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