determineLabelSize() {
    let width = 0;
    let height = 0;
    for (let k = 0; k < this.lines.length; k++) {
      const line = this.lines[k];

      if (line.width > width) {
        width = line.width;
      }
      height += line.height;
    }

    this.width = width;
    this.height = height;
  }
Determine the full size of the label text, as determined by current lines and blocks
@private