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, create_new_item
  11 from ..roaches import build_roach
  12 from ..vehicles.base import Vehicle
  13 from ..weapons import weapon_by_name
  14
  15
  16 class PlayerStats:
  17     def __init__(self, world):
  18         roaches = world.roaches
  19         self.health = sum(r.health for r in roaches)
  20         self.smart = self._count_attr("smart", roaches)
  21         self.fast = self._count_attr("fast", roaches)
  22         self.strong = self._count_attr("strong", roaches)
  23
  24     def __str__(self):
  25         return "<PlayerStats health=%d smart=%d fast=%d strong=%d>" % (
  26             self.health, self.smart, self.fast, self.strong)
  27
  28     def _count_attr(self, attr, roaches):
  29         attrs = [r[attr] for r in roaches]
  30         attrs = [a for a in attrs if a]
  31         return len(attrs)
  32
  33
  34 class BaseLevelScene(Scene):
  35     """ Level scene. """
  36
  37     def __init__(self):
  38         super().__init__()
  39         self._level = None
  40         self._stats = None
  41
  42     def enter(self, world):
  43         self._level = levels.load(world.level.name)
  44         self._tiles = self._level.tiles
  45         self._level_layer = 'floor'
  46         self._surfaces = {}
  47         self._overlay = {}
  48         for layer in ['floor', 'tunnels']:
  49             self._surfaces[layer] = self._render(layer)
  50         self._overlay = self._surfaces['floor'].copy()
  51         self._doors = self.actors.add_layer("doors", level=9)
  52         self._keypads = self.actors.add_layer("keypads", level=8)
  53         self._bullets = self.actors.add_layer("bullets", level=10)
  54         # These are already Actors
  55         for door in self._level.doors:
  56             self._doors.add(door)
  57         for keypad in self._level.keypads:
  58             self._keypads.add(keypad)
  59
  60     def _render(self, layer):
  61         # We cache the rendered surface to avoid doing a large number
  62         # of blits each frame, as that introduces a large performance
  63         # overhead.
  64         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  65                            len(self._tiles) * TILE_SIZE))
  66         layer_key = '%s image' % layer
  67         for y, row in enumerate(self._tiles):
  68             for x, tile in enumerate(row):
  69                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  70                 if layer_key not in tile:
  71                     # Skip broken tiles for now
  72                     continue
  73                 surface.blit(tile[layer_key], pos)
  74         return surface.convert_alpha()
  75
  76     def update(self, world, engine, dt):
  77         """Fix the door and keypad positions"""
  78         super().update(world, engine, dt)
  79         for door in self._doors:
  80             door.pos = self.calc_offset(
  81                 door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  82         for keypad in self._keypads:
  83             keypad.pos = self.calc_offset(
  84                 keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  85
  86     def draw(self, screen):
  87         screen.clear()
  88         # Viewport is the position of the screen relative to the
  89         # surface. We need the position of the surface relative to
  90         # the screen for the blit, so this conversion
  91         viewport = self.viewport
  92         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  93                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  94         if self._level_layer != 'floor':
  95             screen.surface.blit(
  96                 self._overlay, (0, 0),
  97                 area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  98                 special_flags=pgl.BLEND_MULT)
  99         self.actors.draw(screen)
 100
 101     def on_key_down(self, key, mod, unicode):
 102         if key == keys.ESCAPE:
 103             from .menu import MenuScene
 104             return [ChangeSceneEvent(MenuScene())]
 105
 106
 107 class GameLevelScene(BaseLevelScene):
 108
 109     def enter(self, world):
 110         self._held_keys = set()
 111         if self._level is not None:
