NLGraph.js, a JavaScript library for node-link graph (NetWork) visualization version 0.3.4

Advantages:

1. Multi-edges rendering between two nodes
1. Readable edge labeling
1. Multiple shapes rendering for nodes/links
1. Flexible event handling
1. Individual node/link styling
1. Snapshotting
1. Ease of maintenance and extension
Demo1 - used by GraphSQL products
Demo2 - fraud detection
Demo3 - flight search1
Demo4 - flight search2
Demo5 - prototype
Demo6 - misc

Contact

Chong Zhang

Homepage: https://chongzhang-vis.github.io
e-mail: chongzhang.nc@gmail.com

Licence

Installation

Reference the NLGraph.min.v*.js and nlgraph.css files located under build/ in your HTML webpage, i.e.,

<link rel="stylesheet" href="../build/nlgraph.css" />
<script src="../build/NLGraph.min.v0.3.4.js"></script>

Example Data

var newdata = {
     
    "nodes": [
            {"id": "0", "type": "usr", "attr": {"a1": 1, "a2": 2}, "style": {"size": 100, "shape": "square", "fill": "#ff5500", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 1, "label": {"stroke": "black", "fill": "yellow"}}},
            {"id": "1", "type": "tag", "attr": {"a1": 1, "a2": 2}, "style": {"size": 100, "shape": "circle", "fill": "#005500", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 0.8}},
            {"id": "2", "type": "usr", "attr": {"a1": 1, "a2": 2}, "style": {"size": 10, "shape": "cross", "fill": "#0055ff", "stroke": "#ccc", "strokeWidth": 1, "dashed": false, "opacity": 0.7}},
            {"id": "3", "type": "movie", "attr": {"a1": 1, "a2": 2}, "style": {"size": 60, "shape": "hexagon", "fill": "#ff5500", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 0.6}},
            {"id": "4", "type": "tag", "attr": {"a1": 1, "a2": 2}, "style": {"size": 10, "shape": "diamond", "fill": "#E377C2", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 1}},
            {"id": "5", "type": "movie", "attr": {"a1": 1, "a2": 2}, "style": {"size": 60, "shape": "circle", "fill": "#E377C2", "stroke": "#ccc", "strokeWidth": 1, "dashed": false, "opacity": 0.9}},
            {"id": "6", "type": "usr", "attr": {"a1": 1, "a2": 2}, "style": {"size": 10,"shape": "cross", "fill": "#E377C2", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 0.5}},
            {"id": "7", "type": "tag", "attr": {"a1": 1, "a2": 2}, "style": {"size": 20, "shape": "star", "fill": "#1F77B4", "stroke": "#ccc", "strokeWidth": 1, "dashed": false, "opacity": 0.4}},
            {"id": "8", "type": "usr", "attr": {"a1": 1, "a2": 2, "a3": 4, "a4": 5}, "style": {"size": 60, "shape": "square", "fill": "#1F77B4", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 1}},
            {"id": "9", "type": "tag", "attr": {"a1": 1, "a2": 2}, "style": {"size": 10, "shape": "diamond", "fill": "#1F77B4", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 0.9}},
            {"id": "10", "type": "usr", "attr": {"a1": 1, "a2": 2}, "style": {"size": 60, "shape": "square", "fill": "#2CA02C", "stroke": "#ccc", "strokeWidth": 1, "dashed": false, "opacity": 0.8}},
            {"id": "11", "type": "movie", "attr": {"a1": 1, "a2": 2}, "style": {"size": 10, "shape": "diamond", "fill": "#2CA02C", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 0.7}},
            {"id": "12", "type": "usr", "attr": {"a1": 1, "a2": 2}, "style": {"size": 60, "shape": "hexagon", "fill": "#2CA02C", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 0.6}}],
	    
	    
	    
