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Routines |
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Handles the Sabre Wulf (sprite IDs 50 to 57) when it is running. Bit 2 of the sprite ID is set when the Wulf is facing right.
Each time the Wulf is handled it animates, works out whether to head for the player (see ChooseWulfDirection) or pounce at them (see TestWulfPounce), moves with its velocity (see MoveActor), turns around if it was blocked and then hurts the player if it is touching them.
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| HandlerWulf | A858 | CALL StoreEntity | Remember the previous position of the Wulf. | |||||
| A85B | LD A,$20 | Set the width of the Wulf in Actor_Width to 20. | ||||||
| A85D | LD ($96AD),A | |||||||
| A860 | CALL AnimateActor | Animate the Wulf. | ||||||
| A863 | CALL ChooseWulfDirection | Choose the direction of the Wulf. | ||||||
| A866 | CALL TestWulfPounce | Test whether the Wulf should pounce. | ||||||
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This entry point is used by the routine at HandlerWulfLanding.
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| HandlerWulf_Move | A869 | CALL MoveActor | Work out the new position of the Wulf. | |||||
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Stop the Wulf moving through objects in the room. If it did not manage to move then turn it around.
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| A86C | LD BC,$171F | Set the height of the Wulf in B to 17 and the width in C to 1F. | ||||||
| A86F | CALL SlideActorPastObjects | Stop the Wulf passing through objects in the room. | ||||||
| A872 | CALL TestPositionUnchanged | Test whether the Wulf has stayed where it was. | ||||||
| A875 | JR NZ,HandlerWulf_Position | Jump to HandlerWulf_Position if the Wulf has moved. | ||||||
| A877 | CALL TurnWulfAround | Turn the Wulf around. | ||||||
| HandlerWulf_Position | A87A | LD (IX+$03),E | Set the X position of the Wulf. | |||||
| A87D | LD (IX+$04),D | Set the Y position of the Wulf. | ||||||
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This entry point is used by the routine at HandlerWulfPouncing.
The Wulf can only hurt the player if the player is in the same room and has the normal colour.
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| HandlerWulf_Touch | A880 | LD A,($9707) | Fetch the colour of the player from 9707. | |||||
| A883 | CP $47 | Jump to HandlerWulf_Draw if the player does not have the normal colour (INK:WHITE, PAPER:BLACK (BRIGHT)). | ||||||
| A885 | JR NZ,HandlerWulf_Draw | |||||||
| A887 | LD A,($9703) | Fetch the room of the player from 9703. | ||||||
| A88A | CP (IX+$01) | Jump to HandlerWulf_Draw if the Wulf is in a different room to the player. | ||||||
| A88D | JR NZ,HandlerWulf_Draw | |||||||
| A88F | LD BC,$0F1C | Set the reach used to test whether the Wulf is touching the player in BC to 0F1C. | ||||||
| A892 | CALL TestPlayerTouchingActor | Test whether the Wulf is touching the player. | ||||||
| A895 | JR NC,HandlerWulf_Draw | Jump to HandlerWulf_Draw if the Wulf is not touching the player. | ||||||
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Knock the player in the direction the Wulf is facing.
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| A897 | LD A,(IX+$00) | Fetch the sprite ID of the Wulf. | ||||||
| A89A | CPL | Flip the bits. | ||||||
| A89B | RRCA | Rotate right twice, so bit 2 is now in bit 0. | ||||||
| A89C | RRCA | |||||||
| A89D | AND %00000001 | Keep only bit 0. | ||||||
| A89F | INC A | Add one, giving a hit direction of 01 or 02. | ||||||
| A8A0 | LD ($9704),A | Store the hit direction in 9704. | ||||||
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Turn the Wulf around unless the player is attacking.
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| A8A3 | LD A,($9702) | Fetch the sprite ID of the player from ImmortalData. | ||||||
| A8A6 | SUB $20 | Subtract 20 (the first attacking Sabreman sprite ID). | ||||||
| A8A8 | CP $10 | Jump to HandlerWulf_Draw if the player is attacking. | ||||||
| A8AA | JR C,HandlerWulf_Draw | |||||||
| A8AC | CALL TurnWulfAround | Turn the Wulf around. | ||||||
| HandlerWulf_Draw | A8AF | JP UpdateActor | Jump to UpdateActor to update the Wulf. | |||||
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