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from __future__ import annotations
from dataclasses import dataclass
from enum import IntFlag
from typing import TYPE_CHECKING, List, Optional
from smarts.core.colors import SceneColors
from .actor import ActorState
if TYPE_CHECKING:
from smarts.core import coordinates
[docs]class SignalLightState(IntFlag):
"""States that a traffic signal light may take;
note that these may be combined into a bit-mask."""
UNKNOWN = 0
OFF = 0
STOP = 1
CAUTION = 2
GO = 4
FLASHING = 8
ARROW = 16
[docs]def signal_state_to_color(state: SignalLightState) -> SceneColors:
"""Maps a signal state to a color."""
if state == SignalLightState.STOP:
return SceneColors.SignalStop
elif state == SignalLightState.CAUTION:
return SceneColors.SignalCaution
elif state == SignalLightState.GO:
return SceneColors.SignalGo
else:
return SceneColors.SignalUnknown
[docs]@dataclass
class SignalState(ActorState):
"""Traffic signal state information."""
state: Optional[SignalLightState] = None
stopping_pos: Optional[coordinates.Point] = None
controlled_lanes: Optional[List[str]] = None
last_changed: Optional[float] = None # will be None if not known
def __post_init__(self):
assert self.state is not None