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 (
   8     Scene, ChangeSceneEvent, MoveViewportEvent, WorldEvent, defer_to_update)
   9 from ..constants import TILE_SIZE, WIDTH, HEIGHT
  10 from ..roaches import build_roach
  11 from ..vehicles.base import Vehicle
  12
  13
  14 class BaseLevelScene(Scene):
  15     """ Level scene. """
  16
  17     def __init__(self):
  18         super().__init__()
  19         self._level = None
  20
  21     def enter(self, world):
  22         self._level = levels.load(world.level.name)
  23         self._tiles = self._level.tiles
  24         self._level_layer = 'floor'
  25         self._surfaces = {}
  26         self._overlay = {}
  27         for layer in ['floor', 'tunnels']:
  28             self._surfaces[layer] = self._render(layer)
  29         self._overlay = self._surfaces['floor'].copy()
  30         self._doors = self.actors.add_layer("doors", level=9)
  31         self._keypads = self.actors.add_layer("keypads", level=8)
  32         # These are already Actors
  33         for door in self._level.doors:
  34             self._doors.add(door)
  35         for keypad in self._level.keypads:
  36             self._keypads.add(keypad)
  37
  38     def _render(self, layer):
  39         # We cache the rendered surface to avoid doing a large number
  40         # of blits each frame, as that introduces a large performance
  41         # overhead.
  42         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  43                            len(self._tiles) * TILE_SIZE))
  44         layer_key = '%s image' % layer
  45         for y, row in enumerate(self._tiles):
  46             for x, tile in enumerate(row):
  47                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  48                 if layer_key not in tile:
  49                     # Skip broken tiles for now
  50                     continue
  51                 surface.blit(tile[layer_key], pos)
  52         return surface.convert_alpha()
  53
  54     def update(self, world, engine, dt):
  55         """Fix the door and keypad positions"""
  56         super().update(world, engine, dt)
  57         for door in self._doors:
  58             door.pos = self.calc_offset(
  59                 door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  60         for keypad in self._keypads:
  61             keypad.pos = self.calc_offset(
  62                 keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  63
  64     def draw(self, screen):
  65         screen.clear()
  66         # Viewport is the position of the screen relative to the
  67         # surface. We need the position of the surface relative to
  68         # the screen for the blit, so this conversion
  69         viewport = self.viewport
  70         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  71                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  72         if self._level_layer != 'floor':
  73             screen.surface.blit(
  74                 self._overlay, (0, 0),
  75                 area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  76                 special_flags=pgl.BLEND_MULT)
  77         self.actors.draw(screen)
  78
  79     def on_key_down(self, key, mod, unicode):
  80         if key == keys.ESCAPE:
  81             from .menu import MenuScene
  82             return [ChangeSceneEvent(MenuScene())]
  83
  84
  85 class GameLevelScene(BaseLevelScene):
  86
  87     def enter(self, world):
  88         self._held_keys = set()
  89         if self._level is not None:
  90             for generator in self._generators:
  91                 generator.unpause()
  92             return
  93         super().enter(world)
  94         self._roaches = self.actors.add_layer("roaches", level=10)
  95         self._friends = self.actors.add_layer("friendly roaches", level=9)
  96         self._items = self.actors.add_layer("items", level=9)
  97         self._generators = self.actors.add_layer("enemy generators", level=8)
  98         self._enemies = self.actors.add_layer("enemies", level=7)
  99         self._vehicle = Vehicle.current(world)
 100         self._mode = 'walk'
 101         self._angle = 0
 102         self._init_items()
 103         self._init_friendly_roaches()
 104         self._init_generators()
 105         self._key_rate = 0.2
 106         self._last_key_down = 0
 107         return self._init_roaches(world)
 108
 109     def _init_items(self):
 110         for item in self._level.items:
 111             self._items.add(item)
 112
 113     def _init_friendly_roaches(self):
 114         for friend in self._level.friends:
 115             self._friends.add(friend)
 116
 117     def exit(self, world):
 118         for generator in self._generators:
 119             # We don't want these running while we're on other levels, but we
 120             # don't want to delete them here either (because of the vehicle
 121             # management view)
 122             generator.pause()
 123
 124     def _init_generators(self):
 125         for generator in self._level.enemy_generators:
 126             self._generators.add(generator)
 127             generator.unpause()
 128
 129     def _init_roaches(self, world):
 130         x, y = self._level.start_pos
 131         self._level_layer = 'floor'
 132         self._avatar = self._vehicle.get_avatar(world)
 133         self._set_pos(x, y)
 134         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 135         self._roaches.add(self._avatar)
 136         # Fix viewport offset
 137         return [
 138             MoveViewportEvent((
 139                 x * TILE_SIZE - WIDTH // 2,
 140                 y * TILE_SIZE - HEIGHT // 2))]
 141
 142     def _set_pos(self, x, y):
 143         self._player_pos = (x, y)
 144         # print('At ', (x, y))
 145
 146     def _can_move(self, x, y):
 147         if self._mode == 'walk':
