#!/usr/bin/perl -w
# commitid.scad.pl - a program for annotating solid models with commit info
# Copyright (C)2016 Ian Jackson. See below. There is NO WARRANTY.
# USAGE
# =====
#
# .../commitid.scad.pl [OPTION...] [STRING...] >commitid.scad.new \
# && mv -f commitid.scad.new commitid.scad
#
# Run without arguments, commitid.scad.pl will output an openscad file
# which contains 2D and 3D models of the current git commit count and
# commit object id (commit hash), useful for identifying printed
# parts.
#
# See below for details. You probably want these two sections, as a
# quick starting point:
# General form of provided openscad modules
# Autoscaling modules
#
# We can also generate models of short mainly-numeric strings
# specified on the command line.
#
#
# Options:
#
# --git Generate git commit indications, as shown below
# (this is the default if no strings are requested with -t).
# Ie, produce the `Autoscaling modules' and `Specific layouts'.
#
# --git=objid
# Generate git commit indication based on commit object only
# (ie avoid counting commits). Ie, do not generate `Small'
# and `Full' layouts (and never select them for `Best').
#
# -i Do not generate `+' dirty indication if git-untracked files
# are present (ie, missing .gitignore entries). The `*'
# dirty tree indication (for modified files) cannot be disabled.
#
# [-t[LAYOUT]] TEXT
# Generate a layout LAYOUT containing TEXT. TEXT can
# contain newlines (a final newline usually undesirable, as
# it will generate a blank line). If LAYOUT is not specified,
# generates Arg0, Arg1, Arg2, etc., for successive such
# TEXTs. The permissible character set in is TEXT is:
# space 0-9 a-f + *
#
#
# OPENSCAD INTERFACE
# ==================
#
# Dynamic variables for configuration
# -----------------------------------
#
# We honour the following variables to control various scaling factors:
#
# default value notes
# $Commitid_pixelsz 0.8 \ multiplied together
# $Commitid_scale 1.0 /
# $Commitid_depth pixelsz/2 \ multiplied together
# $Commitid_depth_scale 1.0 /
# $Commitid_max_best_scale 2.0 limits XY scaling in *Best*
#
# FYI the font is nominally 3x5 pixels, with 1-pixel inter-line and
# inter-character gaps. (It's not strictly speaking a 3x5 bitmap
# font, size it contains partial pixels and diagonals.)
#
#
# Non-`module'-specific functions
# -------------------------------
#
# We provide the following functions (which depend on the config
# variables, but not on anything else) and compute useful values:
#
# function Commitid_pixelsz() Actual size of each nominal pixel
# function Commitid_depth() Depth to use (the amount characters
# should be raised or sunken)
#
# General form of provided openscad modules
# -----------------------------------------
#
# module Commitid_MODULE_2D(...) Collection of polygons forming characters
# module Commitid_MODULE(...) The above, extruded up and down in Z
# module Commitid_MODULE_M_2D(...) Mirror writing
# module Commitid_MODULE_M(...) 3D mirror writing
# function Commitid_MODULE_sz() A 2-vector giving the X,Y size
#
# Except for *Best* modules, the XY origin is in the bottom left
# corner without any margin. Likewise Commitid_MODULE_sz does not
# include any margin.
#
# For 3D versions, the model is 2*depth deep and the XY plane bisects
# the model. This means it's convenient to either add or subtract from
# a workpiece whose face is in the XY plane.
