Draggable Network

.block

license: gpl-3.0

README.md

This example demonstrates a simple method of hand-tweaking a force-directed layout. Using d3.behavior.drag, the nodes in this network are made draggable; dragging updates the x and y properties of each node. The resulting graph could then be saved back to a JSON file using JSON.stringify.

graph.json

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index.html

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

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

.link {
  stroke: #999;
}

</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var width = 960,
    height = 500;

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

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

  graph.links.forEach(function(d) {
    d.source = graph.nodes[d.source];
    d.target = graph.nodes[d.target];
  });

  var link = svg.append("g")
      .attr("class", "link")
    .selectAll("line")
    .data(graph.links)
    .enter().append("line")
      .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; });

  var node = svg.append("g")
      .attr("class", "node")
    .selectAll("circle")
    .data(graph.nodes)
    .enter().append("circle")
      .attr("r", 4)
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; })
      .call(d3.drag().on("drag", dragged));

  function dragged(d) {
    d.x = d3.event.x, d.y = d3.event.y;
    d3.select(this).attr("cx", d.x).attr("cy", d.y);
    link.filter(function(l) { return l.source === d; }).attr("x1", d.x).attr("y1", d.y);
    link.filter(function(l) { return l.target === d; }).attr("x2", d.x).attr("y2", d.y);
  }
});

</script>

thumbnail.png