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Routines |
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Used by the routine at MoveLightUp.
Tries to turn a light so that it goes left or right. If neither of the cells is part of the frame then the light is turned round, and the routine tries to turn it vertically instead, but only once.
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| TurnLightHorizontally | B01C | LD L,E | Point HL at the cell on the left. | |||||||
| B01D | LD H,D | |||||||||
| B01E | DEC L | |||||||||
| B01F | LD A,(HL) | Fetch the attribute of the cell. | ||||||||
| B020 | CP $48 | Jump to turn left if it is part of the frame. | ||||||||
| B022 | JR Z,SetLightLeft | |||||||||
| B024 | INC L | Move to the cell on the right. | ||||||||
| B025 | INC L | |||||||||
| B026 | LD A,(HL) | Fetch the attribute of the cell. | ||||||||
| B027 | CP $48 | Jump to turn right if it is part of the frame. | ||||||||
| B029 | JR Z,SetLightRight | |||||||||
| B02B | LD A,($9629) | Fetch the flag that says that the light has turned. | ||||||||
| B02E | AND A | Return if it has. | ||||||||
| B02F | RET NZ | |||||||||
| B030 | OR $01 | Set the flag... | ||||||||
| B032 | LD ($9629),A | ...and store it. | ||||||||
| B035 | LD A,(IX+$00) | Fetch the type of the light. | ||||||||
| B038 | XOR $08 | Turn the light round, and store it. | ||||||||
| B03A | LD (IX+$00),A | |||||||||
| B03D | JR TurnLightVertically | Jump to try to turn the light vertically. | ||||||||
| Prev: AFF6 | Up: Map | Next: B03F |