#
# The _M versions are provided to avoid doing inconvenient translation
# and rotation to get the flipped version in the right place.
#
#
# Autoscaling modules
# -------------------
#
# These modules take a specification of the available XY space, and
# select and generate a suitable specific identification layout:
#
# module Commitid_BestCount_2D (max_sz, margin=Commitid_pixelsz())
# module Commitid_BestCount (max_sz, margin=Commitid_pixelsz())
# module Commitid_BestCount_M_2D(max_sz, margin=Commitid_pixelsz())
# module Commitid_BestCount_M (max_sz, margin=Commitid_pixelsz())
# module Commitid_BestObjid_2D (max_sz, margin=Commitid_pixelsz())
# module Commitid_BestObjid (max_sz, margin=Commitid_pixelsz())
# module Commitid_BestObjid_M_2D(max_sz, margin=Commitid_pixelsz())
# module Commitid_BestObjid_M (max_sz, margin=Commitid_pixelsz())
#
# max_sz should be [x,y].
#
# BestCount includes (as much as it can of) the git commit count,
# ie the result of
# git rev-list --first-parent --count HEAD
# (and it may include some of the git revision ID too).
#
# BestObjid includes as much as it can of the git commit object hash,
# and never includes any of the count.
#
# All of these will autoscale and autorotate the selected model, and
# will include an internal margin of the specified size (by default,
# one pixel around each edge). If no margin is needed, pass margin=0.
#
# There are no `function Commitid_Best*_sz'. If they existed they
# would simply return max_sz.
#
#
# Output format
# -------------
#
# In general the output, although it may be over multiple lines,
# is always in this order
# git commit object id (hash)
# dirty indicator
# git commit count
#
# Not all layouts have all these parts. The commit object id may
# sometimes be split over multiple lines, but the count will not be.
# If both commit id and commit count appear they will be separated
# by (at least) a newline, or a dirty indicator, or a space.
#
# The commit id is truncated to fit, from the right.
#
# The commit count is truncated from the _left_, leaving the least
# significant decimal digits.
#
# The dirty indicator can be
#
# * meaning the working tree contains differences from HEAD
#
# + meaning the working tree contains untracked files
# (ie files you have failed to `git add' and also failed
# to add to gitignore). (But see the -i option.)
#
#
# Specific layouts
# ----------------
#
# If you want to control the exact layout (and make space for it in
# your design), you can use these:
#
# module Commitid_LAYOUT_2D()
# module Commitid_LAYOUT()
# module Commitid_LAYOUT_M_2D()
# module Commitid_LAYOUT_M()
# function Commitid_LAYOUT_sz()
#
# Here LAYOUT is one of the following (giving for example, `module
# Commitid_Full8_2D'). In the examples, we will assume that the tree
# is dirty, the commit count is 123456, and the commit object id
# starts abcdeffedbcaabcdef... In the examples `_' shows where a
# space would be printed.