 112             for generator in self._generators:
 113                 generator.unpause()
 114             return
 115         self._update_player_stats(world)
 116         super().enter(world)
 117         self._roaches = self.actors.add_layer("roaches", level=10)
 118         self._friends = self.actors.add_layer("friendly roaches", level=9)
 119         self._items = self.actors.add_layer("items", level=9)
 120         self._generators = self.actors.add_layer("enemy generators", level=8)
 121         self._enemies = self.actors.add_layer("enemies", level=11)
 122         self._vehicle = Vehicle.current(world)
 123         self._mode = 'walk'
 124         self._angle = 0  # up
 125         self._angle_dp = (0, -1)  # up
 126         self._init_items()
 127         self._init_friendly_roaches()
 128         self._init_generators()
 129         self._key_rate = 0.2
 130         self._last_key_down = 0
 131         return self._init_roaches(world)
 132
 133     def _init_items(self):
 134         for item in self._level.items:
 135             self._items.add(item)
 136
 137     def _init_friendly_roaches(self):
 138         for friend in self._level.friends:
 139             self._friends.add(friend)
 140
 141     def exit(self, world):
 142         for generator in self._generators:
 143             # We don't want these running while we're on other levels, but we
 144             # don't want to delete them here either (because of the vehicle
 145             # management view)
 146             generator.pause()
 147
 148     def _init_generators(self):
 149         for generator in self._level.enemy_generators:
 150             self._generators.add(generator)
 151             generator.unpause()
 152
 153     def _init_roaches(self, world):
 154         x, y = self._level.start_pos
 155         self._level_layer = 'floor'
 156         self._avatar = self._vehicle.get_avatar(world)
 157         self._set_pos(x, y)
 158         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 159         self._roaches.add(self._avatar)
 160         # Fix viewport offset
 161         return [
 162             MoveViewportEvent((
 163                 x * TILE_SIZE - WIDTH // 2,
 164                 y * TILE_SIZE - HEIGHT // 2))]
 165
 166     def _set_pos(self, x, y):
 167         self._player_pos = (x, y)
 168         # print('At ', (x, y))
 169
 170     def _can_move(self, x, y):
 171         if self._mode == 'walk':
 172             if not self._level.enemy_at(x, y):
 173                 return self._level.can_walk(x, y, self._level_layer)
 174             return False
 175         elif self._mode == 'fly':
 176             return self._level.can_fly(x, y, self._level_layer)
 177         elif self._mode == 'crawl':
 178             return self._level.can_crawl(x, y, self._level_layer)
 179
 180     def _set_angle(self, angle, dp):
 181         self._angle = angle
 182         self._angle_dp = dp
 183         self._avatar.angle = angle
 184
 185     @defer_to_update
 186     def _vehicle_changed(self, world):
 187         self._roaches.remove(self._avatar)
 188         self._vehicle = Vehicle.current(world)
 189         self._avatar = self._vehicle.get_avatar(world)
 190         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 191         self._roaches.add(self._avatar)
 192         self._set_angle(self._angle, self._angle_dp)
 193
 194     @defer_to_update
 195     def _add_roach(self, world):
 196         world.roaches.append(build_roach(world))
 197         self._vehicle_changed()
 198
 199     @defer_to_update
 200     def _gain_item(self, world, item):
 201         if item.item_type == "serum":
 202             world.serums.append(item.item_data["serum"])
 203         elif item.item_type == "weapon":
 204             old_weapon = world.weapons.current
 205             world.weapons.current = item.item_data["weapon"]
 206             if old_weapon != "spit":
 207                 clone = clone_old_item(item, weapon=old_weapon)
 208                 self._level.items.append(clone)
 209                 self._items.add(clone)
 210         self._vehicle_changed()
 211
 212     def _hit_enemy(self, enemy, weapon):
 213         enemy.health -= weapon.damage
 214         if enemy.health <= 0:
 215             self._level.remove_enemy(enemy)
