Zoomable forcegraph

Compare this display to a force layout with curved links, a force layout with fisheye distortion and a matrix diagram.

forked from BTKY's block: Weighted nodes and curved links v4

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

.links line {
  stroke: #999;
  stroke-opacity: 0.6;
}

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

</style>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

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

function zoomed() {
  svg.attr("transform", d3.event.transform);
}

var color = d3.scaleOrdinal(d3.schemeCategory20);
  
var radius = d3.scaleSqrt()
    .range([0, 6]);

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

var link = svg.append("g")
      .attr("class", "links")
    .selectAll("path")
    .data(graph.links)
    .enter().append("svg:path")
      .attr("stroke-width", function(d) { return 1 });

link.style('fill', 'none')
  		.style('stroke', 'black')
      .style("stroke-width", '2px');

simulation
      .nodes(graph.nodes)
      .on("tick", ticked);

simulation.force("link")
      .links(graph.links);

function ticked() {
    link.attr("d", function(d) {
        var dx = d.target.x - d.source.x,
            dy = d.target.y - d.source.y,
            dr = Math.sqrt(dx * dx + dy * dy);
        return "M" + 
            d.source.x + "," + 
            d.source.y + "A" + 
            dr + "," + dr + " 0 0,1 " + 
            d.target.x + "," + 
            d.target.y;
    });

/*node.selectAll('circle')
        .attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });*/
    
    node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
    
    
    svg.append('rect').attr('width', width).attr('height', height).attr('fill', 'red').style('fill-opacity', '.2').call(d3.zoom()
        .scaleExtent([1 / 2, 4])
         
        .on("zoom", zoomed));
  }
});

function dragstarted(d) {
  if (!d3.event.active) simulation.alphaTarget(0.3).restart();
  d.fx = d.x;
  d.fy = d.y;
}

function dragged(d) {
  d.fx = d3.event.x;
  d.fy = d3.event.y;
}

function dragended(d) {
  if (!d3.event.active) simulation.alphaTarget(0);
  d.fx = null;
  d.fy = null;
}

</script>

https://d3js.org/d3.v4.min.js