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         self._held_keys = set()
  88         if self._level is not None:
  89             for generator in self._generators:
  90                 generator.unpause()
  91             return
  92         super().enter(world)
  93         self._roaches = self.actors.add_layer("roaches", level=10)
  94         self._friends = self.actors.add_layer("friendly roaches", level=9)
  95         self._items = self.actors.add_layer("items", level=9)
  96         self._generators = self.actors.add_layer("enemy generators", level=8)
  97         self._enemies = self.actors.add_layer("enemies", level=7)
  98         self._vehicle = Vehicle.current(world)
  99         self._mode = 'walk'
 100         self._angle = 0
 101         self._init_items()
 102         self._init_friendly_roaches()
 103         self._init_generators()
 104         self._key_rate = 0.2
 105         self._last_key_down = 0
 106         return self._init_roaches(world)
 107
 108     def _init_items(self):
 109         for item in self._level.items:
 110             self._items.add(item)
 111
 112     def _init_friendly_roaches(self):
 113         for friend in self._level.friends:
 114             self._friends.add(friend)
 115
 116     def exit(self, world):
 117         for generator in self._generators:
 118             # We don't want these running while we're on other levels, but we don't want to delete them
 119             # here either (because of the vehicle management view)
 120             generator.pause()
 121
 122     def _init_generators(self):
 123         for generator in self._level.enemy_generators:
 124             self._generators.add(generator)
 125             generator.unpause()
 126
 127     def _init_roaches(self, world):
 128         x, y = self._level.start_pos
 129         self._level_layer = 'floor'
 130         self._avatar = self._vehicle.get_avatar(world)
 131         self._set_pos(x, y)
 132         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 133         self._roaches.add(self._avatar)
 134         # Fix viewport offset
 135         return [
 136             MoveViewportEvent((
 137                 x * TILE_SIZE - WIDTH // 2,
 138                 y * TILE_SIZE - HEIGHT // 2))]
 139
 140     def _set_pos(self, x, y):
 141         self._player_pos = (x, y)
 142         # print('At ', (x, y))
 143
 144     def _can_move(self, x, y):
 145         if self._mode == 'walk':
 146             return self._level.can_walk(x, y, self._level_layer)
 147         elif self._mode == 'fly':
 148             return self._level.can_fly(x, y, self._level_layer)
 149         elif self._mode == 'crawl':
 150             return self._level.can_crawl(x, y, self._level_layer)
 151
 152     def _set_angle(self, angle):
 153         self._angle = angle
 154         self._avatar.angle = angle
 155
 156     @defer_to_update
 157     def _vehicle_changed(self, world):
 158         self._roaches.remove(self._avatar)
 159         self._vehicle = Vehicle.current(world)
 160         self._avatar = self._vehicle.get_avatar(world)
 161         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 162         self._roaches.add(self._avatar)
 163         self._set_angle(self._angle)
 164
 165     @defer_to_update
 166     def _add_roach(self, world):
 167         world.roaches.append(build_roach(world))
 168         self._vehicle_changed()
 169
 170     @defer_to_update
 171     def _change_vehicle(self, world):
 172         vehicle = Vehicle.random()
 173         world.vehicles.current = vehicle
 174         self._vehicle_changed()
 175
 176     def update(self, world, engine, dt):
 177         super().update(world, engine, dt)
 178         events = world.pop_events()
 179         for friend in self._friends:
 180             friend.pos = self.calc_offset(
 181                 friend.game_pos[0] * TILE_SIZE, friend.game_pos[1] * TILE_SIZE)
 182         for item in self._items:
 183             item.pos = self.calc_offset(
 184                 item.game_pos[0] * TILE_SIZE, item.game_pos[1] * TILE_SIZE)
 185         more = self._check_held_keys(dt)
 186         if more:
 187             events.extend(more)
 188         return events
 189
 190     def _check_held_keys(self, dt):
 191         for key in self._held_keys:
 192             self._last_key_down += dt
 193             if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 194                 return self._movement_key(key, dt)
 195             elif key == keys.X:
 196                 return self._fire_key(dt)
 197
 198     def _movement_key(self, key, dt):
 199         x, y = self._player_pos
 200         for k, dp, angle in (
 201             (keys.DOWN, (0, 1), 180),
 202             (keys.UP, (0, -1), 0),
 203             (keys.LEFT, (-1, 0), 90),
 204             (keys.RIGHT, (1, 0), -90),
 205         ):
 206             if key == k:
 207                 if self._angle == angle and self._last_key_down > self._key_rate:
 208                     nx, ny = x + dp[0], y + dp[1]
 209                     if self._can_move(nx, ny):
 210                         self._set_pos(nx, ny)
 211                         offset = (TILE_SIZE * dp[0], TILE_SIZE * dp[1])
 212                         self._set_angle(angle)
 213                         self._last_key_down = 0
 214                         return [MoveViewportEvent(offset)]
 215                 else:
 216                     # just turn
 217                     self._set_angle(angle)
 218
 219     def _activate_key(self):
 220         x, y = self._player_pos
 221         if self._level.is_grate(x, y):
 222             if (self._level_layer == 'floor' and
 223                     self._level.can_crawl(x, y, 'floor')):
 224                 if self._level.can_crawl(x, y, 'tunnels'):
 225                     self._level_layer = 'tunnels'
 226                     self._mode = 'crawl'
 227             elif self._level.can_crawl(x, y, 'floor'):
 228                 # Must be in the tunnels already
 229                 self._level_layer = 'floor'
 230                 self._mode = 'walk'
 231         elif self._level.is_keypad(x, y):
 232             self._level.press_keypad(x, y, self._roaches)
 233         elif self._level.friend_at(x, y):
 234             friend = self._level.friend_at(x, y)
 235             self._level.remove_friend(friend)
 236             self._friends.remove(friend)
 237             self._add_roach()
 238         elif self._level.item_at(x, y):
 239             item = self._level.item_at(x, y)
 240             self._level.remove_item(item)
 241             self._items.remove(item)
 242         elif self._level.is_exit(x, y):
 243             next_level = self._level.get_exit_level()
 244             return [
 245                 WorldEvent('set', {'level.name': next_level}),
 246                 ChangeSceneEvent(GameLevelScene())]
 247
 248     def _fire_key(self, dt):
 249         if self._last_key_down > self._key_rate:
 250             self._last_key_down = 0
 251             print('Boom')
 252
 253     def _vehicle_management_key(self):
 254         from .roach_management import RoachesScene
 255         return [ChangeSceneEvent(RoachesScene(level_scene=self))]
 256
 257     def on_key_down(self, key, mod, unicode):
 258         x, y = self._player_pos
 259         if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 260             self._held_keys.clear()
 261             self._held_keys.add(key)
 262             # We do this so pressing the key has an instant effect, and can then be held
 263             self._last_key_down = self._key_rate + 0.01
 264             return self._movement_key(key, 0.01)
 265         elif key == keys.C:
 266             return self._activate_key()
 267         elif key == keys.X:
 268             self._held_keys.clear()
 269             self._held_keys.add(key)
 270             self._last_key_down = self._key_rate + 0.01
 271             return self._fire_key(0.01)
 272         elif key == keys.V:
 273             return self._change_vehicle()
 274         elif key == keys.Z:
 275             return self._vehicle_management_key()
 276         return super(GameLevelScene, self).on_key_down(key, mod, unicode)
 277
 278     def on_key_up(self, key, mode):
 279         self._held_keys.discard(key)
 280         self._last_key_down = 0