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