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var miserables = {
  "nodes":[
    {"name":"Myriel","group":1},
    {"name":"Napoleon","group":2},
    {"name":"Mlle.Baptistine","group":3},
    {"name":"Mlle.Baptistine","group":3},
    {"name":"Mlle.Baptistine","group":3}
     
  ],
  "links":[
    {"source":1,"target":0,"value":10},
    {"source":2,"target":1,"value":20},
    {"source":2,"target":0,"value":20},
    {"source":3,"target":0,"value":20},
    {"source":3,"target":4,"value":20}
  ]
}

var width = 960,
    height = 500;

var color = d3.scale.category20();

var force = d3.layout.force()
    .charge(-600)
    .linkDistance(300)
    .size([width, height]);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);


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

  var link = svg.selectAll(".link")
      .data(miserables.links)
    .enter().append("line")
      .attr("class", "link")
      .style("stroke-width", function(d) { return Math.sqrt(d.value); });
 
  var node = svg.selectAll(".node")
      .data(miserables.nodes)
    .enter().append("circle")
      .attr({
        "r": 50,
        "class":"node"
      })
      .style("fill", function(d) { return color(d.group); })
      .call(force.drag); 

  node.append("text") 
      .text(function(d) { return d.name; });
 
/*  svg.append("text").text("text").attr({
    x:500,
    y:200
  });*/
 
  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; }); 
  });
/*
d3.json(miserables, function(error, graph) {
  console.log(graph);
   
  force.nodes(graph.nodes)
      .links(graph.links)
      .start();

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

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

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

  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; });
  });
});
*/

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

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