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