Routines
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40726: Handler: Guardian
Handles the guardian (sprite IDs 148-149). Nothing happens unless the guardian is in the same room as the player.
Until all four pieces of the amulet have been collected (see 38669) the guardian is animated, and if it touches the player (see TestActorHurtingPlayer_Room) then the player is hit with a hit direction of 128 which makes the player fall straight down.
Once all four pieces have been collected the guardian steps aside to let the player past. It walks to the left if the X position of the player is 128 or more, but it does not move further left than 64. Otherwise it walks to the right, but it does not move further right than 191.
Input
IX Actor record
HandlerGuardian 40726 LD A,(38659) Fetch the room of the player from 38659.
40729 CP (IX+1) Compare with the room of the guardian.
40732 RET NZ Return if the guardian is in a different room.
40733 CALL StoreEntity Remember the previous position of the guardian.
40736 LD A,(38669) Fetch the amulet pieces collected from 38669.
40739 AND %00001111 Keep only bits 0-3.
40741 CP 15 Jump to HandlerGuardian_StepAside if all four amulet pieces have been collected.
40743 JR Z,HandlerGuardian_StepAside
40745 CALL AnimateRhino Animate the guardian.
40748 LD BC,5903 Set how far above and to the right of the guardian the player can be in BC to 5903.
40751 CALL TestActorHurtingPlayer_Room Test whether the guardian is touching the player.
40754 JP NC,DisplayActor Jump to DisplayActor to display the guardian if the player is not touching it.
40757 LD A,128 Set the hit direction of the player in 38660 to 128.
40759 LD (38660),A
40762 CALL PlayWarbleSound Play the warble sound.
40765 JP DisplayActor Jump to DisplayActor to display the guardian.
All four pieces have been collected. Walk to the left if the player is in the right half of the screen.
HandlerGuardian_StepAside 40768 LD A,(38661) Fetch the X position of the player from 38661.
40771 BIT 7,A Jump to HandlerGuardian_Right if the player is in the left half of the screen.
40773 JR Z,HandlerGuardian_Right
40775 LD (IX+6),224 Set the X velocity of the guardian to 224 (walking to the left).
40779 CALL MoveActor Work out the new position of the guardian.
40782 LD A,E Fetch the new X position of the guardian.
40783 CP 64 Compare with 64.
HandlerGuardian_Limit 40785 JP C,DisplayActor Jump to DisplayActor to display the guardian if it has reached the limit of its walk.
40788 LD (IX+3),E Set the new X position of the guardian.
40791 CALL AnimateRhino Animate the guardian.
40794 JP DisplayActor Jump to DisplayActor to display the guardian.
Walk to the right.
HandlerGuardian_Right 40797 LD (IX+6),32 Set the X velocity of the guardian to 32 (walking to the right).
40801 CALL MoveActor Work out the new position of the guardian.
40804 LD A,E Fetch the new X position of the guardian.
40805 CP 192 Compare with 192.
40807 CCF Invert the carry flag.
40808 JR HandlerGuardian_Limit Jump to HandlerGuardian_Limit.
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