D3 Examples - Custom Shapes in Force Diagram

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
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​
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.link {
  stroke: black;
  stroke-opacity: 0.5;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
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<script>
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var width = 1960,
    height = 1800;
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var color = d3.scale.category20();
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var force = d3.layout.force()
    .charge(-4000)
    .linkDistance(450)
    .size([width, height]);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
d3.json("raw.json", function(error, 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 10; });
​
  var circle = svg.append("g").selectAll(".node")
      .data(graph.nodes)
    .enter().append("path").attr("d",function(d) {return d.shape;})
    .style("stroke","black")
.style("stroke-width",3)
.style("fill","black")
      .attr("class", "node")
      //.attr("transform", function(d) { return "translate("+d.y + "," +d.x + ")" ;})
      .call(force.drag);
     
      
   /*var text = svg.append("g").selectAll(".text")
   .data(graph.nodes)
   .enter()
   .append("text")
   .attr("x",0)
   .attr("y",".31em")
   .text(function(d) {return d.name;})
   .style("fill","black")
   .style("font-family","helvetica")
   .style("font-size",function(d) {return 15;})*/
​
​
  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; });
​
    circle.attr("transform", function(d) { return "translate("+(d.x -d.offx)+ "," +(d.y-d.offy) + ")" ;});
        
        
    /*text.attr("x", function(d) { return d.x; })
        .attr("y", function(d) { return d.y+(d.size*10); });*/
        
​
        
  });
});
​
​
​
​
</script>
    