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Routines |
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Used by the routine at MainGameLoop.
Move Percy left. Checks screen boundary and handles room transitions.
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| MovePercyLeft | 25216 | LD A,1 | Write 1 to *PercyFacingDirection (Percy is facing left). | |||||||
| 25218 | LD (24485),A | |||||||||
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If *CarryingWormFlag is set, apply an extra boundary check.
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| 25221 | LD A,(24490) | Jump to MovePercyLeft_Apply if *CarryingWormFlag is set. | ||||||||
| 25224 | OR A | |||||||||
| 25225 | JR Z,MovePercyLeft_Apply | |||||||||
| 25227 | LD A,(IX+0) | Load A with Percy's X position (*IX+0) - 5. | ||||||||
| 25230 | SUB 5 | |||||||||
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If Percy has gone past the left edge transition into the previous room.
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| 25232 | JP C,TransitionRoomLeft | Jump to TransitionRoomLeft if Percy's new position is less than 0 (transition to the previous room). | ||||||||
| 25235 | SUB D | Subtract the movement speed from Percy's X position. | ||||||||
| 25236 | JP C,TransitionRoomLeft | Jump to TransitionRoomLeft if Percy's new position is less than 0 (transition to the previous room). | ||||||||
| MovePercyLeft_Apply | 25239 | LD A,(IX+0) | Load A with Percy's X position (*IX+0) - the number of pixels to move (from D). | |||||||
| 25242 | SUB D | |||||||||
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If Percy has gone past the left edge transition into the previous room.
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| 25243 | JP C,TransitionRoomLeft | Jump to TransitionRoomLeft if Percy's new position is less than 0 (transition to the previous room). | ||||||||
| 25246 | LD (IX+0),A | Write Percy's updated X screen position back to *IX+0. | ||||||||
| 25249 | RET | Return. | ||||||||
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