koperkapel/vehicles/base.py

   1 """ Base class for vehicles.  """
   2
   3 from itertools import chain, islice, repeat
   4 from pygame.constants import BLEND_RGBA_MULT
   5 from pgzero.actor import Actor
   6 from pgzero.loaders import images
   7 from ..actors.orientatedsurf import OrientatedSurfActor
   8
   9
  10 class Vehicle:
  11     """ Vehicle base class. """
  12
  13     vehicle_type = None
  14     approximate_radius = 200
  15     selected_seat_overlay_color = (255, 0, 0, 255)
  16
  17     def __init__(self):
  18         self.seats = self.init_seats()
  19         self.game_pos = (0, 0)
  20
  21     def roach_management_overlay(self):
  22         return Actor("vehicles/%s/background" % (self.vehicle_type,))
  23
  24     def init_seats(self):
  25         raise NotImplementedError("Vehicles should specify a list of seats")
  26
  27     def seating(self, world):
  28         roach_seating = world.vehicles[self.vehicle_type].seating
  29         roach_seating_numbers = enumerate(zip(roach_seating, self.seats))
  30         return {
  31             roach: seat_pos
  32             for seat_pos, (roach, _) in roach_seating_numbers if roach
  33         }
  34
  35     def seat_roach(self, world, roach, seat_pos):
  36         vehicle = world.vehicles[self.vehicle_type]
  37         seats = len(self.seats)
  38         seating = list(vehicle.seating)
  39         seating = list(islice(
  40             chain(seating, repeat(None, seats)), 0, seats))
  41         seating[seat_pos] = roach
  42         # line below records new seating on the world proxy
  43         vehicle.seating = seating
  44
  45     def roach_at(self, world, seat_pos):
  46         roach_seating = world.vehicles[self.vehicle_type].seating
  47         if seat_pos >= len(roach_seating):
  48             return None
  49         return roach_seating[seat_pos]
  50
  51     _vehicle_types = {}
  52
  53     @classmethod
  54     def current(cls, world):
  55         return cls.by_type(world.vehicles.current)
  56
  57     @classmethod
  58     def by_type(cls, vehicle_type):
  59         return cls._vehicle_types.get(vehicle_type)()
  60
  61     @classmethod
  62     def register(cls, vehicle_cls):
  63         cls._vehicle_types[vehicle_cls.__name__.lower()] = vehicle_cls
  64
  65     @classmethod
  66     def register_all(cls):
  67         from .walking import Walking
  68         cls.register(Walking)
  69
  70     def get_avatar(self, world):
  71         raise NotImplementedError("Vehicles should know how to create their own avatars.")
  72
  73
  74 class Seat:
  75     """ A space in a vehicle for a roach.
  76
  77     * pos -- (x, y) position of the seat relative to the centre of the vehicle.
  78       x and y may be numbers from approximately -1.0 to 1.0. They will be
  79       multiplied by the approximate_radius of the vehicle.
  80     * roach -- name of the roach occupying the seat, if any.
  81     * allowed -- f(roach) for checking whether a roach may occupy the
  82       seat.
  83     """
  84
  85     def __init__(self, vehicle, pos, roach=None, allowed=None):
  86         self.vehicle = vehicle
  87         self.pos = pos
  88         self.roach = roach
  89         self.allowed = allowed or (lambda roach: True)
  90         vrad = vehicle.approximate_radius
  91         self.vehicle_pos = (pos[0] * vrad, pos[1] * vrad)
  92
  93     def actor(self):
  94         seat = images.load(
  95             "vehicles/%s/seat" % (self.vehicle.vehicle_type,))
  96         selected_seat = seat.copy()
  97         selected_seat.fill(
  98             self.vehicle.selected_seat_overlay_color, None, BLEND_RGBA_MULT)
  99         return SeatActor(seat, selected_seat)
 100
 101
 102 class SeatActor(OrientatedSurfActor):
 103     def __init__(self, seat, selected_seat):
 104         self._selected = False
 105         self._seat = seat
 106         self._selected_seat = selected_seat
 107         super().__init__(surf=self._seat, angle=0)
 108
 109     @property
 110     def selected(self):
 111         return self._selected
 112
 113     @selected.setter
 114     def selected(self, value):
 115         self._selected = value
 116         self.surf = self._selected_seat if value else self._seat
 117
 118
 119 Vehicle.register_all()