1 files changed, 30 insertions, 0 deletions
diff --git a/lib/GridFiller/Constants.pm b/lib/GridFiller/Constants.pm
new file mode 100644
index 0000000..d707782
--- /dev/null
+++ b/lib/GridFiller/Constants.pm
@@ -0,0 +1,30 @@
+package GridFiller::Constants;
+use strict;
+use warnings;
+use Scalar::Readonly qw(readonly_on);
+use namespace::autoclean;
+require Exporter;
+
+our @ISA='Exporter';
+our @EXPORT=();
+our @EXPORT_OK=qw($HORIZONTAL $VERTICAL $BLACK $WHITE $NOTHING);
+our %EXPORT_TAGS=(
+    colours => [qw($BLACK $WHITE $NOTHING)],
+    directions => [qw($HORIZONTAL $VERTICAL)],
+    all => [@EXPORT_OK],
+);
+
+our $VERTICAL = 1;
+our $HORIZONTAL = 2;
+
+our $NOTHING = 0;
+our $BLACK = 1;
+our $WHITE = 2;
+
+readonly_on($VERTICAL);
+readonly_on($HORIZONTAL);
+readonly_on($NOTHING);
+readonly_on($BLACK);
+readonly_on($WHITE);
+
+1;