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<!DOCTYPE html> | |
<html> | |
<head> | |
<style> | |
body { | |
text-align: center; | |
} | |
button { | |
font-size: 24px; | |
} | |
</style> | |
</head> | |
<body> | |
<button>Add data</button> | |
<div></div> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script> | |
var diameter = 250, | |
circleSize = d3.scaleLinear().range([100, 5000000]); | |
var svg = d3.select("div") | |
.append("svg") | |
.attr("width", diameter * 2) | |
.attr("height", diameter * 2) | |
.append("g") | |
.attr("transform", "translate(" + diameter / 2 + " " + diameter / 2 + ")"); | |
var children = initialLayout(randomData(40)); | |
var radiusScale = d3 | |
.scaleSqrt() | |
.domain([children[0].value, children[1].value]) | |
.range([children[0].r, children[1].r]); | |
d3.select("button").on("click", function() { | |
addCircle(); | |
render(); | |
}); | |
render(); | |
function render() { | |
var circles = svg | |
.selectAll("circle") | |
.data(children, function(d) { | |
return +d.id; | |
}) | |
.style("fill", "white"); | |
var entering = circles | |
.enter() | |
.append("circle") | |
.style("fill", "yellow") | |
.style("stroke", "black") | |
.attr("r", 0) | |
.attr("cx", d => d.x) | |
.attr("cy", d => d.y); | |
circles | |
.merge(entering) | |
.transition() | |
.duration(500) | |
.attr("cx", d => d.x) | |
.attr("cy", d => d.y) | |
.attr("r", d => d.r); | |
} | |
function addCircle() { | |
var newValue = circleSize(Math.random()), | |
neighbor = d3.scan(children, function(a, b) { | |
return Math.abs(a.value - newValue) - Math.abs(b.value - newValue) | |
}), | |
newNode = { | |
r: radiusScale(newValue), | |
id: children.length + 1, | |
x: children[neighbor].x, | |
y: children[neighbor].y, | |
}, | |
links = [{ | |
distance: newNode.r + children[neighbor].r, | |
source: children.length, | |
target: neighbor | |
}]; | |
children.push(newNode); | |
children.forEach(function(d) { | |
d.x0 = d.x; | |
d.y0 = d.y; | |
}); | |
var simulation = d3 | |
.forceSimulation(children) | |
.force("cx", d3.forceX().x(d => diameter / 2).strength(0.02)) | |
.force("cy", d3.forceY().y(d => diameter / 2).strength(0.02)) | |
.force("link", d3.forceLink(links).distance(d => d.distance).strength(0.5)) | |
.force("x", d3.forceX().x(d => d.x0).strength(0.1)) | |
.force("y", d3.forceY().y(d => d.y0).strength(0.1)) | |
.force("collide", d3.forceCollide().strength(0.8).radius(d => d.r + 1)) | |
.stop(); | |
while (simulation.alpha() > 0.001) { | |
simulation.tick(); | |
} | |
} | |
function initialLayout(data) { | |
var stratify = d3 | |
.stratify() | |
.id(d => d.id) | |
.parentId(d => d.parent); | |
var pack = d3.pack().size([diameter - 4, diameter - 4]); | |
var root = stratify(data) | |
.sum(d => d.size) | |
.sort((a, b) => b.value - a.value); | |
return pack(root).leaves(); | |
} | |
function randomData(numNodes) { | |
return d3.range(numNodes).map(function(d) { | |
return { | |
id: d, | |
name: d ? "Leaf" : "Root", | |
size: circleSize(Math.random()), | |
parent: d ? 0 : undefined | |
}; | |
}); | |
} | |
</script> | |
</body> | |
</html> |
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