koperkapel/vehicles/base.py

   1 """ Base class for vehicles.  """
   2
   3 import math
   4 import random
   5 from itertools import chain, islice, repeat
   6 from pygame.constants import BLEND_RGBA_MULT
   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     overlay_frame_no = None
  17     approximate_radius = 200
  18     selected_seat_overlay_color = (255, 0, 0, 255)
  19
  20     def __init__(self):
  21         self.seats = self.init_seats()
  22         self.game_pos = (0, 0)
  23
  24     def roach_management_overlay(self):
  25         return images.load("vehicles/walking/background")
  26
  27     def roach_management_frame(self):
  28         if self.overlay_frame_no is None:
  29             return None
  30         return images.load("vehicle_big/%s_%d" % (
  31             self.vehicle_type, self.overlay_frame_no))
  32
  33     def init_seats(self):
  34         raise NotImplementedError("Vehicles should specify a list of seats")
  35
  36     def seating(self, world):
  37         roach_seating = world.vehicles[self.vehicle_type].seating
  38         roach_seating_numbers = enumerate(zip(roach_seating, self.seats))
  39         return {
  40             roach: seat_pos
  41             for seat_pos, (roach, _) in roach_seating_numbers if roach
  42         }
  43
  44     def seat_roach(self, world, roach, seat_pos):
  45         vehicle = world.vehicles[self.vehicle_type]
  46         seats = len(self.seats)
  47         seating = list(vehicle.seating)
  48         seating = list(islice(
  49             chain(seating, repeat(None, seats)), 0, seats))
  50         seating[seat_pos] = roach
  51         # line below records new seating on the world proxy
  52         vehicle.seating = seating
  53
  54     def roach_at(self, world, seat_pos):
  55         roach_seating = world.vehicles[self.vehicle_type].seating
  56         if seat_pos >= len(roach_seating):
  57             return None
  58         return roach_seating[seat_pos]
  59
  60     def changed(self):
  61         return False  # TODO: remove this
  62
  63     _vehicle_types = {}
  64
  65     @classmethod
  66     def current(cls, world):
  67         return cls.by_type(world.vehicles.current)
  68
  69     @classmethod
  70     def by_type(cls, vehicle_type):
  71         return cls._vehicle_types.get(vehicle_type)()
  72
  73     @classmethod
  74     def register(cls, vehicle_cls):
  75         cls._vehicle_types[vehicle_cls.__name__.lower()] = vehicle_cls
  76
  77     @classmethod
  78     def random(cls):
  79         return random.choice(list(cls._vehicle_types.keys()))
  80
  81     @classmethod
  82     def register_all(cls):
  83         from .walking import Walking
  84         from .quadcopter import Quadcopter
  85         from .robot import Robot
  86         from .roomba import Roomba
  87         cls.register(Walking)
  88         cls.register(Quadcopter)
  89         cls.register(Robot)
  90         cls.register(Roomba)
  91
  92     def _avatar_frame(self, i, suffix="_tiles"):
  93         vehicle = images.load("vehicle%s/%s_%d" % (
  94             suffix, self.vehicle_type, i + 1))
  95         frame = vehicle.copy()
  96         return frame
  97
  98     def get_avatar(self, world):
  99         frames = [self._avatar_frame(i) for i in range(4)]
 100         return AnimatedSurfActor(frames, anchor=(0, 0))
 101
 102
 103 class Seat:
 104     """ A space in a vehicle for a roach.
 105
 106     * pos -- (x, y) position of the seat relative to the centre of the vehicle.
 107       x and y may be numbers from approximately -1.0 to 1.0. They will be
 108       multiplied by the approximate_radius of the vehicle.
 109     * roach -- name of the roach occupying the seat, if any.
 110     * allowed -- f(roach) for checking whether a roach may occupy the
 111       seat.
 112     """
 113
 114     def __init__(self, vehicle, pos, roach=None, allowed=None):
 115         self.vehicle = vehicle
 116         self.pos = pos
 117         self.roach = roach
 118         self.allowed = allowed or (lambda roach: True)
 119         vrad = vehicle.approximate_radius
 120         self.vehicle_pos = (pos[0] * vrad, pos[1] * vrad)
 121
 122     def actor(self):
 123         seat = images.load("vehicles/walking/seat")
 124         selected_seat = seat.copy()
 125         selected_seat.fill(
 126             self.vehicle.selected_seat_overlay_color, None, BLEND_RGBA_MULT)
 127         return SeatActor(seat, selected_seat)
 128
 129
 130 class SeatActor(OrientatedSurfActor):
 131     def __init__(self, seat, selected_seat):
 132         self._selected = False
 133         self._seat = seat
 134         self._selected_seat = selected_seat
 135         super().__init__(surf=self._seat, angle=0)
 136
 137     @property
 138     def selected(self):
 139         return self._selected
 140
 141     @selected.setter
 142     def selected(self, value):
 143         self._selected = value
 144         self.surf = self._selected_seat if value else self._seat
 145
 146
 147 def circle_of_seats(n_seats, **kw):
 148     d_theta = 2 * math.pi / n_seats
 149     return [
 150         Seat(pos=(math.sin(i * d_theta), math.cos(i * d_theta)), **kw)
 151         for i in range(n_seats)]
 152
 153
 154 Vehicle.register_all()