#
# Small2 Small3 ... Small9 Small10 Small12 Small14 Small16
# A single line containing as much of the count will fit, eg:
# Small5 3456*
# Small8 _*123456
# The objectid is included if more than one character of of it
# will fit without makign the output ambiguous:
# Small9 ab*123456
#
# Small2S Small4S ... Small16S
# Small3T Small9T Small12T
# Same as Small but split into two lines (S)
# or three lines (T). Eg:
# Small4S *4 Small6T _*
# 56 34
# 56
# Git2 Git3 ... Git9 Git10 Git12 Git14 Git16
# Git4S Git6S ... Git16S
# Git6T Git9T Git12T
# Just the commit object hash, in one, two (S) or three (T)
# lines. E.g.:
# Git5 abcd*
#
# Full4 Full6 ... Full20:
# The commit object hash plus the commit count, on
# separate lines, eg:
# Full12 abcdef Full16 abcdeffe
# *23456 _*123456
#
# Full6T Full9T ... Full30T
# As Full but the commit object id is split over two lines
# producing a 3-line layout, eg:
# Full9T abc Full21T abcdeff
# de* edbcaa*
# 456 _123456
#
# Other LAYOUTs
# -------------
#
# FontDemo
#
# A demonstration of the built-in 18-character font
#
# Arg0 Arg1, ...
#
# Strings passed on command line (without -t, or bare -t,
# rather than with -tLAYOUT).
#
# LAYOUT
#
# Generated by passing -tLAYOUT on the command line.
#
# COPYRIGHT, LICENCE AND LACK-OF-WARRANTY INFORMATION
# ===================================================
#
# This program is Free Software and a Free Cultural Work.
#
# You can redistribute it and/or modify it under the terms of the
# GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see .
#
# Alternatively, at your option:
#
# This work is licensed under the Creative Commons
# Attribution-ShareAlike 4.0 International License.
#
# There is NO WARRANTY.
use strict;
$SIG{__WARN__} = sub { die @_; };
our $debug=0;
if (@ARGV && $ARGV[0] =~ m/^-(D+)$/) {
$debug = length $1;
shift @ARGV;
}
sub p { print @_ or die $!; }
sub p_debug { print STDERR @_ if $debug; }
p <<'END';
// *** AUTOGENERATED - DO NOT EDIT *** //
function Commitid_pixelsz() =
($Commitid_pixelsz ? $Commitid_pixelsz : 0.8) *
($Commitid_scale ? $Commitid_scale : 1.0);
function Commitid_depth() =
($Commitid_depth ? $Commitid_depth : Commitid_pixelsz()/2) *
($Commitid_depth_scale ? $Commitid_depth_scale : 1.0);
function Commitid__scale() =
Commitid_pixelsz() / 0.2;
END
sub chrmodname ($) {
my ($chr) = @_;
my $chrx = sprintf '%#x', ord $chr;
return "Commitid__chr_$chrx";
}
our $gtm_demo_i = -1;
our $gtm_demo_j;
our @gtm_demo_o;
sub gentextmodule_demo_start_batch () {
$gtm_demo_j = 0;
$gtm_demo_i++;
}
sub argl_formal (@) { join ', ', @_; }
sub argl_actual (@) { join ',', map { m/=/ ? $` : $_ } @_; }
sub gen3dmodule ($@) {
my ($modb,$size,@argl) = (@_);
$size ||= "${modb}_sz()";
p "module ${modb}_M_2D(".argl_formal(@argl)."){\n";
p " translate([${size}[0],0])\n";
p " mirror([1,0,0])\n";
p " ${modb}_2D(".argl_actual(@argl).");\n";
p "};\n";
foreach my $mir ('','_M') {
my $mm = "${modb}${mir}";
p "module ${mm}(".argl_formal(@argl)."){\n";
p " d=Commitid_depth();\n";
p " translate([0,0,-d]) linear_extrude(height=d*2)\n";
p " ${mm}_2D(".argl_actual(@argl).");\n";
p "}\n";
}
}
sub gentextmodule ($@) {
my ($form, @lines) = @_;
my $modb = "Commitid_$form";
p "module ${modb}_2D(){\n";
p " // |$_|\n" foreach @lines;
p " scale(Commitid__scale()){\n";
my $y = @lines;
my $cols = 1;
foreach my $line (@lines) {
$y--;
my $x = 0;
foreach my $chr (split //, $line) {
p sprintf " translate([%d * 0.8, %d * 1.2]) %s();\n",
$x, $y, chrmodname $chr
if $chr =~ m/\S/;
$x++;
}
$cols = $x if $x > $cols;
}
p " }\n";
p "}\n";
gen3dmodule($modb,'');
