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Routines |
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For a doorway in a wall of constant U: nothing if the robot faces along V (his legs mirrored) or is on the middle line already, otherwise +1 or -1 into +$0F of his legs, towards it, which the walk (CALC_PLYR_DUV) adds to his step in V when he next walks. This is why he slides into line with a doorway as he walks through.
Only while he faces through the doorway: Knight Lore (adj_ew) and Pentagram (NUDGE_ALONG_V) nudge whichever way he faces.
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| NUDGE_ALONG_V | C050 | BIT 6,(IY+$07) | facing along V: no nudge | |||||||
| C054 | JR NZ,NUDGE_DONE | |||||||||
| C056 | LD A,(IX+$0A) | on the middle line already | ||||||||
| C059 | CP (IY+$02) | |||||||||
| C05C | JR Z,NUDGE_DONE | |||||||||
| C05E | LD A,$01 | +1 if the middle is at a greater V, else -1 | ||||||||
| C060 | JR NC,NUDGE_ALONG_V_0 | |||||||||
| C062 | NEG | |||||||||
| NUDGE_ALONG_V_0 | C064 | LD (IY+$0F),A | the V nudge | |||||||
| C067 | JR NUDGE_DONE | |||||||||
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