    "links": [
    	{"source": {"id": 8, "type": "usr"}, "target": {"id": 9, "type": "tag"}, "etype": "adf", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#2CA02C", "strokeWidth": 1, "dashed": false, "opacity": 0.9}, "directed": false},
            {"source": {"id": 5, "type": "movie"}, "target": {"id": 0, "type": "usr"}, "etype": "fdd", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#2CA02C", "strokeWidth": 1, "dashed": true, "opacity": 0.6}, "directed": false},
            {"source": {"id": 0, "type": "usr"}, "target": {"id": 6, "type": "usr"}, "etype": "eew", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#ccc", "strokeWidth": 1, "dashed": false, "opacity": 0.5}, "directed": true},
            {"source": {"id": 1, "type": "tag"}, "target": {"id": 3, "type": "movie"}, "etype": "eer", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#E377C2", "strokeWidth": 1, "dashed": true, "opacity": 0.4}, "directed": true},
            {"source": {"id": 8, "type": "usr"}, "target": {"id": 4, "type": "tag"}, "etype": "dff", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#2CA02C", "strokeWidth": 1, "dashed": false, "opacity": 1}, "directed": false},
            {"source": {"id": 5, "type": "movie"}, "target": {"id": 1, "type": "tag"}, "etype": "sdf", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#E377C2", "strokeWidth": 1, "dashed": true, "opacity": 1}, "directed": true},
            {"source": {"id": 5, "type": "movie"}, "target": {"id": "12**##", "type": "usr"}, "etype": "bbc", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 0.5}, "directed": true},
            {"source": {"id": 8, "type": "usr"}, "target": {"id": 11, "type": "movie"}, "etype": "bbd", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#1F77B4", "strokeWidth": 1, "dashed": false, "opacity": 0.9}, "directed": true},
            {"source": {"id": 2, "type": "usr"}, "target": {"id": 9, "type": "tag"}, "etype": "ssb", "attr": {"aa1": "Hello, world, this, is", "aa2": "JavaScript"}, "style": {"stroke": "#E377C2", "strokeWidth": 1, "dashed": true, "opacity": 0.8}, "directed": true},
            {"source": {"id": 2, "type": "usr"}, "target": {"id": 9, "type": "tag"}, "etype": "cca", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#2CA02C", "strokeWidth": 1, "dashed": false, "opacity": 0.7}, "directed": true},
            {"source": {"id": 2, "type": "usr"}, "target": {"id": 9, "type": "tag"}, "etype": "ccb", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#2CA02C", "strokeWidth": 1, "dashed": false, "opacity": 0.7}, "directed": true},
            //{"source": {"id": 9, "type": "tag"}, "target": {"id": 2, "type": "usr"}, "etype": "ccb", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#2CA02C", "strokeWidth": 1, "dashed": false, "opacity": 0.7}, "directed": true},
            {"source": {"id": 2, "type": "usr"}, "target": {"id": 9, "type": "tag"}, "etype": "ccc", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#2CA02C", "strokeWidth": 1, "dashed": false, "opacity": 0.7}, "directed": true},
            {"source": {"id": 2, "type": "usr"}, "target": {"id": 9, "type": "tag"}, "etype": "ccd", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#2CA02C", "strokeWidth": 1, "dashed": false, "opacity": 0.7}, "directed": true},
            {"source": {"id": 4, "type": "tag"}, "target": {"id": 6, "type": "usr"}, "etype": "bbs", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#1F77B4", "strokeWidth": 1, "dashed": true, "opacity": 0.6}, "directed": true},
            {"source": {"id": 4, "type": "tag"}, "target": {"id": 6, "type": "usr"}, "etype": "bbd", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#1F77B4", "strokeWidth": 1, "dashed": false, "opacity": 0.9}, "directed": true},
            //grey
            {"source": {"id": 1, "type": "tag"}, "target": {"id": 0, "type": "usr"}, "etype": "abc", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 1}, "directed": true},
            //green
            {"source": {"id": 0, "type": "usr"}, "target": {"id": 1, "type": "tag"}, "etype": "adf", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#00ff00", "strokeWidth": 1, "dashed": false, "opacity": 1}, "directed": true},
            {"source": {"id": 7, "type": "tag"}, "target": {"id": 8, "type": "usr"}, "etype": "bbs", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#ccc", "strokeWidth": 1, "dashed": false, "opacity": 0.7}, "directed": false},
            {"source": {"id": 8, "type": "usr"}, "target": {"id": 7, "type": "tag"}, "etype": "cca", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#ccc", "strokeWidth": 1, "dashed": false, "opacity": 0.7}, "directed": false},
            {"source": {"id": 7, "type": "tag"}, "target": {"id": 8, "type": "usr"}, "etype": "bbc", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#ccc", "strokeWidth": 1, "dashed": false, "opacity": 0.7}, "directed": false},
            //green
            {"source": {"id": 3, "type": "movie"}, "target": {"id": 10, "type": "usr"}, "etype": "cca", "attr": {"aa1": 2323, "aa2": 4545}, "style": {"stroke": "green", "strokeWidth": 1, "dashed": true, "opacity": 1}, "directed": true},
            //blue
            {"source": {"id": 3, "type": "movie"}, "target": {"id": 10, "type": "usr"}, "etype": "bbs", "attr": {"aa1": 3333, "aa2": 4444}, "style": {"stroke": "#0000ff", "strokeWidth": 1, "dashed": true, "opacity": 1}, "directed": true},
            //yellow
            {"source": {"id": 10, "type": "usr"}, "target": {"id": 3, "type": "movie"}, "etype": "cca", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "goldenrod", "strokeWidth": 1, "dashed": false, "opacity": 0.5}, "directed": true},
            //red
            {"source": {"id": 10, "type": "usr"}, "target": {"id": 3, "type": "movie"}, "etype": "bbs", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#ff0000", "strokeWidth": 1, "dashed": false, "opacity": 1}, "directed": true}

