Atic Atac: Routine at 82C3

82C3: Turn a signed value into a direction code

Used by the routine at AIM_SWORD. Zero, positive or negative becomes 0 or 4 in C, which is then used to pick a sprite or a table entry. The game's usual way of turning "which way is it going" into "which picture".
SIGN_TO_DIRECTION	82C3	LD C,$00
	82C5	LD A,(HL)
	82C6	AND A
	82C7	JR Z,SIGN_TO_DIRECTION_3
	82C9	JP P,SIGN_TO_DIRECTION_0
	82CC	LD C,$04
SIGN_TO_DIRECTION_0	82CE	DEC HL
	82CF	LD A,(HL)
	82D0	AND A
	82D1	JR Z,SIGN_TO_DIRECTION_1
	82D3	JP P,SIGN_TO_DIRECTION_2
	82D6	DEC C
SIGN_TO_DIRECTION_1	82D7	LD A,C
	82D8	AND $07
	82DA	ADD A,$38
	82DC	LD HL,$EA98
	82DF	LD (HL),A
	82E0	RET
SIGN_TO_DIRECTION_2	82E1	INC C
	82E2	JR SIGN_TO_DIRECTION_1
SIGN_TO_DIRECTION_3	82E4	DEC HL
	82E5	BIT 7,(HL)
	82E7	JR Z,SIGN_TO_DIRECTION_4
	82E9	LD C,$06
	82EB	JR SIGN_TO_DIRECTION_1
SIGN_TO_DIRECTION_4	82ED	LD C,$02
	82EF	JR SIGN_TO_DIRECTION_1