Autoscale tikzpicture to maximum size possible on a page

Question

Is it possible to scale a tikz figure to the maximum size possible for the page with the text that is present on it using some parameters? For example, are there some parameters such that

\usepackage{float}
\usepackage{tikz, pgfplots} 

\begin{document}

\begin{figure}[H]
\begin{tikzpicture}[scale = **SOMETHING_HERE_TO_AUTO_SCALE_TO_MAX_SIZE_ON_PAGE?**]
% ... code to draw figure
\end{tikzpicture}
\end{figure}

\end{document}

The only way I have been achieving this is by trial and error.

By this I mean I try

\begin{figure}[H]
\begin{tikzpicture}[scale = 1]
% ... code to draw figure
\end{tikzpicture}
\end{figure}

It fits on the page so can I make it bigger? Try

\begin{figure}[H]
\begin{tikzpicture}[scale = 2]
% ... code to draw figure
\end{tikzpicture}
\end{figure}

It's too big, so I scale down

\begin{figure}[H]
\begin{tikzpicture}[scale = 1.5]
% ... code to draw figure
\end{tikzpicture}
\end{figure}

Ok it fits again. Can I make it bigger?

... etc.

Is there an easy way for latex to auto adjust the picture to the maximum size possible on the current page with all text, other figures etc. that are already present?

Answer 1

Inserted figure is "fixed" to some extent. So I do not use figure environment or other float environment.

The idea is simple: calculate the remaining height of the page

\dimexpr\pagegoal-\pagetotal-#1\relax

#1 is the reserved space for center environment and caption, 4\baselineskip by default.

Then fit the tikzpicture to the box of width \textwidth and height \dimexpr\pagegoal-\pagetotal-#1\relax.

• \getpicdimen is used to get the original size of the pic.
• \fittobox is used to fit the pic to box of fixed width and height.
• \fitremaining is used to fit the pic to the remaining space of the page.

\documentclass{article}
\usepackage{tikz}
\usepackage{caption}
\usepackage{showframe}
\usepackage{lipsum}
\usetikzlibrary{fit, calc, positioning}
\usepackage{xparse}

\renewcommand*\ShowFrameColor{\color{red}}

\NewDocumentCommand { \getpicdimen } { s O{\picwidth} O{\picheight} +m }
  {
    \begin{pgfinterruptboundingbox}
    \begin{scope}[local bounding box=pic, opacity=0]
      \IfBooleanTF {#1}
        { \node[inner sep=0pt, fit=(#4)] {}; }
        { #4 }
    \end{scope}
    \path ($(pic.north east)-(pic.south west)$);
    \end{pgfinterruptboundingbox}
    \pgfgetlastxy{#2}{#3}
  }

\ExplSyntaxOn
\fp_new:N \l__scale_fp
\NewDocumentCommand { \fittobox } { O{\picwidth} O{\picheight} m m D(){0, 0} +m }
  {
    \getpicdimen[#1][#2]{#6}
    \fp_compare:nTF
      {
        % pic ratio
        \dim_ratio:nn { #1 } { #2 } >
        % box ratio
        \dim_ratio:nn { #3 } { #4 }
      }
      { \fp_set:Nn \l__scale_fp { \dim_ratio:nn { #3 } { #1 } } }
      { \fp_set:Nn \l__scale_fp { \dim_ratio:nn { #4 } { #2 } } }
    \begin{scope}[
      shift={($(#5) - \fp_use:N \l__scale_fp*(pic.center)$)},
      scale=\fp_use:N \l__scale_fp,
      nodes={transform~shape},
      ]
      #6
    \end{scope}
  }

\NewDocumentCommand { \fitremaining } { O{ 4\baselineskip } +m }
  {
    \fittobox{\textwidth}{\dimexpr\pagegoal-\pagetotal-#1\relax}{#2}
  }
\ExplSyntaxOff

\begin{document}
\lipsum[1]
\begin{center}
\begin{tikzpicture}
\fitremaining{
  \draw (0, 0) node[left, draw] {$A$} -- (1, 1) node[right, draw] {$B$};
}
\end{tikzpicture}
\captionof{figure}{Test figure}
\end{center}

Some other text.
\clearpage

\lipsum[1-3]
\begin{center}
\begin{tikzpicture}
\fitremaining{
  \draw (0, 0) node[left, draw] {$A$} -- (1, 1) node[right, draw] {$B$};
}
\end{tikzpicture}
\captionof{figure}{Test figure}
\end{center}
\clearpage
\end{document}