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+% \iffalse meta-comment
+%
+%% File: l3draw-boxes.dtx
+%
+% Copyright (C) 2018,2019 The LaTeX3 Project
+%
+% It may be distributed and/or modified under the conditions of the
+% LaTeX Project Public License (LPPL), either version 1.3c of this
+% license or (at your option) any later version. The latest version
+% of this license is in the file
+%
+% http://www.latex-project.org/lppl.txt
+%
+% This file is part of the "l3experimental bundle" (The Work in LPPL)
+% and all files in that bundle must be distributed together.
+%
+% -----------------------------------------------------------------------
+%
+% The development version of the bundle can be found at
+%
+% https://github.com/latex3/latex3
+%
+% for those people who are interested.
+%
+%<*driver>
+\RequirePackage{expl3}
+\documentclass[full]{l3doc}
+\begin{document}
+ \DocInput{\jobname.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% \title{^^A
+% The \pkg{l3draw-boxes} package\\ Boxes in drawings^^A
+% }
+%
+% \author{^^A
+% The \LaTeX3 Project\thanks
+% {^^A
+% E-mail:
+% \href{mailto:latex-team@latex-project.org}
+% {latex-team@latex-project.org}^^A
+% }^^A
+% }
+%
+% \date{Released 2019-08-25}
+%
+% \maketitle
+%
+% \begin{implementation}
+%
+% \section{\pkg{l3draw-boxes} implementation}
+%
+% \begin{macrocode}
+%<*initex|package>
+% \end{macrocode}
+%
+% \begin{macrocode}
+%<@@=draw>
+% \end{macrocode}
+%
+% Inserting boxes requires us to \enquote{interrupt} the drawing state,
+% so is closely linked to scoping. At the same time, there are a few
+% additional features required to make text work in a flexible way.
+%
+% \begin{variable}{\l_@@_tmp_box}
+% \begin{macrocode}
+\box_new:N \l_@@_tmp_box
+% \end{macrocode}
+% \end{variable}
+%
+% \begin{macro}{\draw_box_use:N}
+% \begin{macro}{\@@_box_use:Nnnnn}
+% Before inserting a box, we need to make sure that the bounding box is being
+% updated correctly. As drawings track transformations as a whole, rather
+% than as separate operations, we do the insertion using an almost-raw
+% matrix. The process is split into two so that coffins are also supported.
+% \begin{macrocode}
+\cs_new_protected:Npn \draw_box_use:N #1
+ {
+ \@@_box_use:Nnnnn #1
+ { 0pt } { -\box_dp:N #1 } { \box_wd:N #1 } { \box_ht:N #1 }
+ }
+\cs_new_protected:Npn \@@_box_use:Nnnnn #1#2#3#4#5
+ {
+ \bool_if:NT \l_draw_bb_update_bool
+ {
+ \@@_point_process:nn
+ { \@@_path_update_limits:nn }
+ { \draw_point_transform:n { #2 , #3 } }
+ \@@_point_process:nn
+ { \@@_path_update_limits:nn }
+ { \draw_point_transform:n { #4 , #3 } }
+ \@@_point_process:nn
+ { \@@_path_update_limits:nn }
+ { \draw_point_transform:n { #4 , #5 } }
+ \@@_point_process:nn
+ { \@@_path_update_limits:nn }
+ { \draw_point_transform:n { #2 , #5 } }
+ }
+ \group_begin:
+ \hbox_set:Nn \l_@@_tmp_box
+ {
+ \use:x
+ {
+ \@@_backend_box_use:Nnnnn #1
+ { \fp_use:N \l_@@_matrix_a_fp }
+ { \fp_use:N \l_@@_matrix_b_fp }
+ { \fp_use:N \l_@@_matrix_c_fp }
+ { \fp_use:N \l_@@_matrix_d_fp }
+ }
+ }
+ \hbox_set:Nn \l_@@_tmp_box
+ {
+ \tex_kern:D \l_@@_xshift_dim
+ \box_move_up:nn { \l_@@_yshift_dim }
+ { \box_use_drop:N \l_@@_tmp_box }
+ }
+ \box_set_ht:Nn \l_@@_tmp_box { 0pt }
+ \box_set_dp:Nn \l_@@_tmp_box { 0pt }
+ \box_set_wd:Nn \l_@@_tmp_box { 0pt }
+ \box_use_drop:N \l_@@_tmp_box
+ \group_end:
+ }
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\draw_coffin_use:Nnn}
+% Slightly more than a shortcut: we have to allow for the fact that coffins
+% have no apparent width before the reference point.
+% \begin{macrocode}
+\cs_new_protected:Npn \draw_coffin_use:Nnn #1#2#3
+ {
+ \group_begin:
+ \hbox_set:Nn \l_@@_tmp_box
+ { \coffin_typeset:Nnnnn #1 {#2} {#3} { 0pt } { 0pt } }
+ \@@_box_use:Nnnnn \l_@@_tmp_box
+ { \box_wd:N \l_@@_tmp_box - \coffin_wd:N #1 }
+ { -\box_dp:N \l_@@_tmp_box }
+ { \box_wd:N \l_@@_tmp_box }
+ { \box_ht:N \l_@@_tmp_box }
+ \group_end:
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+%</initex|package>
+% \end{macrocode}
+%
+% \end{implementation}
+%
+% \PrintIndex