d3-test

http://bl.ocks.org/MoritzStefaner/1377729

<title>Force based label placement</title> <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.6.0"></script> <script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?2.6.0"></script> <script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js?2.6.0"></script> <script type="text/javascript" charset="utf-8"> var w = 960, h = 500;

		var labelDistance = 0;

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

		var nodes = [];
		var labelAnchors = [];
		var labelAnchorLinks = [];
		var links = [];

		for(var i = 0; i < 30; i++) {
			var node = {
				label : "node " + i
			};
			nodes.push(node);
			labelAnchors.push({
				node : node
			});
			labelAnchors.push({
				node : node
			});
		};

		for(var i = 0; i < nodes.length; i++) {
			for(var j = 0; j < i; j++) {
				if(Math.random() > .95)
					links.push({
						source : i,
						target : j,
						weight : Math.random()
					});
			}
			labelAnchorLinks.push({
				source : i * 2,
				target : i * 2 + 1,
				weight : 1
			});
		};

		var force = d3.layout.force().size([w, h]).nodes(nodes).links(links).gravity(1).linkDistance(50).charge(-3000).linkStrength(function(x) {
			return x.weight * 10
		});


		force.start();

		var force2 = d3.layout.force().nodes(labelAnchors).links(labelAnchorLinks).gravity(0).linkDistance(0).linkStrength(8).charge(-100).size([w, h]);
		force2.start();

		var link = vis.selectAll("line.link").data(links).enter().append("svg:line").attr("class", "link").style("stroke", "#CCC");

		var node = vis.selectAll("g.node").data(force.nodes()).enter().append("svg:g").attr("class", "node");
		node.append("svg:circle").attr("r", 5).style("fill", "#555").style("stroke", "#FFF").style("stroke-width", 3);
		node.call(force.drag);


		var anchorLink = vis.selectAll("line.anchorLink").data(labelAnchorLinks)//.enter().append("svg:line").attr("class", "anchorLink").style("stroke", "#999");

		var anchorNode = vis.selectAll("g.anchorNode").data(force2.nodes()).enter().append("svg:g").attr("class", "anchorNode");
		anchorNode.append("svg:circle").attr("r", 0).style("fill", "#FFF");
			anchorNode.append("svg:text").text(function(d, i) {
			return i % 2 == 0 ? "" : d.node.label
		}).style("fill", "#555").style("font-family", "Arial").style("font-size", 12);

		var updateLink = function() {
			this.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;
			});

		}

		var updateNode = function() {
			this.attr("transform", function(d) {
				return "translate(" + d.x + "," + d.y + ")";
			});

		}


		force.on("tick", function() {

			force2.start();

			node.call(updateNode);

			anchorNode.each(function(d, i) {
				if(i % 2 == 0) {
					d.x = d.node.x;
					d.y = d.node.y;
				} else {
					var b = this.childNodes[1].getBBox();

					var diffX = d.x - d.node.x;
					var diffY = d.y - d.node.y;

					var dist = Math.sqrt(diffX * diffX + diffY * diffY);

					var shiftX = b.width * (diffX - dist) / (dist * 2);
					shiftX = Math.max(-b.width, Math.min(0, shiftX));
					var shiftY = 5;
					this.childNodes[1].setAttribute("transform", "translate(" + shiftX + "," + shiftY + ")");
				}
			});


			anchorNode.call(updateNode);

			link.call(updateLink);
			anchorLink.call(updateLink);

		});

	</script>
</body>