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Routines |
| Prev: 27352 | Up: Map | Next: 27508 |
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Used by the routine at 27136.
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| 27357 | XOR A | Set A to zero | ||
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This entry point is used by the routine at 27352.
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| 27358 | LD (27393),A | Prepare to set Magic Knight's x-velocity to A | ||
| 27361 | LD HL,37087 | Point HL at end of table of y-velocities sequence for jumping and falling | ||
| 27364 | LD (37072),HL | Store current position at 37072 | ||
| 27367 | LD A,(23474) | If Magic Knight's movement flags are reset... | ||
| 27370 | OR A | ... | ||
| 27371 | JR Z,27377 | ...then skip ahead to 27377 | ||
| 27373 | XOR A | Prepare to set Magic Knight's x-velocity to zero... | ||
| 27374 | LD (27393),A | ... | ||
| 27377 | LD HL,(37072) | Load current position in y-velocities table into HL | ||
| 27380 | LD A,(HL) | Load current y-velocity from table into A | ||
| 27381 | CP 7 | If velocity is 7... | ||
| 27383 | JR Z,27389 | ...then skip ahead to 27389 | ||
| 27385 | DEC HL | Step pointer back one byte in y-velocities table | ||
| 27386 | LD (37072),HL | Store pointer | ||
| 27389 | LD (25161),A | Load last y-velocity read from table into Magic Knight's y-velocity | ||
| 27392 | LD A,0 | Set Magic Knight's x-velocity... | ||
| 27394 | LD (25160),A | ... | ||
| 27397 | LD A,(25156) | Load A with Magic Knight's current x-coordinate (pixels) | ||
| 27400 | ADD A,4 | Add 4 to x-coordinate | ||
| 27402 | CALL 28625 | Divide x-coordinate by eight, rounding down to nearest integer | ||
| 27405 | LD C,A | Load result (Magic Knight's x-coordinate in characters) into C, setting B to zero... | ||
| 27406 | LD B,0 | ... | ||
| 27408 | LD A,(25157) | Load A with Magic Knight's current y-coordinate (pixels) | ||
| 27411 | AND 7 | If y-coordinate is a multiple of eight... | ||
| 27413 | JR Z,27417 | ...then skip ahead to 27417 | ||
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y-coordinate is not a multiple of eight
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| 27415 | LD B,8 | Set B to 8, as we need to look one character block lower due to Magic Knight spanning five, rather than four, characters | ||
| 27417 | LD A,(25157) | Load A with Magic Knight's current y-coordinate (pixels) | ||
| 27420 | ADD A,B | Add B to current y-coordinate (i.e. y-coordinate of highest full character block spanned by Magic Knight) | ||
| 27421 | ADD A,32 | Add 32 (as Magic Knight is 32 pixels high, so now y-coordinate of highest full character block not occupied by Magic Knight) | ||
| 27423 | CALL 28625 | Divide A by eight, rounding down to nearest integer | ||
| 27426 | LD B,A | Load result (y-coordinate in characters) into B | ||
| 27427 | CALL 54162 | Point HL at terrain interaction data for character coordinates x=C, y=B (block that Magic Knight is "falling through") | ||
| 27430 | LD A,(HL) | If this block, or the one to the right of it cannot be passed vertically (downwards)... | ||
| 27431 | INC HL | ...(i.e. Magic Knight has landed)... | ||
| 27432 | OR (HL) | ... | ||
| 27433 | BIT 7,A | ... | ||
| 27435 | JR NZ,27476 | ...then skip ahead to 27476 | ||
| 27437 | CALL 27508 | Kill Magic Knight's x-velocity if he cannot horizontally pass through a block beside him | ||
| 27440 | LD A,(25160) | Load Magic Knight's x-velocity into B... | ||
| 27443 | LD B,A | ... | ||
| 27444 | LD A,(23474) | Load Magic Knight's movement flags into A | ||
| 27447 | XOR B | Check: | ||
| 27448 | CP 255 | If x-velocity is -2 (left), and Magic Knight can't move left... | ||
| 27450 | JP Z,27498 | ...then jump ahead to 27498 | ||
| 27453 | CP 253 | If x-velocity is -2 (left), and Magic Knight can't move left or right... | ||
| 27455 | JP Z,27498 | ...then jump ahead to 27498 | ||
| 27458 | CP 1 | If x-velocity is +2 (right), and Magic Knight can't move left or right... | ||
| 27460 | JP Z,27498 | ...then jump ahead to 27498 | ||
| 27463 | OR A | If x-velocity is +2 (right), and Magic Knight can't move right... | ||
| 27464 | JP Z,27498 | ...then jump ahead to 27498 | ||
| 27467 | CALL 53115 | Erase Magic Knight from display, advance his current position then redraw | ||
| 27470 | CALL 28457 | Set Magic Knight's velocity to zero, if appropriate move to new room, execute room-specific routine | ||
| 27473 | JP 27367 | Loop back to 27367 | ||
| 27476 | LD A,(25157) | Load A with Magic Knight's current y-coordinate (pixels) | ||
| 27479 | AND 7 | Retain only pixel-within-character component (e.g. 5 pixels down the pair of character blocks) | ||
| 27481 | NEG | Negate (i.e. -5 pixels) | ||
| 27483 | AND 7 | Retain only pixel-within-character component (e.g. 3 pixels up the pair of character blocks, or 3 pixels down to the ground) | ||
| 27485 | LD (25161),A | Set Magic Knight's y-velocity so that it will take his feet to the ground | ||
| 27488 | CALL 53115 | Erase Magic Knight from display, advance his current position then redraw | ||
| 27491 | LD HL,0 | Set Magic Knight's x- and y-velocities to zero... | ||
| 27494 | LD (25160),HL | ... | ||
| 27497 | RET | Return (Magic Knight has landed) | ||
| 27498 | XOR A | Set Magic Knight's x-velocity to zero... | ||
| 27499 | LD (25160),A | ... | ||
| 27502 | LD (27393),A | Prepare to set Magic Knight's x-velocity to zero | ||
| 27505 | JP 27467 | Loop back to 27467 | ||
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