koperkapel/scenes/level.py

   1 """Render a level"""
   2
   3 from pgzero.constants import keys
   4 from pygame import Surface
   5 import pygame.locals as pgl
   6 from ..loaders.levelloader import levels
   7 from .base import Scene, ChangeSceneEvent, MoveViewportEvent, WorldEvent, defer_to_update
   8 from ..constants import TILE_SIZE, WIDTH, HEIGHT
   9 from ..roaches import build_roach
  10 from ..vehicles.base import Vehicle
  11
  12
  13 class BaseLevelScene(Scene):
  14     """ Level scene. """
  15
  16     def __init__(self):
  17         super().__init__()
  18         self._level = None
  19
  20     def enter(self, world):
  21         self._level = levels.load(world.level.name)
  22         self._tiles = self._level.tiles
  23         self._level_layer = 'floor'
  24         self._surfaces = {}
  25         self._overlay = {}
  26         for layer in ['floor', 'tunnels']:
  27             self._surfaces[layer] = self._render(layer)
  28         self._overlay = self._surfaces['floor'].copy()
  29         self._doors = self.actors.add_layer("doors", level=9)
  30         self._keypads = self.actors.add_layer("keypads", level=8)
  31         # These are already Actors
  32         for door in self._level.doors:
  33             self._doors.add(door)
  34         for keypad in self._level.keypads:
  35             self._keypads.add(keypad)
  36
  37     def _render(self, layer):
  38         # We cache the rendered surface to avoid doing a large number
  39         # of blits each frame, as that introduces a large performance
  40         # overhead.
  41         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  42                            len(self._tiles) * TILE_SIZE))
  43         layer_key = '%s image' % layer
  44         for y, row in enumerate(self._tiles):
  45             for x, tile in enumerate(row):
  46                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  47                 if layer_key not in tile:
  48                     # Skip broken tiles for now
  49                     continue
  50                 surface.blit(tile[layer_key], pos)
  51         return surface.convert_alpha()
  52
  53     def update(self, world, engine, dt):
  54         """Fix the door and keypad positions"""
  55         super().update(world, engine, dt)
  56         for door in self._doors:
  57             door.pos = self.calc_offset(
  58                 door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  59         for keypad in self._keypads:
  60             keypad.pos = self.calc_offset(
  61                 keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  62
  63     def draw(self, screen):
  64         screen.clear()
  65         # Viewport is the position of the screen relative to the
  66         # surface. We need the position of the surface relative to
  67         # the screen for the blit, so this conversion
  68         viewport = self.viewport
  69         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  70                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  71         if self._level_layer != 'floor':
  72             screen.surface.blit(
  73                 self._overlay, (0, 0),
  74                 area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  75                 special_flags=pgl.BLEND_MULT)
  76         self.actors.draw(screen)
  77
  78     def on_key_down(self, key, mod, unicode):
  79         if key == keys.ESCAPE:
  80             from .menu import MenuScene
  81             return [ChangeSceneEvent(MenuScene())]
  82
  83
  84 class GameLevelScene(BaseLevelScene):
  85
  86     def enter(self, world):
  87         print('enter', world['level']['name'], self._level)
  88         if self._level is not None:
  89             return
  90         super().enter(world)
  91         self._roaches = self.actors.add_layer("roaches", level=10)
  92         self._friends = self.actors.add_layer("friendly roaches", level=9)
  93         self._vehicle = Vehicle.current(world)
  94         self._mode = 'walk'
  95         self._angle = 0
  96         return self._init_roaches(world)
  97
  98     def _init_roaches(self, world):
  99         x, y = self._level.start_pos
 100         self._level_layer = 'floor'
 101         self._avatar = self._vehicle.get_avatar(world)
 102         self._set_pos(x, y)
 103         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 104         self._roaches.add(self._avatar)
 105         for friend in self._level.friends:
