Method fill

external/.scrollLibs.js:15582–15587

(fill = "")

    }
  }
  fill(fill = "") {
    this.topDownArray.forEach(line => {
      line.atoms.forEach((atom, index) => line.setAtom(index, fill))
    })
    return this
  }
  getAllAtomBoundaryCoordinates() {
    const coordinates = []
    let lineIndex = 0