": 1},
	{"source": "Mabeuf", "target": "Marius", "value": 1},
	{"source": "Mabeuf", "target": "Eponine", "value": 1},
	{"source": "Mabeuf", "target": "Gavroche", "value": 1},
	{"source": "Enjolras", "target": "Marius", "value": 7},
	{"source": "Enjolras", "target": "Gavroche", "value": 7},
	{"source": "Enjolras", "target": "Javert", "value": 6},
	{"source": "Enjolras", "target": "Mabeuf", "value": 1},
	{"source": "Enjolras", "target": "Valjean", "value": 4},
	{"source": "Combeferre", "target": "Enjolras", "value": 15},
	{"source": "Combeferre", "target": "Marius", "value": 5},
	{"source": "Combeferre", "target": "Gavroche", "value": 6},
	{"source": "Combeferre", "target": "Mabeuf", "value": 2},
	{"source": "Prouvaire", "target": "Gavroche", "value": 1},
	{"source": "Prouvaire", "target": "Enjolras", "value": 4},
	{"source": "Prouvaire", "target": "Combeferre", "value": 2},
	{"source": "Feuilly", "target": "Gavroche", "value": 2},
	{"source": "Feuilly", "target": "Enjolras", "value": 6},
	{"source": "Feuilly", "target": "Prouvaire", "value": 2},
	{"source": "Feuilly", "target": "Combeferre", "value": 5},
	{"source": "Feuilly", "target": "Mabeuf", "value": 1},
	{"source": "Feuilly", "target": "Marius", "value": 1},
	{"source": "Courfeyrac", "target": "Marius", "value": 9},
	{"source": "Courfeyrac", "target": "Enjolras", "value": 17},
	{"source": "Courfeyrac", "target": "Combeferre", "value": 13},
	{"source": "Courfeyrac", "target": "Gavroche", "value": 7},
	{"source": "Courfeyrac", "target": "Mabeuf", "value": 2},
	{"source": "Courfeyrac", "target": "Eponine", "value": 1},
	{"source": "Courfeyrac", "target": "Feuilly", "value": 6},
	{"source": "Courfeyrac", "target": "Prouvaire", "value": 3},
	{"source": "Bahorel", "target": "Combeferre", "value": 5},
	{"source": "Bahorel", "target": "Gavroche", "value": 5},
	{"source": "Bahorel", "target": "Courfeyrac", "value": 6},
	{"source": "Bahorel", "target": "Mabeuf", "value": 2},
	{"source": "Bahorel", "target": "Enjolras", "value": 4},
	{"source": "Bahorel", "target": "Feuilly", "value": 3},
	{"source": "Bahorel", "target": "Prouvaire", "value": 2},
	{"source": "Bahorel", "target": "Marius", "value": 1},
	{"source": "Bossuet", "target": "Marius", "value": 5},
	{"source": "Bossuet", "target": "Courfeyrac", "value": 12},
	{"source": "Bossuet", "target": "Gavroche", "value": 5},
	{"source": "Bossuet", "target": "Bahorel", "value": 4},
	{"source": "Bossuet", "target": "Enjolras", "value": 10},
	{"source": "Bossuet", "target": "Feuilly", "value": 6},
	{"source": "Bossuet", "target": "Prouvaire", "value": 2},
	{"source": "Bossuet", "target": "Combeferre", "value": 9},
	{"source": "Bossuet", "target": "Mabeuf", "value": 1},
	{"source": "Bossuet", "target": "Valjean", "value": 1},
	{"source": "Joly", "target": "Bahorel", "value": 5},
	{"source": "Joly", "target": "Bossuet", "value": 7},
	{"source": "Joly", "target": "Gavroche", "value": 3},
	{"source": "Joly", "target": "Courfeyrac", "value": 5},
	{"source": "Joly", "target": "Enjolras", "value": 5},
	{"source": "Joly", "target": "Feuilly", "value": 5},
	{"source": "Joly", "target": "Prouvaire", "value": 2},
	{"source": "Joly", "target": "Combeferre", "value": 5},
	{"source": "Joly", "target": "Mabeuf", "value": 1},
	{"source": "Joly", "target": "Marius", "value": 2},
	{"source": "Grantaire", "target": "Bossuet", "value": 3},
	{"source": "Grantaire", "target": "Enjolras", "value": 3},
