如何使用 vis.js 强制边缘方向？

Question

我无法强制 vis 网络中的边缘进入一个方向。问题似乎是图书馆更喜欢层次结构中恰好 1 级长的边缘。

使用的布局代码：

layout: {
  hierarchical: {
    direction: "LR",
    sortMethod: 'directed'
  }
}

你可以在this JSFiddle或下面的图片中看到我的意思。

我希望节点 1 与 2 和 3 在同一行，导致短箭头指向 4，长箭头指向 6。相反，它现在将 1 放在 4 之后，导致边缘指向左侧.

Answer 1

请遵守以下代码。

您可以通过强制使用为每个节点定义的级别进行水平布局来实现此目的。

1 级：1、2、3 2级：4 3级：5 4级：6、7 5 级：8

等等...

const container = document.getElementById("mynetwork");
const nodes = new vis.DataSet([
    {
      id: 1,
      label: "1",
      level: 1
    },
    {
      id: 2,
      label: "2",
      level: 1
    },
    {
      id: 3,
      label: "3",
      level: 1
    },
    {
      id: 4,
      label: "4",
      level: 2
    },
    {
      id: 5,
      label: "5",
      level: 3
    },
    {
      id: 6,
      label: "6",
      level: 4
    },
    {
      id: 7,
      label: "7",
      level: 4
    },
    {
      id: 8,
      label: "8",
      level: 5
    }
  ]);

  const edges = new vis.DataSet([
    { from: 1, to: 4 },
    { from: 3, to: 4 },
    { from: 2, to: 4 },
    { from: 4, to: 5 },
    { from: 6, to: 8 },
    { from: 5, to: 7 },
    { from: 1, to: 6 },
    { from: 7, to: 8 }
  ]);
  const data = {
    nodes: nodes,
    edges: edges
  };
  const options = {
    nodes: {
      font: {
        size: 22
      },
    },
    edges: {
      font: {
        align: "top"
      },
      arrows: {
        to: { enabled: true, scaleFactor: 1, type: "arrow" }
      }
    },
    layout: {
   hierarchical: {
      enabled: true,
      levelSeparation: 200,
      nodeSpacing: 70,
      treeSpacing: 100,
      blockShifting: true,
      edgeMinimization: true,
      parentCentralization: true,
      direction: "LR", // UD, DU, LR, RL
      sortMethod: "hubsize", // hubsize, directed
    },
    },
    interaction: {
      tooltipDelay: 200,
      hover: true
    },
  };
   const network = new vis.Network(container, data, options);

#mynetwork {
  position: absolute;
  top: 0px; right: 0px; bottom: 0px; left: 0px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vis/4.21.0/vis.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/vis/4.21.0/vis.min.css" rel="stylesheet"/>

<div id="mynetwork">

</div>

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