Force-Directed Graph with Drag/Zoom/Pan/Center/Resize/Labels/Shapes/Filter/Highlight

Force directed Graph with:

Dragable nodes
Zoom and pan (with maximum effective-size limit for zoomed elements)
Double-click to center node
Resizable window (with zoom/pan-aware relocation of center of gravity)
Text labels (which are not occluded by nodes; flag to set centered/offset)
Properties determine node size and shape, and node and link colors (with default values; flag to set fill/outline).
Filter nodes by shape (c,d,r,s,t,x), by score (l,h,m), if orphan (0), and filter links by score (1,2,3)
Hover to highlight 1st-order neighborhood. Click to fade surroundings
Read graph from json file

forked from cool-Blue's block: Force-Directed Graph with Drag/Zoom/Pan/Center/Resize/Labels/Shapes/Filter/Highlight

<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  overflow:hidden;
   margin:0;
}

text {
  font-family: sans-serif;
  pointer-events: none;
}

</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
var w = window.innerWidth;
var h = window.innerHeight;

var keyc = true, keys = true, keyt = true, keyr = true, keyx = true, keyd = true, keyl = true, keym = true, keyh = true, key1 = true, key2 = true, key3 = true, key0 = true

var focus_node = null, highlight_node = null;

var text_center = false;
var outline = false;

var min_score = 0;
var max_score = 1;

var color = d3.scale.linear()
  .domain([min_score, (min_score+max_score)/2, max_score])
  .range(["lime", "yellow", "red"]);

var highlight_color = "blue";
var highlight_trans = 0.1;
  
var size = d3.scale.pow().exponent(1)
  .domain([1,100])
  .range([8,24]);
	
var force = d3.layout.force()
  .linkDistance(60)
  .charge(-300)
  .size([w,h]);

var default_node_color = "#ccc";
//var default_node_color = "rgb(3,190,100)";
var default_link_color = "#888";
var nominal_base_node_size = 8;
var nominal_text_size = 10;
var max_text_size = 24;
var nominal_stroke = 1.5;
var max_stroke = 4.5;
var max_base_node_size = 36;
var min_zoom = 0.1;
var max_zoom = 7;
var svg = d3.select("body").append("svg");
var zoom = d3.behavior.zoom().scaleExtent([min_zoom,max_zoom])
var g = svg.append("g");
svg.style("cursor","move");

d3.json("graph.json", function(error, graph) {

var linkedByIndex = {};
    graph.links.forEach(function(d) {
	linkedByIndex[d.source + "," + d.target] = true;
    });

function isConnected(a, b) {
        return linkedByIndex[a.index + "," + b.index] || linkedByIndex[b.index + "," + a.index] || a.index == b.index;
    }

function hasConnections(a) {
		for (var property in linkedByIndex) {
				s = property.split(",");
				if ((s[0] == a.index || s[1] == a.index) && linkedByIndex[property]) 					return true;
		}
	return false;
	}
	
  force
    .nodes(graph.nodes)
    .links(graph.links)
    .start();

var link = g.selectAll(".link")
    .data(graph.links)
    .enter().append("line")
    .attr("class", "link")
	.style("stroke-width",nominal_stroke)
	.style("stroke", function(d) { 
	if (isNumber(d.score) && d.score>=0) return color(d.score);
	else return default_link_color; })

var node = g.selectAll(".node")
    .data(graph.nodes)
    .enter().append("g")
    .attr("class", "node")
	
    .call(force.drag)

node.on("dblclick.zoom", function(d) { d3.event.stopPropagation();
	var dcx = (window.innerWidth/2-d.x*zoom.scale());
	var dcy = (window.innerHeight/2-d.y*zoom.scale());
	zoom.translate([dcx,dcy]);
	 g.attr("transform", "translate("+ dcx + "," + dcy  + ")scale(" + zoom.scale() + ")");
	 
	 
	});

if (text_center)
	 text.text(function(d) { return d.id; })
	.style("text-anchor", "middle");
	else 
	text.attr("dx", function(d) {return (size(d.size)||nominal_base_node_size);})
    .text(function(d) { return '\u2002'+d.id; });

node.on("mouseover", function(d) {
	set_highlight(d);
	})
  .on("mousedown", function(d) { d3.event.stopPropagation();
  	focus_node = d;
	set_focus(d)
	if (highlight_node === null) set_highlight(d)
	
}	).on("mouseout", function(d) {
		exit_highlight();

