Contact Sam Cruise: Routine at F6A2

F6A2: Calculate the x-coordinate of the front column of a character's sprite

Used by the routines at 6CF4, 7866 and F6B0. Returns with C holding the x-coordinate of the front column of a character's sprite (that is, the left column if he's facing left, or the right column if he's facing right), A holding the remainder when C is divided by 8, and the zero flag set if the remainder is 0.

Input
H	Character number (0xD7-0xE6)

F6A2

LD L,$00

Point HL at byte 0x00 of the character's buffer

F6A4

LD A,(HL)

A=character's animatory state

F6A5

RLCA

Set the carry flag if the character is facing left, reset it if he's facing right

F6A6

CCF

F6A7

SBC A,A

Now A=0 if the character is facing left, or 2 if he's facing right

F6A8

INC A

F6A9

ADD A,A

F6AA

INC L

Point HL at byte 0x01 of the character's buffer

F6AB

ADD A,(HL)

Add the character's x-coordinate

F6AC

LD C,A

C=x-coordinate of the front column of the character's sprite

F6AD

AND $07

A=C%8, with the zero flag if this is 0

F6AF

RET