p sprintf "function %s_sz() = Commitid__scale() * 0.1 * [ %d, %d ];\n",
$modb, 2 * ($cols * 4 - 1), 2 * (@lines * 6 - 1);
push @gtm_demo_o, <commitid-DEBUG-simplify-$chr.ps";
print S "%!\n";
print S "(Courier-Bold) findfont 15 scalefont setfont\n";
$prcount=0;
}
sub debug_simplify_done () {
return unless $debug;
print S "showpage\n";
close S or die $!;
}
sub debug_simplify_pr ($$$) {
my ($chr,$polys,$why) = @_;
return unless $debug;
print STDERR "PR $chr $why\n";
my $ct_x = 10000 * ($prcount % 6);
my $ct_y = 18000 * int($prcount / 6);
printf S "0 setgray\n";
printf S "%d %d moveto\n", map {$_/100 + 10} $ct_x,$ct_y;
printf S "(%s) show\n", $why;
my $pr_recur;
$pr_recur = sub {
my ($tpolys, @levels) = @_;
return unless @$tpolys;
foreach my $i (0..$#$tpolys) {
printf STDERR "P@levels %02d :", $i;
my $pinfo = $tpolys->[$i];
my $p = $pinfo->{E};
printf STDERR "@$p\n";
my $lw = 5 - 4*($i / ($#$tpolys || 1));
my $pp = sub {
my $spec = $p->[$_[0]];
$spec =~ m/^\d{5}/;
sprintf "%d %d",map { $_/100 }
1000 + $ct_x + $&,
5000 + $ct_y + $';
};
printf S "%s setrgbcolor\n", (@levels==0 ? '0 0 0' :
@levels==1 ? '0 0 1'
: '1 1 0');
foreach my $eai (0..$#$p) {
my $ebi = ($eai + 1) % @$p;
printf S <($eai), $pp->($ebi);
%f setlinewidth
%s moveto
%s lineto
stroke
END
}
$pr_recur->($pinfo->{Holes}, @levels, $i);
}
};
$pr_recur->($polys,0);
$prcount++;
}
sub simplify ($$) {
my ($chr,$polys) = @_;
use Data::Dumper;
return unless @$polys;
my $count=0;
my $pr = sub { };
if ($debug) {
debug_simplify_begin($chr);
}
$pr->("start");
AGAIN: while(1) {
my %edges;
my $found_hole;
foreach my $pi (0..$#$polys) {
my $p = $polys->[$pi]{E};
foreach my $ei (0..$#$p) {
my $e = $p->[$ei].$p->[($ei+1) % @$p];
die if $edges{$e};
$edges{$e} = [ $p, $pi, $ei ];
}
}
p_debug "AGAIN $count\n";
my $merge = sub {
my ($pa, $pai, $eai, $pb, $pbi, $ebi) = @_;
p_debug "# merging $pai:$eai.. $pbi:$ebi..\n";
splice @$pa, $eai, 1,
((@$pb)[$ebi+1..$#$pb], (@$pb)[0..$ebi-1]);
@$pb = ( );
};
foreach my $pai (0..$#$polys) {
my $painfo = $polys->[$pai];
my $pa = $painfo->{E};
foreach my $eai (0..$#$pa) {
my $ear = $pa->[ ($eai+1) % @$pa ].$pa->[$eai];
my $ebi = $edges{$ear};
next unless $ebi;
my ($pb,$pbi);
($pb, $pbi, $ebi) = @$ebi;
# $pai:($eai+1)..$eai and $pbi:$ebi..($ebi+1) are identical
# so we want to remove them.
if ($pai==$pbi) {
# we're making a hole! we make an assumption:
# holes have fewer line segments than the
# outlines. This is almost always true because of
# the way we construct our figures.
if (($ebi - $eai + @$pa) % @$pa > @$pa/2) {
# We arrange that $eai..$ebi is the hole
($ebi,$eai) = ($eai,$ebi);
}
p_debug "HOLE $eai $ebi\n";
# we want to make the smallest hole, to avoid
# making a hole that itself needs simplifying
my $holesz = ($ebi - $eai + @$pa) % @$pa;
$found_hole = [ $pa,$pai,$eai, $ebi, $holesz ]
unless $found_hole && $found_hole->[4] < $holesz;
} else {
$merge->($pa,$pai,$eai,$pb,$pbi,$ebi);
debug_simplify_pr($chr,$polys,"after $count");
next AGAIN;
}
}
# we process hole joining last, so that the whole of the
# edge of the hole must be part of the same polygon
if ($found_hole) {
p_debug "HOLE DOING @$found_hole\n";
my ($pa,$pai,$eai,$ebi) = @$found_hole;
# simplify the indexing
@$pa = ((@$pa)[$eai..$#$pa], (@$pa)[0..$eai-1]);
$ebi -= $eai; $ebi += @$pa; $ebi %= @$pa;
$eai = 0;
