我正在尝试将文本放入overpic环境中的框中。kongo09 有类似的问题通过调整字体大小使文本适合给定的框，Werner 给出了一个非常可行的解决方案：
\documentclass{article}
\usepackage{environ}
\newdimen\fontdim
\newdimen\upperfontdim
\newdimen\lowerfontdim
\newif\ifmoreiterations
\fontdim12pt
\makeatletter
\NewEnviron{fitbox}[2]{% \begin{fitbox}{<width>}{<height>} stuff \end{fitbox}
\def\buildbox{%
\setbox0\vbox{\hbox{\minipage{#1}%
\fontsize{\fontdim}{1.2\fontdim}%
\selectfont%
\stuff%
\endminipage}}%
\dimen@\ht0
\advance\dimen@\dp0
}
\def\stuff{\BODY}% Store environment body
\buildbox
% Compute upper and lower bounds
\ifdim\dimen@>#2
\loop
\fontdim.5\fontdim % Reduce font size by half
\buildbox
\ifdim\dimen@>#2 \repeat
\lowerfontdim\fontdim
\upperfontdim2\fontdim
\fontdim1.5\fontdim
\else
\loop
\fontdim2\fontdim % Double font size
\buildbox
\ifdim\dimen@<#2 \repeat
\upperfontdim\fontdim
\lowerfontdim.5\fontdim
\fontdim.75\fontdim
\fi
% Now try to find the optimum size
\loop
%\message{Bounds: \the\lowerfontdim\space
% \the\fontdim\space \the\upperfontdim^^J}
\buildbox
\ifdim\dimen@>#2
\moreiterationstrue
\upperfontdim\fontdim
\advance\fontdim\lowerfontdim
\fontdim.5\fontdim
\else
\advance\dimen@-#2
\ifdim\dimen@<10pt
\lowerfontdim\fontdim
\advance\fontdim\upperfontdim
\fontdim.5\fontdim
\dimen@\upperfontdim
\advance\dimen@-\lowerfontdim
\ifdim\dimen@<.2pt
\moreiterationsfalse
\else
\moreiterationstrue
\fi
\else
\moreiterationsfalse
\fi
\fi
\ifmoreiterations \repeat
\box0% Typeset content
}
\makeatother
fitbox当然，定义的环境可以在overpic环境内部使用。附加
\usepackage[percent]{overpic}
\usepackage{lipsum}
\begin{document}
\begin{overpic}[width=.3\textwidth,grid,tics=10]{picfile}
\put(20,50) {% turns out not to be exactly the lower left
\begin{fitbox}{5cm}{1cm}% unhandy units - desired box size depends on picture size
\lipsum[1]%
\end{fitbox}%
}%
\end{overpic}
\end{document}
上面的代码基本上满足了我的要求。但是，(20,50) 不是左下角，也不是“cm”、“pts”等方便的单位。
是否可以修改上述代码，以便可以传递右上角的坐标而不是宽度和高度，并且 (20,50) 是左下角？
答案1
您所使用的宏的一个小缺陷是它们将文本放入minipage，这使得预测参考点最终会在哪里变得有些困难。
因此，首先更改 定义中的第一行fitbox，避免使用 ，因为minipage会弄乱垂直对齐（但是我们需要使用\hsize和 而不是\textwidth并且还设置\linewidth）：
\NewEnviron{fitbox}[2]{% \begin{fitbox}{<width>}{<height>} stuff \end{fitbox}
\def\buildbox{%
\setbox0\vbox{
\hsize#1\textwidth=\hsize\linewidth=\hsize
\parindent=0pt
\fontsize{\fontdim}{1.2\fontdim}\selectfont
\BODY\par}%
\dimen@\ht0
\advance\dimen@\dp0
}
\buildbox
% Compute upper and lower bounds
这样构建的框的参考点将位于左下方（准确地说，位于其中最后一行的基线）。
因此，您有办法准确放置盒子；例如
\documentclass{article}
\usepackage{graphicx}
\usepackage[percent]{overpic}
\usepackage{picture}
\begin{document}
\begin{overpic}[width=10cm,height=8cm,grid,tics=10]{filename}
\put(2.5cm,3.5cm){%
\begin{fitbox}{5cm}{1cm}%
Some text that will fit
Some text that will fit
Some text that will fit
Some text that will fit
\end{fitbox}%
}%
\end{overpic}
\end{document}
会将文本放置在图片的中心。
结果如下（使用draft选项graphicx使图片不可见）：
答案2
我会使用略有不同的方法，首先尝试将所有内容放入宏中并始终启用 cm 的使用。作为参考点，最好像普通绘图一样使用框的左下角（更容易记住和可视化）。
以下是 MWE：
\documentclass{article}
\usepackage{graphicx,environ}
\usepackage{overpic}
\usepackage{picture}
\usepackage{xcolor}
\def\sampletext{Some text that will fit
Some text that will fit
Some text that will fit
Some text that will fit.}
\fboxsep=0pt
\fboxrule=0pt
\begin{document}
