From d953c1777587adf946a07d505c9f5d52325a0c1d Mon Sep 17 00:00:00 2001
From: mertz
Date: Mon, 18 Nov 2002 16:36:53 +0000
Subject: ajout de la methode de compatibilit� coords0 pour remplacer la
 m�thode coords dans les vieilles applications.

---
 Perl/Zinc.pm | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/Perl/Zinc.pm b/Perl/Zinc.pm
index 1bd3fc1..2161e12 100644
--- a/Perl/Zinc.pm
+++ b/Perl/Zinc.pm
@@ -7,6 +7,7 @@ package Tk::Zinc;
 use Tk;
 #use AutoLoader;
 #use Exporter;
+use Carp;
 
 use base qw(Tk::Widget); 
 Construct Tk::Widget 'Zinc';
@@ -47,6 +48,52 @@ Tk::Methods("add", "addtag", "anchorxy", "bbox", "becomes", "bind", "cget",
 	    "select", "smooth", "tapply", "tdelete", "transform", "translate",
 	    "treset", "trestore", "tsave", "type", "vertexat");
 
+## coord0 is a compatibility function usefull for porting old application
+## previously running with Tk::Zinc V <= 3.2.6a
+## The Zinc methode coords0 can/should replace coords as long as no control points are
+## used in curve or rectangle or an arc...
+## This can dramaticaly simplify the port of an old application from Zinc V<3.2.6a to
+## a newer version of Zinc. HOWEVER YOU STILL MUST CHANGE THE CODE OF THIS OLD APPICATION
+##
+## Remember: the incompatible change in Zinc is due to the introduction of
+## control points in curves (and a future release, in arc or rectangle items...)
+sub coords0 {
+    if (wantarray) {
+	## we are in list context, so we should convert the returned value
+	## to match the specification of Zinc Version <= 3.2.6a
+	my @res = &Tk::Zinc::coords(@_);
+	if ( !ref $res[0] ) {
+	    ## The first item of the list is not a reference, so the
+	    ## list is guarranted to be a flat list (x, y, x, y, ... x, y)
+	    return @res;
+	}
+	else {
+	    ## The list is a list of references like : [x y] or [x y symbol] 
+	    ## In the latter case, coord0 should warn that there is a control point!
+	    ## coord0 will return a flatten list of (x, y, ... x , y)
+	    my @res0;
+	    foreach my $ref (@res) {
+		my @array = ${$ref};
+	        if ($#array > 1) {
+		   my $item = $_[1];
+		   my $zinc = $_[0];
+		   my $type = $zinc->type($item);
+		   carp "Using Zinc coord0 compatibility method with item $item (type=$type) which contains a control point: @array";
+	        }
+		push @res0, $array[0];
+		push @res0, $array[1];
+	    }
+	    return @res0;
+        }
+    }
+    else {
+	## contexte scalaire
+	## le résultats n'étais pas utilisés jusqu'à présent, vu le bug...
+	## donc inutile de le convertir!
+	return &Tk::Zinc::coords(@_);
+    }
+}
+
 1;
 
 __END__
-- 
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