Gunfright: Routine at 47581

47581: 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

47581

LD A,(41489)

Fetch DrawMessageState.

47584

CP 1

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

47586

JR Z,AdvanceGunFrame_Next

47588

LD A,(IX+5)

Jump to AdvanceGunFrame_Reset if the delay is zero.

47591

AND A

47592

JR Z,AdvanceGunFrame_Reset

47594

DEC (IX+5)

Count down the delay.

47597

RET

Return.

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

AdvanceGunFrame_Reset

47598

LD A,(41569)

Fetch Skill.

47601

CPL

Invert it.

47602

AND %00000111

Keep a number from 0 to 7 which is smaller at the higher skill levels.

47604

LD (IX+5),A

Set the delay.

AdvanceGunFrame_Next

47607

INC (IX+12)

Move on to the next frame.

47610

RET

Return.