            ]
        };

Usage

    var el = document.getElementById("container"),
        options = {
            width: 1400,
            height: 800,
            zoomScaleExtent: [0.4, 8],
            zoomLens: false,
            autofit: true,
            forceSpeed: 1,
            forceStatic: false,
            lineTensionDistance: 15,
            edgeCurve: "linear" // "linear", or "basis"

        };

    var graph = new NLGraph(el, nodes, links, options)
            //.zoom(2) // will not work with autofit = true
            .render();

    for(var i = 0; i < graph.nodes.length; ++i){
        var n = graph.nodes[i];
        graph.setNodeLabel(n.id, n.type, ["id", "type"]);

    }

You may also need to process the nodes and links to

remove duplicates, and
make sure all sources/targets in the links come from the nodes.

Example code:

    var nodeIdx = nodes.map(function(l) { return l.id + "-" + l.type; });
    var newlinks = links.map(function(l){
        if(nodeIdx.indexOf(l.source.id + "-" + l.source.type) != -1){
            return l;
        }

    });
    var uniquelinks = newlinks.reduce(function(a,b){

        function indexOfIDType (a, b){
          for (var i=0;i<a.length;i++){
              if(a[i].source.id == b.source.id
                      && a[i].source.type == b.source.type
                      && a[i].target.id == b.target.id
                      && a[i].target.type == b.target.type
              ){
                   return i;
               }
          }
         return -1;
        }
        if (!b.hasOwnProperty("source")) return a;
        if (!b.source.hasOwnProperty("type")) return a;
        if (!~indexOfIDType(a,b) ) a.push(b);
        return a;
    },[]);

    var uniquenodes = nodes.reduce(function(a,b){

        function indexOfIDType (a, b){
          for (var i=0;i<a.length;i++){
              if(a[i].id == b.id
                      && a[i].type == b.type
              ){
                   return i;
               }
          }
         return -1;
        }
        if (!b.hasOwnProperty("id") || !b.hasOwnProperty("type") ) return a;
        if (!~indexOfIDType(a,b) ) a.push(b);
        return a;
    },[]);

Adding a an event handler

graph.vertices.on("click", function(d){ //console.log(d) })

graph.edges.on("click", function(d){ //console.log(d) })

graph.multiSelect.on("brush", function(){
	// var nodes = graph.getMultiSelectedNodes();
	// var links = graph.getMultiSelectedLinks();
	// ...
  })

graph.zoomL.on("zoom", function() {
	// var currentZoomLevel = graph.getScale();
	// ...
 })

graph.root.on("dblclick.zoom", function(){
    //
});

API

NLGraph(el, n:array, l:array, options:obj)

Creates a new graph on the el element with the given nodes and links.

