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Excentric Labeling

Introduction

Excentric Labeling is a labeling technique, which is presented by Jean-Daniel Fekete and Catherine Plaisant in this paper. In this repository, we implement the layout algorithm about it.

demo

Live Demo

Installation

Browser

<script src="https://unpkg.com/excentric-labeling@3.0.2/dist/index.js"></script>

Then anywhere in your JavaScript code.

js const excentricLabeling = window.excentricLabeling

Via NPM

npm i excentric-labeling

Then anywhere in your code.

import excentricLabeling from "excentricLabeling"

OR

const excentricLabeling = require("excentric-labeling");

Usage

Example

import excentricLabeling from "excent";

declare const rawData: RawInfo[];
declare const x: number;
declare const y: number;

const computor: Computor = excentricLabeling();
computor.defaultLabelWidth(20)
    .defaultLabelHeight(5)
    .radius(10)

const result= computor(rawData, x, y)

Input

RawInfo[], the position of points. User can specify the width and/or height for the point. Otherwise, the algorithm will use the width and height from settings: computor.defaultLabelWidth(20), computor.defaultLabelHeight(10).

type RawInfo = {
    x: number,
    y: number,
    labelWidth?: number,
    labelHeight?: number,
    [redundantProp: string]: any,
};

Output:

The function will return LayoutInfo[]. For one LayoutInfo, it includes the necessaray infomation about one point in the visualization. Furthermore, it is sorted in ascending order by the distance from itself to the query point.

type LayoutInfo = {
    x: number,  // x coordinate of the point
    y: number,  // y coordinate of the point
    left: boolean,  // If true, the label of this point should be on the left of this point.
    controlPoints: {x: number, y: number}[],  // Control points of the line which connect point and label
    labelBBox: {  // The Bounding Box of label
        x: number,
        y: number,
        width: number,
        height: number
    },
    rawInfo: RawInfo  // The original input infomation of this point.
};

API

After the computor is created, users can configure it or get configuration information through the following API. If you provide no paramter, it will return the corresponding setting's value. Otherwise, it will set the corresponding setting's value with the given parameter, and return the computor itself to facilitate method chaining.

interface Computer {
    // if `isInfosFiltered` equals `false`, then computer will filter out the elements outside the lens
    (rawInfos: RawInfo[], cx: number, cy: number, isInfosFiltered?: boolean): LayoutInfo[];
    elementsInLens: (() => RawInfo[]);
    elementsNumInLens: (() => number);
    defaultLabelWidth: (() => number)
    & ((size: number) => Computer);
    defaultLabelHeight: (() => number)
    & ((size: number) => Computer);
    radius: (() => number)
    & ((radius: number) => Computer);
    maxLabelsNum: (() => number)
    & ((maxLabelsNum: number) => Computer);
    verticallyCoherent: (() => boolean)
    & ((verticallyCoherent: boolean) => Computer);
    horizontallyCoherent: (() => boolean)
    & ((horizontallyCoherent: boolean) => Computer);
    spaceBetweenLabels: (() => number)
    & ((spaceBetweenLabels: number) => Computer);
    leftSpace: (() => number)
    & ((space: number) => Computer);
    rightSpace: (() => number)
    & ((space: number) => Computer);
    leftAndRightSpace: (() => [number, number])
    & ((space: number) => Computer)
    & ((space: [number, number]) => Computer);
}

Notes

Be aware that the order will be changed