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-% --------------------------------------------------------------------------
-%
-% the CHEMMACROS package -- module: `newman'
-%
-% --------------------------------------------------------------------------
-% 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--2020 Clemens Niederberger
-%
-% This work may be distributed and/or modified under the
-% conditions of the LaTeX Project Public License, either version 1.3c
-% 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 2008/05/04 or later.
-%
-% This work has the LPPL maintenance status `maintained'.
-%
-% The Current Maintainer of this work is Clemens Niederberger.
-% --------------------------------------------------------------------------
-\ChemModule{newman}{2016/04/23 newman projections}
-
-\chemmacros_load_module:n {tikz}
-
-% Newman projections
-\fp_new:N \l__chemmacros_newman_rel_angle_fp
-\fp_zero:N \l__chemmacros_newman_rel_angle_fp
-\fp_new:N \l__chemmacros_newman_tmp_angle_fp
-\fp_new:N \l__chemmacros_newman_abs_angle_fp
-\fp_zero:N \l__chemmacros_newman_abs_angle_fp
-\fp_new:N \l__chemmacros_newman_scale_fp
-\fp_set:Nn \l__chemmacros_newman_scale_fp {1}
-\fp_new:N \l__chemmacros_newman_x_fp
-\fp_new:N \l__chemmacros_newman_y_fp
-
-\tl_new:N \l__chemmacros_newman_tikz_ring_tl
-\tl_new:N \l__chemmacros_newman_tikz_front_tl
-\tl_new:N \l__chemmacros_newman_tikz_back_tl
-
-\bool_new:N \l__chemmacros_newman_tikz_back_bool
-
-\chemmacros_define_keys:nn {newman}
- {
- ring .tl_set:N = \l__chemmacros_newman_tikz_ring_tl ,
- atoms .tl_set:N = \l__chemmacros_newman_tikz_front_tl ,
- back-atoms .code:n =
- {
- \bool_set_true:N \l__chemmacros_newman_tikz_back_bool
- \tl_set:Nn \l__chemmacros_newman_tikz_back_tl { #1 }
- } ,
- scale .fp_set:N = \l__chemmacros_newman_scale_fp ,
- scale .default:n = 1 ,
- angle .fp_set:N = \l__chemmacros_newman_abs_angle_fp ,
- angle .default:n = 0
- }
-
-% \newman[<keyval>](<angle>){<1>,<2>,<3>,<4>,<5>,<6>}
-\NewDocumentCommand \newman {od()m}
- {
- \group_begin:
- \IfNoValueF {#1} { \chemmacros_set_keys:nn {newman} {#1} }
- \IfNoValueTF {#2}
- { \chemmacros_newman:nn { } {#3} }
- { \chemmacros_newman:nn {#2} {#3} }
- \group_end:
- }
-
-% #1: angle
-% #2: csv list of atoms
-\cs_new_protected:Npn \chemmacros_newman:nn #1#2
- { \__chemmacros_newman_feed_atoms:nw {#1}#2 ,,,,,, \q_stop }
-
-\cs_new_protected:Npn \__chemmacros_newman_feed_atoms:nw #1#2,#3,#4,#5,#6,#7,#8 \q_stop
- { \chemmacros_newman_atoms:nnnnnnn {#1} {#2} {#3} {#4} {#5} {#6} {#7} }
-
-% place atoms:
-% #1: angle
-% #2 - #7: atoms
-\cs_new_protected:Npn \chemmacros_newman_atoms:nnnnnnn #1#2#3#4#5#6#7
- {
- \tl_if_blank:nTF {#1}
- {
- \fp_set_eq:NN
- \l__chemmacros_newman_rel_angle_fp
- \l__chemmacros_newman_abs_angle_fp
- }
- { \fp_set:Nn \l__chemmacros_newman_rel_angle_fp {#1} }
- \chemmacros_tikz_picture:xn
- {
- scale = \fp_to_decimal:N \l__chemmacros_newman_scale_fp ,
- chemmacros_newman_atom_front / .style =
- {
- inner~sep = 0pt ,
- outer~sep = 0pt ,
- \exp_not:V \l__chemmacros_newman_tikz_front_tl
- },
- chemmacros_newman_atom_back / .style =
