Routines
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D978: Set Sprite From Direction
Used by the routines at UpdateCreature and UpdateMonster.
Sets the sprite of an object from the direction that it is facing. Bit 1 of the type is set from the direction, bit 0 is flipped, and the flip flag is set from the direction, with both the sprite and the flip changed when the view is rotated.
Input
IX Object
SetSpriteFromDirection D978 LD A,($BBBA) Fetch whether the view is turned round, and double it.
D97B ADD A,A
D97C LD B,A
D97D LD A,(IX+$06) Work out bit 1 of the type from the direction.
D980 SUB $40
D982 RLCA
D983 RLCA
D984 AND $02
D986 LD C,A
D987 LD A,(IX+$00) Set bit 1 of the type from the direction, flip bit 0 to change the frame, and flip bit 1 as well if the view is rotated.
D98A AND $FD
D98C OR C
D98D XOR $01
D98F XOR B
D990 LD (IX+$00),A
D993 LD A,(IX+$06) Fetch the direction of the object, and keep bit 6.
D996 AND $40
D998 LD C,A
D999 LD A,(IX+$07) Set the flip flag of the object from it.
D99C AND $BF
D99E OR C
D99F LD (IX+$07),A
D9A2 RET Return.
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