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d3.forceSimulation - center node
Raw
.block
license: mit
Raw
README.md

常に特定のノードをセンターに置くサンプル

Built with blockbuilder.org

Raw
index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
html, body, #graph {
width: 100%;
height: 100%;
} </style>
</head>
<body>
<div id="graph"></div>
<script>
!(function(){
"use strict"
var width,height
var chartWidth, chartHeight
var margin
var svg = d3.select("#graph").append("svg")
var chartLayer = svg.append("g").classed("chartLayer", true)
main()
function main() {
var range = 40
var data = {
nodes:d3.range(0, range).map(function(d){ return {label: "l"+d ,r:~~d3.randomUniform(8, 28)(), color:"black"}}),
links:d3.range(0, range).map(function(){ return {source:~~d3.randomUniform(range)(), target:~~d3.randomUniform(range)()} })
}
//センターに指定するノードに必ずリンクをつける
data.links.push({source:0, target:~~d3.randomUniform(range)()})
data.links.push({source:0, target:~~d3.randomUniform(range)()})
data.links.push({source:0, target:~~d3.randomUniform(range)()})
data.nodes[0].color = "red";
setSize(data)
drawChart(data)
}
function setSize(data) {
width = document.querySelector("#graph").clientWidth
height = document.querySelector("#graph").clientHeight
margin = {top:0, left:0, bottom:0, right:0 }
chartWidth = width - (margin.left+margin.right)
chartHeight = height - (margin.top+margin.bottom)
svg.attr("width", width).attr("height", height)
chartLayer
.attr("width", chartWidth)
.attr("height", chartHeight)
.attr("transform", "translate("+[margin.left, margin.top]+")")
}
function drawChart(data) {
var simulation = d3.forceSimulation()
.force("link", d3.forceLink().id(function(d) { return d.index }))
.force("collide",d3.forceCollide( function(d){return d.r + 8 }).iterations(16) )
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(chartWidth / 2, chartHeight / 2))
.velocityDecay(0.4)
.alphaTarget(0.1);
var link = svg.append("g")
.attr("class", "links")
.selectAll("line")
.data(data.links)
.enter()
.append("line")
.attr("stroke", "black")
var node = svg.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(data.nodes)
.enter().append("circle")
.attr("cx", chartWidth / 2)
.attr("cy", chartHeight / 2)
.attr("r", function(d){ return d.r })
.attr("fill", function(d){ return d.color })
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
var ticked = function() {
data.nodes[0].fx = chartWidth / 2;
data.nodes[0].fy = chartHeight / 2;
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, i) { return d.x; })
.attr("cy", function(d, i) { return d.y; });
}
simulation
.nodes(data.nodes)
.on("tick", ticked);
simulation.force("link")
.links(data.links);
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
}
}());
</script>
</script>
</body>
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