 106             self._friends.add(friend)
 107         # Fix viewport offset
 108         return [
 109             MoveViewportEvent((
 110                 x * TILE_SIZE - WIDTH // 2,
 111                 y * TILE_SIZE - HEIGHT // 2))]
 112
 113     def _set_pos(self, x, y):
 114         self._player_pos = (x, y)
 115         # print('At ', (x, y))
 116
 117     def _can_move(self, x, y):
 118         if self._mode == 'walk':
 119             return self._level.can_walk(x, y, self._level_layer)
 120         elif self._mode == 'fly':
 121             return self._level.can_fly(x, y, self._level_layer)
 122         elif self._mode == 'crawl':
 123             return self._level.can_crawl(x, y, self._level_layer)
 124
 125     def _set_angle(self, angle):
 126         self._angle = angle
 127         self._avatar.angle = angle
 128
 129     @defer_to_update
 130     def _vehicle_changed(self, world):
 131         self._roaches.remove(self._avatar)
 132         self._vehicle = Vehicle.current(world)
 133         self._avatar = self._vehicle.get_avatar(world)
 134         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 135         self._roaches.add(self._avatar)
 136         self._set_angle(self._angle)
 137
 138     @defer_to_update
 139     def _add_roach(self, world):
 140         world.roaches.append(build_roach(world))
 141         self._vehicle_changed()
 142
 143     @defer_to_update
 144     def _change_vehicle(self, world):
 145         vehicle = Vehicle.random()
 146         world.vehicles.current = vehicle
 147         self._vehicle_changed()
 148
 149     def update(self, world, engine, dt):
 150         super().update(world, engine, dt)
 151         events = world.pop_events()
 152         for friend in self._friends:
 153             friend.pos = self.calc_offset(
 154                 friend.game_pos[0] * TILE_SIZE, friend.game_pos[1] * TILE_SIZE)
 155         return events
 156
 157     def _movement_key(self, key):
 158         x, y = self._player_pos
 159         for k, dp, angle in (
 160             (keys.DOWN, (0, 1), 180),
 161             (keys.UP, (0, -1), 0),
 162             (keys.LEFT, (-1, 0), 90),
 163             (keys.RIGHT, (1, 0), -90),
 164         ):
 165             if key == k:
 166                 nx, ny = x + dp[0], y + dp[1]
 167                 if self._can_move(nx, ny):
 168                     self._set_pos(nx, ny)
 169                     offset = (TILE_SIZE * dp[0], TILE_SIZE * dp[1])
 170                     self._set_angle(angle)
 171                     return [MoveViewportEvent(offset)]
 172
 173     def _activate_key(self):
 174         x, y = self._player_pos
 175         if self._level.is_grate(x, y):
 176             if (self._level_layer == 'floor' and
 177                     self._level.can_crawl(x, y, 'floor')):
 178                 if self._level.can_crawl(x, y, 'tunnels'):
 179                     self._level_layer = 'tunnels'
 180                     self._mode = 'crawl'
 181             elif self._level.can_crawl(x, y, 'floor'):
 182                 # Must be in the tunnels already
 183                 self._level_layer = 'floor'
 184                 self._mode = 'walk'
 185         elif self._level.is_keypad(x, y):
 186             self._level.press_keypad(x, y, self._roaches)
 187         elif self._level.is_on_friend(x, y):
 188             friend = self._level.remove_friend(x, y)
 189             self._friends.remove(friend)
 190             self._add_roach()
 191         elif self._level.is_exit(x, y):
 192             next_level = self._level.get_exit_level()
 193             return [WorldEvent('set', {'level.name': next_level}), ChangeSceneEvent(GameLevelScene())]
 194
 195     def _fire_key(self):
 196         print('Boom')
 197
 198     def _vehicle_management_key(self):
 199         from .roach_management import RoachesScene
 200         return [ChangeSceneEvent(RoachesScene(level_scene=self))]
 201
 202     def on_key_down(self, key, mod, unicode):
 203         x, y = self._player_pos
 204         if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 205             return self._movement_key(key)
 206         elif key == keys.C:
 207             return self._activate_key()
 208         elif key == keys.X:
 209             return self._fire_key()
 210         elif key == keys.V:
 211             return self._change_vehicle()
 212         elif key == keys.Z:
 213             return self._vehicle_management_key()
 214         return super(GameLevelScene, self).on_key_down(key, mod, unicode)