Knight Lore: Routine at B9A5

B9A5: Handle Guard Or Wizard

Handles the top half of a guard or of the wizard, who patrol round the room, following the walls. The bottom half is the next object in the table and it is moved with the top half.

Input
IX	Address of the top half of the guard

Move the guard and keep the bottom half in step.

HandleGuardOrWizard

B9A5

CALL SetPixelAdjustments_GuardTop

Set the pixel adjustments of a guard.

B9A8

CALL ApplyGravityAndMove

Apply gravity to the guard and move it.

B9AB

CALL GetGuardSpeeds

Work out the speeds of the guard from its direction.

B9AE

LD (IX+$09),L

Set the speed in X of the guard.

B9B1

LD (IX+$29),L

Set the speed in X of the bottom half.

B9B4

LD (IX+$0A),H

Set the speed in Y of the guard.

B9B7

LD (IX+$2A),H

Set the speed in Y of the bottom half.

B9BA

LD A,(IX+$01)

Fetch the X coordinate of the guard.

B9BD

LD (IX+$21),A

Set the X coordinate of the bottom half.

B9C0

LD A,(IX+$02)

Fetch the Y coordinate of the guard.

B9C3

LD (IX+$22),A

Set the Y coordinate of the bottom half.

B9C6

CALL FaceDirectionOfMovement

Choose the graphic of the guard from its direction.

B9C9

JP SetDeadlyFlagsAndDraw

Make the guard deadly and flag it to be drawn again.