|
<!DOCTYPE html> |
|
<svg width="960" height="500"></svg> |
|
<script src="https://d3js.org/d3.v4.min.js"></script> |
|
<script> |
|
|
|
var svg = d3.select("svg"), |
|
width = +svg.attr("width"), |
|
height = +svg.attr("height"), |
|
color = d3.scaleOrdinal(d3.schemeCategory10); |
|
|
|
var a = {id: "a"}, |
|
b = {id: "b"}, |
|
c = {id: "c"}, |
|
nodes = [a, b, c], |
|
links = []; |
|
|
|
var simulation = d3.forceSimulation(nodes) |
|
.force("charge", d3.forceManyBody().strength(-1000)) |
|
.force("link", d3.forceLink(links).distance(200)) |
|
.force("x", d3.forceX()) |
|
.force("y", d3.forceY()) |
|
.alphaTarget(1) |
|
.on("tick", ticked); |
|
|
|
var g = svg.append("g").attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"), |
|
link = g.append("g").attr("stroke", "#000").attr("stroke-width", 1.5).selectAll(".link"), |
|
node = g.append("g").attr("stroke", "#fff").attr("stroke-width", 1.5).selectAll(".node"); |
|
|
|
restart(); |
|
|
|
d3.timeout(function() { |
|
links.push({source: a, target: b}); // Add a-b. |
|
links.push({source: b, target: c}); // Add b-c. |
|
links.push({source: c, target: a}); // Add c-a. |
|
restart(); |
|
}, 1000); |
|
|
|
d3.interval(function() { |
|
nodes.pop(); // Remove c. |
|
links.pop(); // Remove c-a. |
|
links.pop(); // Remove b-c. |
|
restart(); |
|
}, 2000, d3.now()); |
|
|
|
d3.interval(function() { |
|
nodes.push(c); // Re-add c. |
|
links.push({source: b, target: c}); // Re-add b-c. |
|
links.push({source: c, target: a}); // Re-add c-a. |
|
restart(); |
|
}, 2000, d3.now() + 1000); |
|
|
|
function restart() { |
|
|
|
// Apply the general update pattern to the nodes. |
|
node = node.data(nodes, function(d) { return d.id;}); |
|
node.exit().remove(); |
|
node = node.enter().append("circle").attr("fill", function(d) { return color(d.id); }).attr("r", 8).merge(node); |
|
|
|
// Apply the general update pattern to the links. |
|
link = link.data(links, function(d) { return d.source.id + "-" + d.target.id; }); |
|
link.exit().remove(); |
|
link = link.enter().append("line").merge(link); |
|
|
|
// Update and restart the simulation. |
|
simulation.nodes(nodes); |
|
simulation.force("link").links(links); |
|
simulation.alpha(1).restart(); |
|
} |
|
|
|
function ticked() { |
|
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; }); |
|
} |
|
|
|
</script> |