push @{ $painfo->{Holes} }, {
E => [ (@$pa)[$eai+1..$ebi-1] ],
Holes => [ ],
};
splice @$pa, $eai, $ebi-$eai+1;
debug_simplify_pr($chr,$polys,"hole $count");
next AGAIN;
}
}
last;
}
debug_simplify_done();
}
sub p_edgelist ($$$) {
my ($points,$vecs,$p) = @_;
my @vec;
foreach my $pt (@$p) {
$pt =~ s{\d{5}}{$&,};
$pt =~ s{\b\d}{$&.}g;
push @$points, "[$pt]";
push @vec, $#$points;
}
push @$vecs, \@vec;
}
sub parsefont () {
my %cellmap;
for (;;) {
$_ = // die;
last if %cellmap && !m/\S/;
next unless m/\S/;
chomp;
s{^(.) }{};
$cellmap{$1} = $_;
}
my %chrpolys;
# $chrs{$chr}[$poly] = $poly
# $poly->{E} = [ "012345012345", ... ]
# $poly->{Holes} = $poly2
while () {
next unless m/\S/;
chomp;
my @chrs = split / /, $_;
!~ m/\S/ or die;
foreach my $row (reverse 0..4) {
$_ = ;
chomp;
s{^}{ };
$_ .= ' ' x 8;
m{\S/\S} and die;
s{/(?=\s)}{L}g;
s{/(?=\S)}{r}g;
s{\\(?=\s)}{l}g;
s{\\(?=\S)}{R}g;
p "// $_\n";
foreach my $chr (@chrs) {
s{^ }{} or die "$chr $_ ?";
foreach my $col (0..2) {
my @verts;
if (s{^ }{}) {
} elsif (s{^\S}{}) {
my $f = $cellmap{$&};
die unless $f;
$f =~ s/\b\d/ sprintf '%05d', $col*2000 + $&*1000 /ge;
$f =~ s/\d\b/ sprintf '%05d', $row*2000 + $&*1000 /ge;
push @{ $chrpolys{$chr} }, { E => [ split / /, $f ] };
} else {
die "$_ ?";
}
}
}
die "$_ ?" if m{\S};
}
}
my $demo = '';
my $democols = 6;
foreach my $chr (sort keys %chrpolys) {
my $polys = $chrpolys{$chr};
$_->{Holes} = [] foreach @$polys;
simplify($chr,$polys);
my $mod = chrmodname $chr;
p "module $mod () {\n";
foreach my $poly (@$polys) {
p " polygon(";
my $holes = $poly->{Holes};
my (@points, @vecs);
p_edgelist(\@points, \@vecs, $poly->{E});
foreach my $hole (@$holes) {
p_edgelist(\@points, \@vecs, $hole->{E});
}
p "points=[".(join ",",@points)."],";
if (@$holes) {
p ",paths=[".(join ",",
map { "[".(join ",",@$_)."]" }
@vecs)."],";
}
p "convexity=4);\n";
}
p "}\n";
$demo .= $chr;
}
@demo = reverse $demo =~ m{.{1,$democols}}go;
}
parsefont();
our $do_git; # contains may chars 'c' (count) and/or 'o' (object)
our $do_git_untracked = 1;
our $argcounter;
our @forms;
our %included; # 0 = not at all; 1 = truncated; 2 = full
sub rjustt ($$$;$) {
# right justify and truncate (ie, pad and truncate at left)
# always includes prefix
# sets $included{$what}
my ($sz, $what, $whole, $prefix) = @_;
$prefix //= '';
my $lw = length $whole;
my $spare = $sz - $lw - (length $prefix);
$included{$what}= 1 + ($spare > 0);
return
($spare > 0 ? (' ' x $spare) : '').
$prefix.
substr($whole, ($spare < 0 ? -$spare : 0));
}
sub ljustt ($$$;$) {
my ($sz, $what, $whole, $suffix) = @_;
$suffix //= '';
$sz -= length $suffix;
$included{$what} = 1 + ($sz >= length $whole);
return sprintf "%-${sz}.${sz}s%s", $whole, $suffix;
}
sub genform_prep() {
$included{$_}=0 foreach qw(Objid Count);
}
sub genform ($@) {
my ($form, @lines) = @_;
gentextmodule($form, @lines);
my $f = {
Form => $form,
Chars => (length join '', @lines),
Lines => (scalar @lines),
Ambiguous => ($form =~ m/Full/ && !grep { m/\W/ } @lines),
Included => { %included },
};
push @forms, $f;
}
sub genform_q ($$$) {
my ($form, $s, $lines) = @_;
$gtm_demo_j++;
my $l = length $s;
return if $l % $lines;
my $e = $l/$lines;
return if $e < 2;
$gtm_demo_j--;
genform($form, $s =~ m/.{$e}/g);
}
sub genform_plusq ($$) {
my ($form, $s) = @_;
genform($form, $s);
genform_q("${form}S", $s, 2);