Available options include:

width: the graph width.
height: the graph height.
force_charge
force_linkStrength
force_friction
force_linkDistance
force_gravity
force_theta
force_coolingAlpha
force_collisionAlpha: used when trying to solve collisions to determine how far from each other to position nodes. Defaults to 0.5.
tickPerFrame: the speed of simulation
staticLayout: true or false for animation
initialScale: initial zoom level
brushingStatus: true or false for brushing widget
zoomLens: true or false for zoomLens widget
autofit: true or false for autofit switch
lineTensionDistance: the gap between neighbor lines for multi-edges rendering
lineCurve: "linear" or "basis"
zoomScaleExtent: [min_zoom_scale, max_zoom_scale]

.hasConnections(node_id, node_type)

Check if a node has links

graph.hasConnections("10","usr")

.center(node_id, node_type)

Bring the node with nodeID and nodeType in the center of the entire viewpoint.

graph.center("6", "usr")

.zoom(scale)

Zooms the graph to the given scale.

.zoomIn()

Zooms in the graph.

.zoomOut()

Zooms out the graph.

.isConnected(n1_id, n1_type, n2_id, n2_type)

Check if two nodes are connected

graph.isConnected("3","movie","10","usr")

.unHide()

Show all nodes, edges, and labels

graph.unHide()

.hasIncomingConnections (node_id, node_type)

Check if a node has any incoming links

graph.hasIncomingConnections("10","usr")

.hasOutgoingConnections(node_id, node_type)

Check if a node has any outgoing links

graph.hasOutgoingConnections("10","usr")

.setNodeStyle(node_id, node_type, styleObj)

Set style for a specified node. The styleObj can have missing key where the graph use the default settings. Shape is one of ["circle", "square", "diamond", "hexagon", "star","cross"]

graph.setNodeStyle("8", "usr", {fill: "#ff0000", strokeWidth: 4, shape: "hexagon"})

.setNodeTypeStyle(type, styleObj)

Set style for a set of node with the specified type. The styleObj can have missing key where the graph use the default settings. Shape is one of ["circle", "square", "diamond", "hexagon", "star","cross"]

graph.setNodeTypeStyle("usr", {fill: "#ff0000", strokeWidth: 4, shape: "hexagon"})

.setEdgeStyle(src_id, src_type, tgt_id, tgt_type, etype, styleObj)

Set style for a specified edge. The styleObj can have missing key where the graph use the default settings

graph.setEdgeStyle("5", "movie", "0", "usr", "fdd", {stroke: "#ff0000", strokeWidth: 4})

.setEdgeTypeStyle(etype, styleObj)

Set style for a set of edges with the specified etype. The styleObj can have missing key where the graph use the default settings

graph.setEdgeTypeStyle("bbc", {stroke: "#ff0000", strokeWidth: 4})

.toggleBrushing()

Toggle brush to select nodes. It will disable zooming, zoomLens, and dragging. (reason: when zoom and brush are both enabled, manipulating the brush causes graph to pan from side to side)

graph.toggleBrushing()

.toggleZoomLens()

Toggle zoomLens to zoom in a small areas without losing sense of the overall graph. It will disable dragging, brushing, and zooming.

graph.toggleZoomLens()

.getAssociatedLinks(nodeId, nodeType)

Retrieve all associated links given a nodeId and nodeType.

graph.getAssociatedLinks('4', 'tag')

.getAssociatedNodes(nodeId, nodeType)

Retrieve all associated nodes given a nodeId and nodeType.

