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<!DOCTYPE html> |
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<html lang="en"> |
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<head> |
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<meta charset="UTF-8"> |
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<meta name="viewport" content="width=device-width, initial-scale=1.0"> |
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<meta http-equiv="X-UA-Compatible" content="ie=edge"> |
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<script src="https://d3js.org/d3.v4.min.js"></script> |
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<title>Document</title> |
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</head> |
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<body> |
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<svg width="960" height="500"></svg> |
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<script> |
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var svg = d3.select("svg"), |
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width = +svg.attr("width"), |
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height = +svg.attr("height"), |
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color = d3.scaleOrdinal(d3.schemeCategory10); |
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var a = { id: "a" }, |
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b = { id: "b" }, |
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c = { id: "c" }, |
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nodes = [a, b, c], |
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links = []; |
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var simulation = d3.forceSimulation(nodes) |
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.force("charge", d3.forceManyBody().strength(-1000)) |
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.force("link", d3.forceLink(links).distance(200)) |
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.force("x", d3.forceX()) |
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.force("y", d3.forceY()) |
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.alphaTarget(1) |
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.on("tick", ticked); |
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var g = svg.append("g").attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"), |
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link = g.append("g").attr("stroke", "#000").attr("stroke-width", 1.5).selectAll(".link"), |
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node = g.append("g").attr("stroke", "#fff").attr("stroke-width", 1.5).selectAll(".node"); |
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restart(); |
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d3.timeout(function () { |
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links.push({ source: a, target: b }); // Add a-b. |
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links.push({ source: b, target: c }); // Add b-c. |
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links.push({ source: c, target: a }); // Add c-a. |
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restart(); |
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}, 5000); |
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d3.interval(function () { |
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nodes.pop(); // Remove c. |
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links.pop(); // Remove c-a. |
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links.pop(); // Remove b-c. |
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restart(); |
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}, 2000, d3.now()); |
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d3.interval(function () { |
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nodes.push(c); // Re-add c. |
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links.push({ source: b, target: c }); // Re-add b-c. |
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links.push({ source: c, target: a }); // Re-add c-a. |
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restart(); |
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}, 2000, d3.now() + 1000); |
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function restart() { |
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// Apply the general update pattern to the nodes. |
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node = node.data(nodes, function (d) { return d.id; }); |
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node.exit().remove(); |
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node = node.enter().append("circle").attr("fill", function (d) { return color(d.id); }).attr("r", 8).merge(node); |
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// Apply the general update pattern to the links. |
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link = link.data(links, function (d) { return d.source.id + "-" + d.target.id; }); |
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link.exit().remove(); |
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link = link.enter().append("line").merge(link); |
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// Update and restart the simulation. |
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simulation.nodes(nodes); |
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simulation.force("link").links(links); |
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simulation.alpha(1).restart(); |
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} |
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function ticked() { |
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console.count("alpha", simulation.alpha()); |
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console.count("alphaTarget", simulation.alphaTarget()); |
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node.attr("cx", function (d) { return d.x; }) |
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.attr("cy", function (d) { return d.y; }) |
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link.attr("x1", function (d) { return d.source.x; }) |
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.attr("y1", function (d) { return d.source.y; }) |
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.attr("x2", function (d) { return d.target.x; }) |
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.attr("y2", function (d) { return d.target.y; }); |
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} |
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</script> |
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</body> |
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</html> |
