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package OsmoLadder;
# Perl Module to generate ladder diagrams for network protocols
#
# (C) 2010-2011 by Harald Welte <laforge@gnumonks.org>
#
# This program is free software; 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
use GD;
use GD::Arrow;
my $ROW_SIZE = 50;
my $HEAD_SIZE = 70;
my $TITLE_SIZE = 20;
my $FOOT_SIZE = 50;
my $COL_SIZE_MIN = 200;
my $MARGIN_LR = 50;
my $NODELINE_OVERLAP = 30;
my $FONT = "/usr/share/fonts/truetype/freefont/FreeSansBold.ttf";
my $graph_title;
sub compute_img_size($$)
{
my ($num_nodes, $num_msgs) = @_;
my $height = (($num_msgs-1) * $ROW_SIZE) +
$HEAD_SIZE + $TITLE_SIZE + $FOOT_SIZE;
my $width = 2*$MARGIN_LR + ($num_nodes-1)*$COL_SIZE_MIN;
return ($width, $height);
}
sub compute_node_x($)
{
my $node_num = shift;
return $MARGIN_LR + $node_num * $COL_SIZE_MIN;
}
sub compute_msg_y($)
{
my $msg_num = shift;
return $HEAD_SIZE + $TITLE_SIZE + $msg_num * $ROW_SIZE;
}
my %nodes;
my $next_node_number = 0;
my @msgs;
sub new_node($$)
{
my ($name, $label) = @_;
my %nn;
$nn{'name'} = $name;
$nn{'label'} = $label;
$nn{'num'} = $next_node_number++;
$nn{'x_pos'} = compute_node_x($nn{'num'});
$nodes{$name} = \%nn;
}
sub new_msg($$$$)
{
my ($src, $dst, $label, $flags) = @_;
my %nm;
$nm{'src'} = $src;
$nm{'dst'} = $dst;
$nm{'label'} = $label;
$nm{'flags'} = $flags;
push(@msgs, \%nm);
}
sub try_fontsize($$$)
{
my ($font, $text, $size) = @_;
my @arr = GD::Image->stringFT(0, $font, $size, 0, 0, 0, $text);
return ($arr[4] - $arr[0]);
}
sub get_fontsize($$$)
{
my ($font, $text, $x_avail) = @_;
my $fontsize;
for ($fontsize = 12; $fontsize >= 6; $fontsize--) {
my $width = try_fontsize($font, $text, $fontsize);
if ($width < $x_avail) {
return ($fontsize, $width);
}
}
return (6,0);
}
sub draw_scaled_label($$$$$)
{
my ($im, $text, $line_y, $start_x, $end_x) = @_;
my $black = $im->colorAllocate(0, 0, 0);
if ($start_x > $end_x) {
my $tmp = $end_x;
$end_x = $start_x;
$start_x = $tmp;
}
my $delta_x = $end_x - $start_x;
my ($fontsize, $x_pixels) = get_fontsize($FONT, $text, $delta_x);
my $x_offset = ($delta_x - $x_pixels)/2;
my @a = $im->stringFT($black, $FONT, $fontsize, 0,
$start_x+$x_offset, $line_y-5, $text);
}
sub draw_msg_label($$$$$)
{
my ($im, $m, $line_y, $start_x, $end_x) = @_;
my $text = $$m{'label'};
draw_scaled_label($im, $text, $line_y, $start_x, $end_x);
}
sub set_title($)
{
$graph_title = shift;
}
sub draw_graph($)
{
my $outfile_name = shift;
my $num_nodes = keys %nodes;
my $num_msgs = @msgs;
my ($x, $y) = compute_img_size($num_nodes, $num_msgs);
my $im = new GD::Image($x, $y);
my $white = $im->colorAllocate(255, 255, 255);
$im->transparent($white);
my $black = $im->colorAllocate(0, 0, 0);
if ($graph_title) {
my $gap_oneside = ($x/2) * 0.8;
draw_scaled_label($im, $graph_title, $TITLE_SIZE,
$x/2-$gap_oneside, $x/2+$gap_oneside);
}
# vertical lines for each of the nodes in the graph
foreach my $n (values %nodes) {
printf("node %s (%s)\n", $$n{'name'}, $$n{'label'});
my $line_x = $$n{'x_pos'};
my $start_y = compute_msg_y(0)-$NODELINE_OVERLAP;
my $end_y = compute_msg_y($num_msgs-1)+$NODELINE_OVERLAP;
$im->line($line_x, $start_y, $line_x, $end_y, $black);
my $space_oneside = ($COL_SIZE_MIN/2) * 0.8;
draw_scaled_label($im, $$n{'label'}, $start_y-10,
$line_x-$space_oneside,
$line_x+$space_oneside);
}
# draw per-message arrows
$im->setThickness(2);
my $msg_n = 0;
foreach my $m (@msgs) {
my $line_y = compute_msg_y($msg_n++);
my $start_node = $nodes{$$m{'src'}};
my $end_node = $nodes{$$m{'dst'}};
my $start_x = $$start_node{'x_pos'};
my $end_x = $$end_node{'x_pos'};
if ($$m{'flags'} =~ /\W+both\W*/) {
# FIXME
}
if ($$m{'flags'} =~ /\W+dashed\W*/) {
print("setting dahsed style\n");
$im->setStyle($black, $black, gdTransparent,
gdTransparent);
}
#$im->line($start_x, $line_y, $end_x, $line_y, $black);
my $arrow = GD::Arrow::Full->new(-X1 => $end_x,
-Y1 => $line_y,
-X2 => $start_x,
-Y2 => $line_y,
-WIDTH => 3);
$im->polygon($arrow, $black);
draw_msg_label($im, $m, $line_y-5, $start_x, $end_x)
}
open(OUTFILE, ">$outfile_name");
print(OUTFILE $im->png);
close(OUTFILE);
}
1;
__END__
sub test()
{
new_node('ms', 'MS');
new_node('bts', 'BTS');
new_node('bsc', 'BSC');
new_msg('ms', 'bts', 'RACH REQ', undef);
new_msg('bts', 'bsc', 'RSL CHAN RQD', undef);
new_msg('bsc', 'bts', 'RSL CHAN ACT', undef);
new_msg('bts', 'bsc', 'RSL CHAN ACT ACK', undef);
draw_graph();
}
test();
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