graph.getAssociatedNodes('4', 'tag')

.unSelect()

Deselect nodes that already were selected by removing .selected from the graph

graph.unSelect()

.getSnapshot()

Cache current graph including positions, styles, and statuses.

graph.getSnapshot()

.restoreSnapshot(cache)

Bring cached snapshot back. The argument come from the function .getSnapshot()

graph.restoreSnapshot(cache)

.addNode(node_id, node_type, attrObj, styleObj, assoEdges)

Add a node and associated edges to the existing graph

graph.addNode("11", "movie", {"a1": 1, "a2": 2}, {"size": 80, "shape": "diamond", "fill": "#2CA02C", "stroke": "#ccc", "strokeWidth": 1, "dashed": true, "opacity": 0.7}, [{"source": {"id": 8, "type": "usr"}, "target": {"id": 11, "type": "movie"}, "etype": "bbd", "attr": {"aa1": 3, "aa2": 4}, "style": {"stroke": "#1F77B4", "strokeWidth": 1, "dashed": false, "opacity": 0.9}, "directed": true}])

.addEdge(src_id, src_type, tgt_id, tgt_type, etype, attrObj, styleObj, direc)

Add an edge to the existing graph

graph.addEdge("8", "usr", "11", "movie", "bbd", {"aa1": 3, "aa2": 4}, {"stroke": "#1F77B4", "strokeWidth": 1, "dashed": false, "opacity": 0.9}, true)

.autoFit()

Center the viewport and scale it so that everything fits in the window defined by width and height

graph.autoFit()

.fitDiv(divSelector)

Fit the graph in the specified div

graph.fitDiv("#fit")

.highLight(nodes, edges)

Highlight the specified nodes and edges by applying .unhighlighted to the rest nodes and edges, no others ndoes/edges

graph.highLight([["1", "tag"], ["5", "movie"]], [["8", "usr", "4", "tag", "dff"]])

.unHighlight()

Cancel the .unhighlighted from nodes or edges

graph.unHighlight()

.removeNode(node_id, node_type)

Remove a node with id and type from the graph

graph.removeNode("11", "usr")

.removeEdge(src_id, src_type, tgt_id, tgt_type, etype)

Remove an edge from the graph

graph.removeEdge("8", "usr", "11", "movie", "bbd")

.hideNodes(nodes)

Hide the specified nodes

graph.hideNodes([["1", "tag"], ["7", "tag"]])

.hideEdges(edges)

Hide the specified edges

graph.hideEdges([["4", "tag", "0", "usr", "adx"]])

.setNodeLabel(node_id, node_type, listLabel)

Display a set of attribute values for a specified node

graph.setNodeLabel("6", "usr", ["a1"])

.setEdgeLabel(src_id, src_type, tgt_id, tgt_type, list_of_labels)

Display a set of attribute values for a specified edge

graph.setEdgeLabel("2", "usr", "9", "tag", "ssb", ["aa1", "aa2"])

.setNodeTypeLabel(type, listLabel)

Display a set of attribute values for a set of node with the same type

graph.setNodeTypeLabel("usr", ["type"]), or graph.setNodeTypeLabel("usr", ["a1", "a2"])

.setEdgeTypeLabel(type, list_of_labels)

Display a set of attribute values for a set of edges with the same type

graph.setEdgeTypeLabel("bbc", ["aa1", "aa2"])

.applyLayout(layoutAlgorithm)

Apply a new layout algorithm to the graph;

layoutAlgorithm is a function including how to assign new positions for nodes. It could be defined outside of the library, for example,

function hierarchyLayout(nodes) { // find root node // can change on your own var root = nodes.filter(function(n){ return n.index == 6})[0]; //1, 5, 6 // root node will be on the top of window root.fixed = true; root.x = 700; // could be width / 2; root.y = 120; // the top y position

   var separation_x = 130,
       separation_y = 80;

   var secondLvNodes = graph.getAssociatedNodes(root.id, root.type);
   var deepLv = 2;
   recursiveSetPosition(secondLvNodes, deepLv);

   function recursiveSetPosition(curNodes, depth) {

       var nextDepthNodes = [];

       var widthCount = 0;

       curNodes.forEach(function(n, i) {
           if (!n.fixed) {
               n.fixed = true;
               n.x = (i - widthCount) * separation_x + root.x;
               n.y = separation_y * depth + root.y;

               nextDepthNodes = nextDepthNodes.concat(graph.getAssociatedNodes(n.id, n.type));

