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