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Routines |
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Used by the routine at HandlePlayerLegs.
Moves the player by one frame. The speeds along x and y are only set up while the player walks, is jumping or is entering the room, and they are cleared again afterwards. The speed along z has gravity taken off it, which is more if the player is not rising with the jump control held down. If the player lands the jump is over.
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Set the walk speeds unless the player is turning.
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| MovePlayer | C61D | BIT 3,(IX+$0C) | Jump to MovePlayer_Walk to walk if the player is jumping. | |||||||
| C621 | JR NZ,MovePlayer_Walk | |||||||||
| C623 | LD A,(IX+$0C) | Fetch the collision flags. | ||||||||
| C626 | AND %11110000 | Keep only the countdown from entering the room. | ||||||||
| C628 | JR NZ,MovePlayer_Walk | Jump to MovePlayer_Walk to walk if the player has just entered the room. | ||||||||
| C62A | BIT 2,C | Jump to MovePlayer_Gravity if the player is not walking. | ||||||||
| C62C | JR Z,MovePlayer_Gravity | |||||||||
| MovePlayer_Walk | C62E | PUSH BC | Stash the controls on the stack. | |||||||
| C62F | CALL SetPlayerSpeed | Call SetPlayerSpeed to give the player a speed along x or y. | ||||||||
| C632 | POP BC | Restore the controls from the stack. | ||||||||
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Gravity takes one off the speed along z when the player is rising with the jump control held down, and two otherwise.
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| MovePlayer_Gravity | C633 | LD A,(IX+$0B) | Fetch the speed along the z axis. | |||||||
| C636 | AND A | Jump to MovePlayer_GravityFalling if the player is falling. | ||||||||
| C637 | JP M,MovePlayer_GravityFalling | |||||||||
| C63A | BIT 3,C | Jump to MovePlayer_GravityApply if the jump key is held down. | ||||||||
| C63C | JR NZ,MovePlayer_GravityApply | |||||||||
| MovePlayer_GravityFalling | C63E | DEC A | Decrement A. | |||||||
| MovePlayer_GravityApply | C63F | DEC A | Decrement A. | |||||||
| C640 | LD (IX+$0B),A | Store the speed along the z axis. | ||||||||
| C643 | LD ($A739),A | Set PreviousVerticalSpeed. | ||||||||
| C646 | ADD A,$02 | Add 02. | ||||||||
| C648 | CALL BlockMovement | Call BlockMovement to move the object, as far as it can go. | ||||||||
| C64B | CALL DoNothing | Call DoNothing. | ||||||||
| C64E | CALL ApplyGravityAndMove_AddSpeeds | Call ApplyGravityAndMove_AddSpeeds to add the distances that the player moved to the position of the player. | ||||||||
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Clear the jump flag when the player lands from a fall.
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| C651 | BIT 2,(IX+$0C) | Jump to MovePlayer_Done if the player is not on the ground. | ||||||||
| C655 | JR Z,MovePlayer_Done | |||||||||
| C657 | LD A,($A739) | Fetch PreviousVerticalSpeed. | ||||||||
| C65A | AND A | Jump to MovePlayer_Done if the player was not falling. | ||||||||
| C65B | JP P,MovePlayer_Done | |||||||||
| C65E | RES 3,(IX+$0C) | Clear the flag for jumping, as the player has landed. | ||||||||
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Clear the speeds along x and y.
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| MovePlayer_Done | C662 | XOR A | Write 00 to the speeds along x and y. | |||||||
| C663 | LD (IX+$09),A | |||||||||
| C666 | LD (IX+$0A),A | |||||||||
| C669 | RET | Return. | ||||||||
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View the equivalent code in;
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| Prev: C5D3 | Up: Map | Next: C66A |