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Add mutate_level_retype: swap leaf types between storeys

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Cross-storey equivalent of mutate_retype. Directly addresses
level-constraint failures ("l1 on wrong level") by moving a room type
from one floor to another without changing topology or geometry.

Registered in MUTATIONS at default weight (1.0); no drastic geometry
perturbation so it does not need the reduced level_add/delete weight.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Bruno Postle 2026-06-14 10:52:48 +01:00
parent 517a825505
commit 507cf82d99
1 changed files with 23 additions and 0 deletions
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23
src/homemaker_layout/operators.py
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@ -122,6 +122,28 @@ def mutate_rotate(root: dom.Node, rng: np.random.Generator,
return _finalise(child), f"rotate {li}/{n.id or 'root'}"
def mutate_level_retype(root: dom.Node, rng: np.random.Generator,
types: list[str]) -> tuple[dom.Node, str]:
"""Swap the types of two leaves on different storeys.
The cross-storey equivalent of mutate_retype; directly addresses
level-constraint failures (e.g. "l1 on wrong level") by moving a room
type from one floor to another without changing topology or geometry.
"""
child = copy.deepcopy(root)
lvls = dom.levels(child)
if len(lvls) < 2:
return _finalise(child), "level_retype noop"
all_lv = _leaves(child)
li_a, a = _pick(rng, all_lv)
other = [(li, lf) for li, lf in all_lv if li != li_a]
if not other:
return _finalise(child), "level_retype noop"
li_b, b = _pick(rng, other)
a.type, b.type = b.type, a.type
return _finalise(child), f"level_retype {li_a}/{a.id or 'root'}<->{li_b}/{b.id or 'root'}"
def mutate_level_add(root: dom.Node, rng: np.random.Generator,
types: list[str]) -> tuple[dom.Node, str]:
from . import genome as _g
@ -158,6 +180,7 @@ MUTATIONS = {
"retype": mutate_retype,
"swap": mutate_swap,
"rotate": mutate_rotate,
"level_retype": mutate_level_retype,
"level_add": mutate_level_add,
"level_delete": mutate_level_delete,
}