Gunfright: Routine at B9DD

B9DD: Advance Gun Frame

Used by the routine at HandleOutlawGun.

Moves the outlaw's gun on to its next frame. If the player has provoked the outlaw, which is when DrawMessageState is one, the gun moves on every frame. Otherwise it moves on after a delay which is shorter at the higher levels of skill.

Input
IX	The address of the gun

AdvanceGunFrame

B9DD

LD A,($A211)

Fetch DrawMessageState.

B9E0

CP $01

Jump to AdvanceGunFrame_Next to move to the next frame at once if the outlaw has been provoked.

B9E2

JR Z,AdvanceGunFrame_Next

B9E4

LD A,(IX+$05)

Jump to AdvanceGunFrame_Reset if the delay is zero.

B9E7

AND A

B9E8

JR Z,AdvanceGunFrame_Reset

B9EA

DEC (IX+$05)

Count down the delay.

B9ED

RET

Return.

The delay has finished, so set a new one from the skill level.

AdvanceGunFrame_Reset

B9EE

LD A,($A261)

Fetch Skill.

B9F1

CPL

Invert it.

B9F2

AND %00000111

Keep a number from 00 to 07 which is smaller at the higher skill levels.

B9F4

LD (IX+$05),A

Set the delay.

AdvanceGunFrame_Next

B9F7

INC (IX+$0C)

Move on to the next frame.

B9FA

RET

Return.