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Routines |
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Add the actor's horizontal speed to its world X and return the Y plus thrust in A.
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Add the actor's horizontal speed to its world X.
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| MoveBySpeed | B6AE | LD A,(IX+$05) | Copy the actor speed into C. | |||||
| B6B1 | LD C,A | |||||||
| B6B2 | LD B,$00 | Clear B. | ||||||
| B6B4 | AND A | Jump to MoveBySpeed_AddWorldX if the speed is positive. | ||||||
| B6B5 | JP P,MoveBySpeed_AddWorldX | |||||||
| B6B8 | DEC B | Sign-extend the speed into BC. | ||||||
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Add the sign-extended speed to the world X and wrap it.
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| MoveBySpeed_AddWorldX | B6B9 | LD L,(IX+$02) | Fetch the actor world X. | |||||
| B6BC | LD H,(IX+$03) | Fetch the high byte. | ||||||
| B6BF | CALL MaskWorldX | Call MaskWorldX. | ||||||
| B6C2 | LD (IX+$02),L | Write the wrapped low byte back. | ||||||
| B6C5 | LD (IX+$03),H | Write the wrapped high byte back. | ||||||
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Return the actor Y plus its thrust.
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| B6C8 | LD A,(IX+$04) | Fetch the actor Y. | ||||||
| B6CB | ADD A,(IX+$06) | Add the actor thrust. | ||||||
| B6CE | RET | Return. | ||||||
| Prev: B699 | Up: Map | Next: B6CF |