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Routines |
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Used by the routines at guard_ew_move and upd_30_31_158_159.
The body's version of the facing logic in upd_144_to_149_152_to_157. Bit 0 of the type chooses one of the two drawings -- 30 or 31, 150 or 151, 158 or 159 -- and bit 6 of +7 mirrors it. +X and -Y set bit 0, -X and +Y clear it; +Y and -Y are mirrored. With both deltas 0 nothing changes, so a guard that stops keeps facing the way it was.
The dX and dY comparison is unsigned, as in upd_144_to_149_152_to_157.
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| set_guard_wizard_sprite | B76C | LD A,(IX+$09) | not moving: leave it | |
| B76F | OR (IX+$0A) | |||
| B772 | RET Z | |||
| B773 | LD A,(IX+$09) | moving along Y? | ||
| B776 | CP (IX+$0A) | |||
| B779 | JR C,guard_moving_in_y | |||
| B77B | BIT 7,A | moving -X? | ||
| B77D | JR NZ,guard_face_minus_x | |||
| B77F | SET 0,(IX+$00) | +X: bit 0 set | ||
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