collision mobile

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 500,
    height = 500;
  
var textos = ["El Corral", "Carulla","Exito","Gratto","Zara","Cascabel","Alkosto","Falabella","Sodexo"];

var counts = //d3.range(10).map(function() { return {radius: Math.random() * 50 + 30}});
[,23,84,85,16,47,34,124,103,41,90];

root.radius = 0;
root.fixed = true;

var force = d3.layout.force()
    .gravity(0.05)
    .charge(function(d, i) { return i ? 0 : -2000; })
    .nodes(nodes)
    .size([width, height]);

force.start();

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

//le toca hacer un grupo enter circle y text, no una jerarquia  
var bub = svg.selectAll("circle")
    .data(nodes.slice(1)) 
  .enter().append("circle")
    .attr("r", function(d) { return d.radius; })
    .style("fill", function(d, i) { return color(i ); });

svg.selectAll("text")
   .data(nodes.slice(1)) //nodes
  	.enter().append("text")  
    //.attr("x", function(d) { return 5*d.radius; })
    //.attr("y", function(d) { return 9*d.radius;})
  	.attr("font-size", function(d) { return 0.2*d.radius+"px";}) //"25px" ) 
	  .attr("dx", function(d){return "-"+0.3*d.radius+"px"})
		.attr("dy", function(d){return 0.05*d.radius+"px"})
  	.attr("fill", "white")
		//.text("hola");
    .text(function(d,i) { return textos[i];}); //"hola!!");  
  
force.on("tick", function(e) {
  var q = d3.geom.quadtree(nodes),
      i = 0,
      n = nodes.length;

while (++i < n) q.visit(collide(nodes[i]));

svg.selectAll("circle")
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
  
  svg.selectAll("text") 
    .attr("x", function(d) { return d.x; })
    .attr("y", function(d) { return d.y;});
    
  
  ;
});

svg.on("mouseover", function() 
//svg.on("touchmove", function() 
         {
  var p1 = d3.mouse(this);
  root.px = p1[0];
  root.py = p1[1];
  force.resume();
});
//})

</script>

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