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了解 \resizebox 的缩放比例

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了解 \resizebox 的缩放比例

是否有可能知道\resizebox某物的规模以便在 a 中进一步使用\scalebox？

为了说明清楚，请看以下例子：

\documentclass{article}
\usepackage[paperwidth=12cm]{geometry}
\usepackage{graphicx}
\begin{document}
\def\figurea{\includegraphics[width=5cm]{example-image-a}}
\def\figureb{\includegraphics[width=2.5cm]{example-image-b}}
This is \texttt{fig-a} with its natural size:

\figurea
\bigskip

This is \texttt{fig-b} with its natural size:

\figureb
\bigskip

This is \texttt{fig-a} scaled to fit the page width:

\resizebox{\textwidth}{!}{\figurea}
\bigskip

How do I rescale \texttt{fig-b} to keep its relative size compared to \texttt{fig-a} without knowing its actual size?
\bigskip

\texttt{Insert a nice piece of code here :)}

\end{document}

我希望具有fig-b相同的相对大小，但fig-a实际上并不知道它们任何一个的大小。

另外，如示例中所示，图形之间会有文本，因此将它们放在同一位置\resizebox不是一个选择。

答案1

\resizebox只是\scalebox比例因子就是你要求的数字。所以你可以说服它显示该数字，而不是仅在本地组中使用它然后丢弃它。

在此处输入图片描述

\documentclass{article}
\usepackage[paperwidth=12cm]{geometry}
\usepackage{graphicx}
\makeatletter
\let\zz\Gscale@box
\long\def\Gscale@box#1{%
\xdef\thelastscalefactor{#1}%
\zz{#1}}

\makeatother
\begin{document}
\def\figurea{\includegraphics[width=5cm]{example-image-a}}
\def\figureb{\includegraphics[width=2.5cm]{example-image-b}}
This is \texttt{fig-a} with its natural size:

\figurea
\bigskip

This is \texttt{fig-b} with its natural size:

\figureb
\bigskip

This is \texttt{fig-a} scaled to fit the page width:

\noindent%you need this:-)
\resizebox{\textwidth}{!}{\figurea}
\let\savethis\thelastscalefactor
\bigskip

How do I rescale \texttt{fig-b} to keep its relative size compared to \texttt{fig-a} without knowing its actual size?
\bigskip

\noindent
\scalebox{\savethis}{\figureb}

\end{document}

答案2

这里我定义了\Resizebox，它是的变体，\resizebox接受一个可选参数；如果不存在，它的作用与相同\resizebox，如果存在，它应该是一个（可定义的）控制序列，其中存储比例因子，以供后续使用。

\documentclass{article}
\usepackage[paperheight=40cm,paperwidth=21cm]{geometry}
\usepackage{graphicx}
\usepackage{xfp}

\newcommand\figureA{\includegraphics[width=5cm]{example-image-a}}
\newcommand\figureB{\includegraphics[width=2.5cm]{example-image-b}}

\makeatletter
\newcommand{\Resizebox}[4][]{%
  \if\relax\detokenize{#1}\relax
    \resizebox{#2}{#3}{#4}%
  \else
    \begingroup
    \sbox0{#4}%
    \sbox2{\resizebox{#2}{#3}{#4}}%
    \@ifdefinable{#1}{\xdef#1{\fpeval{\wd2/\wd0}}}%
    \usebox{2}%
    \endgroup
  \fi
}
\makeatother

\begin{document}
\raggedright
This is \texttt{figure-a} with its natural size:

\figureA

\bigskip

This is \texttt{figure-b} with its natural size:

\figureB

\bigskip

This is \texttt{figure-a} scaled to fit the page width:

\Resizebox[\scaleforfigureA]{\textwidth}{!}{\figureA}

\bigskip

How do I rescale \texttt{figure-b} to keep its relative 
size compared to \texttt{figure-a} without knowing its actual size?

\bigskip

\texttt{Insert a nice piece of code here :)}

\scalebox{\scaleforfigureA}{\figureB}

\end{document}

在此处输入图片描述

答案3

您可以使用

\resizebox{\fpeval{(2.5cm) / (5cm)}\textwidth}{!}{\figureB}

其中\fpeval提供xfp。

\textwidth本质上，您是根据两个图形的宽度比将图像调整为缩放后的版本。在本例中，这是已知的，因此(2.5cm) / (5cm)除了使用之外，评估似乎是多余的.5。但一般来说，这可能是未知的。

下面的示例略有不同，用于2.5pc较小的图像：

在此处输入图片描述

\documentclass{article}

\usepackage[paperwidth=12cm]{geometry}
\usepackage{graphicx,xfp}

\setlength{\parindent}{0pt}% Just for this example

\begin{document}

\def\figureA{\includegraphics[width=5cm]{example-image-a}}
\def\figureB{\includegraphics[width=2.5pc]{example-image-b}}

This is \texttt{figureA} with its natural size:

\figureA
\bigskip

This is \texttt{figureB} with its natural size:

\figureB
\bigskip

This is \texttt{figureA} scaled to fit the page width:

\resizebox{\textwidth}{!}{\figureA}
\bigskip

How do I rescale \texttt{figureB} to keep its relative size compared to \texttt{figureA} without knowing its actual size?
\bigskip

\resizebox{\fpeval{(2.5pc) / (5cm)}\textwidth}{!}{\figureB}

\end{document}

您还可以使用

\resizebox{\fpeval{\textwidth * (2.5pc) / (5cm)}pt}{!}{\figureB}

\fpeval因为上维度的结果是用poin ts 来表示的。

如果图形尺寸未知，则可以将图形存储在盒子中，以便可以很容易地从中提取第wid个和/或heigh 个t。下面是考虑到这一点而编写的上述示例：

\documentclass{article}

\usepackage[paperwidth=12cm]{geometry}
\usepackage{graphicx,xfp}

\setlength{\parindent}{0pt}% Just for this example

\begin{document}

\newsavebox{\figureAbox}% Store figure a in a box
\savebox{\figureAbox}{\includegraphics[width=5cm]{example-image-a}}
\newsavebox{\figureBbox}% Store figure b in a box
\savebox{\figureBbox}{\includegraphics[width=2.5pc]{example-image-b}}

This is \texttt{figureA} with its natural size:

\usebox\figureAbox% figure a
\bigskip

This is \texttt{figureB} with its natural size:

\usebox\figureBbox% figure b
\bigskip

This is \texttt{figureA} scaled to fit the page width:

\resizebox{\textwidth}{!}{\usebox\figureAbox}% Scaled figure a
\bigskip

How do I rescale \texttt{figureB} to keep its relative size compared to \texttt{figureA} without knowing its actual size?
\bigskip

\resizebox{\fpeval{\textwidth * (\wd\figureBbox) / (\wd\figureAbox)}pt}{!}{\usebox\figureBbox}% Scaled figure b

\end{document}

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