Force layout Demo

forked from ohdebby's block: Force layout

forked from lorenzopub's block: Force layout

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
var margin = {top:20, bottom:20, left:20, right:20};
var width = 600 - margin.left - margin.right;
var height = 400 - margin.top - margin.bottom;
var radius = 8;
var colors = d3.scaleOrdinal(d3.schemeCategory10);  
    
var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)

d3.json('miserables.json', function(err,data){
  data.nodes.forEach(function(node){
    var perRow = 4
    node.focusX = (node.group % perRow) * 40;
    node.focusY = Math.floor(node.group/perRow)*40;
  });
//   console.log(data.links)
  var drag = d3.drag()
  		.on('start', function(){
        if (!d3.event.active){
          simulation.alphaTarget(0.35).restart();
        }
      })
  		.on('end', function(){
        simulation.alphaTarget(0);
        d3.event.subject.fx=null;
 	  		d3.event.subject.fy=null;
      })
  		
  		.on('drag', function(){
//       console.log(d3.event);
      d3.event.subject.fx = d3.event.x;
      d3.event.subject.fy = d3.event.y;
    });
  
  var simulation = d3.forceSimulation(data.nodes)
 		.force('center', d3.forceCenter(width/2, height/2))	
		.force('collide', d3.forceCollide(radius+15))
  	.force('attraction', d3.forceManyBody().strength(30).distanceMin(200))
  		.force('repulsion', d3.forceManyBody().strength(-30).distanceMax(200))
 	.force('x', d3.forceX().x(function(d){
    return d.focusX
  }))
   	.force('y', d3.forceY().y(function(d){
    return d.focusY
  }))
  .force('links', d3.forceLink(data.links).id(function(d){return d.id}))
  .on('tick', ticked);

var links = svg.selectAll("line")
 		.data(data.links)
 		.enter().append('line')
 		.attr('stroke','#ccc');
 var circles = svg.selectAll("circle")
  	.data(data.nodes, function(d){return d.id})
  	.enter().append("circle")
  	.attr("r", radius)
 		.attr('fill', function(d){return colors(d.group)})
 		.call(drag);

function ticked(){
    circles.attr('cx', function(d) {return d.x})
    		.attr('cy', function (d) {return d.y})
    links.attr('x1', function(d){return d.source.x})
    		.attr('x2', function(d) {return d.target.x})
    		.attr('y1', function(d) {return d.source.y})
    		.attr('y2', function(d) {return d.target.y})    
  }
});

</script>
</body>

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