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Routines |
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Used by the routine at ADJUST_PLYR_UVZ_FOR_ROOM_SIZE.
The code takes the room's doorways to be its first scenery entries, two pieces each, and each entry's second piece -- the first pillar, graphic 6 or 8, at the second record from the top and every other record down from there -- is what this looks at, until one is not an arch piece (graphics 6 to 9) or four have been tried. The one in the wall he comes in by (U or V at least 192 for a wall at the high end, below 64 for the low) gives him the middle of the arch along the wall and its Z; the body goes 12 above.
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| FIND_ENTRY_ARCH | CAEE | LD IY,ROOM_SECOND | Four doorways at most, two records apart | |||||||
| CAF2 | LD DE,$FFC0 | |||||||||
| CAF5 | LD B,$04 | |||||||||
| FIND_ENTRY_ARCH_0 | CAF7 | LD A,(IY+$00) | Not an arch piece: no more doorways | |||||||
| CAFA | SUB $06 | |||||||||
| CAFC | CP $04 | |||||||||
| CAFE | RET NC | |||||||||
| CAFF | LD A,C | Which wall | ||||||||
| CB00 | AND A | |||||||||
| CB01 | JR Z,ARCH_AT_HIGH_U | |||||||||
| CB03 | DEC A | |||||||||
| CB04 | JR Z,ARCH_AT_LOW_U | |||||||||
| CB06 | DEC A | |||||||||
| CB07 | JR Z,ARCH_AT_HIGH_V | |||||||||
| ARCH_AT_LOW_V | CB09 | LD A,(IY+$02) | Low V: an arch with V below 64 | |||||||
| CB0C | CP $40 | |||||||||
| CB0E | JR C,ALIGN_U_TO_ARCH | |||||||||
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This entry point is used by the routines at ARCH_AT_HIGH_U, ARCH_AT_LOW_U and ARCH_AT_HIGH_V.
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| NEXT_ARCH | CB10 | ADD IY,DE | The next doorway | |||||||
| CB12 | DJNZ FIND_ENTRY_ARCH_0 | |||||||||
| CB14 | RET | None in that wall: he keeps the U or V he left with | ||||||||
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