+
+/* values for change events for custom elements (stored in level file) */
+#define CE_DELAY 0
+#define CE_TOUCHED_BY_PLAYER 1
+#define CE_PRESSED_BY_PLAYER 2
+#define CE_PUSHED_BY_PLAYER 3
+#define CE_DROPPED_BY_PLAYER 4
+#define CE_COLLISION 5
+#define CE_IMPACT 6
+#define CE_SMASHED 7
+#define CE_OTHER_IS_TOUCHING 8
+#define CE_OTHER_IS_CHANGING 9
+#define CE_OTHER_IS_EXPLODING 10
+#define CE_OTHER_GETS_TOUCHED 11
+#define CE_OTHER_GETS_PRESSED 12
+#define CE_OTHER_GETS_PUSHED 13
+#define CE_OTHER_GETS_COLLECTED 14
+#define CE_OTHER_GETS_DROPPED 15
+#define CE_BY_PLAYER 16 /* obsolete; now CE_BY_DIRECT_ACTION */
+#define CE_BY_COLLISION 17 /* obsolete; now CE_BY_DIRECT_ACTION */
+#define CE_BY_OTHER_ACTION 18 /* activates other element events */
+#define CE_BY_DIRECT_ACTION 19 /* activates direct element events */
+#define CE_OTHER_GETS_DIGGED 20
+#define CE_ENTERED_BY_PLAYER 21
+#define CE_LEFT_BY_PLAYER 22
+#define CE_OTHER_GETS_ENTERED 23
+#define CE_OTHER_GETS_LEFT 24
+
+/* values for derived change events (determined from properties above) */
+#define CE_TOUCHING_SOME_SIDE 25 /* summarized left/right/up/down/any */
+
+#define NUM_CHANGE_EVENTS 26
+
+#define CE_BITMASK_DEFAULT 0
+
+#define CH_EVENT_BIT(c) (1 << (c))
+#define CH_EVENT_VAR(e) (element_info[e].change->events)
+#define CH_ANY_EVENT_VAR(e) (element_info[e].change_events)
+
+#define HAS_CHANGE_EVENT(e,c) (IS_CUSTOM_ELEMENT(e) && \
+ (CH_EVENT_VAR(e) & CH_EVENT_BIT(c)) != 0)
+#define HAS_ANY_CHANGE_EVENT(e,c) (IS_CUSTOM_ELEMENT(e) && \
+ (CH_ANY_EVENT_VAR(e) & CH_EVENT_BIT(c)) != 0)
+#define SET_CHANGE_EVENT(e,c,v) (IS_CUSTOM_ELEMENT(e) ? \
+ ((v) ? \
+ (CH_EVENT_VAR(e) |= CH_EVENT_BIT(c)) : \
+ (CH_EVENT_VAR(e) &= ~CH_EVENT_BIT(c))) : 0)
+
+/* values for change sides for custom elements */
+#define CH_SIDE_NONE MV_NO_MOVING
+#define CH_SIDE_LEFT MV_LEFT
+#define CH_SIDE_RIGHT MV_RIGHT
+#define CH_SIDE_TOP MV_UP
+#define CH_SIDE_BOTTOM MV_DOWN
+#define CH_SIDE_LEFT_RIGHT MV_HORIZONTAL
+#define CH_SIDE_TOP_BOTTOM MV_VERTICAL
+#define CH_SIDE_ANY MV_ANY_DIRECTION
+
+/* values for change power for custom elements */
+#define CP_NON_DESTRUCTIVE 0
+#define CP_HALF_DESTRUCTIVE 1
+#define CP_FULL_DESTRUCTIVE 2
+
+/* values for special move patterns (bits 0-3: basic move directions) */
+#define MV_BIT_TOWARDS_PLAYER 4
+#define MV_BIT_AWAY_FROM_PLAYER 5
+#define MV_BIT_ALONG_LEFT_SIDE 6
+#define MV_BIT_ALONG_RIGHT_SIDE 7
+#define MV_BIT_TURNING_LEFT 8
+#define MV_BIT_TURNING_RIGHT 9
+#define MV_BIT_WHEN_PUSHED 10
+
+/* values for special move patterns for custom elements */
+#define MV_HORIZONTAL (MV_LEFT | MV_RIGHT)
+#define MV_VERTICAL (MV_UP | MV_DOWN)
+#define MV_ALL_DIRECTIONS (MV_HORIZONTAL | MV_VERTICAL)
+#define MV_ANY_DIRECTION (MV_ALL_DIRECTIONS)
+#define MV_TOWARDS_PLAYER (1 << MV_BIT_TOWARDS_PLAYER)
+#define MV_AWAY_FROM_PLAYER (1 << MV_BIT_AWAY_FROM_PLAYER)
+#define MV_ALONG_LEFT_SIDE (1 << MV_BIT_ALONG_LEFT_SIDE)
+#define MV_ALONG_RIGHT_SIDE (1 << MV_BIT_ALONG_RIGHT_SIDE)
+#define MV_TURNING_LEFT (1 << MV_BIT_TURNING_LEFT)
+#define MV_TURNING_RIGHT (1 << MV_BIT_TURNING_RIGHT)
+#define MV_WHEN_PUSHED (1 << MV_BIT_WHEN_PUSHED)
+
+/* values for slippery property for custom elements */
+#define SLIPPERY_ANY_RANDOM 0
+#define SLIPPERY_ANY_LEFT_RIGHT 1
+#define SLIPPERY_ANY_RIGHT_LEFT 2
+#define SLIPPERY_ONLY_LEFT 3
+#define SLIPPERY_ONLY_RIGHT 4
+
+/* macros for configurable properties */
+#define IS_DIGGABLE(e) HAS_PROPERTY(e, EP_DIGGABLE)
+#define IS_COLLECTIBLE_ONLY(e) HAS_PROPERTY(e, EP_COLLECTIBLE_ONLY)
+#define DONT_RUN_INTO(e) HAS_PROPERTY(e, EP_DONT_RUN_INTO)
+#define DONT_COLLIDE_WITH(e) HAS_PROPERTY(e, EP_DONT_COLLIDE_WITH)
+#define DONT_TOUCH(e) HAS_PROPERTY(e, EP_DONT_TOUCH)