d3js多個網絡問題

Question

該場景：

我有d3呈現多個網絡。

它由單個節點，多個連接的節點網絡組成。

我正在嘗試附加d3-force（模擬），以便拖動時節點不重疊，整個網絡保持相對定位。

正在使用衆多的力量。

問題：

1. 當仿真負載（simulation.restart（）），整個網絡不斷張開。所有節點/網絡都無限期地離開。
2. 即使拖動來自一個網絡的節點，所有其他網絡也會移動。

如果有人能指出我正確的解決方案，將不勝感激。

繼承人小提琴：https://jsfiddle.net/pdubey84/or0tn49k/2/

var nodes = [ 
    { id: "mammal", group: 0, label: "Mammals", level: 1 }, 
    { id: "dog" , group: 0, label: "Dogs" , level: 2 }, 
    { id: "cat" , group: 0, label: "Cats" , level: 2 }, 
    { id: "fox" , group: 0, label: "Foxes" , level: 2 }, 
    { id: "elk" , group: 0, label: "Elk" , level: 2 }, 
    { id: "insect", group: 1, label: "Insects", level: 1 }, 
    { id: "ant" , group: 1, label: "Ants" , level: 2 }, 
    { id: "bee" , group: 1, label: "Bees" , level: 2 }, 
    { id: "fish" , group: 2, label: "Fish" , level: 1 }, 
    { id: "carp" , group: 2, label: "Carp" , level: 2 }, 
    { id: "pike" , group: 2, label: "Pikes" , level: 2 }, 
    { id: "pike" , group: 3, label: "Pikes" , level: 1 }, 
    { id: "pike" , group: 4, label: "Pikes" , level: 1 }, 
    { id: "pike" , group: 4, label: "Pikes" , level: 1 }, 
    { id: "foo" , group: 4, label: "foo" , level: 1 }, 
    { id: "bar" , group: 4, label: "bar" , level: 1 } 
] 

var links = [ 
    { target: "mammal", source: "dog" , strength: 0.7 }, 
    { target: "mammal", source: "cat" , strength: 0.7 }, 
    { target: "mammal", source: "fox" , strength: 0.7 }, 
    { target: "mammal", source: "elk" , strength: 0.7 }, 
    { target: "insect", source: "ant" , strength: 0.7 }, 
    { target: "insect", source: "bee" , strength: 0.7 }, 
    { target: "fish" , source: "carp", strength: 0.7 }, 
    { target: "fish" , source: "pike", strength: 0.7 }, 
    { target: "cat" , source: "elk" , strength: 0.1 }, 
    { target: "carp" , source: "ant" , strength: 0.1 }, 
    { target: "elk" , source: "bee" , strength: 0.1 }, 
    { target: "dog" , source: "cat" , strength: 0.1 }, 
    { target: "fox" , source: "ant" , strength: 0.1 }, 
    { target: "pike" , source: "cat" , strength: 0.1 }, 
    { target: "foo" , source: "bar" , strength: 0.1 } 
] 



function getNodeColor(node, neighbors) { 
    return 'red' 
} 


function getLinkColor(node, link) { 
    return '000' 
} 

var width = window.innerWidth 
var height = window.innerHeight 

var svg = d3.select('svg') 
svg.attr('width', width).attr('height', height) 

// simulation setup with all forces 
var linkForce = d3 
    .forceLink() 
    .id(function (link) { return link.id }) 
    .strength(function (link) { return link.strength }) 

var simulation = d3 
    .forceSimulation() 
    .force('link', linkForce) 
    .force('charge', d3.forceManyBody().strength(-500).distanceMax(50)) 
    .force('center', d3.forceCenter(width/2, height/2)) 


var dragDrop = d3.drag().on('start', function (node) { 
    node.fx = node.x 
    node.fy = node.y 
}).on('drag', function (node) { 
    simulation.alphaTarget(0.7).restart() 
    node.fx = d3.event.x 
    node.fy = d3.event.y 
}).on('end', function (node) { 
    if (!d3.event.active) { 
    simulation.alphaTarget(0) 
    } 
    node.fx = null 
    node.fy = null 
}) 

var linkElements = svg.append("g") 
    .attr("class", "links") 
    .selectAll("line") 
    .data(links) 
    .enter().append("line") 
    .attr("stroke-width", 1) 
     .attr("stroke", "rgba(50, 50, 50, 0.2)") 

var nodeElements = svg.append("g") 
    .attr("class", "nodes") 
    .selectAll("circle") 
    .data(nodes) 
    .enter().append("circle") 
    .attr("r", 10) 
    .attr("fill", getNodeColor) 
    .call(dragDrop) 


simulation.nodes(nodes).on('tick',() => { 
    nodeElements 
    .attr('cx', function (node) { return node.x }) 
    .attr('cy', function (node) { return node.y }) 
    linkElements 
    .attr('x1', function (link) { return link.source.x }) 
    .attr('y1', function (link) { return link.source.y }) 
    .attr('x2', function (link) { return link.target.x }) 
    .attr('y2', function (link) { return link.target.y }) 
}) 

simulation.force("link").links(links) 

Answer 1

兩種行爲的預期。這是你能爲這些問題做什麼：

1. 網絡傳播開：我想你在談論的拖拽功能，因爲當加載模擬運行300只蜱。如果是這種情況，請使用simulation.alpha而不是simulation.alphaTarget。 simulation.alpha是控制熵的正確方法：

   simulation.alpha(0.7).restart(); 
   

2. 當你拖動一個網，人人網移動：那是因爲你使用d3.forceCenter()。根據API：

   定心力轉換節點均勻地使得所有節點平均位置（重心如果所有節點都具有相同的權重）是在給定位置。 （重點煤礦）

你可以做的是消除這種力量，當你拖動首次：

simulation.force("center", null) 

這是你的小提琴與這兩個變化：https://jsfiddle.net/yjkgdgad/