SEECBC/FrontEnd/components/playground/gradient-descent/util.ts

import * as d3 from 'd3'

export class Player {
  private oneStep: () => void
  private timerIndex = 0

  constructor(oneStep: () => void) {
    this.oneStep = oneStep
  }

  pause() {
    this.timerIndex++
  }

  play() {
    this.start(this.timerIndex)
  }

  private start(localTimeIndex: number) {
    const timer = d3.timer(() => {
      if (localTimeIndex < this.timerIndex) {
        timer.stop()
      }
      this.oneStep()
    })
  }
}