 216             self._enemies.remove(enemy)
 217
 218     def _fire_bullet(self, bullet, pos, dp, angle):
 219         if len(self._bullets) >= 10:
 220             return
 221         bullet.game_pos = pos
 222         bullet.game_dp = dp
 223         bullet.dt = 0
 224         bullet.level_layer = self._level_layer
 225         bullet.angle = angle
 226         self._bullets.add(bullet)
 227
 228     def _check_for_bullet_hits(self):
 229         for bullet in list(self._bullets):
 230             for enemy in list(self._enemies):
 231                 if enemy.collidepoint(bullet.pos):
 232                     self._hit_enemy(enemy, bullet.weapon)
 233                     self._bullets.remove(bullet)
 234
 235     def _update_bullet(self, bullet, dt):
 236         bullet.dt += dt
 237         if bullet.dt > 0.1:
 238             bullet.dt = 0
 239             bullet.game_pos = pos = (
 240                 bullet.game_pos[0] + bullet.game_dp[0],
 241                 bullet.game_pos[1] + bullet.game_dp[1])
 242             if not self._level.can_bullet(pos[0], pos[1], bullet.level_layer):
 243                 self._bullets.remove(bullet)
 244
 245     @defer_to_update
 246     def _fire_weapon(self, world):
 247         weapon = weapon_by_name(world.weapons.current)
 248         weapon.play_sound()
 249         if weapon.bullet_range > 0:
 250             self._fire_bullet(
 251                 weapon.assemble_bullet(), self._player_pos, self._angle_dp,
 252                 self._angle)
 253         else:
 254             # melee
 255             pos, dp = self._player_pos, self._angle_dp
 256             pos = (pos[0] + dp[0], pos[1] + dp[1])
 257             enemy = self._level.get_enemy(pos[0], pos[1])
 258             if enemy:
 259                 self._hit_enemy(enemy, weapon)
 260
 261     @defer_to_update
 262     def _change_vehicle(self, world):
 263         x, y = self._player_pos
 264
 265         old_vehicle = world.vehicles.current
 266
 267         item = self._level.item_at(x, y)
 268
 269         if item and item.item_type == "vehicle":
 270             world.vehicles.current = item.item_data["vehicle"]
 271             self._level.remove_item(item)
 272             self._items.remove(item)
 273         else:
 274             world.vehicles.current = "walking"
 275
 276         if old_vehicle != "walking":
 277             dropped_vehicle = create_new_item(
 278                 "vehicle", (x, y), vehicle=old_vehicle)
 279             self._level.items.append(dropped_vehicle)
 280             self._items.add(dropped_vehicle)
 281
 282         self._vehicle_changed()
 283
 284     def update(self, world, engine, dt):
 285         super().update(world, engine, dt)
 286         events = world.pop_events()
 287         for friend in self._friends:
 288             friend.pos = self.calc_offset(
 289                 friend.game_pos[0] * TILE_SIZE, friend.game_pos[1] * TILE_SIZE)
 290         for item in self._items:
 291             item.pos = self.calc_offset(
 292                 item.game_pos[0] * TILE_SIZE, item.game_pos[1] * TILE_SIZE)
 293         self._check_enemies()
 294         for enemy in self._enemies:
 295             enemy.pos = self.calc_offset(
 296                 enemy.game_pos[0] * TILE_SIZE, enemy.game_pos[1] * TILE_SIZE)
 297         for bullet in list(self._bullets):
 298             self._update_bullet(bullet, dt)
 299             bullet.pos = self.calc_offset(
 300                 bullet.game_pos[0] * TILE_SIZE + (TILE_SIZE // 2),
 301                 bullet.game_pos[1] * TILE_SIZE + (TILE_SIZE // 2))
 302         self._check_for_bullet_hits()
 303         self._update_player_stats(world)
 304         more = self._check_held_keys(dt)
 305         if more:
 306             events.extend(more)
 307         return events
 308
 309     def _update_player_stats(self, world):
 310         self._stats = PlayerStats(world)
 311
 312     def _check_enemies(self):
 313         if len(self._level.enemies) != len(self._enemies):
 314             # New nemy has spawned
 315             for enemy in self._level.enemies:
 316                 if enemy not in self._enemies:
 317                     self._enemies.add(enemy)
 318
 319     def _check_held_keys(self, dt):
 320         for key in self._held_keys:
 321             self._last_key_down += dt
