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%%
%% This is file `randomwalk.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% randomwalk.dtx (with options: `package')
%%
%% Do not distribute a modified version of this file.
%%
%% Communicate any suggestions for changing this package
%% to Bruno Le Floch (see the latex-randomwalk repository
%% on GitHub).
%%
%% File: randomwalk.dtx Copyright (C) 2011-2018 Bruno Le Floch
%%
%% 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
%%
%% This work has the LPPL maintenance status 'maintained'
%% and the current maintainer is Bruno Le Floch.
%%
%% This work consists of the files randomwalk.dtx and randomwalk.ins and
%% derived files randomwalk.sty and randomwalk.pdf.
%% -----------------------------------------------------------------------
\RequirePackage{expl3}[2017/11/14]
\ProvidesExplPackage
{randomwalk} {2018/12/28} {0.6} {Customizable random walks}
\RequirePackage{xparse}[2017/11/14]
\RequirePackage{pgfcore}
\int_const:Nn \c__randomwalk_lcg_last_int { \c_max_int - 1 }
\AtBeginDocument
{
\RequirePackage
[
first= 0 ,
last = \c__randomwalk_lcg_last_int ,
counter = lcg@rand
]
{ lcg }
\rand
}
\tl_new:N \l__randomwalk_internal_tl
\int_new:N \l__randomwalk_internal_int
\int_new:N \l__randomwalk_step_number_int
\bool_new:N \l__randomwalk_relative_angles_bool
\bool_new:N \l__randomwalk_degrees_bool
\bool_new:N \l__randomwalk_revert_random_bool
\cs_new_protected:Npn \__randomwalk_next_angle: { }
\cs_new_protected:Npn \__randomwalk_next_length: { }
\fp_new:N \l__randomwalk_angle_fp
\fp_new:N \l__randomwalk_length_fp
\dim_new:N \l__randomwalk_x_dim
\dim_new:N \l__randomwalk_y_dim
\seq_new:N \l__randomwalk_angles_seq
\seq_new:N \l__randomwalk_lengths_seq
\DeclareDocumentCommand \RandomWalk { m }
{ \randomwalk:n {#1} }
\cs_new_protected:Npn \randomwalk:n #1
{
\__randomwalk_setup_defaults:
\keys_set:nn { randomwalk } {#1}
\__randomwalk_walk:
}
\keys_define:nn { randomwalk }
{
number .value_required:n = true ,
length .value_required:n = true ,
angles .value_required:n = true ,
number .int_set:N = \l__randomwalk_step_number_int ,
length .code:n = { \__randomwalk_setup_length:n {#1} } ,
angles .code:n = { \__randomwalk_setup_angles:n {#1} } ,
degree .bool_set:N = \l__randomwalk_degrees_bool ,
degrees .bool_set:N = \l__randomwalk_degrees_bool ,
angles-relative .bool_set:N = \l__randomwalk_relative_angles_bool ,
revert-random .bool_set:N = \l__randomwalk_revert_random_bool ,
}
\cs_new_protected:Npn \__randomwalk_setup_defaults:
{
\int_set:Nn \l__randomwalk_step_number_int {10}
\cs_gset_protected:Npn \__randomwalk_next_angle:
{ \__randomwalk_fp_set_rand:Nnn \l__randomwalk_angle_fp { 0 } { 360 } }
\cs_gset_protected:Npn \__randomwalk_next_length:
{ \fp_set:Nn \l__randomwalk_length_fp {10} }
\bool_set_false:N \l__randomwalk_revert_random_bool
\bool_set_false:N \l__randomwalk_relative_angles_bool
\fp_zero:N \l__randomwalk_angle_fp
\fp_zero:N \l__randomwalk_length_fp
\dim_zero:N \l__randomwalk_x_dim
\dim_zero:N \l__randomwalk_y_dim
}
\cs_new_protected:Npn \__randomwalk_setup_length:n #1
{
\seq_set_split:Nnn \l__randomwalk_lengths_seq { , } {#1}
\seq_set_map:NNn \l__randomwalk_lengths_seq
\l__randomwalk_lengths_seq { \dim_to_fp:n {##1} }
\cs_gset_protected:Npn \__randomwalk_next_length:
{
\__randomwalk_get_rand_seq_item:NN
\l__randomwalk_lengths_seq \l__randomwalk_internal_tl
\fp_set:Nn \l__randomwalk_length_fp { \l__randomwalk_internal_tl }
}
}
\cs_new_protected:Npn \__randomwalk_setup_angles:n #1
{
\seq_set_split:Nnn \l__randomwalk_angles_seq { , } {#1}
\seq_set_map:NNn \l__randomwalk_angles_seq
\l__randomwalk_angles_seq { \fp_to_tl:n {##1} }
\cs_gset_protected:Npn \__randomwalk_next_angle:
{
\__randomwalk_get_rand_seq_item:NN
\l__randomwalk_angles_seq \l__randomwalk_internal_tl
\bool_if:NF \l__randomwalk_degrees_bool
{ \tl_put_right:Nn \l__randomwalk_internal_tl { rad } }
\bool_if:NTF \l__randomwalk_relative_angles_bool
{ \fp_add:Nn } { \fp_set:Nn }
\l__randomwalk_angle_fp { \l__randomwalk_internal_tl }
}
}
\cs_new_protected:Npn \__randomwalk_walk:
{
\__randomwalk_walk_start:
\prg_replicate:nn { \l__randomwalk_step_number_int }
{ \__randomwalk_walk_step: }
\bool_if:NF \l__randomwalk_revert_random_bool
{ \int_gset_eq:NN \cr@nd \cr@nd }
\__randomwalk_walk_stop:
}
\cs_new_protected:Npn \__randomwalk_walk_start:
{
\begin{pgfpicture}
\pgfpathmoveto
{ \pgfpoint { \l__randomwalk_x_dim } { \l__randomwalk_y_dim } }
}
\cs_new_protected:Npn \__randomwalk_walk_line:
{
\pgfpathlineto
{ \pgfpoint { \l__randomwalk_x_dim } { \l__randomwalk_y_dim } }
}
\cs_new_protected:Npn \__randomwalk_walk_stop:
{
\pgfusepath { stroke }
\end{pgfpicture}
}
\cs_new_protected:Npn \__randomwalk_walk_step:
{
\__randomwalk_next_length:
\__randomwalk_next_angle:
\dim_add:Nn \l__randomwalk_x_dim
{
\fp_to_dim:n
{ \l__randomwalk_length_fp * cosd ( \l__randomwalk_angle_fp ) }
}
\dim_add:Nn \l__randomwalk_y_dim
{
\fp_to_dim:n
{ \l__randomwalk_length_fp * sind ( \l__randomwalk_angle_fp ) }
}
\__randomwalk_walk_line:
}
\cs_new_protected:Npn \__randomwalk_fp_set_rand:Nnn #1#2#3
{
\rand
\fp_set:Nn #1
{ #2 + (#3 - (#2)) * \c@lcg@rand / \c__randomwalk_lcg_last_int }
}
\cs_new_protected:Npn \__randomwalk_get_rand_seq_item:NN #1#2
{
\int_set:Nn \l__randomwalk_internal_int { \seq_count:N #1 }
\int_compare:nTF { \l__randomwalk_internal_int = 1 }
{ \tl_set:Nx #2 { \seq_item:Nn #1 { 1 } } }
{
\rand
\tl_set:Nx #2
{
\seq_item:Nn #1
{
1 +
\int_mod:nn { \c@lcg@rand } { \l__randomwalk_internal_int }
}
}
}
}
%%
%%
%% End of file `randomwalk.sty'.
|
