Knight Lore: Routine at C76C

C76C: Handle Flipped Near Arch

Used by the routine at HandleNearArch.

Sets up the near side of an arch whose sprite is flipped. The middle of the doorway is thirteen units back along the X axis.

Input
IX	Address of the arch object

Set the doorway middle and the distances that count as near.

HandleFlippedNearArch

C76C

LD HL,$FEEF

Set HL to the adjustments of EF in X and FE in Y.

C76F

Set the adjustments.

C772

LD A,(IX+$01)

Fetch the X coordinate of the arch.

C775

SUB $0D

Take 0D off it.

C777

LD (IX+$09),A

Keep it as the X coordinate of the middle of the doorway.

C77A

LD A,(IX+$02)

Fetch the Y coordinate of the arch.

C77D

LD (IX+$0A),A

Keep it as the Y coordinate of the middle of the doorway.

C780

LD HL,$0F06

Set H to the distance in Y that counts as near and L to the distance in X.

C783