|
Routines |
| Prev: AA01 | Up: Map | Next: AA27 |
|
Used by the routine at CheckMapObjectCollisions.
Makes the ship rebound after hitting something above or below it: the vertical speed of the ship is reversed and halved by ReverseAndHalveSpeed.
|
||||
| BounceVertically | AA15 | PUSH HL | Stash HL on the stack. | |
| AA16 | LD HL,($C8EE) | Fetch the word at C8EE into HL. | ||
| AA19 | CALL ReverseAndHalveSpeed | Call ReverseAndHalveSpeed. | ||
| AA1C | LD ($C8EE),HL | Update the high byte of the ship's vertical speed. | ||
| AA1F | LD A,H | A=H. | ||
| AA20 | LD H,L | H=L. | ||
| AA21 | LD L,A | L=A. | ||
| AA22 | CALL UpdateVerticalScrollSpeed | Call UpdateVerticalScrollSpeed. | ||
| AA25 | POP HL | Bring HL back off the stack. | ||
| AA26 | RET | Return. | ||
| Prev: AA01 | Up: Map | Next: AA27 |