 322             if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 323                 return self._movement_key(key, dt)
 324             elif key == keys.X:
 325                 return self._fire_key(dt)
 326
 327     def _movement_key(self, key, dt):
 328         x, y = self._player_pos
 329         for k, dp, angle in (
 330             (keys.DOWN, (0, 1), 180),
 331             (keys.UP, (0, -1), 0),
 332             (keys.LEFT, (-1, 0), 90),
 333             (keys.RIGHT, (1, 0), -90),
 334         ):
 335             if key == k:
 336                 if (self._angle == angle and
 337                         self._last_key_down > self._key_rate):
 338                     nx, ny = x + dp[0], y + dp[1]
 339                     if self._can_move(nx, ny):
 340                         self._set_pos(nx, ny)
 341                         offset = (TILE_SIZE * dp[0], TILE_SIZE * dp[1])
 342                         self._set_angle(angle, dp)
 343                         self._last_key_down = 0
 344                         return [MoveViewportEvent(offset)]
 345                 else:
 346                     # just turn
 347                     self._set_angle(angle, dp)
 348
 349     def _activate_key(self):
 350         x, y = self._player_pos
 351         if self._level.is_grate(x, y):
 352             if (self._level_layer == 'floor' and
 353                     self._level.can_crawl(x, y, 'floor')):
 354                 if self._level.can_crawl(x, y, 'tunnels'):
 355                     self._level_layer = 'tunnels'
 356                     self._mode = 'crawl'
 357             elif self._level.can_crawl(x, y, 'floor'):
 358                 # Must be in the tunnels already
 359                 self._level_layer = 'floor'
 360                 self._mode = 'walk'
 361         elif self._level.is_keypad(x, y):
 362             self._level.press_keypad(x, y, self._roaches)
 363         elif self._level.friend_at(x, y):
 364             friend = self._level.friend_at(x, y)
 365             self._level.remove_friend(friend)
 366             self._friends.remove(friend)
 367             self._add_roach()
 368         elif self._level.item_at(x, y):
 369             item = self._level.item_at(x, y)
 370             if item.item_type != "vehicle":
 371                 self._level.remove_item(item)
 372                 self._items.remove(item)
 373                 self._gain_item(item)
 374         elif self._level.is_exit(x, y):
 375             next_level = self._level.get_exit_level()
 376             return [
 377                 WorldEvent('set', {'level.name': next_level}),
 378                 ChangeSceneEvent(GameLevelScene())]
 379
 380     def _fire_key(self, dt):
 381         if self._last_key_down > self._key_rate:
 382             self._last_key_down = 0
 383             self._fire_weapon()
 384
 385     def _vehicle_management_key(self):
 386         from .roach_management import RoachesScene
 387         return [ChangeSceneEvent(RoachesScene(level_scene=self))]
 388
 389     def on_key_down(self, key, mod, unicode):
 390         x, y = self._player_pos
 391         if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 392             firing = (keys.X in self._held_keys)
 393             self._held_keys.clear()
 394             self._held_keys.add(key)
 395             if firing:
 396                 self._held_keys.add(keys.X)
 397             # We do this so pressing the key has an instant effect, and can
 398             # then be held
 399             self._last_key_down = self._key_rate + 0.01
 400             return self._movement_key(key, 0.01)
 401         elif key == keys.C:
 402             return self._activate_key()
 403         elif key == keys.X:
 404             self._held_keys.clear()
 405             self._held_keys.add(key)
 406             self._last_key_down = self._key_rate + 0.01
 407             return self._fire_key(0.01)
 408         elif key == keys.V:
 409             return self._change_vehicle()
 410         elif key == keys.Z:
 411             return self._vehicle_management_key()
 412         return super(GameLevelScene, self).on_key_down(key, mod, unicode)
 413
 414     def on_key_up(self, key, mode):
 415         self._held_keys.discard(key)
 416         self._last_key_down = 0