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Routines |
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Used by the routine at CheckMapObjectCollisions.
Makes the ship rebound after hitting something to its left or right: the horizontal speed of the ship is reversed and halved by ReverseAndHalveSpeed, and the horizontal scroll speed is negated.
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| BounceHorizontally | 43521 | PUSH HL | Stash HL on the stack. | |
| 43522 | LD HL,(51436) | Fetch the word at 51436 into HL. | ||
| 43525 | CALL ReverseAndHalveSpeed | Call ReverseAndHalveSpeed. | ||
| 43528 | LD (51436),HL | Update the high byte of the ship's horizontal speed. | ||
| 43531 | POP HL | Bring HL back off the stack. | ||
| 43532 | LD A,(52411) | The horizontal scroll speed. | ||
| 43535 | NEG | Negate A. | ||
| 43537 | LD (52411),A | Update the horizontal scroll speed. | ||
| 43540 | RET | Return. | ||
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