How to allow zoom and individual node movement in force directed graph?

29 views

Skip to first unread message

Nav N

unread,

Apr 23, 2014, 5:11:33 AM4/23/14

to d3...@googlegroups.com

In this example: https://vida.io/documents/T3Ri5pAoXo3xhgHop
A user can zoom in and out using the mouse scroll button. The user can also select a node individually and move it.

But when I tried the same thing locally, the zoom works, but when I try to move a single node with the mouse, the entire graph moves. How can it be controlled separately?

My code:

<html>
<head>
<style id="canvas-style" type="text/css">/* stylesheet for your custom graph */
.link {
fill: none;
stroke: #666;
stroke-width: 1.5px;
}

#licensing {
fill: green;
}

.link.licensing {
stroke: green;
}

.link.resolved {
stroke-dasharray: 0,2 1;
}

circle {
fill: #ccc;
stroke: #333;
stroke-width: 1.5px;
}

text {
font: 10px sans-serif;
pointer-events: none;
text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, 0 -1px 0 #fff, -1px 0 0 #fff;
}</style>
</head>
<body>
<div id="canvas"><svg height="500" width="800"></svg></div>
<div>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
// data comes from uploaded data to vida.io
// if you have your own data, overwrite its value
// drawing area is #canvas, define var svg = d3.select("#canvas")

var links = [
{source: "Microsoft", target: "Amazon", type: "licensing"},
{source: "Microsoft", target: "HTC", type: "licensing"},
{source: "Samsung", target: "Apple", type: "suit"},
{source: "Motorola", target: "Apple", type: "suit"},
{source: "Nokia", target: "Apple", type: "resolved"},
{source: "HTC", target: "Apple", type: "suit"},
{source: "Kodak", target: "Apple", type: "suit"},
{source: "Microsoft", target: "Barnes & Noble", type: "suit"},
{source: "Microsoft", target: "Foxconn", type: "suit"},
{source: "Oracle", target: "Google", type: "suit"},
{source: "Apple", target: "HTC", type: "suit"},
{source: "Microsoft", target: "Inventec", type: "suit"},
{source: "Samsung", target: "Kodak", type: "resolved"},
{source: "LG", target: "Kodak", type: "resolved"},
{source: "RIM", target: "Kodak", type: "suit"},
{source: "Sony", target: "LG", type: "suit"},
{source: "Kodak", target: "LG", type: "resolved"},
{source: "Apple", target: "Nokia", type: "resolved"},
{source: "Qualcomm", target: "Nokia", type: "resolved"},
{source: "Apple", target: "Motorola", type: "suit"},
{source: "Microsoft", target: "Motorola", type: "suit"},
{source: "Motorola", target: "Microsoft", type: "suit"},
{source: "Huawei", target: "ZTE", type: "suit"},
{source: "Ericsson", target: "ZTE", type: "suit"},
{source: "Kodak", target: "Samsung", type: "resolved"},
{source: "Apple", target: "Samsung", type: "suit"},
{source: "Kodak", target: "RIM", type: "suit"},
{source: "Nokia", target: "Qualcomm", type: "suit"}
];

var nodes = {};

// Compute the distinct nodes from the links.
links.forEach(function(link)
{
link.source = nodes[link.source] || (nodes[link.source] = {name: link.source});
link.target = nodes[link.target] || (nodes[link.target] = {name: link.target});
});

var width = 800, height = 500;

var force = d3.layout.force()
    .nodes(d3.values(nodes))
    .links(links)
    .size([width, height])
    .linkDistance(60)
    .charge(-300)
    .on("tick", tick)
    .start();


var zoom = d3.behavior.zoom().on("zoom", zoomed);

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

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

// Per-type markers, as they don't inherit styles.
svg.append("defs").selectAll("marker")
    .data(["suit", "licensing", "resolved"])
    .enter().append("marker")
    .attr("id", function(d) { return d; })
    .attr("viewBox", "0 -5 10 10")
    .attr("refX", 15)
    .attr("refY", -1.5)
    .attr("markerWidth", 6)
    .attr("markerHeight", 6)
    .attr("orient", "auto")
    .append("path")
    .attr("d", "M0,-5L10,0L0,5");

var path = svg.append("g").selectAll("path")
    .data(force.links())
    .enter().append("path")
    .attr("class", function(d) { return "link " + d.type; })
    .attr("marker-end", function(d) { return "url(#" + d.type + ")"; });

var circle = svg.append("g").selectAll("circle")
    .data(force.nodes())
    .enter().append("circle")
    .attr("r", 6)
    .call(force.drag);

var text = svg.append("g").selectAll("text")
    .data(force.nodes())
    .enter().append("text")
    .attr("x", 8)
    .attr("y", ".31em")
    .text(function(d) { return d.name; });

// Use elliptical arc path segments to doubly-encode directionality.
function tick() {
path.attr("d", linkArc);
circle.attr("transform", transform);
text.attr("transform", transform);
}

function linkArc(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;
}

function transform(d) {
return "translate(" + d.x + "," + d.y + ")";
}
</script>
</div>
</body>
</html>

Reply all

Reply to author

Forward

0 new messages