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Routines |
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Used by the routines at BuildView and ScrollViewLeft.
Adds an amount to the origin of the view, which is held in ViewPosition, 23780 and ViewOriginSum, and changes the scroll position at DrawingFlags to suit.
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| AdjustViewOrigin | 51614 | LD D,0 | The amount is a single byte. | |||||||
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This entry point is used by the routines at BuildView and ScrollViewRight.
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| AdjustViewOrigin_Signed | 51616 | LD HL,(23778) | Add the amount to the first origin. | |||||||
| 51619 | ADD HL,DE | |||||||||
| 51620 | LD (23778),HL | |||||||||
| 51623 | LD HL,(23780) | Add the amount to the second origin. | ||||||||
| 51626 | ADD HL,DE | |||||||||
| 51627 | LD (23780),HL | |||||||||
| 51630 | LD HL,(23783) | Add the amount twice to the view origin. | ||||||||
| 51633 | ADD HL,DE | |||||||||
| 51634 | ADD HL,DE | |||||||||
| 51635 | LD (23783),HL | |||||||||
| 51638 | LD A,(23792) | The scroll flags move the other way, by twice the amount. | ||||||||
| 51641 | LD B,A | |||||||||
| 51642 | LD A,E | |||||||||
| 51643 | NEG | |||||||||
| 51645 | ADD A,A | |||||||||
| 51646 | ADD A,B | |||||||||
| 51647 | LD (23792),A | |||||||||
| 51650 | RET | Return. | ||||||||
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