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 ..gamelib.items import clone_old_item
  11 from ..roaches import build_roach
  12 from ..vehicles.base import Vehicle
  13
  14
  15 class BaseLevelScene(Scene):
  16     """ Level scene. """
  17
  18     def __init__(self):
  19         super().__init__()
  20         self._level = None
  21
  22     def enter(self, world):
  23         self._level = levels.load(world.level.name)
  24         self._tiles = self._level.tiles
  25         self._level_layer = 'floor'
  26         self._surfaces = {}
  27         self._overlay = {}
  28         for layer in ['floor', 'tunnels']:
  29             self._surfaces[layer] = self._render(layer)
  30         self._overlay = self._surfaces['floor'].copy()
  31         self._doors = self.actors.add_layer("doors", level=9)
  32         self._keypads = self.actors.add_layer("keypads", level=8)
  33         # These are already Actors
  34         for door in self._level.doors:
  35             self._doors.add(door)
  36         for keypad in self._level.keypads:
  37             self._keypads.add(keypad)
  38
  39     def _render(self, layer):
  40         # We cache the rendered surface to avoid doing a large number
  41         # of blits each frame, as that introduces a large performance
  42         # overhead.
  43         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  44                            len(self._tiles) * TILE_SIZE))
  45         layer_key = '%s image' % layer
  46         for y, row in enumerate(self._tiles):
  47             for x, tile in enumerate(row):
  48                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  49                 if layer_key not in tile:
  50                     # Skip broken tiles for now
  51                     continue
  52                 surface.blit(tile[layer_key], pos)
  53         return surface.convert_alpha()
  54
  55     def update(self, world, engine, dt):
  56         """Fix the door and keypad positions"""
  57         super().update(world, engine, dt)
  58         for door in self._doors:
  59             door.pos = self.calc_offset(
  60                 door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  61         for keypad in self._keypads:
  62             keypad.pos = self.calc_offset(
  63                 keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  64
  65     def draw(self, screen):
  66         screen.clear()
  67         # Viewport is the position of the screen relative to the
  68         # surface. We need the position of the surface relative to
  69         # the screen for the blit, so this conversion
  70         viewport = self.viewport
  71         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  72                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  73         if self._level_layer != 'floor':
  74             screen.surface.blit(
  75                 self._overlay, (0, 0),
  76                 area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  77                 special_flags=pgl.BLEND_MULT)
  78         self.actors.draw(screen)
  79
  80     def on_key_down(self, key, mod, unicode):
  81         if key == keys.ESCAPE:
  82             from .menu import MenuScene
  83             return [ChangeSceneEvent(MenuScene())]
  84
  85
  86 class GameLevelScene(BaseLevelScene):
  87
  88     def enter(self, world):
  89         self._held_keys = set()
  90         if self._level is not None:
  91             for generator in self._generators:
  92                 generator.unpause()
  93             return
  94         super().enter(world)
  95         self._roaches = self.actors.add_layer("roaches", level=10)
  96         self._friends = self.actors.add_layer("friendly roaches", level=9)
  97         self._items = self.actors.add_layer("items", level=9)
  98         self._generators = self.actors.add_layer("enemy generators", level=8)
  99         self._enemies = self.actors.add_layer("enemies", level=7)
 100         self._vehicle = Vehicle.current(world)
 101         self._mode = 'walk'
 102         self._angle = 0
 103         self._init_items()
 104         self._init_friendly_roaches()
 105         self._init_generators()
 106         self._key_rate = 0.2
 107         self._last_key_down = 0
 108         return self._init_roaches(world)
 109
 110     def _init_items(self):
 111         for item in self._level.items:
 112             self._items.add(item)
 113
 114     def _init_friendly_roaches(self):
 115         for friend in self._level.friends:
 116             self._friends.add(friend)
 117
 118     def exit(self, world):
 119         for generator in self._generators:
 120             # We don't want these running while we're on other levels, but we
 121             # don't want to delete them here either (because of the vehicle
 122             # management view)
 123             generator.pause()
 124
 125     def _init_generators(self):
 126         for generator in self._level.enemy_generators:
 127             self._generators.add(generator)
 128             generator.unpause()
 129
 130     def _init_roaches(self, world):
 131         x, y = self._level.start_pos
 132         self._level_layer = 'floor'
 133         self._avatar = self._vehicle.get_avatar(world)
 134         self._set_pos(x, y)
 135         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 136         self._roaches.add(self._avatar)
 137         # Fix viewport offset
 138         return [
 139             MoveViewportEvent((
 140                 x * TILE_SIZE - WIDTH // 2,
 141                 y * TILE_SIZE - HEIGHT // 2))]
 142
 143     def _set_pos(self, x, y):
 144         self._player_pos = (x, y)
 145         # print('At ', (x, y))
 146
 147     def _can_move(self, x, y):
 148         if self._mode == 'walk':
 149             if not self._level.enemy_at(x, y):
 150                 return self._level.can_walk(x, y, self._level_layer)
 151             return False
 152         elif self._mode == 'fly':
 153             return self._level.can_fly(x, y, self._level_layer)
 154         elif self._mode == 'crawl':
 155             return self._level.can_crawl(x, y, self._level_layer)
 156
 157     def _set_angle(self, angle):
 158         self._angle = angle
 159         self._avatar.angle = angle
 160
 161     @defer_to_update
 162     def _vehicle_changed(self, world):
 163         self._roaches.remove(self._avatar)
 164         self._vehicle = Vehicle.current(world)
