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0.4.1 • Public • Published


This is the core package that fuels the iconic https://www.entitree.com website!

In a paper from 2013, A.J. van der Ploeg enhanced the Tidy Tree (Reingold-Tilford) algorithm to allow for variable-sized nodes, while keeping its linear runtime nature. He described the algorithm in his paper, Drawing Non-layered Tidy Trees in Linear Time. The author also provided a working Java application on GitHub at https://github.com/cwi-swat/non-layered-tidy-trees

This package take it to the next level by allowing also side nodes, very useful if you are drawing family trees and pedigrees.


Screenshot 2021-07-11 at 16 41 14

Screenshot 2021-07-11 at 16 40 53

Screenshot 2021-07-11 at 16 40 40

Screenshot 2021-07-11 at 16 40 17


npm i entitree-flex


yarn add entitree-flex

It does come with TS definitions

Usage from flat object

const { layoutFromMap } = require("entitree-flex")
import { layoutFromMap } from "entitree-flex"

const flatTree = {
  1: {
    name: "root",
    width: 14,
    children: [2, 3],
    parents: [7]
  2: { name: "child2" },
  3: { name: "child3", children: [4, 5], spouses: [6] },
  4: { name: "grandChild4" },
  5: { name: "grandChild5" },
  6: { name: "spouse of child 3" },
  7: { name: "parent of root" },

const { map, maxBottom, maxLeft, maxRight, maxTop, nodes, rels } = layoutFromMap(1, flatTree [, settings])


You can play live in your browser with random trees or make your own tree for testing.

Just run yarn browser and then open the file playground/index.html in your broser and see the results.

Edit the playground/source.js file to see changes.


Structure and defaults of the settings

defaultSettings = {
  clone: false, // returns a copy of the input, if your application does not allow editing the original object
  enableFlex: true, // has slightly better perfomance if turned off (node.width, node.height will not be read)
  firstDegreeSpacing: 15, // spacing in px between nodes belonging to the same source, eg children with same parent
  nextAfterAccessor: "spouses", // the side node prop used to go sideways, AFTER the current node
  nextAfterSpacing: 10, // the spacing of the "side" nodes AFTER the current node
  nextBeforeAccessor: "siblings", // the side node prop used to go sideways, BEFORE the current node
  nextBeforeSpacing: 10, // the spacing of the "side" nodes BEFORE the current node
  nodeHeight: 40, // default node height in px
  nodeWidth: 40, // default node width in px
  orientation: "vertical", // "vertical" to see parents top and children bottom, "horizontal" to see parents left and
  rootX: 0, // set root position if other than 0
  rootY: 0, // set root position if other than 0
  secondDegreeSpacing: 20, // spacing in px between nodes not belonging to same parent eg "cousin" nodes
  sourcesAccessor: "parents", // the prop used as the array of ancestors ids
  sourceTargetSpacing: 10, // the "vertical" spacing between nodes in vertical orientation, horizontal otherwise
  targetsAccessor: "children", // the prop used as the array of children ids

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GNU General Public License v3.0

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