文本的放置：这可行吗？

Question

只要指定文本开始的插入点，就可以将文本放置在页面的任何位置。

是否可以控制文本的位置，以便用户指定扩展的结束位置。

例如，在下面的代码中，是否可以这样放置文本，使得对于页面来说，文本从水平中心开始结束在文本框的最后一行末尾。在下面的草图中，粉红色区域表示文本应位于的位置。它从粉红色框的左上角开始，文本的最后一行是页面文本框的底部。（所以我不知道文本应该从哪里垂直开始；LaTeX 引擎或其他引擎应该计算这一点。

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass[10pt]{book}
\usepackage[
    showframe,%
    paperwidth=30pc,%
    paperheight=48pc,%
    margin=2pc,%
]{geometry}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[american]{babel}
\usepackage{microtype}
\usepackage{libertine}
\usepackage{lipsum}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\chapter{My chapter}

\lipsum[1]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Answer 1

我过去常常\vfill将它推到底部，\hfill将它推到右边，并将它放置在minipage对齐的[b]位置以产生所需的宽度。

\documentclass[10pt]{book}
\usepackage[
    showframe,%
    paperwidth=30pc,%
    paperheight=48pc,%
    margin=2pc,%
]{geometry}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[american]{babel}
\usepackage{microtype}
\usepackage{libertine}
\usepackage{lipsum}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\chapter{My chapter}
\vfill\hfill
\begin{minipage}[b]{.5\textwidth}
\lipsum[1]
\end{minipage}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}

Answer 2

解决方案如下eso-pic：

\documentclass[10pt]{book}
\usepackage[
    showframe,%
    paperwidth=30pc,%
    paperheight=48pc,%
    margin=2pc,%
]{geometry}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[american]{babel}
\usepackage{microtype}
\usepackage{libertine}
\usepackage{eso-pic, hanging} 
\usepackage{lipsum}

\begin{document}

\chapter{My chapter}
\hangpara{-0.52\textwidth}{6}
\lipsum[1]
 \AddToShipoutPictureFG*{\AtTextLowerLeft{\hspace*{0.5\linewidth}\parbox[b]{0.5\textwidth}{\color{red}\lipsum[1]}}}

\end{document}