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Routines |
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Used by the routines at MoveSpark and MoveDestroyer.
Takes one unit of energy off the sector that an entity is in. If the energy is down to five or fewer units then the player is told, and when it reaches zero the sector has been destroyed.
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| ReduceSectorEnergy | A32B | CALL FindSectorEnergy | Find the energy of the sector using FindSectorEnergy. | |||||
| A32E | DEC (HL) | Take one unit of energy off. | ||||||
| A32F | LD A,(HL) | Fetch the energy that is left. | ||||||
| A330 | CP $06 | Return if there are at least six units. | ||||||
| A332 | RET NC | |||||||
| A333 | LD C,A | Keep the energy. | ||||||
| A334 | AND A | Jump if there is some energy left. | ||||||
| A335 | JR NZ,ReduceSectorEnergy_Message | |||||||
| A337 | LD HL,$9659 | Point HL at the number of sectors that have been destroyed. | ||||||
| A33A | INC (HL) | Add one. | ||||||
| A33B | LD HL,$967E | Point HL at SectorStates. | ||||||
| A33E | ADD HL,DE | Add the sector number. | ||||||
| A33F | LD A,(HL) | Fetch the state of the sector. | ||||||
| A340 | AND $FC | Change it to destroyed (bit 0 set and bit 1 clear), clearing the flag that says it is under attack. | ||||||
| A342 | OR $01 | |||||||
| A344 | LD (HL),A | Store the new state. | ||||||
| A345 | PUSH DE | Save the sector number. | ||||||
| A346 | CALL DrawSectorMap | Colour the sector map using DrawSectorMap. | ||||||
| A349 | POP DE | Restore the sector number. | ||||||
| ReduceSectorEnergy_Message | A34A | LD A,E | Fetch the sector number... | |||||
| A34B | ADD A,$B1 | ...and convert it into the last character of the message "SECTOR n"... | ||||||
| A34D | LD ($9D4D),A | ...by writing it into the message. | ||||||
| A350 | LD D,E | Use the sector number as the argument of the message... | ||||||
| A351 | LD E,$01 | ...for message 01. | ||||||
| A353 | CALL QueueMessage | Queue it using QueueMessage. | ||||||
| A356 | LD E,$04 | Use message 04, "DESTROYED"... | ||||||
| A358 | LD A,C | ...but use message 07, "CRITICAL", instead... | ||||||
| A359 | AND A | ...unless the sector has no energy left, in which case jump to use "DESTROYED". | ||||||
| A35A | JR Z,ReduceSectorEnergy_QueueMessage | |||||||
| A35C | LD E,$07 | Use message 07, "CRITICAL". | ||||||
| ReduceSectorEnergy_QueueMessage | A35E | JP QueueMessage | Jump to QueueMessage. | |||||
| Prev: A320 | Up: Map | Next: A361 |