Add consts for page orientations (#150)

1 files changed, 5 insertions, 0 deletions

diff --git a/def.go b/def.go
index 88e4dea..52e6474 100644
--- a/def.go
+++ b/def.go
@@ -39,6 +39,11 @@ type gradientType struct {
 	objNum            int
 }
 
+const (
+	OrientationPortrait  = "portrait"
+	OrientationLandscape = "landscape"
+)
+
 type colorMode int
 
 const (