Introduce inversion control keys

When using the four corner cells, the automatically detected inversion
may be horizontal and vertical whereas the user most likely only wants
one of them.

kvmap.dtx

 % \iffalse meta-comment
-% This is kvmap, (c) 2019 Ben Frank
+% This is kvmap, (c) 2020 Ben Frank
 %
 % It may be distributed and/or modified under the conditions of the
 % LaTeX Project Public License (LPPL), either version 1.3c of this
@@ -15,7 +15,7 @@
 \input l3docstrip.tex
 \askforoverwritefalse
 \preamble
-Copyright (C) 2019 Ben Frank
+Copyright (C) 2020 Ben Frank
 
 It may be distributed and/or modified under the conditions of
 the LaTeX Project Public License (LPPL), either version 1.3c of
@@ -102,7 +102,7 @@ End of file
 %<*pkg>
 %<@@=kvmap>
 \RequirePackage{expl3}
-\ProvidesExplPackage{kvmap}{2019/12/26}{0.3.2}{Drawing karnaugh maps with LaTeX}
+\ProvidesExplPackage{kvmap}{2020/03/27}{0.3.3}{Drawing karnaugh maps with LaTeX}
 %</pkg>
 % \fi
 %
@@ -212,6 +212,10 @@ End of file
 %				With |color| you may change the color of the border and |reducespace|
 %				allows you to specify whether you want the package to be narrower or wider.
 %				\par
+%				When using |invert|, the package tries to determine where to invert
+%				automatically. Sometimes it fails with the guesswork. You can manually
+%				disable the horizontal inversion part with |hinvert=false| (idem for the
+%				vertical inversion part with |vinvert=false|).\par
 %				Warning: This package is unable to draw a bundle including all four corners
 %				this way. If you need this specific edge case, please use TikZ to draw it
 %				yourself (see the last example in \autoref{sec:examples}).
@@ -447,7 +451,8 @@ End of file
 %		\subsection{Implicant-related code}
 % \begin{macro}[updated=2018-03-17]{\bundle}
 %		\changes{v0.1.1}{2018/03/17}{Correct dimensions}
-% 		\changes{v0.2.1}{2018/09/20}{Fix inversion}
+%		\changes{v0.2.1}{2018/09/20}{Fix inversion}
+%		\changes{v0.3.3}{2020/03/27}{Introduce hinvert and vinvert}
 %   Draw a bundle with given corners.
 %   \begin{arguments}
 %     \item key-value pairs
@@ -476,6 +481,18 @@ End of file
 		invert         .default:n      = true,
 		invert         .initial:n      = false,
 %    \end{macrocode}
+%		|vinvert|: perform inversion vertically
+%    \begin{macrocode}
+		vinvert        .bool_set:N     = \l_@@_bundle_vinvert_bool,
+		vinvert        .default:n      = true,
+		vinvert        .initial:n      = true,
+%    \end{macrocode}
+%		|hinvert|: perform inversion horizontally
+%    \begin{macrocode}
+		hinvert        .bool_set:N     = \l_@@_bundle_hinvert_bool,
+		hinvert        .default:n      = true,
+		hinvert        .initial:n      = true,
+%    \end{macrocode}
 %		|overlapmargins|: intrude into margin (when inverted)
 %    \begin{macrocode}
 		overlapmargins .dim_set:N      = \l_@@_bundle_overlapmargins_dim,
@@ -525,6 +542,7 @@ End of file
 					{
 						\int_compare_p:n { \l_@@_matrix_height_int - 1 = \l_@@_bundle_maxy_int }
 						&& \int_compare_p:n { 0 = \l_@@_bundle_miny_int }
+                                                && \l_@@_bundle_vinvert_bool
 					}
 					{
 						\draw[draw=\l_@@_bundle_color_tl,kvbundle] ~
@@ -569,6 +587,7 @@ End of file
 					{
 						\int_compare_p:n { \l_@@_matrix_width_int - 1 = \l_@@_bundle_maxx_int }
 						&& \int_compare_p:n { 0 = \l_@@_bundle_minx_int }
+                                                && \l_@@_bundle_hinvert_bool
 					}
 					{
 						\draw[draw=\l_@@_bundle_color_tl,kvbundle] ~

kvmap.ins

 \input l3docstrip.tex
 \askforoverwritefalse
 \preamble
-Copyright (C) 2019 Ben Frank
+Copyright (C) 2020 Ben Frank
 
 It may be distributed and/or modified under the conditions of
 the LaTeX Project Public License (LPPL), either version 1.3c of