 165         self._avatar = self._vehicle.get_avatar(world)
 166         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 167         self._roaches.add(self._avatar)
 168         self._set_angle(self._angle)
 169
 170     @defer_to_update
 171     def _add_roach(self, world):
 172         world.roaches.append(build_roach(world))
 173         self._vehicle_changed()
 174
 175     @defer_to_update
 176     def _gain_item(self, world, item):
 177         if item.item_type == "serum":
 178             world.serums.append(item.item_data["serum"])
 179         elif item.item_type == "weapon":
 180             old_weapon = world.weapons.current
 181             world.weapons.current = item.item_data["weapon"]
 182             if old_weapon != "spit":
 183                 clone = clone_old_item(item, weapon=old_weapon)
 184                 self._level.items.append(clone)
 185                 self._items.add(clone)
 186         self._vehicle_changed()
 187
 188     @defer_to_update
 189     def _change_vehicle(self, world):
 190         vehicle = Vehicle.random()
 191         world.vehicles.current = vehicle
 192         self._vehicle_changed()
 193
 194     def update(self, world, engine, dt):
 195         super().update(world, engine, dt)
 196         events = world.pop_events()
 197         for friend in self._friends:
 198             friend.pos = self.calc_offset(
 199                 friend.game_pos[0] * TILE_SIZE, friend.game_pos[1] * TILE_SIZE)
 200         for item in self._items:
 201             item.pos = self.calc_offset(
 202                 item.game_pos[0] * TILE_SIZE, item.game_pos[1] * TILE_SIZE)
 203         self._check_enemies()
 204         for enemy in self._enemies:
 205             enemy.pos = self.calc_offset(
 206                 enemy.game_pos[0] * TILE_SIZE, enemy.game_pos[1] * TILE_SIZE)
 207         more = self._check_held_keys(dt)
 208         if more:
 209             events.extend(more)
 210         return events
 211
 212     def _check_enemies(self):
 213         if len(self._level.enemies) != len(self._enemies):
 214             # New nemy has spawned
 215             for enemy in self._level.enemies:
 216                 if enemy not in self._enemies:
 217                     self._enemies.add(enemy)
 218
 219     def _check_held_keys(self, dt):
 220         for key in self._held_keys:
 221             self._last_key_down += dt
 222             if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 223                 return self._movement_key(key, dt)
 224             elif key == keys.X:
 225                 return self._fire_key(dt)
 226
 227     def _movement_key(self, key, dt):
 228         x, y = self._player_pos
 229         for k, dp, angle in (
 230             (keys.DOWN, (0, 1), 180),
 231             (keys.UP, (0, -1), 0),
 232             (keys.LEFT, (-1, 0), 90),
 233             (keys.RIGHT, (1, 0), -90),
 234         ):
 235             if key == k:
 236                 if (self._angle == angle and
 237                         self._last_key_down > self._key_rate):
 238                     nx, ny = x + dp[0], y + dp[1]
 239                     if self._can_move(nx, ny):
 240                         self._set_pos(nx, ny)
 241                         offset = (TILE_SIZE * dp[0], TILE_SIZE * dp[1])
 242                         self._set_angle(angle)
 243                         self._last_key_down = 0
 244                         return [MoveViewportEvent(offset)]
 245                 else:
 246                     # just turn
 247                     self._set_angle(angle)
 248
 249     def _activate_key(self):
 250         x, y = self._player_pos
 251         if self._level.is_grate(x, y):
 252             if (self._level_layer == 'floor' and
 253                     self._level.can_crawl(x, y, 'floor')):
 254                 if self._level.can_crawl(x, y, 'tunnels'):
 255                     self._level_layer = 'tunnels'
 256                     self._mode = 'crawl'
 257             elif self._level.can_crawl(x, y, 'floor'):
 258                 # Must be in the tunnels already
 259                 self._level_layer = 'floor'
 260                 self._mode = 'walk'
 261         elif self._level.is_keypad(x, y):
 262             self._level.press_keypad(x, y, self._roaches)
 263         elif self._level.friend_at(x, y):
 264             friend = self._level.friend_at(x, y)
 265             self._level.remove_friend(friend)
 266             self._friends.remove(friend)
 267             self._add_roach()
 268         elif self._level.item_at(x, y):
 269             item = self._level.item_at(x, y)
 270             self._level.remove_item(item)
 271             self._items.remove(item)
 272             self._gain_item(item)
 273         elif self._level.is_exit(x, y):
 274             next_level = self._level.get_exit_level()
 275             return [
 276                 WorldEvent('set', {'level.name': next_level}),
 277                 ChangeSceneEvent(GameLevelScene())]
 278
 279     def _fire_key(self, dt):
 280         if self._last_key_down > self._key_rate:
 281             self._last_key_down = 0
 282             print('Boom')
 283
 284     def _vehicle_management_key(self):
 285         from .roach_management import RoachesScene
 286         return [ChangeSceneEvent(RoachesScene(level_scene=self))]
 287
 288     def on_key_down(self, key, mod, unicode):
 289         x, y = self._player_pos
 290         if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 291             self._held_keys.clear()
 292             self._held_keys.add(key)
 293             # We do this so pressing the key has an instant effect, and can
 294             # then be held
 295             self._last_key_down = self._key_rate + 0.01
 296             return self._movement_key(key, 0.01)
 297         elif key == keys.C:
 298             return self._activate_key()
 299         elif key == keys.X:
 300             self._held_keys.clear()
 301             self._held_keys.add(key)
 302             self._last_key_down = self._key_rate + 0.01
 303             return self._fire_key(0.01)
 304         elif key == keys.V:
 305             return self._change_vehicle()
 306         elif key == keys.Z:
 307             return self._vehicle_management_key()
 308         return super(GameLevelScene, self).on_key_down(key, mod, unicode)
 309
 310     def on_key_up(self, key, mode):
 311         self._held_keys.discard(key)
 312         self._last_key_down = 0