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+% --------------------------------------------------------------------------
+%
+% the CHEMMACROS package -- module: `tikz'
+%
+% --------------------------------------------------------------------------
+% Clemens Niederberger
+% --------------------------------------------------------------------------
+% https://github.org/cgnieder/chemmacros/
+% contact@mychemistry.eu
+% --------------------------------------------------------------------------
+% If you have any ideas, questions, suggestions or bugs to report, please
+% feel free to contact me.
+% --------------------------------------------------------------------------
+% Copyright 2011-2015 Clemens Niederberger
+%
+% This work may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+% http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2005/12/01 or later.
+%
+% This work has the LPPL maintenance status `maintained'.
+%
+% The Current Maintainer of this work is Clemens Niederberger.
+% --------------------------------------------------------------------------
+\ChemModule*{tikz}{2015/07/24 upright greek symbols}
+
+\RequirePackage{tikz}
+\usetikzlibrary{calc}%,arrows}
+
+\ExplSyntaxOn
+
+\tl_const:Nx \c_chemmacros_other_colon_tl { \token_to_str:N : }
+
+% --------------------------------------------------------------------------
+% TikZ drawings - helper macros
+\cs_new_protected:Npn \chemmacros_tikz_picture:nn #1#2
+ { \tikzpicture[{#1}] #2 \endtikzpicture }
+\cs_new_protected:Npn \chemmacros_tikz:nn #1#2 { \tikz[{#1}] {#2} }
+\cs_new_protected:Npn \chemmacros_tikz_draw:n #1 { \draw[{#1}] }
+\cs_new_protected:Npn \chemmacros_tikz_node:n #1 { \node[{#1}] }
+\cs_new_protected:Npn \chemmacros_tikz_shade:n #1 { \shade[{#1}] }
+\cs_new_protected:Npn \chemmacros_tikz_shadedraw:n #1 { \shadedraw[{#1}] }
+\cs_new_protected:Npn \chemmacros_tikz_node_in_draw:n #1 { node[{#1}] }
+
+\cs_generate_variant:Nn \chemmacros_tikz_picture:nn { xn }
+\cs_generate_variant:Nn \chemmacros_tikz_draw:n { x }
+\cs_generate_variant:Nn \chemmacros_tikz_node:n { x }
+\cs_generate_variant:Nn \chemmacros_tikz_shade:n { x }
+\cs_generate_variant:Nn \chemmacros_tikz_shadedraw:n { x }
+\cs_generate_variant:Nn \chemmacros_tikz_node_in_draw:n { x }
+
+% --------------------------------------------------------------------------
+% arrow tips for electron movement
+\dim_new:N \l__chemmacros_el_length_dim
+
+% full tip for pairs
+\pgfarrowsdeclare { el } { el }
+ {
+ \dim_set:Nn \l__chemmacros_el_length_dim
+ { 2.5pt + 2.5\pgflinewidth }
+ \pgfarrowsleftextend { -\l__chemmacros_el_length_dim }
+ \pgfarrowsrightextend { .5\pgflinewidth }
+ }
+ {
+ \dim_set:Nn \l__chemmacros_el_length_dim
+ { 2.5pt + 2.5\pgflinewidth }
+ \pgfsetdash {} { 0pt }
+ \pgfsetroundjoin
+ \pgfsetroundcap
+ \pgfpathmoveto { \pgfpoint { 0pt } { 0pt } }
+ \pgfpathlineto
+ {
+ \pgfpoint
+ { -\l__chemmacros_el_length_dim }
+ { .3\l__chemmacros_el_length_dim }
+ }
+ \pgfpathlineto
+ { \pgfpoint { -.5\l__chemmacros_el_length_dim } { 0pt } }
+ \pgfpathlineto
+ {
+ \pgfpoint
+ { -\l__chemmacros_el_length_dim }
+ { -.3\l__chemmacros_el_length_dim }
+ }
+ \pgfpathlineto { \pgfpoint { 0pt } { 0pt } }
+ \pgfusepathqfillstroke
+ }
+
+% half tip on the left
+\pgfarrowsdeclare { left~el } { left~el }
+ {
+ \dim_set:Nn \l__chemmacros_el_length_dim
+ { 2.5pt + 2.5\pgflinewidth }
+ \pgfarrowsleftextend { -\l__chemmacros_el_length_dim }
+ \pgfarrowsrightextend { .5\pgflinewidth }
+ }
+ {
+ \dim_set:Nn \l__chemmacros_el_length_dim
+ { 2.5pt + 2.5\pgflinewidth }
+ \pgfsetdash {} { 0pt }
+ \pgfsetroundjoin
+ \pgfsetroundcap
+ \pgfpathmoveto { \pgfpoint { 0pt } { 0pt } }
+ \pgfpathlineto
+ {
+ \pgfpoint
+ { -\l__chemmacros_el_length_dim }
+ { .3\l__chemmacros_el_length_dim }
+ }
+ \pgfpathlineto { \pgfpoint { -.5\l__chemmacros_el_length_dim } { 0pt } }
+ \pgfpathlineto { \pgfpoint { 0pt } { 0pt } }
+ \pgfusepathqfillstroke
+ }
+
+% half tip in the right
+\pgfarrowsdeclare { right~el } { right~el }
+ {
+ \dim_set:Nn \l__chemmacros_el_length_dim
+ { 2.5pt + 2.5\pgflinewidth }
+ \pgfarrowsleftextend { -\l__chemmacros_el_length_dim }
+ \pgfarrowsrightextend { .5\pgflinewidth }
+ }
+ {
+ \dim_set:Nn \l__chemmacros_el_length_dim
+ { 2.5pt + 2.5\pgflinewidth }
+ \pgfsetdash {} { 0pt }
+ \pgfsetroundjoin
+ \pgfsetroundcap
+ \pgfpathmoveto { \pgfpoint { 0pt } { 0pt } }
+ \pgfpathlineto
+ {
+ \pgfpoint
+ { -\l__chemmacros_el_length_dim }
+ { -.3\l__chemmacros_el_length_dim }
+ }
+ \pgfpathlineto { \pgfpoint { -.5\l__chemmacros_el_length_dim } { 0pt } }
+ \pgfpathlineto { \pgfpoint { 0pt } { 0pt } }
+ \pgfusepathqfillstroke
+ }
+% --------------------------------------------------------------------------