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64 lines
2.4 KiB
Python
64 lines
2.4 KiB
Python
from __future__ import annotations
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from datetime import datetime
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from typing import TYPE_CHECKING
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from game.utils import Distance, SPEED_OF_SOUND_AT_SEA_LEVEL, Speed, mach, meters
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if TYPE_CHECKING:
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from .flight import Flight
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from .package import Package
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class GroundSpeed:
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@classmethod
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def for_flight(cls, flight: Flight, altitude: Distance) -> Speed:
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# TODO: Expose both a cruise speed and target speed.
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# The cruise speed can be used for ascent, hold, join, and RTB to save
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# on fuel, but mission speed will be fast enough to keep the flight
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# safer.
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# DCS's max speed is in kph at 0 MSL.
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max_speed = flight.unit_type.max_speed
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if max_speed > SPEED_OF_SOUND_AT_SEA_LEVEL:
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# Aircraft is supersonic. Limit to mach 0.85 to conserve fuel and
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# account for heavily loaded jets.
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return mach(0.85, altitude)
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# For subsonic aircraft, assume the aircraft can reasonably perform at
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# 80% of its maximum, and that it can maintain the same mach at altitude
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# as it can at sea level. This probably isn't great assumption, but
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# might. be sufficient given the wiggle room. We can come up with
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# another heuristic if needed.
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cruise_mach = max_speed.mach() * (0.60 if flight.is_helo else 0.85)
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return mach(cruise_mach, altitude if not flight.is_helo else meters(0))
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# TODO: Most if not all of this should move into FlightPlan.
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class TotEstimator:
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def __init__(self, package: Package) -> None:
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self.package = package
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def earliest_tot(self, now: datetime) -> datetime:
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if not self.package.flights:
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return now
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return max(self.earliest_tot_for_flight(f, now) for f in self.package.flights)
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@staticmethod
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def earliest_tot_for_flight(flight: Flight, now: datetime) -> datetime:
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"""Estimate the earliest time the flight can reach the target position.
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The interpretation of the TOT depends on the flight plan type. See the various
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FlightPlan implementations for details.
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Args:
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flight: The flight to get the earliest TOT for.
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now: The current mission time.
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Returns:
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The earliest possible TOT for the given flight.
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"""
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flight_time = flight.flight_plan.minimum_duration_from_start_to_tot()
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return now + flight_time
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