1 files changed, 58 insertions, 0 deletions
diff --git a/src/map/unitdefines.h b/src/map/unitdefines.h
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+/**
+ * This file is part of Hercules.
+ * http://herc.ws - http://github.com/HerculesWS/Hercules
+ *
+ * Copyright (C) 2012-2019 Hercules Dev Team
+ * Copyright (C)  Athena Dev Teams
+ *
+ * Hercules is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef MAP_UNITDEFINES_H
+#define MAP_UNITDEFINES_H
+
+/**
+ * Used for directions, @see unit_data.dir
+ */
+enum unit_dir {
+	UNIT_DIR_UNDEFINED = -1,
+	UNIT_DIR_FIRST     = 0,
+	UNIT_DIR_NORTH     = 0,
+	UNIT_DIR_NORTHWEST = 1,
+	UNIT_DIR_WEST      = 2,
+	UNIT_DIR_SOUTHWEST = 3,
+	UNIT_DIR_SOUTH     = 4,
+	UNIT_DIR_SOUTHEAST = 5,
+	UNIT_DIR_EAST      = 6,
+	UNIT_DIR_NORTHEAST = 7,
+	UNIT_DIR_MAX       = 8,
+	/* IMPORTANT: Changing the order would break the above macros
+	 * and several usages of directions anywhere */
+};
+
+/* Returns the opposite of the facing direction */
+#define unit_get_opposite_dir(dir) ( ((dir) + 4) % UNIT_DIR_MAX )
+
+/* Returns true when direction is diagonal/combined (ex. UNIT_DIR_NORTHWEST, UNIT_DIR_SOUTHWEST, ...) */
+#define unit_is_diagonal_dir(dir) ( ((dir) % 2) == UNIT_DIR_NORTHWEST )
+
+/* Returns true if direction equals val or the opposite direction of val */
+#define unit_is_dir_or_opposite(dir, val) ( ((dir) % 4) == (val) )
+
+/* Returns the next direction after 90° CCW on a compass */
+#define unit_get_ccw90_dir(dir) ( ((dir) + 2) % UNIT_DIR_MAX )
+
+/* Returns a random diagonal direction */
+#define unit_get_rnd_diagonal_dir() ( UNIT_DIR_NORTHWEST + 2 * (rnd() % 4) )
+
+#endif /* MAP_UNITDEFINES_H */