koperkapel/vehicles/base.py

   1 """ Base class for vehicles.  """
   2
   3 import math
   4 from itertools import chain, islice, repeat
   5 from pygame.constants import BLEND_RGBA_MULT
   6 from pgzero.loaders import images
   7 from ..actors.orientatedsurf import OrientatedSurfActor
   8 from ..actors.animsurf import AnimatedSurfActor
   9
  10
  11 class Vehicle:
  12     """ Vehicle base class. """
  13
  14     vehicle_type = None
  15     overlay_frame_no = None
  16     approximate_radius = 200
  17     selected_seat_overlay_color = (255, 0, 0, 255)
  18
  19     def __init__(self):
  20         self.seats = self.init_seats()
  21         self.game_pos = (0, 0)
  22
  23     def roach_management_overlay(self):
  24         return images.load("vehicles/walking/background")
  25
  26     def roach_management_frame(self):
  27         if self.overlay_frame_no is None:
  28             return None
  29         return images.load("vehicle_big/%s_%d" % (
  30             self.vehicle_type, self.overlay_frame_no))
  31
  32     def init_seats(self):
  33         raise NotImplementedError("Vehicles should specify a list of seats")
  34
  35     def seating(self, world):
  36         roach_seating = world.vehicles[self.vehicle_type].seating
  37         roach_seating_numbers = enumerate(zip(roach_seating, self.seats))
  38         return {
  39             roach: seat_pos
  40             for seat_pos, (roach, _) in roach_seating_numbers if roach
  41         }
  42
  43     def seat_roach(self, world, roach, seat_pos):
  44         vehicle = world.vehicles[self.vehicle_type]
  45         seats = len(self.seats)
  46         seating = list(vehicle.seating)
  47         seating = list(islice(
  48             chain(seating, repeat(None, seats)), 0, seats))
  49         seating[seat_pos] = roach
  50         # line below records new seating on the world proxy
  51         vehicle.seating = seating
  52
  53     def roach_at(self, world, seat_pos):
  54         roach_seating = world.vehicles[self.vehicle_type].seating
  55         if seat_pos >= len(roach_seating):
  56             return None
  57         return roach_seating[seat_pos]
  58
  59     def changed(self):
  60         return False  # TODO: remove this
  61
  62     _vehicle_types = {}
  63
  64     @classmethod
  65     def current(cls, world):
  66         return cls.by_type(world.vehicles.current)
  67
  68     @classmethod
  69     def by_type(cls, vehicle_type):
  70         return cls._vehicle_types.get(vehicle_type)()
  71
  72     @classmethod
  73     def register(cls, vehicle_cls):
  74         cls._vehicle_types[vehicle_cls.__name__.lower()] = vehicle_cls
  75
  76     @classmethod
  77     def register_all(cls):
  78         from .walking import Walking
  79         from .quadcopter import Quadcopter
  80         from .robot import Robot
  81         from .roomba import Roomba
  82         cls.register(Walking)
  83         cls.register(Quadcopter)
  84         cls.register(Robot)
  85         cls.register(Roomba)
  86
  87     def _avatar_frame(self, i, suffix="_tiles"):
  88         vehicle = images.load("vehicle%s/%s_%d" % (
  89             suffix, self.vehicle_type, i + 1))
  90         frame = vehicle.copy()
  91         return frame
  92
  93     def get_avatar(self, world):
  94         frames = [self._avatar_frame(i) for i in range(4)]
  95         return AnimatedSurfActor(frames, anchor=(0, 0))
  96
  97
  98 class Seat:
  99     """ A space in a vehicle for a roach.
 100
 101     * pos -- (x, y) position of the seat relative to the centre of the vehicle.
 102       x and y may be numbers from approximately -1.0 to 1.0. They will be
 103       multiplied by the approximate_radius of the vehicle.
 104     * roach -- name of the roach occupying the seat, if any.
 105     * allowed -- f(roach) for checking whether a roach may occupy the
 106       seat.
 107     """
 108
 109     def __init__(self, vehicle, pos, roach=None, allowed=None):
 110         self.vehicle = vehicle
 111         self.pos = pos
 112         self.roach = roach
 113         self.allowed = allowed or (lambda roach: True)
 114         vrad = vehicle.approximate_radius
 115         self.vehicle_pos = (pos[0] * vrad, pos[1] * vrad)
 116
 117     def actor(self):
 118         seat = images.load("vehicles/walking/seat")
 119         selected_seat = seat.copy()
 120         selected_seat.fill(
 121             self.vehicle.selected_seat_overlay_color, None, BLEND_RGBA_MULT)
 122         return SeatActor(seat, selected_seat)
 123
 124
 125 class SeatActor(OrientatedSurfActor):
 126     def __init__(self, seat, selected_seat):
 127         self._selected = False
 128         self._seat = seat
 129         self._selected_seat = selected_seat
 130         super().__init__(surf=self._seat, angle=0)
 131
 132     @property
 133     def selected(self):
 134         return self._selected
 135
 136     @selected.setter
 137     def selected(self, value):
 138         self._selected = value
 139         self.surf = self._selected_seat if value else self._seat
 140
 141
 142 def circle_of_seats(n_seats, **kw):
 143     d_theta = 2 * math.pi / n_seats
 144     return [
 145         Seat(pos=(math.sin(i * d_theta), math.cos(i * d_theta)), **kw)
 146         for i in range(n_seats)]
 147
 148
 149 Vehicle.register_all()