Gunfright: Routine at B7F0

B7F0: Set Frame And Flip

Used by the routine at HandleBystander.

Chooses the frame of a walking figure and whether its sprite is flipped, from the direction in which it is walking and the view. Bits 6 and 7 of byte 06 of the object hold the direction.

Input
IX	The address of the object

Choose the frame from the direction and the view.

SetFrameAndFlip

B7F0

LD A,($A268)

Fetch the view number and keep it in B.

B7F3

LD B,A

B7F4

LD A,(IX+$06)

Fetch the direction.

B7F7

SUB $40

Take one off the direction.

B7F9

RLCA

Move bit 7 into bit 0.

B7FA

AND %00000001

Keep bit 0.

B7FC

XOR B

Combine it with the view.

B7FD

LD (IX+$0C),A

Set the frame.

Set the flip bit from the direction.

B800

LD A,(IX+$06)

Fetch the direction.

B803

AND %01000000

Keep bit 6.

B805

LD C,A

Keep the flip bit in C.

B806

LD A,(IX+$07)

Fetch the flags.

B809

AND %10111111

Clear bit 6.

B80B

OR C

Set bit 6 if the direction says so.

B80C

LD (IX+$07),A

Store the flags.

B80F

RET

Return.