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Routines |
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Used by the routine at InitialiseGame.
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| Handler_DisappearingFloors | 58753 | LD IX,(23526) | Point IX at *ReferenceDisappearingFloors. | |
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Walk the disappearing-floor table.
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| Handler_DisappearingFloors_Loop | 58757 | LD A,(IX+0) | Return if this floor entry is the terminator (255). | |
| 58760 | CP 255 | |||
| 58762 | RET Z | |||
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Bit 7 of the width byte holds whether the floor is visible.
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| 58763 | LD A,(IX+2) | A=this floor's width and visibility state. | ||
| 58766 | AND %10000000 | Keep only the visibility state. | ||
| 58768 | JP Z,DisplayFloor | Jump to DisplayFloor if the floor is currently visible. | ||
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The floor is hidden; print empty space from Graphics_MaskSprite.
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| 58771 | LD HL,40812 | Write 40812 to *CHARS. | ||
| 58774 | LD (23606),HL | |||
| 58777 | INC (IX+5) | Advance this floor's change timer. | ||
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Stay hidden until the disappeared-timer count elapses.
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| 58780 | LD A,(IX+4) | Jump to PrintDisappearedFloor if the hidden timer has not elapsed. | ||
| 58783 | CP (IX+5) | |||
| 58786 | JR NZ,PrintDisappearedFloor | |||
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Time to bring the floor back.
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| 58788 | LD A,(IX+2) | A=this floor's width and visibility state. | ||
| 58791 | AND %01111111 | Clear the hidden state so the floor will show next cycle. | ||
| 58793 | LD (IX+2),A | Write the updated width and state back. | ||
| 58796 | LD (IX+5),0 | Reset this floor's change timer. | ||
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Print blank tiles where the floor should be. The visible path at PrintVisibleFloor also updates the room buffer.
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| PrintDisappearedFloor | 58800 | LD C,(IX+0) | C=the floor's horizontal co-ordinate. | |
| 58803 | LD B,(IX+1) | B=the floor's vertical co-ordinate. | ||
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Bits 0-6 hold the floor width.
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| 58806 | LD A,(IX+2) | A=this floor's width and visibility state. | ||
| 58809 | AND %01111111 | Keep only the width. | ||
| 58811 | LD E,A | E=the floor width. | ||
| 58812 | LD D,1 | D=1 (floors are one row high). | ||
| 58814 | LD A,32 | A=a blank tile. | ||
| 58816 | CALL PrintSprite | Print the empty floor space. | ||
| 58819 | JR DisappearingFloors_Next | Jump to DisappearingFloors_Next. | ||
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The floor is visible; count down until it should vanish.
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| DisplayFloor | 58821 | LD A,(IX+3) | Fetch how long this floor stays visible. | |
| 58824 | INC (IX+5) | Advance this floor's change timer. | ||
| 58827 | CP (IX+5) | Jump to PrintVisibleFloor if the visible timer has not elapsed. | ||
| 58830 | JR NZ,PrintVisibleFloor | |||
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Time to hide the floor.
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| 58832 | LD A,(IX+2) | A=this floor's width and visibility state. | ||
| 58835 | OR %10000000 | Set the hidden state so the floor will vanish next cycle. | ||
| 58837 | LD (IX+2),A | Write the updated width and state back. | ||
| 58840 | LD (IX+5),0 | Reset this floor's change timer. | ||
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Draw the floor and update the room buffer.
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| PrintVisibleFloor | 58844 | LD C,(IX+0) | C=the floor's horizontal co-ordinate. | |
| 58847 | LD B,(IX+1) | B=the floor's vertical co-ordinate. | ||
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Bits 0-6 hold the floor width.
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| 58850 | LD A,(IX+2) | A=this floor's width and visibility state. | ||
| 58853 | AND %01111111 | Keep only the width. | ||
| 58855 | LD E,A | E=the floor width. | ||
| 58856 | LD D,1 | D=1 (floors are one row high). | ||
| 58858 | CALL PrintSpriteUpdateBuffer | Print the floor and update the room buffer. | ||
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Move onto the next disappearing floor.
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| DisappearingFloors_Next | 58861 | LD DE,6 | Move IX on to the next six-byte floor entry. | |
| 58864 | ADD IX,DE | |||
| 58866 | JR Handler_DisappearingFloors_Loop | Jump to Handler_DisappearingFloors_Loop. | ||
| Prev: 58609 | Up: Map | Next: 58868 |