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Routines |
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The body of a guard_square guard (guard_square), and the wizard (wizard). Each frame it moves with the deltas it already has, then picks its next deltas from whether that move was blocked: it walks two units a frame in a straight line until it hits something, then turns a quarter and carries on. The turns always go the same way round, -X, +Y, +X, -Y, so it follows the walls of the room. It is deadly to touch.
Its legs are the next record: they get its X, Y, dX and dY every frame.
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| upd_30_31_158_159 | B9A5 | CALL adj_p3_m12 | pixel offsets: 9 pixels above the legs | |
| B9A8 | CALL dec_dZ_and_update_XYZ | gravity and move | ||
| B9AB | CALL move_guard_wizard_NSEW | the next heading, in H (dY) and L (dX) | ||
| B9AE | LD (IX+$09),L | set its deltas and the legs' | ||
| B9B1 | LD (IX+$29),L | |||
| B9B4 | LD (IX+$0A),H | |||
| B9B7 | LD (IX+$2A),H | |||
| B9BA | LD A,(IX+$01) | the legs go where it went | ||
| B9BD | LD (IX+$21),A | |||
| B9C0 | LD A,(IX+$02) | |||
| B9C3 | LD (IX+$22),A | |||
| B9C6 | CALL set_guard_wizard_sprite | choose its frame and mirroring | ||
| B9C9 | JP set_deadly_wipe_and_draw_flags | deadly, wipe and draw | ||
| Prev: B99F | Up: Map | Next: B9CC |