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Routines |
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Used by the routine at HandleNearArch.
Finds out if the player is going through a door. This is so when the player is standing in the place in front of the door and is allowed to open doors, which means that the player has to be alive. If it is, the player is let pass through the walls, and once it has gone far enough through, it is put into the next room, which is the room of the door.
When the player enters the next room it is put at the other side of the room along the same axis, the player's two object records are saved in PlayerRecords so that the player starts here again after losing a life, and the main loop is restarted at RunGame_NewRoom to build the room.
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| TestDoorPassage | 51202 | LD IY,42863 | Start with the first object record, ObjectsTable, which is the legs of the player. | |||||||
| 51206 | LD A,(IY+0) | Fetch the type of the legs. | ||||||||
| 51209 | SUB 16 | Take away 16 from it. | ||||||||
| 51211 | CP 32 | Return if the legs are not of a type that is from 16 to 47, which are the types of the player when alive. | ||||||||
| 51213 | RET NC | |||||||||
| 51214 | BIT 3,(IY+7) | Return if the player cannot open doors. | ||||||||
| 51218 | RET Z | |||||||||
| 51219 | CALL TestNearTo | Return if the player is not in front of the door. | ||||||||
| 51222 | RET NC | |||||||||
| 51223 | SET 0,(IY+7) | Make the player ignore the walls, so that it can go through the door. | ||||||||
| 51227 | LD BC,51259 | Take the table of the routines for the four directions that the player may face, DoorPassageRoutines. | ||||||||
| 51230 | LD HL,(42781) | Fetch the limits of the room. | ||||||||
| 51233 | PUSH HL | Stash them on the stack. | ||||||||
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Work out the direction that the player is facing, in the same way as GetFacingDirection.
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| 51234 | LD A,(IY+7) | Fetch the flags of the legs. | ||||||||
| 51237 | RRCA | Move bit 6, which mirrors the object, down to bit 3. | ||||||||
| 51238 | RRCA | |||||||||
| 51239 | RRCA | |||||||||
| 51240 | AND %00001000 | Keep only that bit. | ||||||||
| 51242 | XOR %00001000 | Flip it, to say that the object is not mirrored. | ||||||||
| 51244 | LD L,A | Stash the flag in L. | ||||||||
| 51245 | LD A,(IY+0) | Fetch the type of the legs. | ||||||||
| 51248 | AND %00000100 | Keep only bit 2 of the type. | ||||||||
| 51250 | OR L | Combine it with the other bit. | ||||||||
| 51251 | RRCA | Move the two bits down to bits 0 and 1. | ||||||||
| 51252 | RRCA | |||||||||
| 51253 | AND %00000011 | Keep only those two bits. | ||||||||
| 51255 | LD L,A | Set the direction in L. | ||||||||
| 51256 | JP RunGame_JumpViaTable | Jump to RunGame_JumpViaTable to run the routine for the direction. | ||||||||
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