source: src/mlx/fs.py@ 152:f0701a18628a

# Module for generic flight-simulator interfaces

#-------------------------------------------------------------------------------

import const
from sound import startSound

import fsuipc
import threading
import time

#-------------------------------------------------------------------------------

class ConnectionListener(object):
    """Base class for listeners on connections to the flight simulator."""
    def connected(self, fsType, descriptor):
        """Called when a connection has been established to the flight
        simulator of the given type."""
        print "fs.ConnectionListener.connected, fsType:", fsType, ", descriptor:", descriptor

    def connectionFailed(self):
        """Called when the connection could not be established."""
        print "fs.ConnectionListener.connectionFailed"        

    def disconnected(self):
        """Called when a connection to the flight simulator has been broken."""
        print "fs.ConnectionListener.disconnected"

#-------------------------------------------------------------------------------

class SimulatorException(Exception):
    """Exception thrown by the simulator interface for communication failure."""

#-------------------------------------------------------------------------------

def createSimulator(type, connectionListener):
    """Create a simulator instance for the given simulator type with the given
    connection listener.

    The returned object should provide the following members:
    FIXME: add info
    """
    assert type in [const.SIM_MSFS9, const.SIM_MSFSX], \
           "Only MS Flight Simulator 2004 and X are supported"
    return fsuipc.Simulator(connectionListener, connectAttempts = 3)

#-------------------------------------------------------------------------------

class MessageThread(threading.Thread):
    """Thread to handle messages."""
    def __init__(self, config, simulator):
        """Initialize the message thread with the given configuration and
        simulator."""
        super(MessageThread, self).__init__()

        self._config = config
        self._simulator = simulator

        self._requestCondition = threading.Condition()
        self._messages = []
        self._nextMessageTime = None
        self._toQuit = False

        self.daemon = True

    def add(self, messageType, text, duration, disconnect):
        """Add the given message to the requested messages."""
        with self._requestCondition:
            self._messages.append((messageType, text, duration,
                                   disconnect))
            self._requestCondition.notify()

    def quit(self):
        """Quit the thread."""
        with self._requestCondition:
            self._toQuit = True
            self._requestCondition.notifty()
        self.join()

    def run(self):
        """Perform the thread's operation."""
        while True:
            (messageType, text, duration, disconnect) = (None, None, None, None)
            with self._requestCondition:
                now = time.time()
                while not self._toQuit and \
                      ((self._nextMessageTime is not None and \
                        self._nextMessageTime>now) or \
                       not self._messages):
                    self._requestCondition.wait(1)
                    now = time.time()

                if self._toQuit: return
                if self._nextMessageTime is None or \
                   self._nextMessageTime<=now:
                    self._nextMessageTime = None

                    if self._messages:
                        (messageType, text,
                         duration, disconnect) = self._messages[0]
                        del self._messages[0]

            if text is not None:        
                self._sendMessage(messageType, text, duration, disconnect)

    def _sendMessage(self, messageType, text, duration, disconnect):
        """Send the message and setup the next message time."""
        messageLevel = self._config.getMessageTypeLevel(messageType)
        if messageLevel==const.MESSAGELEVEL_SOUND or \
           messageLevel==const.MESSAGELEVEL_BOTH:
            startSound(const.SOUND_DING)
        if (messageLevel==const.MESSAGELEVEL_FS or \
            messageLevel==const.MESSAGELEVEL_BOTH):
            if disconnect:
                self._simulator.disconnect("[MLX] " + text,
                                           duration = duration)
            else:
                self._simulator.sendMessage("[MLX] " + text,
                                            duration = duration)
        elif disconnecte:
            self._simulator.disconnect()
        self._nextMessageTime = time.time() + duration

#-------------------------------------------------------------------------------

_messageThread = None

#-------------------------------------------------------------------------------

def setupMessageSending(config, simulator):
    """Setup message sending with the given config and simulator."""
    global _messageThread
    if _messageThread is not None:
        _messageThread.quit()
    _messageThread = MessageThread(config, simulator)
    _messageThread.start()