genform_q("${form}T", $s, 3);
}
our @gcmd;
sub gitrun_start () {
open F, "-|", @gcmd or die "$gcmd[0]: start: $!";
}
sub gitrun_done (;$) {
my ($errok) = @_;
$?=0; $!=0;
return if close F;
return if $errok;
die $! if $!;
die "@gcmd failed ($?)\n";
}
sub gitoutput (@) {
(@gcmd) = (qw(git), @_);
gitrun_start;
$_ = ;
gitrun_done;
defined or die "@gcmd produced no output";
chomp or die "@gcmd produced no final newline";
$_;
}
sub do_git () {
return unless $do_git;
@gcmd = qw(git status --porcelain);
push @gcmd, qw(--untracked=no) unless $do_git_untracked;
my $git_dirty = '';
gitrun_start;
while () {
if (m/^\?\?/ && $do_git_untracked) {
$git_dirty = '+';
next;
}
$git_dirty = '*';
last;
}
gitrun_done($git_dirty eq '*');
my $git_count;
my $git_object;
if ($do_git =~ m/c/) {
$git_count = gitoutput qw(rev-list --first-parent --count HEAD);
}
if ($do_git =~ m/o/) {
$git_object = gitoutput qw(rev-parse HEAD);
}
print STDERR join ' ', map { $_ // '?' }
"-- commitid", $git_object, $git_dirty, $git_count, "--\n";
foreach my $sz (2..10, qw(12 14 16)) {
gentextmodule_demo_start_batch();
if (defined($git_count)) {
genform_prep();
my $smallstr = rjustt($sz, 'Count', $git_count, $git_dirty);
my $forgitobj = $sz - length($git_count) - 1;
if (defined($git_object) && $forgitobj >= 2) {
$smallstr = ljustt($forgitobj, 'Objid', $git_object).
($git_dirty || ' ').
$git_count;
}
genform_plusq("Small$sz", $smallstr);
}
genform_prep();
genform_plusq("Git$sz", ljustt($sz, 'Objid', $git_object, $git_dirty))
if defined $git_object;
if (defined $git_count && defined $git_object && $sz<=10) {
genform_prep();
genform("Full".($sz*2),
ljustt($sz, 'Objid', $git_object),
rjustt($sz, 'Count', $git_count, $git_dirty));
genform_prep();
my $e = $sz;
genform("Full".($e*3)."T",
ljustt($e*2, 'Objid', $git_object, $git_dirty)
=~ m/.{$e}/g,
rjustt($e, 'Count', $git_count));
}
}
}
sub do_some_best ($$) {
my ($bestwhat, $formre) = @_;
my $modname = "Best$bestwhat";
my $fullmodname = "Commitid_${modname}_2D";
my @argl = qw(max_sz margin=Commitid_pixelsz());
p "module $fullmodname(".argl_formal(@argl).") {\n";
my $mbs = '$Commitid_max_best_scale';
p " sc_max = $mbs ? $mbs : 2;\n";
p " sz = max_sz - 2*[margin,margin];\n";
my @do;
foreach my $f (
sort {
$b->{Included}{$bestwhat} <=> $a->{Included}{$bestwhat} or
$b->{Chars} <=> $a->{Chars} or
$a->{Lines} <=> $b->{Chars}
}
grep {
$_->{Form} =~ m/$formre/ &&
!$_->{Ambiguous}
}
@forms
) {
my $form = $f->{Form};
p " sz_$form = Commitid_${form}_sz();\n";
foreach my $rot (qw(0 1)) {
my $id = "${form}_r${rot}";
p " sc_$id = min(sc_max";
foreach my $xy (qw(0 1)) {
p ",sz[$xy]/sz_$form","[",(($xy xor $rot)+0),"]";
}
p ");\n";
push @do, " if (sc_$id >= 1.0";
push @do, " && sc_$id >= sc_${form}_r1" if !$rot;
push @do, ") {\n";
push @do, " translate([margin,margin]) scale(sc_$id)\n";
push @do, " rotate(90) translate([0,-sz_$form"."[1]])\n" if $rot;
push @do, " Commitid_${form}_2D();\n";
push @do, " } else";
}
}
push @do, < 00 20 22 02 11
< 00 20 11 22 02
0 1 2 3 4 5 6 7 8 9
/#\ r /#\ ##\ # # ### /#/ ### /#\ /#\
# # /# # # # # # # # # # # #
# # # /#/ ##< \## ##\ ##\ // >#< \##
# # # # # # # # # # # # #
\#/ /#\ ### ##/ # ##/ \#/ # \#/ ##/
a b c d e f
# # /##
# /## # /#\ #
/## ##\ # /## #r# ###
# # # # # # # #/ #
\## ##/ \## \## \#/ #
+ *
# #
# \#/
### ###
# /#\
# #