koperkapel/vehicles/base.py

   1 """ Base class for vehicles.  """
   2
   3 from pygame.constants import BLEND_RGBA_MULT
   4 from pgzero.actor import Actor
   5 from pgzero.loaders import images
   6 from ..actors.orientatedsurf import OrientatedSurfActor
   7
   8
   9 class Vehicle:
  10     """ Vehicle base class. """
  11
  12     vehicle_type = None
  13     approximate_radius = 200
  14     selected_seat_overlay_color = (255, 0, 0, 255)
  15
  16     def __init__(self):
  17         self.seats = self.init_seats()
  18
  19     def roach_management_overlay(self):
  20         return Actor("vehicles/%s/background" % (self.vehicle_type,))
  21
  22     def init_seats(self):
  23         raise NotImplementedError("Vehicles should specify a list of seats")
  24
  25     def seating(self, world):
  26         roach_seating = world.vehicles[self.vehicle_type].seating
  27         roach_seating_numbers = enumerate(zip(roach_seating, self.seats))
  28         return {
  29             roach: seat_pos
  30             for seat_pos, (roach, _) in roach_seating_numbers if roach
  31         }
  32
  33     _vehicle_types = {}
  34
  35     @classmethod
  36     def current(cls, world):
  37         return cls.by_type(world.vehicles.current)
  38
  39     @classmethod
  40     def by_type(cls, vehicle_type):
  41         return cls._vehicle_types.get(vehicle_type)()
  42
  43     @classmethod
  44     def register(cls, vehicle_cls):
  45         cls._vehicle_types[vehicle_cls.__name__.lower()] = vehicle_cls
  46
  47     @classmethod
  48     def register_all(cls):
  49         from .walking import Walking
  50         cls.register(Walking)
  51
  52
  53 class Seat:
  54     """ A space in a vehicle for a roach.
  55
  56     * pos -- (x, y) position of the seat relative to the centre of the vehicle.
  57       x and y may be numbers from approximately -1.0 to 1.0. They will be
  58       multiplied by the approximate_radius of the vehicle.
  59     * roach -- name of the roach occupying the seat, if any.
  60     * allowed -- f(roach) for checking whether a roach may occupy the
  61       seat.
  62     """
  63
  64     def __init__(self, vehicle, pos, roach=None, allowed=None):
  65         self.vehicle = vehicle
  66         self.pos = pos
  67         self.roach = roach
  68         self.allowed = allowed or (lambda roach: True)
  69         vrad = vehicle.approximate_radius
  70         self.vehicle_pos = (pos[0] * vrad, pos[1] * vrad)
  71
  72     def actor(self):
  73         seat = images.load(
  74             "vehicles/%s/seat" % (self.vehicle.vehicle_type,))
  75         selected_seat = seat.copy()
  76         selected_seat.fill(
  77             self.vehicle.selected_seat_overlay_color, None, BLEND_RGBA_MULT)
  78         return SeatActor(seat, selected_seat)
  79
  80
  81 class SeatActor(OrientatedSurfActor):
  82     def __init__(self, seat, selected_seat):
  83         self._selected = False
  84         self._seat = seat
  85         self._selected_seat = selected_seat
  86         super().__init__(surf=self._seat, angle=0)
  87
  88     @property
  89     def selected(self):
  90         return self._selected
  91
  92     @selected.setter
  93     def selected(self, value):
  94         self._selected = value
  95         self.surf = self._selected_seat if value else self._seat
  96
  97
  98 Vehicle.register_all()