#-------------------------------------------------------------------------------

def sendMessage(messageType, text, duration = 3, disconnect = False):
    """Send the given message of the given type into the simulator and/or play
    a corresponding sound."""
    global _messageThread
    if _messageThread is not None:
        _messageThread.add(messageType, text, duration, disconnect)

#-------------------------------------------------------------------------------

class AircraftState(object):
    """Base class for the aircraft state produced by the aircraft model based
    on readings from the simulator.

    The following data members should be provided at least:
    - timestamp: the simulator time of the measurement in seconds since the
    epoch (float)
    - latitude (in degrees, North is positive)
    - longitude (in degrees, East is positive)
    - paused: a boolean indicating if the flight simulator is paused for
    whatever reason (it could be a pause mode, or a menu, a dialog, or a
    replay, etc.)
    - trickMode: a boolean indicating if some "trick" mode (e.g. "SLEW" in
    MSFS) is activated
    - overspeed: a boolean indicating if the aircraft is in overspeed
    - stalled: a boolean indicating if the aircraft is stalled
    - onTheGround: a boolean indicating if the aircraft is on the ground    
    - zfw: the zero-fuel weight in kilograms (float)
    - grossWeight: the gross weight in kilograms (float)
    - heading: the heading of the aircraft in degrees (float)
    - pitch: the pitch of the aircraft in degrees. Positive means pitch down,
    negative means pitch up (float)
    - bank: the bank of the aircraft in degrees. Positive means bank left,
    negative means bank right (float)
    - ias: the indicated airspeed in knots (float)    
    - mach: the airspeed in mach (float)    
    - groundSpeed: the ground speed (float)
    - vs: the vertical speed in feet/minutes (float)
    - radioAltitude: the radio altitude of the aircraft in feet (float)
    - altitude: the altitude of the aircraft in feet (float)
    - gLoad: G-load (float)
    - flapsSet: the selected degrees of the flaps (float)
    - flaps: the actual degrees of the flaps (float)
    - fuelWeight[]: the fuel weights in the different tanks in kgs (array of
    floats of as many items as the number fuel tanks)
    - n1[]: the N1 values of the turbine engines (array of floats
    of as many items as the number of engines, present only for aircraft with
    turbines)
    - rpm[]: the RPM values of the piston engines (array of floats
    of as many items as the number of engines, present only for aircraft with
    pistons)
    - reverser[]: an array of booleans indicating if the thrust reversers are
    activated on any of the engines. The number of items equals to the number
    of engines with a reverser.
    - navLightsOn: a boolean indicating if the navigation lights are on
    - antiCollisionLightsOn: a boolean indicating if the anti-collision lights are on
    - strobeLightsOn: a boolean indicating if the strobe lights are on
    - landingLightsOn: a boolean indicating if the landing lights are on
    - pitotHeatOn: a boolean indicating if the pitot heat is on
    - parking: a boolean indicating if the parking brake is set
    - gearsDown: a boolean indicating if the gears are down
    - spoilersArmed: a boolean indicating if the spoilers have been armed for
    automatic deployment
    - spoilersExtension: the percentage of how much the spoiler is extended
    (float) 
    - altimeter: the altimeter setting in hPa (float)
    - nav1: the frequency of the NAV1 radio in MHz (string)
    - nav2: the frequency of the NAV1 radio in MHz (string)
    - squawk: the transponder code (string)
    - windSpeed: the speed of the wind at the aircraft in knots (float)
    - windDirection: the direction of the wind at the aircraft in degrees (float)
    - visibility: the visibility in metres (float)

    FIXME: needed when taxiing only:
    - payload weight

    FIXME: needed rarely:
    - latitude, longitude
    - transporter
    - visibility 
    """