           } else {
               widthCount += 1;
           }

       });

       if (nextDepthNodes.length > 0) {

           recursiveSetPosition(nextDepthNodes, ++depth);

       }
   }
}

Then, we can update the layout of the graph with

graph.applyLayout(hierarchyLayout, graph.nodes);

Extension

Add methods to NLGraph

NLGraph.prototype.newMethod = function() {
    // ...
}

Add properties to NLGraph

NLGraph.prototype.newProp = "new_property";

Integration

Add it to GraphFactory

var GraphFactory = (function (graph) {
    // would be private
    var oldPublicMethod = graph.publicMethod;

    graph.NLGraph = NLGraph;
     
    graph.TimeLine = ...;
 
    // export
    return graph;
}(GraphFactory));

GraphFactory definition

var GraphFactory = (function () {
    var graphFactory = {},
        privateVariable = 1;
 
    function privateMethod() {
        // ...
    }
 
    graphFactory.publicProperty = 1;
    // this is just a simple example
    graphFactory.NLGraph = NLGraph;
    // We can also use Factory Pattern to create different types of graph
    };
 
    // export
    return graphFactory;
}());

NOTES

Changing node/edge styles

Even apis can do it, I recommend using css to do so. I have left the node.type/edge.etype as class name of the svg element. For example, in the nlgraph.css, you can modify

.nl_graph .node .movie {
   fill: ...!important;
   stroke: ... !important;
   ...
}

Do not forget to append "!important" to the end of each style.

Brushing, Zooming, and Dragging

Only one of them can work at a time.

Log

*Date: 2015-06-10

Version: 0.3.4
Initial version finished on: 2015-07-10
Could have done better/in a different way:
1. Exception handling
1. Change curve line to straight when two nodes are close and change back when far away
1. Multi-edges could be drawn like they are converging on the source/target rather than outerCircles
1. Change default layout algorithm to hierarchy, circular, pack, etc
Issues fixed since 0.3:
1. Add getSnapShot() and restoreSnapShot(); add deepCopyArrayBoundData();
1. Fixed click event fired on the drag move
1. Set line not to display when two nodes are close
1. Change layout function to customize layout algorithm and provide an example
Issues fixed since 0.2:
1. Attribute getting for labeling
1. Consider node width in autofit
1. Add autofit to options
1. Add forceSpeed to options for the speed of force layout simulation
1. Add lineTensionDistance to options for perpendicular distance between multi-edges
1. Add edgeCurve to options for the curve patter of multi-edges
1. Fix disappeared edge label
1. Change connectString of key of link from underscore to breakline (internal use)
1. Fix arrowheads change when nodes getting closer to other nodes
1. Add static force layout switch to determine the display of animation
1. Change force charge to make sure nodes space out evenly
1. Add individual label outline style (stroke and fill) for node
1. Add an option for collision radius to have a 'normal' force layout (no long/short link distance)
1. Add a function called fitDiv to adjust the graph to a specific div
1. Add default dblclick.zoom as null
1. Apply a map to link key so that nodeid/nodetype can be any characters
1. Fix FireFox bug in .getBBox
1. Change the way drawing multi-edges to fix arrowhead bug when turning round node
1. As requested, the style setting on the fly will reflect on original data structure;
remove resetOpacity(), change unHighlight() and other functions regarding to styles;

Name		Name	Last commit message	Last commit date
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examples		examples
lib		lib
nginx_conf		nginx_conf
src		src
.gitattributes		.gitattributes
.gitignore		.gitignore
README.md		README.md

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