svgdom/src/utils/PointCloud.js

Straightforward DOM implementation for SVG, HTML and XML

import { Box, NoBox } from '../other/Box.js'

export class PointCloud extends Array {
  constructor (...args) {
    if (args.length === 1 && typeof args[0] === 'number') {
      super(args.shift())
    } else {
      super()
    }

    // except multiple point arrays as input and merge them into one
    args.reduce((last, curr) => {
      last.push(...curr)
      return this
    }, this)
  }

  bbox () {
    if (!this.length) {
      return new NoBox()
    }

    let xMin = Infinity
    let xMax = -Infinity
    let yMin = Infinity
    let yMax = -Infinity

    this.forEach(function (p) {
      xMin = Math.min(xMin, p.x)
      xMax = Math.max(xMax, p.x)
      yMin = Math.min(yMin, p.y)
      yMax = Math.max(yMax, p.y)
    })

    return new Box(
      xMin, yMin,
      xMax - xMin,
      yMax - yMin
    )
  }

  merge (cloud) {
    return new PointCloud(this, cloud)
  }

  transform (m) {
    return new PointCloud(this.map((p) => p.transform(m)))
  }

}