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Routines |
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Used by the routine at PLAYER_LEGS.
The player steps forward when walk is held, and also without it during a jump and during the walk into a room: 3 units in the way he faces, plus any nudge an arch has left him (CALC_PLYR_DUV). Then gravity: 2 off the Z step every turn, or 1 while he is still rising (or level) with jump held, so that holding jump jumps higher. The Z step is kept in Z_STEP before ADJ_FOR_OUT_OF_BOUNDS cuts the move short against the floor, the walls and the other objects, and then the move is made. A move down that was stopped (bit 2 of +$0C) is a landing, and ends the jump.
Knight Lore's routine is the same with two calls taken out: the falling sound (the ADD A,2 before the collision code is its test, and nothing reads it now) and the check for walking out of the room, which here is an empty routine (EXIT_STUB) because Pentagram's arches do that themselves (HANDLE_EXIT_SCREEN).
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| MOVE_PLAYER | C61D | BIT 3,(IX+$0C) | Jumping: forward | |||||||
| C621 | JR NZ,MOVE_PLAYER_0 | |||||||||
| C623 | LD A,(IX+$0C) | Walking into a room: forward | ||||||||
| C626 | AND $F0 | |||||||||
| C628 | JR NZ,MOVE_PLAYER_0 | |||||||||
| C62A | BIT 2,C | Walk not held: no step | ||||||||
| C62C | JR Z,MOVE_PLAYER_1 | |||||||||
| MOVE_PLAYER_0 | C62E | PUSH BC | A step forward, the controls kept | |||||||
| C62F | CALL CALC_PLYR_DUV | |||||||||
| C632 | POP BC | |||||||||
| MOVE_PLAYER_1 | C633 | LD A,(IX+$0B) | Z step negative: falling, two off | |||||||
| C636 | AND A | |||||||||
| C637 | JP M,MOVE_PLAYER_2 | |||||||||
| C63A | BIT 3,C | Rising or level with jump held: one off | ||||||||
| C63C | JR NZ,MOVE_PLAYER_3 | |||||||||
| MOVE_PLAYER_2 | C63E | DEC A | Gravity: two off, or one | |||||||
| MOVE_PLAYER_3 | C63F | DEC A | ||||||||
| C640 | LD (IX+$0B),A | The new Z step, and a copy that says afterwards which way he was going | ||||||||
| C643 | LD (Z_STEP),A | |||||||||
| C646 | ADD A,$02 | Left over from Knight Lore's falling sound: nothing reads A | ||||||||
| C648 | CALL ADJ_FOR_OUT_OF_BOUNDS | Cut the move short where it must be | ||||||||
| C64B | CALL EXIT_STUB | Knight Lore's exit check, now a RET | ||||||||
| C64E | CALL ADD_DUVZ | U, V and Z plus the steps | ||||||||
| C651 | BIT 2,(IX+$0C) | Stopped while moving down? | ||||||||
| C655 | JR Z,MOVE_PLAYER_4 | |||||||||
| C657 | LD A,(Z_STEP) | |||||||||
| C65A | AND A | |||||||||
| C65B | JP P,MOVE_PLAYER_4 | |||||||||
| C65E | RES 3,(IX+$0C) | Then landed: the jump is over | ||||||||
| MOVE_PLAYER_4 | C662 | XOR A | The U and V steps are one turn's; the Z step carries over as the speed | |||||||
| C663 | LD (IX+$09),A | |||||||||
| C666 | LD (IX+$0A),A | |||||||||
| C669 | RET | |||||||||
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