Method toggleLine

external/.scrollLibs.js:17417–17424

(line)

    return this.filter(particle => particle.getLine() === line)
  }
  toggleLine(line) {
    const lines = this.getParticlesByLine(line)
    if (lines.length) {
      lines.map(line => line.destroy())
      return this
    }
    return this.appendLine(line)
  }
  // todo: remove?
  sortByColumns(indexOrIndices) {
    const indices = indexOrIndices instanceof Array ? indexOrIndices : [indexOrIndices]