Web Science Assignment 6 -Question 1

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

.link {
  stroke: #ccc;
}

.node text {
  pointer-events: none;
  font: 15px sans-serif;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 1050,
    height = 960

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
	
	svg.append("defs").selectAll("marker")
    .data(["suit", "licensing", "resolved"])
  .enter().append("marker")
    .attr("id", function(d) { return d; })
    .attr("viewBox", "0 -5 10 10")
    .attr("refX", 25)
    .attr("refY", 0)
    .attr("markerWidth", 6)
    .attr("markerHeight", 6)
    .attr("orient", "auto")
  .append("path")
    .attr("d", "M0,-5L10,0L0,5 L10,0 L0, -5")
    .style("stroke", "#4679BD")
    .style("opacity", "0.6");

var force = d3.layout.force()
    .gravity(0.05)
    .distance(300)
    .charge(-100)
    .size([width, height]);

d3.json("follower.json", function(error, json) {
  if (error) throw error;

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

var link = svg.selectAll(".link")
      .data(json.links)
    .enter().append("line")
      .attr("class", "link")
      .style("marker-end",  "url(#suit)"); // Modified line 
  var node = svg.selectAll(".node")
      .data(json.nodes)
    .enter().append("g")
      .attr("class", "node")
      .call(force.drag);

node.append("image")
      .attr("xlink:href", "https://github.com/favicon.ico")
      .attr("x", -8)
      .attr("y", -8)
      .attr("width", 16)
      .attr("height", 16);

node.append("text")
      .attr("dx", 12)
      .attr("dy", ".35em")
      .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("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
  });
});

</script>

https://d3js.org/d3.v3.min.js