diff --git a/src/Chart.vala b/src/Chart.vala
index afc0634..e453ba4 100644
--- a/src/Chart.vala
+++ b/src/Chart.vala
@@ -303,7 +303,7 @@ namespace CairoChart {
 		}
 		protected virtual void rot_axes_titles () {
 			foreach (var s in series)
-				s.axis_y.title.style.direct = FontDirect.VERTICAL;
+				s.axis_y.title.style.orient = Gtk.Orientation.VERTICAL;
 		}
 
 		protected virtual void eval_plarea () {
diff --git a/src/Font.vala b/src/Font.vala
index 307ec36..2f85e5b 100644
--- a/src/Font.vala
+++ b/src/Font.vala
@@ -1,21 +1,5 @@
 namespace CairoChart {
 
-	/**
-	 * ``Font`` direction.
-	 */
-	public enum FontDirect {
-
-		/**
-		 * Horizontal font/text direction.
-		 */
-		HORIZONTAL = 0,
-
-		/**
-		 * Vertical font/text direction.
-		 */
-		VERTICAL
-	}
-
 	/**
 	 * ``Font`` style.
 	 */
@@ -42,9 +26,9 @@ namespace CairoChart {
 		Cairo.FontWeight weight;
 
 		/**
-		 * Font/Text direction.
+		 * Font/Text orientation.
 		 */
-		FontDirect direct;
+		Gtk.Orientation orient;
 
 		/**
 		 * Constructs a new ``Font``.
@@ -52,19 +36,19 @@ namespace CairoChart {
 		 * @param size the new font size, in user space units.
 		 * @param slant the slant for the font.
 		 * @param weight the weight for the font.
-		 * @param direct font/text direction.
+		 * @param orient font/text orientation.
 		 */
 		public Font (string family = "Sans",
 		              double size = 10,
 		              Cairo.FontSlant slant = Cairo.FontSlant.NORMAL,
 		              Cairo.FontWeight weight = Cairo.FontWeight.NORMAL,
-		              FontDirect direct = FontDirect.HORIZONTAL
+		              Gtk.Orientation orient = Gtk.Orientation.HORIZONTAL
 		) {
 			this.family = family;
 			this.size = size;
 			this.slant = slant;
 			this.weight = weight;
-			this.direct = direct;
+			this.orient = orient;
 		}
 	}
 }
diff --git a/src/Text.vala b/src/Text.vala
index 4e1270e..612ea83 100644
--- a/src/Text.vala
+++ b/src/Text.vala
@@ -25,18 +25,18 @@ namespace CairoChart {
 
 		public virtual double get_width (Cairo.Context ctx) {
 			var extents = get_extents (ctx);
-			switch (style.direct) {
-			case FontDirect.HORIZONTAL: return extents.width;
-			case FontDirect.VERTICAL: return extents.height;
+			switch (style.orient) {
+			case Gtk.Orientation.HORIZONTAL: return extents.width;
+			case Gtk.Orientation.VERTICAL: return extents.height;
 			default: return 0.0;
 			}
 		}
 
 		public virtual double get_height (Cairo.Context ctx) {
 			var extents = get_extents (ctx);
-			switch (style.direct) {
-			case FontDirect.HORIZONTAL: return extents.height;
-			case FontDirect.VERTICAL: return extents.width;
+			switch (style.orient) {
+			case Gtk.Orientation.HORIZONTAL: return extents.height;
+			case Gtk.Orientation.VERTICAL: return extents.width;
 			default: return 0.0;
 			}
 		}
@@ -49,12 +49,12 @@ namespace CairoChart {
 		public virtual Size get_size (Cairo.Context ctx) {
 			var sz = Size();
 			var extents = get_extents (ctx);
-			switch (style.direct) {
-			case FontDirect.HORIZONTAL:
+			switch (style.orient) {
+			case Gtk.Orientation.HORIZONTAL:
 				sz.width = extents.width + extents.x_bearing;
 				sz.height = extents.height;
 				break;
-			case FontDirect.VERTICAL:
+			case Gtk.Orientation.VERTICAL:
 				sz.width = extents.height; // + extents.x_bearing ?
 				sz.height = extents.width; // +- extents.y_bearing ?
 				break;
@@ -67,7 +67,7 @@ namespace CairoChart {
 			                         style.slant,
 			                         style.weight);
 			ctx.set_font_size(style.size);
-			if (style.direct == FontDirect.VERTICAL) {
+			if (style.orient == Gtk.Orientation.VERTICAL) {
 				ctx.rotate(- GLib.Math.PI / 2.0);
 				ctx.show_text(text);
 				ctx.rotate(GLib.Math.PI / 2.0);