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| var width = 400, | |
| height = 500, | |
| shiftKey; | |
| var svg = d3.select("body") | |
| .attr("tabindex", 1) | |
| .on("keydown.brush", keydown) | |
| .on("keyup.brush", keyup) | |
| .each(function() { this.focus(); }) | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var link = svg.append("g") | |
| .attr("class", "link") | |
| .selectAll("line"); | |
| var brush = svg.append("g") | |
| .datum(function() { return {selected: false, previouslySelected: false}; }) | |
| .attr("class", "brush"); | |
| var node = svg.append("g") | |
| .attr("class", "node") | |
| .selectAll("circle"); | |
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| |
| graph.links.forEach(function(d) { | |
| d.source = graph.nodes[d.source]; | |
| d.target = graph.nodes[d.target]; | |
| }); | |
| link = link.data(graph.links).enter().append("line") | |
| .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; }); | |
| brush.call(d3.svg.brush() | |
| .x(d3.scale.identity().domain([0, width])) | |
| .y(d3.scale.identity().domain([0, height])) | |
| .on("brushstart", function(d) { | |
| node.each(function(d) { d.previouslySelected = shiftKey && d.selected; }); | |
| }) | |
| .on("brush", function() { | |
| var extent = d3.event.target.extent(); | |
| node.classed("selected", function(d) { | |
| return d.selected = d.previouslySelected ^ | |
| (extent[0][0] <= d.x && d.x < extent[1][0] | |
| && extent[0][1] <= d.y && d.y < extent[1][1]); | |
| }); | |
| }) | |
| .on("brushend", function() { | |
| d3.event.target.clear(); | |
| d3.select(this).call(d3.event.target); | |
| })); | |
| var force = d3.layout.force() | |
| .charge(-120) | |
| .linkDistance(30) | |
| .nodes(graph.nodes) | |
| .links(graph.links) | |
| .size([width, height]) | |
| .start(); | |
| node = node.data(graph.nodes).enter().append("circle") | |
| .attr("r", 4) | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }) | |
| .on("mousedown", function(d) { | |
| if (!d.selected) { // Don't deselect on shift-drag. | |
| if (!shiftKey) node.classed("selected", function(p) { return p.selected = d === p; }); | |
| else d3.select(this).classed("selected", d.selected = true); | |
| } | |
| }) | |
| .on("mouseup", function(d) { | |
| if (d.selected && shiftKey) d3.select(this).classed("selected", d.selected = false); | |
| }) | |
| .call(d3.behavior.drag() | |
| .on("dragstart", function(d1) { | |
| node.filter(function(d) { return d.selected; }) | |
| .each(function(d) { d.fixed |= 2; }) | |
| }) | |
| .on("drag", function(d1) { | |
| node.filter(function(d) { return d.selected; }) | |
| .each(function(d) { | |
| d.x += d3.event.dx; | |
| d.y += d3.event.dy; | |
| d.px += d3.event.dx; | |
| d.py += d3.event.dy; | |
| }) | |
| force.resume(); | |
| }) | |
| .on("dragend", function(d) { | |
| node.filter(function(d) { return d.selected; }) | |
| .each(function(d) { d.fixed &= ~6; }) | |
| })); | |
| function tick() { | |
| 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; }); | |
| }; | |
| force.on("tick", tick); | |
| function keydown() { | |
| shiftKey = d3.event.shiftKey || d3.event.metaKey; | |
| } | |
| function keyup() { | |
| shiftKey = d3.event.shiftKey || d3.event.metaKey; | |
| } |
Author
Hey, to get labels take a look at this example:
http://bl.ocks.org/mbostock/950642
Instead of just having circles whose cx and cy attributes are set using the force layout, you'll want to create g elements whose transform attribute will be set in the tick function. This g will then contain a circle and text children for the node and label, respectively.
Thanks for this. Learn a lot from it.
Thank you for the code. I followed your instruction but couldn't get what I expected:
I defined the transform function outside:
var transform = d3.transform(function tick() {
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; });
})
and then:
node = node.data(graph.nodes).enter()
.append("g")
.attr(transform)
.append("circle")
.attr("r", 8)
.append("text).text(function(d) { return d.label; })
.on("dblclick", function(d) { d3.event.stopPropagation(); })
."rest of the code"
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Hey, how are you doing? Awesome work here, I was trying something and I'd like to add some texts labels to each node, I've been doing something like this
What am I doing wrong? Do I need to change something in your code? I'm newbie using d3.js
Thanks!