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Routines |
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The routine for objects of type 88 to 8B, the ghosts. A ghost drifts towards the player and hurts the player if it touches. It vanishes when the player moves more than three cells away, and turns into a burst (scoring 10 hundred points) when a shot hits it.
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| UpdateGhost | BFF1 | CALL PlayGhostSound | Play the ghost's sound if the ghost has been drawn in the view. | |
| BFF4 | CALL SetVelocityTowardsPlayer | Make the ghost drift towards the player. | ||
| BFF7 | CALL SetDirectionFromVelocity | Move the ghost. | ||
| BFFA | BIT 0,(IX+$07) | Jump to UpdateGhost_Burst if the ghost has been hit by something. | ||
| BFFE | JR NZ,UpdateGhost_Burst | |||
| C000 | CALL MoveObject | Check whether the ghost has run into the scenery. | ||
| C003 | CALL NextSpriteNumber | Animate the ghost. | ||
| C006 | LD C,$03 | Set the distance at which the ghost gives up to 03 cells. | ||
| C008 | CALL CheckPlayerClose | Check whether the ghost is close to the player. | ||
| C00B | JR NC,UpdateGhost_Vanish | Jump to UpdateGhost_Vanish if the player is further away than that. | ||
| C00D | CALL CheckShotHit | Check whether a shot has hit the ghost. | ||
| C010 | JR C,UpdateGhost_ShotBurst | Jump to UpdateGhost_ShotBurst if it has. | ||
| C012 | CALL CheckPlayerCollision | Check whether the ghost is touching the player. | ||
| C015 | RET NC | Return if it is not. | ||
| C016 | JP HurtPlayer | Hurt the player (see HurtPlayer). | ||
| UpdateGhost_Vanish | C019 | LD (IX+$00),$00 | Remove the ghost, because the player has got away from it. | |
| C01D | RET | Return. | ||
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A shot has hit the ghost.
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| UpdateGhost_ShotBurst | C01E | LD (IY+$00),$0C | Turn the shot that hit the ghost into a burst. | |
| UpdateGhost_Burst | C022 | LD (IX+$00),$0C | Turn the ghost into a burst. | |
| C026 | LD BC,$0010 | Set the points for destroying a ghost. | ||
| C029 | JP AddToScore | Jump to AddToScore to add the points to the score. | ||
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