D3 Examples - Square Force

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.node {
  stroke: #fff;
  stroke-width: 1.5px;
}
​
.link {
  stroke: black;
  stroke-opacity: 0.5;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
​
<script>
​
var width = 960,
    height = 800;
​
var color = d3.scale.category20();
​
var force = d3.layout.force()
    .charge(-4000)
    .linkDistance(350)
    .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("rect")
      .attr("class", "node")
      .attr("width", function(d) {return d.size*75;})
      .attr("height", function(d) {return d.size*55;})
      .style("stroke","green")
      .style("stroke-width", function(d) {return d.size*5;})
      .style("fill", function(d) { return "black"; })
      .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","white")
   .style("font-family","helvetica")
   .style("font-size",function(d) {return d.size*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("x", function(d) { return d.x-(d.size*10); })
        .attr("y", function(d) { return d.y-(d.size*10); });
        
        
    text.attr("x", function(d) { return d.x; })
        .attr("y", function(d) { return d.y+(d.size*10); });
        
  });
});
​
</script>
    