|
Routines |
| Prev: 36804 | Up: Map | Next: 36875 |
|
Used by the routine at ApplyCollisionEffects.
Bounces the player's ship off an object, by exchanging half of the speed of each of them.
|
||||||||||
| BounceShip | 36810 | LD D,(IY+25) | Fetch the horizontal speed of the player into DE. | |||||||
| 36813 | LD E,(IY+26) | |||||||||
| 36816 | LD H,(IX+7) | Fetch the horizontal speed of the object into HL. | ||||||||
| 36819 | LD L,(IX+8) | |||||||||
| 36822 | SRA H | Halve it. | ||||||||
| 36824 | RR L | |||||||||
| 36826 | CALL NegateNumber | Negate it. | ||||||||
| 36829 | LD (IX+7),H | Store it as the new speed of the object. | ||||||||
| 36832 | LD (IX+8),L | |||||||||
| 36835 | ADD HL,DE | Add the speed of the player. | ||||||||
| 36836 | LD (IY+25),H | Store the result as the new speed of the player. | ||||||||
| 36839 | LD (IY+26),L | |||||||||
| 36842 | LD D,(IY+27) | Fetch the vertical speed of the player into DE. | ||||||||
| 36845 | LD E,(IY+28) | |||||||||
| 36848 | LD H,(IX+9) | Fetch the vertical speed of the object into HL. | ||||||||
| 36851 | LD L,(IX+10) | |||||||||
| 36854 | SRA H | Halve it. | ||||||||
| 36856 | RR L | |||||||||
| 36858 | CALL NegateNumber | Negate it. | ||||||||
| 36861 | LD (IX+9),H | Store it as the new speed of the object. | ||||||||
| 36864 | LD (IX+10),L | |||||||||
| 36867 | ADD HL,DE | Add the speed of the player. | ||||||||
| 36868 | LD (IY+27),H | Store the result as the new speed of the player. | ||||||||
| 36871 | LD (IY+28),L | |||||||||
| 36874 | RET | Return. | ||||||||
| Prev: 36804 | Up: Map | Next: 36875 |