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Routines |
| Prev: B3E8 | Up: Map | Next: B4C2 |
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Tick the sprite delay, move the debris and, once the thrust reaches 01, play SquareWave_Loop and become type E7.
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Reload the delay from *IX+11 when it expires.
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| Handler_FallingSprite | B460 | DEC (IX+$10) | Decrease *IX+10 by one. | |||||
| B463 | JR NZ,Handler_FallingSprite_CycleType | Jump to Handler_FallingSprite_CycleType if it is not zero. | ||||||
| B465 | LD A,(IX+$11) | A=*IX+11. | ||||||
| B468 | LD (IX+$10),A | Write A to *IX+10. | ||||||
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Increase the thrust and land once it reaches 01.
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| B46B | INC (IX+$06) | Increment *IX+06 by one. | ||||||
| B46E | LD A,(IX+$06) | A=*IX+06. | ||||||
| B471 | CP $01 | Compare A with 01. | ||||||
| B473 | JR Z,Handler_FallingSprite_Land | Jump to Handler_FallingSprite_Land if they are equal. | ||||||
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Step the type (E6 becomes E7, else reset to E4), then move.
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| Handler_FallingSprite_CycleType | B475 | LD A,(IX+$00) | A=*IX+00. | |||||
| B478 | INC A | Increment A by one. | ||||||
| B479 | CP $E7 | Compare A with E7. | ||||||
| B47B | JR NC,Handler_FallingSprite_MoveDown | Jump to Handler_FallingSprite_MoveDown if A is E7 or higher. | ||||||
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""Explosion: Frame 5"".
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| B47D | LD A,$E4 | A=E4. | ||||||
| Handler_FallingSprite_MoveDown | B47F | LD (IX+$00),A | Write A to *IX+00. | |||||
| B482 | CALL MoveBySpeed | Call MoveBySpeed. | ||||||
| B485 | LD (IX+$04),A | Write A to *IX+04. | ||||||
| B488 | JP DrawCurrentActor_Draw | Jump to DrawCurrentActor_Draw. | ||||||
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Play SquareWave_Loop and become type E7.
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| Handler_FallingSprite_Land | B48B | LD C,(IX+$04) | C=*IX+04. | |||||
| B48E | LD D,$04 | D=04. | ||||||
| B490 | CALL SquareWave_Loop | Call SquareWave_Loop. | ||||||
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""Explosion: Frame 8"".
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| B493 | LD (IX+$00),$E7 | Write E7 to *IX+00. | ||||||
| B497 | JP DrawCurrentActor_Draw | Jump to DrawCurrentActor_Draw. | ||||||
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Step the type on and redraw.
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| Handler_FallingSprite_StepType | B49A | INC (IX+$00) | Increase the actor type by one. | |||||
| B49D | JP DrawCurrentActor_Draw | Jump to DrawCurrentActor_Draw. | ||||||
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Flip the type every eighth frame, then drop.
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| Handler_FallingSprite_FlipType | B4A0 | LD A,($5E42) | Fetch GameTimer. | |||||
| B4A3 | AND %00000111 | Keep only bits 0-2. | ||||||
| B4A5 | JR NZ,Handler_FallingSprite_IncreaseY | Jump to Handler_FallingSprite_IncreaseY if the result is not zero. | ||||||
| B4A7 | LD A,(IX+$00) | Fetch the actor type. | ||||||
| B4AA | XOR %00000001 | Flip bit 0. | ||||||
| B4AC | LD (IX+$00),A | Write it back. | ||||||
| Handler_FallingSprite_IncreaseY | B4AF | INC (IX+$04) | Increase the actor Y by one. | |||||
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Remove the sprite once it reaches the ground line.
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| B4B2 | LD A,(IX+$04) | Fetch the actor Y. | ||||||
| B4B5 | CP $AF | Jump to DrawCurrentActor_Draw if it is still above the ground line. | ||||||
| B4B7 | JP C,DrawCurrentActor_Draw | |||||||
| B4BA | CALL DrawCachedSprite | Call DrawCachedSprite. | ||||||
| B4BD | LD (IX+$00),$00 | Write 00 to the actor type. | ||||||
| B4C1 | RET | Return. | ||||||
| Prev: B3E8 | Up: Map | Next: B4C2 |