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