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Routines |
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The handler for the doors that are closed (sprite IDs 20 and 22 in HandlerTable2) and that open after a time, as made by RandomiseDoors. This is the same as HandlerDoorOpen, except that the door is shown (see HandlerRoomItem) instead of being used as an exit, there is no check for the player being in a doorway, and HandlerDoor_Toggle opens the door.
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| HandlerDoorClosed | 917D | LD A,($5E12) | Fetch the counter from CounterLow. | |||||
| 9180 | AND %00000001 | Keep only bit 0. | ||||||
| 9182 | JP NZ,HandlerRoomItem | Jump to HandlerRoomItem on every other frame. | ||||||
| 9185 | LD A,($5E2E) | Fetch the door timer from DoorTimer. | ||||||
| 9188 | AND A | Test whether the door timer is zero. | ||||||
| 9189 | JP Z,HandlerDoor_Toggle | Jump to HandlerDoor_Toggle if it is. | ||||||
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See Allow Doors To Open Quickly.
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| 918C | DEC A | Decrease the door timer by one. | ||||||
| 918D | LD ($5E2E),A | Update the door timer in DoorTimer. | ||||||
| 9190 | JP HandlerRoomItem | Jump to HandlerRoomItem to handle a room item that does nothing. | ||||||
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This entry point is used by the routine at HandlerDoorOpen.
Restart the door timer, and change both halves of the door from open to closed or the other way round. The door is erased and drawn again with a temporary attribute.
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| HandlerDoor_Toggle | 9193 | LD A,$5E | Restart the door timer by writing 5E to DoorTimer. | |||||
| 9195 | LD ($5E2E),A | |||||||
| 9198 | LD A,(IX+$05) | Fetch the attribute of the door. | ||||||
| 919B | PUSH AF | Stash it on the stack. | ||||||
| 919C | OR %00000011 | Set bits 0-1, which is temporary. | ||||||
| 919E | LD (IX+$05),A | Update the attribute of the door. | ||||||
| 91A1 | CALL DrawItemGraphic | Call DrawItemGraphic to erase the door. | ||||||
| 91A4 | LD A,(IX+$00) | Fetch the sprite ID of the door. | ||||||
| 91A7 | XOR %00000001 | Flip bit 0, which changes the door from open to closed or the other way round. | ||||||
| 91A9 | CALL SetDoorSprites | Call SetDoorSprites to write A to both halves of the door. | ||||||
| 91AC | CALL DrawItemGraphic | Call DrawItemGraphic to draw the door. | ||||||
| 91AF | POP AF | Restore the attribute of the door from the stack. | ||||||
| 91B0 | LD (IX+$05),A | Write it to the attribute of the door. | ||||||
| 91B3 | CALL UpdateDoorway | Call UpdateDoorway to set whether the doorway can be used. | ||||||
| 91B6 | CALL HandlerRoomItem | Call HandlerRoomItem to handle a room item that does nothing. | ||||||
| 91B9 | JP SoundsDoor | Jump to SoundsDoor to make the sound of a door. | ||||||
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