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Routines |
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The handler for the doors that are open (sprite IDs 21 and 23 in HandlerTable2) and that close after a time, as made by RandomiseDoors. On every other frame (when bit 0 of CounterLow is reset) the door timer at DoorTimer is counted down. When it has reached zero, and the player is not in a doorway (see CheckDoorway), HandlerDoor_Toggle closes the door. Otherwise the door is just checked for being used as an exit (see HandlerDoorExit).
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| HandlerDoorOpen | 915F | LD A,($5E12) | Fetch the counter from CounterLow. | |||||
| 9162 | AND %00000001 | Keep only bit 0. | ||||||
| 9164 | JP NZ,HandlerDoorExit | Jump to HandlerDoorExit on every other frame. | ||||||
| 9167 | LD A,($5E2E) | Fetch the door timer from DoorTimer. | ||||||
| 916A | AND A | Test whether the door timer is zero. | ||||||
| 916B | JR Z,HandlerDoorOpen_CheckDoorway | Jump to HandlerDoorOpen_CheckDoorway if it is. | ||||||
| 916D | DEC A | Decrease the door timer by one. | ||||||
| 916E | LD ($5E2E),A | Update the door timer in DoorTimer. | ||||||
| 9171 | JP HandlerDoorExit | Jump to HandlerDoorExit to handle the exit of the door. | ||||||
| HandlerDoorOpen_CheckDoorway | 9174 | LD A,($5E2D) | Fetch the doorway flag from InDoorway. | |||||
| 9177 | AND A | Test whether the player is in a doorway. | ||||||
| 9178 | JP NZ,HandlerDoorExit | Jump to HandlerDoorExit if the player is. | ||||||
| 917B | JR HandlerDoor_Toggle | Jump to HandlerDoor_Toggle to restart the door timer and toggle both halves of the door. | ||||||
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