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% \iffalse meta-comment
%
%% File: l3draw-boxes.dtx
%
% Copyright (C) 2018-2020 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 2020-06-18}
%
% \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
|
