d3.js初心者です．
よくjqueryと似ている！なんていう話をネットで見ますが，自分はjqueryもよく知らないので，ひたすら値を変えてメソッドの役割を自分なりにまとめていきます．
説明書的な英語読まずに書いていくので意味がバカっぽくなるかもしれません
初期状態
サンプルコード
<script></script>を抜粋
ForceLayout.html
<script type="text/javascript">
var miserables = {
"nodes":[
{"name":"Myriel","group":1},
{"name":"Napoleon","group":1},
{"name":"Mlle.Baptistine","group":1},
{"name":"Mme.Magloire","group":1},
{"name":"CountessdeLo","group":1},
{"name":"Geborand","group":1},
{"name":"Champtercier","group":1},
{"name":"Cravatte","group":1},
{"name":"Count","group":1},
{"name":"OldMan","group":1},
{"name":"Labarre","group":2},
{"name":"Valjean","group":2},
{"name":"Marguerite","group":3},
{"name":"Mme.deR","group":2},
{"name":"Isabeau","group":2},
{"name":"Gervais","group":2},
{"name":"Tholomyes","group":3},
{"name":"Listolier","group":3},
{"name":"Fameuil","group":3},
{"name":"Blacheville","group":3},
{"name":"Favourite","group":3},
{"name":"Dahlia","group":3},
{"name":"Zephine","group":3},
{"name":"Fantine","group":3},
{"name":"Mme.Thenardier","group":4},
{"name":"Thenardier","group":4},
{"name":"Cosette","group":5},
{"name":"Javert","group":4},
{"name":"Fauchelevent","group":0},
{"name":"Bamatabois","group":2},
{"name":"Perpetue","group":3},
{"name":"Simplice","group":2},
{"name":"Scaufflaire","group":2},
{"name":"Woman1","group":2},
{"name":"Judge","group":2},
{"name":"Champmathieu","group":2},
{"name":"Brevet","group":2},
{"name":"Chenildieu","group":2},
{"name":"Cochepaille","group":2},
{"name":"Pontmercy","group":4},
{"name":"Boulatruelle","group":6},
{"name":"Eponine","group":4},
{"name":"Anzelma","group":4},
{"name":"Woman2","group":5},
{"name":"MotherInnocent","group":0},
{"name":"Gribier","group":0},
{"name":"Jondrette","group":7},
{"name":"Mme.Burgon","group":7},
{"name":"Gavroche","group":8},
{"name":"Gillenormand","group":5},
{"name":"Magnon","group":5},
{"name":"Mlle.Gillenormand","group":5},
{"name":"Mme.Pontmercy","group":5},
{"name":"Mlle.Vaubois","group":5},
{"name":"Lt.Gillenormand","group":5},
{"name":"Marius","group":8},
{"name":"BaronessT","group":5},
{"name":"Mabeuf","group":8},
{"name":"Enjolras","group":8},
{"name":"Combeferre","group":8},
{"name":"Prouvaire","group":8},
{"name":"Feuilly","group":8},
{"name":"Courfeyrac","group":8},
{"name":"Bahorel","group":8},
{"name":"Bossuet","group":8},
{"name":"Joly","group":8},
{"name":"Grantaire","group":8},
{"name":"MotherPlutarch","group":9},
{"name":"Gueulemer","group":4},
{"name":"Babet","group":4},
{"name":"Claquesous","group":4},
{"name":"Montparnasse","group":4},
{"name":"Toussaint","group":5},
{"name":"Child1","group":10},
{"name":"Child2","group":10},
{"name":"Brujon","group":4},
{"name":"Mme.Hucheloup","group":8}
],
"links":[
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]
}
var width = 960;
var height = 500;
var color = d3.scale.category20();
var force = d3.layout.force()
.size([width, height])
.nodes(miserables.nodes)
.links(miserables.links)
.start();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var link = svg.selectAll(".link")
.data(miserables.links)
.enter().append("line")
.attr("class", "link")
.style("stroke-width", function(d) { return Math.sqrt(d.value); });
var node = svg.selectAll(".node")
.data(miserables.nodes)
.enter().append("circle")
.attr("class", "node")
.attr("r", 5)
.style("fill", function(d) { return color(d.group); })
.call(force.drag);
node.append("title")
.text(function(d) { return d.name; });
force.on("tick", function() {
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) { return d.x; })
.attr("cy", function(d) { return d.y; });
});
</script>
初期のグラフ
密集してる感がある
変更を加えていく
変更を加えるのは以下だけ
ForceLayoutのとこだけ！
var force = d3.layout.force()
.size([width, height])
.nodes(miserables.nodes)
.links(miserables.links)
.start();
.links()と.start()の間にメソッドを入れ替えて変化を調査していく．
メソッドの説明は読まないけど，wikiのメソッド一覧みたいなものを試していく
メソッド一覧みたいなやつ
var force = d3.layout.force()
.nodes(nodes)
.links(links)
.size([w, h])
.linkStrength(0.1)
.friction(0.9)
.linkDistance(20)
.charge(-30)
.gravity(0.1)
.theta(0.8)
.alpha(0.1)
.start();
linkStrength()
0~1までの値を取るらしい，そしてdefaultは0.9らしい
(すでに説明読んでるけど...)
min=0
default=0.9の初期のグラフに比べてノード間の引力？的なものが弱まった印象
friction()
0~1までの値を取るらしい，そしてdefaultは0.9らしい
min = 0
default=0.9にめっちゃキュってなった
frictionって摩擦だよなと思い，max=1にして実行したところめっちゃ動きました
スクショじゃ表現できないから割愛
キュってなった原因はちょっとわからない
linkDistance()
default = 20
100でやってみた
リンクが長くなった
0でやってみた
ノードがくっつく勢いになりました
スクショ割愛
charge()
default=-30なことはわかった
0でやってみた
またキュってなった
さっぱりわからないっす．．．
gravity()
default=0.1
1でやってみた
今までは1つのノードを動かすとみんなついてきたのに，ついてこなくなった
theta()
default=0.9
リンクされてないノードとの角度書いてたと思う
alpha
0.1でやってみた
2でやってみた
値が大きい方が違うグループがかぶる率が高い気がする．
サンプルに手を加えてみた
この記事で利用しているサンプルに手を加えた
ノードがゆらゆら動いてしまうのを解消し，ドラッグされたノードはピン留め？できるようにした．
Gistに公開しましたのでよろしければどうぞ
おわりに
誰か一人でもこの記事で救われる人がいたら幸いですwww