- {
- inner~sep = 0pt ,
- outer~sep = 0pt ,
- \bool_if:NTF \l__chemmacros_newman_tikz_back_bool
- { \exp_not:V \l__chemmacros_newman_tikz_back_tl }
- { \exp_not:V \l__chemmacros_newman_tikz_front_tl }
- }
- }
- {
- \chemmacros_tikz_draw:x
- { \exp_not:V \l__chemmacros_newman_tikz_ring_tl }
- (0pt,0pt) circle (\fp_to_dim:N \l__chemmacros_newman_scale_fp * 15) ;
- \chemmacros_newman_back_node:nn {30} {#6}
- \chemmacros_newman_back_node:nn {150} {#7}
- \chemmacros_newman_back_node:nn {270} {#5}
- \chemmacros_newman_front_node:nn {90} {#2}
- \chemmacros_newman_front_node:nn {210} {#3}
- \chemmacros_newman_front_node:nn {330} {#4}
- }
- }
-
-% provide cartesian coordiantes from polar coordinates
-% #1: fp variable for x
-% #2: fp variable for y
-% #3: angle
-% #4: radius
-\cs_new_protected:Npn \chemmacros_polar_to_cartesian:NNnn #1#2#3#4
- {
- \fp_set:Nn #1 { #4 * cos( #3 / 180 * pi ) }% x
- \fp_set:Nn #2 { #4 * sin( #3 / 180 * pi ) }% y
- }
-
-% place back nodes
-\cs_new_protected:Npn \chemmacros_newman_back_node:nn #1#2
- {
- \group_begin:
- \fp_add:Nn \l__chemmacros_newman_rel_angle_fp { #1 }
- \chemmacros_polar_to_cartesian:NNnn
- \l__chemmacros_newman_x_fp
- \l__chemmacros_newman_y_fp
- { \l__chemmacros_newman_rel_angle_fp }
- { \l__chemmacros_newman_scale_fp }
- \chemmacros_tikz_draw:x
- { \exp_not:V \l__chemmacros_newman_tikz_ring_tl }
- (
- 15 * \fp_to_dim:N \l__chemmacros_newman_x_fp ,
- 15 * \fp_to_dim:N \l__chemmacros_newman_y_fp
- )
- --
- (
- 30 * \fp_to_dim:N \l__chemmacros_newman_x_fp ,
- 30 * \fp_to_dim:N \l__chemmacros_newman_y_fp
- ) ;
- \chemmacros_polar_to_cartesian:NNnn
- \l__chemmacros_newman_x_fp
- \l__chemmacros_newman_y_fp
- { \l__chemmacros_newman_rel_angle_fp }
- { \l__chemmacros_newman_scale_fp }
- \chemmacros_tikz_node:x
- {
- chemmacros_newman_atom_back,
- anchor = -180 + \fp_to_int:N \l__chemmacros_newman_rel_angle_fp
- }
- at
- (
- 31 * \fp_to_dim:N \l__chemmacros_newman_x_fp ,
- 31 * \fp_to_dim:N \l__chemmacros_newman_y_fp
- )
- { #2 } ;
- \group_end:
- }
-\cs_generate_variant:Nn \chemmacros_newman_back_node:nn { nf }
-
-% place front nodes:
-\cs_new_protected:Npn \chemmacros_newman_front_node:nn #1#2
- {
- \chemmacros_polar_to_cartesian:NNnn
- \l__chemmacros_newman_x_fp
- \l__chemmacros_newman_y_fp
- { #1 }
- { \l__chemmacros_newman_scale_fp }
- \chemmacros_tikz_draw:x
- { \exp_not:V \l__chemmacros_newman_tikz_ring_tl }
- (0pt,0pt) -- ++
- (
- 30 * \fp_to_dim:N \l__chemmacros_newman_x_fp ,
- 30 * \fp_to_dim:N \l__chemmacros_newman_y_fp
- ) ;
- \chemmacros_polar_to_cartesian:NNnn
- \l__chemmacros_newman_x_fp
- \l__chemmacros_newman_y_fp
- { #1 }
- { \l__chemmacros_newman_scale_fp }
- \chemmacros_tikz_node:x
- { chemmacros_newman_atom_front, anchor = -180 + #1 }
- at
- (
- 31 * \fp_to_dim:N \l__chemmacros_newman_x_fp ,
- 31 * \fp_to_dim:N \l__chemmacros_newman_y_fp
- )
- { #2 } ;
- }
-\cs_generate_variant:Nn \chemmacros_newman_front_node:nn { nf }
-
-% --------------------------------------------------------------------------
-\file_input_stop:
-
-2016/04/23 - some changes on how \newman is processed internally