% #1 x position
% #2 y position
% #3 width
% #4 height
% #5 graphics
\long\def\combo(#1,#2)#3#4#5#6{%
\begin{overpic}[width=#3, height=#4, grid,tics=10]{#5}
\parindent0pt
\put(#1,#2){%
\vbox{\leftskip5pt\rightskip5pt\hsize #3\color{white}\sffamily
#6\par}%
}%
\end{overpic}}
\combo(0cm,1cm){10cm}{8cm}{./graphics/cardtrick}{\large \sampletext}
\medskip
\combo(0cm,1cm){10cm}{8cm}{./graphics/cardtrick}{\Large\bfseries \sampletext}
\end{document}
理想情况下，这应该是一个键值宏。如果我正确理解了您的要求，请发表评论，我会将其扩展为键值答案。还请注意，我添加了 a\leftskip和 a\rightskip以允许一点填充。如果不需要，您可以将其归零。
更新后的版本
版本使用键值来精确定位、填充边框和通过调整字体大小，使文本适合一组给定的参数。
可以使用包和中的键值justified、raggedleft和来对齐文本。raggedrightragged2eRaggedLeftRaggedRight
经过一些调整的典型条目，
\combo[x=0pt,y=0pt,
padding-left=5pt,
padding-right=5pt,
text-color=yellow,
text-width=5cm,
text-height=5cm,
image-width=13cm,
image-height=9.5cm,
image-url=cardtrick,
tics, showframe=true,
]{\lipsum[2]}
下面是带有代码的 MWE，有点长，但我希望稍微完善一下，并创建一个合适的 |.dtx| 文件和包，我很快就会将其发布在 github 上。
\documentclass{article}
\usepackage[latin]{babel}
\usepackage{graphicx,lipsum}
\usepackage{overpic}
\usepackage{picture}
\usepackage{xcolor}
\usepackage{ragged2e}
\usepackage{combo}
\RequirePackage{pgf}[2008/01/15]
\fboxsep=0pt
\fboxrule=1pt
\makeatletter
% We use two boxes, one to store the contents of the text
% and another to store and measure the image
\newbox\textbox
% newif
\newif\if@ok
\@oktrue
\newif\ifshowframe
\newif\if@center
\newif\if@vcenter
% Step one define family
\pgfkeys{/combo/.is family}
% We store keys mostly in their own macros
\pgfkeys{/combo
% text positioning, reference is 0,0 at the left hand
% corner of the image
x/.store in=\position@x,
y/.store in=\position@y,
% text box padding
padding-left/.store in=\padding@left,
padding-left/.default=0pt,
padding-right/.store in=\padding@right,
padding-right/.default=0pt,
%
padding-bottom/.store in=\padding@bottom,
padding-bottom/.default=0pt,
%
padding-top/.store in=\padding@top,
padding-top/.default = 0pt,
% text coloring
text-color/.store in=\combo@textcolor,
text-color/.default=white,
% text width
text-width/.store in=\combo@textwidth,
text-width/.default=100pt,
text-height/.store in=\combo@textheight,
text-height/.default=5cm,
border-width/.store in=\combo@borderwidth,
border-color/.store in=\combo@bordercolor,
border-color/.default=red,
image-width/.store in=\combo@imgwidth,
image-width/.default=5cm,
image-height/.store in=\combo@imgheight,
image-height/.default=5cm,
image-url/.store in=\combo@imageurl,
% the file name for the graphic
image-url/.default=cardtrick,
tics/.store in=\combo@tics,
tics/.default=10,
showgrid/.store in=\combo@grid,
showgrid/.default ={,},
% define show frame key
showframe/.is if= showframe,
align/.is choice,
align/center/.code={\@centertrue},
align/vcenter/.code ={\@vcentertrue},
text-align/.store in = \combo@textalign,
border/.style={border-color=blue}
}
% Process keys and set defaults, for later use
\def\setdefaults{\pgfkeys{/combo
x=12pt,y=50pt,
padding-left,
padding-right,
padding-bottom,
text-align=raggedleft,
padding-top=0pt,
showgrid=grid,
}%
}
\setdefaults
% The approach we use is to have a set of predefined sizes
% to try out. If we cannot use any of these sizes, we fall back
% to scaling the fonts.