	{"source": "Grantaire", "target": "Combeferre", "value": 1},
	{"source": "Grantaire", "target": "Courfeyrac", "value": 2},
	{"source": "Grantaire", "target": "Joly", "value": 2},
	{"source": "Grantaire", "target": "Gavroche", "value": 1},
	{"source": "Grantaire", "target": "Bahorel", "value": 1},
	{"source": "Grantaire", "target": "Feuilly", "value": 1},
	{"source": "Grantaire", "target": "Prouvaire", "value": 1},
	{"source": "MotherPlutarch", "target": "Mabeuf", "value": 3},
	{"source": "Gueulemer", "target": "Thenardier", "value": 5},
	{"source": "Gueulemer", "target": "Valjean", "value": 1},
	{"source": "Gueulemer", "target": "Mme.Thenardier", "value": 1},
	{"source": "Gueulemer", "target": "Javert", "value": 1},
	{"source": "Gueulemer", "target": "Gavroche", "value": 1},
	{"source": "Gueulemer", "target": "Eponine", "value": 1},
	{"source": "Babet", "target": "Thenardier", "value": 6},
	{"source": "Babet", "target": "Gueulemer", "value": 6},
	{"source": "Babet", "target": "Valjean", "value": 1},
	{"source": "Babet", "target": "Mme.Thenardier", "value": 1},
	{"source": "Babet", "target": "Javert", "value": 2},
	{"source": "Babet", "target": "Gavroche", "value": 1},
	{"source": "Babet", "target": "Eponine", "value": 1},
	{"source": "Claquesous", "target": "Thenardier", "value": 4},
	{"source": "Claquesous", "target": "Babet", "value": 4},
	{"source": "Claquesous", "target": "Gueulemer", "value": 4},
	{"source": "Claquesous", "target": "Valjean", "value": 1},
	{"source": "Claquesous", "target": "Mme.Thenardier", "value": 1},
	{"source": "Claquesous", "target": "Javert", "value": 1},
	{"source": "Claquesous", "target": "Eponine", "value": 1},
	{"source": "Claquesous", "target": "Enjolras", "value": 1},
	{"source": "Montparnasse", "target": "Javert", "value": 1},
	{"source": "Montparnasse", "target": "Babet", "value": 2},
	{"source": "Montparnasse", "target": "Gueulemer", "value": 2},
	{"source": "Montparnasse", "target": "Claquesous", "value": 2},
	{"source": "Montparnasse", "target": "Valjean", "value": 1},
	{"source": "Montparnasse", "target": "Gavroche", "value": 1},
	{"source": "Montparnasse", "target": "Eponine", "value": 1},
	{"source": "Montparnasse", "target": "Thenardier", "value": 1},
	{"source": "Toussaint", "target": "Cosette", "value": 2},
	{"source": "Toussaint", "target": "Javert", "value": 1},
	{"source": "Toussaint", "target": "Valjean", "value": 1},
	{"source": "Child1", "target": "Gavroche", "value": 2},
	{"source": "Child2", "target": "Gavroche", "value": 2},
	{"source": "Child2", "target": "Child1", "value": 3},
	{"source": "Brujon", "target": "Babet", "value": 3},
	{"source": "Brujon", "target": "Gueulemer", "value": 3},
	{"source": "Brujon", "target": "Thenardier", "value": 3},
	{"source": "Brujon", "target": "Gavroche", "value": 1},
	{"source": "Brujon", "target": "Eponine", "value": 1},
	{"source": "Brujon", "target": "Claquesous", "value": 1},
	{"source": "Brujon", "target": "Montparnasse", "value": 1},
	{"source": "Mme.Hucheloup", "target": "Bossuet", "value": 1},
	{"source": "Mme.Hucheloup", "target": "Joly", "value": 1},
	{"source": "Mme.Hucheloup", "target": "Grantaire", "value": 1},
	{"source": "Mme.Hucheloup", "target": "Bahorel", "value": 1},
	{"source": "Mme.Hucheloup", "target": "Courfeyrac", "value": 1},
	{"source": "Mme.Hucheloup", "target": "Gavroche", "value": 1},
	{"source": "Mme.Hucheloup", "target": "Enjolras", "value": 1}
	]
	}

