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I've made a force directed graph with d3.js plugin, and I wanna color the nodes and the labels with the different color according to group which they belong.
I've added scale for color:
var color = d3.scale.category20();
and to node variable I've added:
.style("fill", function(d) { return color(d.group); })
but all nodes are in the same color..
Here is my current situation: http://jsfiddle.net/WBkw9/
full script:
var links = [
{source: "John", target: "Mike", group: "5"},
{source: "John", target: "Janice", group: "5"},
{source: "John", target: "Caleb", group: "5"},
{source: "John", target: "Anna", group: "4"},
{source: "John", target: "Tommy", group: "3"},
{source: "John", target: "Jack", group: "2"},
{source: "John", target: "Vilma", group: "1"},
];
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 color = d3.scale.category20();
var width = 960,
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 svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var link = svg.selectAll(".link")
.data(force.links())
.enter().append("line")
.attr("class", "link");
var node = svg.selectAll(".node")
.data(force.nodes())
.enter().append("g")
.attr("class", "node")
.style("fill", function(d) { return color(d.group); })
.on("mouseover", mouseover)
.on("mouseout", mouseout)
.call(force.drag);
node.append("circle")
.attr("r", 8);
node.append("text")
.attr("x", 12)
.attr("dy", ".35em")
.text(function(d) { return d.name; });
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("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
}
function mouseover() {
d3.select(this).select("circle").transition()
.duration(750)
.attr("r", 16);
}
function mouseout() {
d3.select(this).select("circle").transition()
.duration(750)
.attr("r", 8);
}
what am I missing for different color on each group?
873
Your problem is that group is not defined for your data. As a result, all of your nodes are colored for group 'undefined'. Your circles are defined for the data in force.nodes(), which have the attributes index name px py weight x and y. group is only defined for the links, which never have color applied to them.
As it currently stands, there also isn't a clear way to determine what color a node should be. What happens if more than one link connects to a node, and these links are in different groups?
58
Here is my code (based on http://bl.ocks.org/mbostock/4062045). It's working perfectly. You can see how it looks like here : http://jsfiddle.net/Rom2BE/H2PkT/
Each group has a different color.
**index.html**
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.node {
stroke: #fff;
stroke-width: 1.5px;
}
.link {
stroke: #999;
stroke-opacity: .6;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var width = 650,
height = 700;
var color = d3.scale.category10();
var force = d3.layout.force()
.charge(-120)
.linkDistance(30)
.size([width, height]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("data.json", function(error, graph) {
force
.nodes(graph.nodes)
.links(graph.links)
.start();
var link = svg.selectAll(".link")
.data(graph.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
// You define here your nodes and the color will be d.group
var node = svg.selectAll(".node")
.data(graph.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
//Display node name when mouse on a node
node.append("title")
.text(function(d) { return d.name; });
//Where and how nodes are displayed
force.on("tick", function() {
node.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return 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; });
});
//Legend
var legend = svg.selectAll(".legend")
.data(color.domain())
.enter().append("g")
.attr("class", "legend")
.attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
legend.append("rect")
.attr("x", width - 18)
.attr("width", 18)
.attr("height", 18)
.style("fill", color);
legend.append("text")
.attr("x", width - 24)
.attr("y", 9)
.attr("dy", ".35em")
.style("text-anchor", "end")
.text(function(d) { return d; });
});
</script>
**data.json**
{"nodes":[
{"name":"Vertex 5","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 9","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 15","group":"Virtuals-MacBook-Pro-3-53688"},{"name":"Vertex 20","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 26","group":"Virtuals-MacBook-Pro-4-40842"},{"name":"Vertex 29","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 33","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 37","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 49","group":"Virtuals-MacBook-Pro-3-53688"},{"name":"Vertex 52","group":"Virtuals-MacBook-Pro-4-40842"},{"name":"Vertex 53","group":"Virtuals-MacBook-Pro-4-40842"},{"name":"Vertex 58","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 59","group":"Virtuals-MacBook-Pro-4-40842"},{"name":"Vertex 65","group":"Virtuals-MacBook-Pro-4-40842"},{"name":"Vertex 73","group":"Virtuals-MacBook-Pro-4-40842"},{"name":"Vertex 74","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 80","group":"Virtuals-MacBook-Pro-36095"},{"name":"Vertex 84","group":"Virtuals-MacBook-Pro-4-40842"},{"name":"Vertex 87","group":"Virtuals-MacBook-Pro-4-40842"},{"name":"Vertex 99","group":"Virtuals-MacBook-Pro-4-40842"}
],
"links":[
{"source":5,"value":1,"target":11},{"source":5,"value":1,"target":12},{"source":10,"value":1,"target":12},{"source":11,"value":1,"target":5},{"source":11,"value":1,"target":12},{"source":11,"value":1,"target":14},{"source":12,"value":1,"target":5},{"source":12,"value":1,"target":10},{"source":12,"value":1,"target":11},{"source":14,"value":1,"target":11},{"source":16,"value":1,"target":19},{"source":18,"value":1,"target":19},{"source":19,"value":1,"target":16},{"source":19,"value":1,"target":18}
]}
Your group info is only available in the links object, like @ckersch already pointed out. You would need to add the group info to you nodes object too. For this example that can be done by changing line 16 into:
link.target = nodes[link.target] || (nodes[link.target] = {name: link.target, group: link.group});
But for more complex data, with more than one source, all sources would have the same colour (or would that be OK?).
I made that change in this Fiddle: http://jsfiddle.net/WBkw9/19/.
45
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