%
% We use a the list |\font@size@list| to hold all the allowable
% sizes for text. We also provide a command to add other sizes.
\newcommand{\font@size@list}{%
\Huge,\huge,
\LARGE,\Large
\large,\normalsize,
\small,\footnotesize,,
\scriptsize,\tiny%
}
% Author command holding default font size
% nothing else needed
\newcommand\default@fontsize{\small}
% Getter and setter for fontsize
% set@text@size
\def\set@text@size#1{%
\def\combo@text@size{#1}%
}
% we set default at \small
\set@text@size{\default@fontsize}
% holds the font details (Must add shape). Can be a bit automated
% as well
\newcommand\combo@inbox{}
% #2 x position of text block
% #3 y position
% #4 width
% #5 height
% #6 graphic
%
% We use pgf keys
\newcommand{\combo}[2][]{%
\setdefaults
\pgfkeys{/combo #1}
\def\combo@color{\color{\combo@textcolor}}
\def\combofont{%
\bfseries\rmfamily
\slshape\selectfont
\combo@text@size\combo@color
}%
% We store the contents of the text block in a
% box in order to measure the dimensions
\renewcommand{\combo@inbox}{%
\sbox\textbox{\par \vbox{%
\vskip\padding@top
\leftskip\padding@left%
\rightskip\padding@right%
\hsize \combo@textwidth%
\combofont%
\expandafter\csname\combo@textalign\endcsname
#2
\vskip\padding@bottom
\par
}%
}
}
\def\store@fontsize##1{%
\def\selected@fontsize{##1}}
% We iterate through all the size to get
% find an acceptable size that can fit in the box
\@for\next:=\font@size@list\do{%
\expandafter\set@text@size\next%
\next
% check and remeasure box
\combo@inbox
% \texttt{\expandafter\strip@prefix\meaning\next \the\ht\textbox}%
\if@ok
\ifdim\the\ht\textbox<\combo@textheight\relax
\@okfalse
%\fbox{\copy\textbox}\par%
\expandafter\store@fontsize\next
\fi
\fi
}
% if not found we have reached here with no solution
% better log an error and retry, by scaling the box
\if@ok\store@fontsize{\tiny} THIS IS IN ERROR \else \fi
\@oktrue
% We use the overpic package to set a backgroundgrid and
% to place the origin of the text box.
\vspace{1.5\baselineskip}
\centering
\begin{overpic}[width=\combo@imgwidth,
height=\combo@imgheight,
grid=\combo@grid,
tics=\combo@tics]{\combo@imageurl}%
\set@text@size\selected@fontsize
\combo@inbox
\put(\position@x,\the\dimexpr\position@y+\padding@bottom\relax){%
{\ifshowframe
\color{\combo@bordercolor}\fboxrule1pt\fbox{\copy\textbox}
\else
\color{red}\fboxrule0pt\fbox{\copy\textbox}
\fi
}%
}
\end{overpic}
}
\begin{document}
\combo[x=5pt,y=80pt,
padding-left=0pt,
padding-right=0pt,
padding-bottom=0pt,
text-color,
text-width=6cm,
text-height=5cm,
image-width=13cm,
image-height=7.5cm,
image-url=mandela,
tics,showframe=true,
border-color=yellow,
text-align=raggedright,
showframe=true,
showgrid=true,
border={border-color=blue}
]{Mandela has not made a public appearance since
the 2010 World Cup final in Johannesburg.}
\newpage
\combo[x=0pt,y=0pt,
padding-left=5pt,
padding-right=5pt,
text-color=yellow,
text-width=5cm,
text-height=5cm,
image-width=13cm,
image-height=9.5cm,
image-url=cardtrick,
tics, showframe=true,
]{\lipsum[2]}
\end{document}