	var nodelinkSvg = d3.select("#nodelink"),
	width = +nodelinkSvg.attr("width"),
	height = +nodelinkSvg.attr("height");

	var color = d3.scaleOrdinal(d3.schemeCategory20);

	var simulation = d3.forceSimulation()
	.force("link", d3.forceLink().id(function(d) { return d.id; }))
	.force("charge", d3.forceManyBody())
	.force("center", d3.forceCenter(width / 2, height / 2));

	dispatch.on("dataLoaded.nodelink", function(graph)
	{
	var link = nodelinkSvg.append("g")
	.attr("class", "links")
	.selectAll("line")
	.data(graph.links)
	.enter().append("line")
	.attr("stroke-width", function(d) { return Math.sqrt(d.value); });

	var node = nodelinkSvg.append("g")
	.attr("class", "nodes")
	.selectAll("circle")
	.data(graph.nodes)
	.enter().append("circle")
	.attr("r", 5)
	.attr("fill", function(d) { return color(d.group); })
	.call(d3.drag()
	.on("start", dragstarted)
	.on("drag", dragged)
	.on("end", dragended));

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

	simulation
	.nodes(graph.nodes)
	.on("tick", ticked);

	simulation.force("link")
	.links(graph.links);

	function ticked() {
	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; });
	}
	});

	function dragstarted(d) {
	if (!d3.event.active) simulation.alphaTarget(0.3).restart();
	d.fx = d.x;
	d.fy = d.y;
	}

	function dragged(d) {
	d.fx = d3.event.x;
	d.fy = d3.event.y;
	}

	function dragended(d) {
	if (!d3.event.active) simulation.alphaTarget(0);
	d.fx = null;
	d.fy = null;
	}
	var svg = d3.select("#piechart"),
	width = +svg.attr("width"),
	height = +svg.attr("height"),
	radius = Math.min(width, height) / 2,
	g = svg.append("g").attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

	var color = d3.scaleOrdinal(d3.schemeCategory20);

	var pie = d3.pie()
	.sort(null)
	.value(function(d) { return d.count; });

	var path = d3.arc()
	.outerRadius(radius - 10)
	.innerRadius(0);

	var label = d3.arc()
	.outerRadius(radius - 40)
	.innerRadius(radius - 40);

	dispatch.on("dataLoaded.pie", function(data) {

	var groupsDataObject = {};
	for(var i = 0; i < data.nodes.length; i++)
	{
	var character = data.nodes[i];
	if(!groupsDataObject[character.group])
	groupsDataObject[character.group] = [];
	groupsDataObject[character.group].push(character);
	}
	var groupsData = [];
	for(var groupId in groupsDataObject)
	{
	groupsData.push({groupId: parseInt(groupId), count: groupsDataObject[groupId].length});
	}

	var arc = g.selectAll(".arc")
	.data(pie(groupsData))
	.enter().append("g")
	.attr("class", "arc");

	arc.append("path")
	.attr("d", path)
	.attr("fill", function(d) { return color(d.data.groupId); });

	arc.append("text")
	.attr("transform", function(d) { return "translate(" + label.centroid(d) + ")"; })
	.attr("dy", "0.35em")
	.text(function(d) { return d.data.age; });
	});