Prawn PDF中的左右拆分

Question

有些 PDF 的文本有些内容位于左侧，而其他部分位于右侧。是否可以让 Prawn 自动执行此操作，在左半部分填满后文本自动换行到页面的右半部分？

提供了一个示例图像：

Answer 1

这是免费摘自 Prawn 手册（最后更新：2019-06-09 - Prawn 版本：2.2.2）第 43 页：

require "prawn"

Prawn::Document.generate("prince.pdf") do

  column_box([0, cursor], columns: 2, width: bounds.width) do
    text 'The Prince',          align: :center, size: 18
    text 'Niccolo Machiavelli', align: :center, size: 14
    move_down 12
    text "All the States and Governments by which men are or ever have been ruled,
      have been and are either Republics or Princedoms. Princedoms are either
      hereditary, in which the sovereignty is derived through an ancient line
      of ancestors, or they are new. New Princedoms are either wholly new, as
      that of Milan to Francesco Sforza; or they are like limbs joined on to
      the hereditary possessions of the Prince who acquires them, as the
      Kingdom of Naples to the dominions of the King of Spain. The States thus
      acquired have either been used to live under a Prince or have been free;
      and he who acquires them does so either by his own arms or by the arms of
      others, and either by good fortune or by merit." * 10
  end
end