some slight comment modifications

1 files changed, 40 insertions, 32 deletions

diff --git a/Perl/demos/Tk/demos/zinc_lib/path_tags.pl b/Perl/demos/Tk/demos/zinc_lib/path_tags.pl
index 695335b..0ea1619 100644
--- a/Perl/demos/Tk/demos/zinc_lib/path_tags.pl
+++ b/Perl/demos/Tk/demos/zinc_lib/path_tags.pl
@@ -1,39 +1,38 @@
 #!/usr/bin/perl -w
 # $Id$
-# these simple samples have been developped by C. Mertz mertz@cena.fr
+# this pathtatg demo have been developped by C. Mertz mertz@cena.fr
+# with the help of Daniel Etienne etienne@cena.fr
 
 use Tk;
 use Tk::Zinc;
 use strict;
 
-#exit if $Tk::Zinc::VERSION lt "3.2.5b";
-
-## this demo demonstrates the use of path tags to adress one or more items
-## belonging to ha hierarchy of groups.
-## This hierarchy is described just below, $gr_xxx designates a group
-## (with a tag xxx) and $i_yyy designates an non-group item (with a tag yyy).
-
-my $hierarchy = '
-#  $gr_top --- $gr_a --- $gr_aa --- $gr_aaa --- $gr_aaaa --- $i_aaaaa
-#          |         |          |           |-- $i_aaab  |-- $i_aaaab
-#          |         |          --- $i_aab
-#          |         |-- $i_ab
-#          |         |
-#          |         ---$gr_ac --- $i_aca
-#          |                   |
-#          |-- $i_b            --- $i_acb
+#This demo only works with Tk::Zinc > "3.2.5b";
+
+## this demo demonstrates the use of path tags to address one or more items
+## belonging to a hierarchy of groups.
+## This hierarchy is described just below, gr_xxx designates a group
+## (with a tag xxx) and i_yyy designates an non-group item (with a tag yyy).
+
+#  gr_top --- gr_a --- gr_aa --- gr_aaa --- gr_aaaa --- i_aaaaa
+#          |       |         |          |-- i_aaab  |-- i_aaaab
+#          |       |         -- i_aab
+#          |       |-- i_ab
+#          |       |
+#          |       ---gr_ac --- i_aca
+#          |                |
+#          |-- i_b          --- i_acb
 #          |
-#          --- $gr_c --- $gr_ca --- $i_caa
-#                    |          |
-#                    |          --- $i_cab
-#                    |-- $i_cb
-#                    |
-#                    ---$gr_cc --- $i_cca
-#                              |
-#                              --- $i_ccb
-the same objects are cloned and put in an other hierarchy where
-$gr_top is replace by $other_top
-';
+#          --- gr_c --- gr_ca --- i_caa
+#                   |         |
+#                   |         --- i_cab
+#                   |-- i_cb
+#                   |
+#                   ---gr_cc --- i_cca
+#                            |
+#                            --- i_ccb
+#the same objects are cloned and put in an other hierarchy where
+#gr_top is replaced by gr_other_top
 
 my $defaultForecolor = "sienna";
 my $mw = MainWindow->new();
@@ -61,6 +60,11 @@ my $zinc = $mw->Zinc(-width => 850, -height => 360, -font => "10x20",
 		     -borderwidth => 0, -backcolor => "white",
 		     -forecolor => $defaultForecolor,
 		     )->pack;
+
+###########################################
+# Creation of a bunch of radiobutton and a text input
+###########################################
+
 my $row = $mw->Frame()->pack();
 my @pl = qw/-side left -expand 1 -padx .5c -pady .2c/;
 my $left = $row->Frame->pack(@pl);
@@ -118,6 +122,8 @@ $zinc ->add('group', 1, -tags => ['top']);
 $zinc ->add('group', 1, -tags => ['other_top']);
 &createSubHierarchy ('other_top');
 
+### Here we create the genuine hierarchy of groups and items
+### Later we will create graphical objects to display groups
 sub createSubHierarchy {
     my ($gr) = @_;
     $zinc->add('group', $gr, -tags => ['a']);
@@ -163,7 +169,7 @@ sub createSubHierarchy {
 }
 
 
-# convert a list of items ids in a list of sorted tags (the first tag of each item)
+# converts a list of items ids in a list of sorted tags (the first tag of each item)
 sub items2tags {
     my @items = @_;
     my @selected_tags;
@@ -176,8 +182,8 @@ sub items2tags {
 }
 
 ### drawing :
-####   a rectangle for each group, with the group name (i.e. its first tag)
-###    a text for each item which is not a group
+####   a rectangle item for showing the bounding box of each group, 
+###    a text item for the group name (i.e. its first tag)
 
 ## backgrounds used to fill rectangles representing groups
 my @backgrounds = qw(grey90 grey82 grey75 grey68 grey60 grey52 grey45);
@@ -210,7 +216,9 @@ sub drawHierarchy {
     }
 }
 
-## this sub extracts out of groups both text and frame representing each group
+### this sub extracts out of groups both text and frame representing
+### each group. This is necessary to avoid unexpected selection of
+### rectangles and titles inside groups
 sub extractTextAndFrames {
     foreach my $group_title ($zinc->find('withtag', 'group_title || group_frame')) {
 	my @ancestors = $zinc->find('ancestor',$group_title);