 148             return self._level.can_walk(x, y, self._level_layer)
 149         elif self._mode == 'fly':
 150             return self._level.can_fly(x, y, self._level_layer)
 151         elif self._mode == 'crawl':
 152             return self._level.can_crawl(x, y, self._level_layer)
 153
 154     def _set_angle(self, angle):
 155         self._angle = angle
 156         self._avatar.angle = angle
 157
 158     @defer_to_update
 159     def _vehicle_changed(self, world):
 160         self._roaches.remove(self._avatar)
 161         self._vehicle = Vehicle.current(world)
 162         self._avatar = self._vehicle.get_avatar(world)
 163         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 164         self._roaches.add(self._avatar)
 165         self._set_angle(self._angle)
 166
 167     @defer_to_update
 168     def _add_roach(self, world):
 169         world.roaches.append(build_roach(world))
 170         self._vehicle_changed()
 171
 172     @defer_to_update
 173     def _change_vehicle(self, world):
 174         vehicle = Vehicle.random()
 175         world.vehicles.current = vehicle
 176         self._vehicle_changed()
 177
 178     def update(self, world, engine, dt):
 179         super().update(world, engine, dt)
 180         events = world.pop_events()
 181         for friend in self._friends:
 182             friend.pos = self.calc_offset(
 183                 friend.game_pos[0] * TILE_SIZE, friend.game_pos[1] * TILE_SIZE)
 184         for item in self._items:
 185             item.pos = self.calc_offset(
 186                 item.game_pos[0] * TILE_SIZE, item.game_pos[1] * TILE_SIZE)
 187         more = self._check_held_keys(dt)
 188         if more:
 189             events.extend(more)
 190         return events
 191
 192     def _check_held_keys(self, dt):
 193         for key in self._held_keys:
 194             self._last_key_down += dt
 195             if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 196                 return self._movement_key(key, dt)
 197             elif key == keys.X:
 198                 return self._fire_key(dt)
 199
 200     def _movement_key(self, key, dt):
 201         x, y = self._player_pos
 202         for k, dp, angle in (
 203             (keys.DOWN, (0, 1), 180),
 204             (keys.UP, (0, -1), 0),
 205             (keys.LEFT, (-1, 0), 90),
 206             (keys.RIGHT, (1, 0), -90),
 207         ):
 208             if key == k:
 209                 if (self._angle == angle and
 210                         self._last_key_down > self._key_rate):
 211                     nx, ny = x + dp[0], y + dp[1]
 212                     if self._can_move(nx, ny):
 213                         self._set_pos(nx, ny)
 214                         offset = (TILE_SIZE * dp[0], TILE_SIZE * dp[1])
 215                         self._set_angle(angle)
 216                         self._last_key_down = 0
 217                         return [MoveViewportEvent(offset)]
 218                 else:
 219                     # just turn
 220                     self._set_angle(angle)
 221
 222     def _activate_key(self):
 223         x, y = self._player_pos
 224         if self._level.is_grate(x, y):
 225             if (self._level_layer == 'floor' and
 226                     self._level.can_crawl(x, y, 'floor')):
 227                 if self._level.can_crawl(x, y, 'tunnels'):
 228                     self._level_layer = 'tunnels'
 229                     self._mode = 'crawl'
 230             elif self._level.can_crawl(x, y, 'floor'):
 231                 # Must be in the tunnels already
 232                 self._level_layer = 'floor'
 233                 self._mode = 'walk'
 234         elif self._level.is_keypad(x, y):
 235             self._level.press_keypad(x, y, self._roaches)
 236         elif self._level.friend_at(x, y):
 237             friend = self._level.friend_at(x, y)
 238             self._level.remove_friend(friend)
 239             self._friends.remove(friend)
 240             self._add_roach()
 241         elif self._level.item_at(x, y):
 242             item = self._level.item_at(x, y)
 243             self._level.remove_item(item)
 244             self._items.remove(item)
 245         elif self._level.is_exit(x, y):
 246             next_level = self._level.get_exit_level()
 247             return [
 248                 WorldEvent('set', {'level.name': next_level}),
 249                 ChangeSceneEvent(GameLevelScene())]
 250
 251     def _fire_key(self, dt):
 252         if self._last_key_down > self._key_rate:
 253             self._last_key_down = 0
 254             print('Boom')
 255
 256     def _vehicle_management_key(self):
 257         from .roach_management import RoachesScene
 258         return [ChangeSceneEvent(RoachesScene(level_scene=self))]
 259
 260     def on_key_down(self, key, mod, unicode):
 261         x, y = self._player_pos
 262         if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 263             self._held_keys.clear()
 264             self._held_keys.add(key)
 265             # We do this so pressing the key has an instant effect, and can
 266             # then be held
 267             self._last_key_down = self._key_rate + 0.01
 268             return self._movement_key(key, 0.01)
 269         elif key == keys.C:
 270             return self._activate_key()
 271         elif key == keys.X:
 272             self._held_keys.clear()
 273             self._held_keys.add(key)
 274             self._last_key_down = self._key_rate + 0.01
 275             return self._fire_key(0.01)
 276         elif key == keys.V:
 277             return self._change_vehicle()
 278         elif key == keys.Z:
 279             return self._vehicle_management_key()
 280         return super(GameLevelScene, self).on_key_down(key, mod, unicode)
 281
 282     def on_key_up(self, key, mode):
 283         self._held_keys.discard(key)
 284         self._last_key_down = 0