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 from ..util import safepath
  12
  13
  14 class Vehicle:
  15     """ Vehicle base class. """
  16
  17     vehicle_type = None
  18     overlay_frame_no = None
  19     approximate_radius = 200
  20     weapons_taped_on = True
  21     selected_seat_overlay_color = (255, 0, 0, 255)
  22     armour = 0
  23
  24     def __init__(self):
  25         self.seats = self.init_seats()
  26         self.game_pos = (0, 0)
  27
  28     def roach_management_overlay(self):
  29         return images.load(safepath("vehicles/walking/background"))
  30
  31     def roach_management_frame(self):
  32         if self.overlay_frame_no is None:
  33             return None
  34         return images.load(safepath("vehicle_big/%s_%d") % (
  35             self.vehicle_type, self.overlay_frame_no))
  36
  37     def init_seats(self):
  38         raise NotImplementedError("Vehicles should specify a list of seats")
  39
  40     def seating(self, world):
  41         roach_seating = world.vehicles[self.vehicle_type].seating
  42         roach_seating_numbers = enumerate(zip(roach_seating, self.seats))
  43         return {
  44             roach: seat_pos
  45             for seat_pos, (roach, _) in roach_seating_numbers if roach
  46         }
  47
  48     def seat_roach(self, world, roach, seat_pos):
  49         vehicle = world.vehicles[self.vehicle_type]
  50         seats = len(self.seats)
  51         seating = list(vehicle.seating)
  52         seating = list(islice(
  53             chain(seating, repeat(None, seats)), 0, seats))
  54         seating[seat_pos] = roach
  55         # line below records new seating on the world proxy
  56         vehicle.seating = seating
  57
  58     def roach_at(self, world, seat_pos):
  59         roach_seating = world.vehicles[self.vehicle_type].seating
  60         if seat_pos >= len(roach_seating):
  61             return None
  62         return roach_seating[seat_pos]
  63
  64     def changed(self):
  65         return False  # TODO: remove this
  66
  67     _vehicle_types = {}
  68
  69     @classmethod
  70     def current(cls, world):
  71         return cls.by_type(world.vehicles.current)
  72
  73     @classmethod
  74     def by_type(cls, vehicle_type):
  75         return cls._vehicle_types.get(vehicle_type)()
  76
  77     @classmethod
  78     def register(cls, vehicle_cls):
  79         cls._vehicle_types[vehicle_cls.__name__.lower()] = vehicle_cls
  80
  81     @classmethod
  82     def random(cls):
  83         return random.choice(list(cls._vehicle_types.keys()))
  84
  85     @classmethod
  86     def register_all(cls):
  87         from .walking import Walking
  88         from .quadcopter import Quadcopter
  89         from .robot import Robot
  90         from .roomba import Roomba
  91         cls.register(Walking)
  92         cls.register(Quadcopter)
  93         cls.register(Robot)
  94         cls.register(Roomba)
  95
  96     def _avatar_frame(self, i, weapon, suffix="_tiles"):
  97         vehicle = images.load(safepath("vehicle%s/%s_%d") % (
  98             suffix, self.vehicle_type, i + 1))
  99         frame = vehicle.copy()
 100         if weapon:
 101             frame.blit(weapon.surf, (0, 0))
 102         return frame
 103
 104     def get_avatar(self, world=None, dead=False):
 105         if not dead:
 106             weapon = default_weapons.assemble(
 107             world.weapons.current, tape=self.weapons_taped_on)
 108             frames = [self._avatar_frame(i, weapon) for i in range(4)]
 109         else:
 110             frames = [self._avatar_frame(0, weapon=None)]
 111         return AnimatedSurfActor(frames, anchor=(0, 0))
 112
 113
 114 class Seat:
 115     """ A space in a vehicle for a roach.
 116
 117     * pos -- (x, y) position of the seat relative to the centre of the vehicle.
 118       x and y may be numbers from approximately -1.0 to 1.0. They will be
 119       multiplied by the approximate_radius of the vehicle.
 120     * roach -- name of the roach occupying the seat, if any.
 121     * allowed -- f(roach) for checking whether a roach may occupy the
 122       seat.
 123     """
 124
 125     def __init__(self, vehicle, pos, roach=None, allowed=None):
 126         self.vehicle = vehicle
 127         self.pos = pos
 128         self.roach = roach
 129         self.allowed = allowed or (lambda roach: True)
 130         vrad = vehicle.approximate_radius
 131         self.vehicle_pos = (pos[0] * vrad, pos[1] * vrad)
 132
 133     def actor(self):
 134         seat = images.load(safepath("vehicles/walking/seat"))
 135         selected_seat = seat.copy()
 136         selected_seat.fill(
 137             self.vehicle.selected_seat_overlay_color, None, BLEND_RGBA_MULT)
 138         return SelectableSurfActor(seat, selected_seat)
 139
 140
 141 def circle_of_seats(n_seats, **kw):
 142     d_theta = 2 * math.pi / n_seats
 143     return [
 144         Seat(pos=(math.sin(i * d_theta), math.cos(i * d_theta)), **kw)
 145         for i in range(n_seats)]
 146
 147
 148 Vehicle.register_all()