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Routines |
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Used by the routine at Handle_Carrying_Eagle.
Deals with an eagle that has moved to a new y position that is outside the main part of the room.
The first entry point is for a y position of less than 80 (at the top of the room) and the second (Limit_Eagle_Vertical_Movement_Bottom_Gap) for a y position of 9F or more in a room that has no floor. The eagle bounces off a ceiling, flies through the gaps in the frame of the room and goes into the next room when it reaches the edge.
A gap sets bits 2 and 6 of the contact flags, so that the eagle bounces off it like it would off a wall.
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| Limit_Eagle_Vertical_Movement | E496 | CP $4C | Jump to Handle_Carrying_Eagle_Store_Y to store the y position if it is 4C or more. | |||||||||
| E498 | JP NC,Handle_Carrying_Eagle_Store_Y | |||||||||||
| E49B | BIT 0,E | Jump to Limit_Eagle_Vertical_Movement_Top_Gap if the room has no ceiling. | ||||||||||
| E49D | JP Z,Limit_Eagle_Vertical_Movement_Top_Gap | |||||||||||
| E4A0 | LD A,(IX+$09) | Fetch the y velocity. | ||||||||||
| E4A3 | CPL | Invert it. | ||||||||||
| E4A4 | LD (IX+$09),A | Store the y velocity. | ||||||||||
| E4A7 | CALL Choose_Eagle_Target | Choose a new target. | ||||||||||
| E4AA | LD A,$4C | Set the y position to 4C. | ||||||||||
| E4AC | JP Handle_Carrying_Eagle_Store_Y | Jump to Handle_Carrying_Eagle_Store_Y. | ||||||||||
| Limit_Eagle_Vertical_Movement_Top_Gap | E4AF | CP $28 | Jump to Limit_Eagle_Vertical_Movement_In_Gap if the y position is 28 or more, as the eagle is in the gap. | |||||||||
| E4B1 | JR NC,Limit_Eagle_Vertical_Movement_In_Gap | |||||||||||
| E4B3 | JP Move_Eagle_To_Next_Room | Jump to Move_Eagle_To_Next_Room to move the eagle into the next room above. | ||||||||||
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This entry point is used by the routine at Handle_Carrying_Eagle.
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| Limit_Eagle_Vertical_Movement_Bottom_Gap | E4B6 | CP $AF | Jump to Limit_Eagle_Vertical_Movement_In_Gap if the y position is less than AF as the eagle is in the gap. | |||||||||
| E4B8 | JR C,Limit_Eagle_Vertical_Movement_In_Gap | |||||||||||
| E4BA | JP Move_Eagle_To_Room_Below | Jump to Move_Eagle_To_Room_Below to move the eagle into the next room below. | ||||||||||
| Limit_Eagle_Vertical_Movement_In_Gap | E4BD | EX AF,AF' | Save the y position. | |||||||||
| E4BE | LD A,(IX+$0B) | Fetch the contact flags. | ||||||||||
| E4C1 | OR %01000100 | Set bits 2 and 6. | ||||||||||
| E4C3 | LD (IX+$0B),A | Store the contact flags. | ||||||||||
| E4C6 | EX AF,AF' | Restore the y position. | ||||||||||
| E4C7 | JP Handle_Carrying_Eagle_Store_Y | Jump to Handle_Carrying_Eagle_Store_Y to store the y position. | ||||||||||
| Prev: E45F | Up: Map | Next: E4CA |