(svn r3767) Move all direction related enums and functions to a separate header

1 files changed, 49 insertions, 0 deletions

diff --git a/direction.h b/direction.h
new file mode 100644
index 000000000..0300db8a9
--- /dev/null
+++ b/direction.h
@@ -0,0 +1,49 @@
+/* $Id$ */
+
+#ifndef DIRECTION_H
+#define DIRECTION_H
+
+/* Direction as commonly used in v->direction, 8 way. */
+typedef enum Direction {
+	DIR_N   = 0,
+	DIR_NE  = 1,      /* Northeast, upper right on your monitor */
+	DIR_E   = 2,
+	DIR_SE  = 3,
+	DIR_S   = 4,
+	DIR_SW  = 5,
+	DIR_W   = 6,
+	DIR_NW  = 7,
+	DIR_END,
+	INVALID_DIR = 0xFF,
+} Direction;
+
+
+/* Direction commonly used as the direction of entering and leaving tiles, 4-way */
+typedef enum DiagDirection {
+	DIAGDIR_NE  = 0,      /* Northeast, upper right on your monitor */
+	DIAGDIR_SE  = 1,
+	DIAGDIR_SW  = 2,
+	DIAGDIR_NW  = 3,
+	DIAGDIR_END,
+	INVALID_DIAGDIR = 0xFF,
+} DiagDirection;
+
+static inline DiagDirection ReverseDiagDir(DiagDirection d)
+{
+	return 2 ^ d;
+}
+
+
+static inline DiagDirection DirToDiagdir(Direction dir)
+{
+	return (DiagDirection)(dir >> 1);
+}
+
+
+/* the 2 axis */
+typedef enum Axis {
+	AXIS_X = 0,
+	AXIS_Y = 1
+} Axis;
+
+#endif