}	);

d3.select(window).on("mouseup",  
		function() {
		if (focus_node!==null)
		{
			focus_node = null;
			if (highlight_trans<1)
			{
	
		circle.style("opacity", 1);
	  text.style("opacity", 1);
	  link.style("opacity", 1);
	}
		}
	
	if (highlight_node === null) exit_highlight();
		});

function set_focus(d)
{	
if (highlight_trans<1)  {
    circle.style("opacity", function(o) {
                return isConnected(d, o) ? 1 : highlight_trans;
            });

text.style("opacity", function(o) {
                return isConnected(d, o) ? 1 : highlight_trans;
            });
			
            link.style("opacity", function(o) {
                return o.source.index == d.index || o.target.index == d.index ? 1 : highlight_trans;
            });		
	}
}

function set_highlight(d)
{
	svg.style("cursor","pointer");
	if (focus_node!==null) d = focus_node;
	highlight_node = d;

if (highlight_color!="white")
	{
		  circle.style(towhite, function(o) {
                return isConnected(d, o) ? highlight_color : "white";});
			text.style("font-weight", function(o) {
                return isConnected(d, o) ? "bold" : "normal";});
            link.style("stroke", function(o) {
		      return o.source.index == d.index || o.target.index == d.index ? highlight_color : ((isNumber(o.score) && o.score>=0)?color(o.score):default_link_color);

});
	}
}
 	
 	
  zoom.on("zoom", function() {
  
    var stroke = nominal_stroke;
    if (nominal_stroke*zoom.scale()>max_stroke) stroke = max_stroke/zoom.scale();
    link.style("stroke-width",stroke);
    circle.style("stroke-width",stroke);
	   
	var base_radius = nominal_base_node_size;
    if (nominal_base_node_size*zoom.scale()>max_base_node_size) base_radius = max_base_node_size/zoom.scale();
        circle.attr("d", d3.svg.symbol()
        .size(function(d) { return Math.PI*Math.pow(size(d.size)*base_radius/nominal_base_node_size||base_radius,2); })
        .type(function(d) { return d.type; }))
		
	//circle.attr("r", function(d) { return (size(d.size)*base_radius/nominal_base_node_size||base_radius); })
	if (!text_center) text.attr("dx", function(d) { return (size(d.size)*base_radius/nominal_base_node_size||base_radius); });
	
	var text_size = nominal_text_size;
    if (nominal_text_size*zoom.scale()>max_text_size) text_size = max_text_size/zoom.scale();
    text.style("font-size",text_size + "px");

g.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")");
	});
	 
  svg.call(zoom);	  
	
  resize();
  //window.focus();
  d3.select(window).on("resize", resize).on("keydown", keydown);
	  
  force.on("tick", function() {
  	
    node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
    text.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
  
    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("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
	});
  
  function resize() {
    var width = window.innerWidth, height = window.innerHeight;
	svg.attr("width", width).attr("height", height);
    
	force.size([force.size()[0]+(width-w)/zoom.scale(),force.size()[1]+(height-h)/zoom.scale()]).resume();
    w = width;
	h = height;
	}
	
	function keydown() {
	if (d3.event.keyCode==32) {  force.stop();}
	else if (d3.event.keyCode>=48 && d3.event.keyCode<=90 && !d3.event.ctrlKey && !d3.event.altKey && !d3.event.metaKey)
	{
  switch (String.fromCharCode(d3.event.keyCode)) {
    case "C": keyc = !keyc; break;
    case "S": keys = !keys; break;
	case "T": keyt = !keyt; break;
	case "R": keyr = !keyr; break;
    case "X": keyx = !keyx; break;
	case "D": keyd = !keyd; break;
	case "L": keyl = !keyl; break;
	case "M": keym = !keym; break;
	case "H": keyh = !keyh; break;
	case "1": key1 = !key1; break;
	case "2": key2 = !key2; break;
	case "3": key3 = !key3; break;
	case "0": key0 = !key0; break;
  }
  	
  link.style("display", function(d) {
				var flag  = vis_by_type(d.source.type)&&vis_by_type(d.target.type)&&vis_by_node_score(d.source.score)&&vis_by_node_score(d.target.score)&&vis_by_link_score(d.score);
				linkedByIndex[d.source.index + "," + d.target.index] = flag;
              return flag?"inline":"none";});
  node.style("display", function(d) {
				return (key0||hasConnections(d))&&vis_by_type(d.type)&&vis_by_node_score(d.score)?"inline":"none";});
  text.style("display", function(d) {
                return (key0||hasConnections(d))&&vis_by_type(d.type)&&vis_by_node_score(d.score)?"inline":"none";});
				
				if (highlight_node !== null)
				{
					if ((key0||hasConnections(highlight_node))&&vis_by_type(highlight_node.type)&&vis_by_node_score(highlight_node.score)) { 
					if (focus_node!==null) set_focus(focus_node);
					set_highlight(highlight_node);
					}
					else {exit_highlight();}
				}

}	
}
 
});

function vis_by_link_score(score)
{
	if (isNumber(score))
	{
	if (score>=0.666) return key3;
	else if (score>=0.333) return key2;
	else if (score>=0) return key1;
}
	return true;
}

function isNumber(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);
}

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

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