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 ..hud import HudActor
  12 from ..roaches import build_roach
  13 from ..vehicles.base import Vehicle
  14 from ..weapons import weapon_by_name
  15
  16
  17 class PlayerStats:
  18     def __init__(self, world):
  19         roaches = world.roaches
  20         self.health = sum(r.health for r in roaches)
  21         self.smart = self._count_attr("smart", roaches)
  22         self.fast = self._count_attr("fast", roaches)
  23         self.strong = self._count_attr("strong", roaches)
  24
  25     def __str__(self):
  26         return "<PlayerStats health=%d smart=%d fast=%d strong=%d>" % (
  27             self.health, self.smart, self.fast, self.strong)
  28
  29     def __eq__(self, other):
  30         if not isinstance(other, PlayerStats):
  31             return NotImplemented
  32         return all(
  33             (self.health == other.health, self.smart == other.smart,
  34              self.fast == other.fast, self.strong == other.strong))
  35
  36     def _count_attr(self, attr, roaches):
  37         attrs = [r[attr] for r in roaches]
  38         attrs = [a for a in attrs if a]
  39         return len(attrs)
  40
  41
  42 class BaseLevelScene(Scene):
  43     """ Level scene. """
  44
  45     def __init__(self):
  46         super().__init__()
  47         self._level = None
  48         self._stats = None
  49
  50     def enter(self, world):
  51         self._level = levels.load(world.level.name)
  52         self._tiles = self._level.tiles
  53         self._level_layer = 'floor'
  54         self._surfaces = {}
  55         self._overlay = {}
  56         for layer in ['floor', 'tunnels']:
  57             self._surfaces[layer] = self._render(layer)
  58         self._overlay = self._surfaces['floor'].copy()
  59         self._doors = self.actors.add_layer("doors", level=9)
  60         self._keypads = self.actors.add_layer("keypads", level=8)
  61         self._bullets = self.actors.add_layer("bullets", level=10)
  62         # These are already Actors
  63         for door in self._level.doors:
  64             self._doors.add(door)
  65         for keypad in self._level.keypads:
  66             self._keypads.add(keypad)
  67
  68     def _render(self, layer):
  69         # We cache the rendered surface to avoid doing a large number
  70         # of blits each frame, as that introduces a large performance
  71         # overhead.
  72         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  73                            len(self._tiles) * TILE_SIZE))
  74         layer_key = '%s image' % layer
  75         for y, row in enumerate(self._tiles):
  76             for x, tile in enumerate(row):
  77                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  78                 if layer_key not in tile:
  79                     # Skip broken tiles for now
  80                     continue
  81                 surface.blit(tile[layer_key], pos)
  82         return surface.convert_alpha()
  83
  84     def update(self, world, engine, dt):
  85         """Fix the door and keypad positions"""
  86         super().update(world, engine, dt)
  87         for door in self._doors:
  88             door.pos = self.calc_offset(
  89                 door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  90         for keypad in self._keypads:
  91             keypad.pos = self.calc_offset(
  92                 keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  93
  94     def draw(self, screen):
  95         screen.clear()
  96         # Viewport is the position of the screen relative to the
  97         # surface. We need the position of the surface relative to
  98         # the screen for the blit, so this conversion
  99         viewport = self.viewport
 100         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
 101                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
 102         if self._level_layer != 'floor':
 103             screen.surface.blit(
 104                 self._overlay, (0, 0),
 105                 area=(viewport[0], viewport[1], WIDTH, HEIGHT),
 106                 special_flags=pgl.BLEND_MULT)
 107         self.actors.draw(screen)
 108
 109     def on_key_down(self, key, mod, unicode):
 110         if key == keys.ESCAPE:
 111             from .menu import MenuScene
 112             return [ChangeSceneEvent(MenuScene())]
 113
 114
 115 class GameLevelScene(BaseLevelScene):
 116
 117     def enter(self, world):
 118         self._held_keys = set()
 119         if self._level is not None:
 120             for generator in self._generators:
 121                 generator.unpause()
 122             return
 123         self._update_player_stats(world)
 124         super().enter(world)
 125         self._roaches = self.actors.add_layer("roaches", level=10)
 126         self._friends = self.actors.add_layer("friendly roaches", level=9)
 127         self._items = self.actors.add_layer("items", level=9)
 128         self._generators = self.actors.add_layer("enemy generators", level=8)
 129         self._enemies = self.actors.add_layer("enemies", level=11)
 130         self._hud = self.actors.add_layer("hud", level=12)
 131         self._hud.add(HudActor(
 132             self._stats, anchor=("right", "bottom"), pos=(WIDTH, HEIGHT)))
 133         self._vehicle = Vehicle.current(world)
 134         self._mode = 'walk'
 135         self._angle = 0  # up
 136         self._angle_dp = (0, -1)  # up
 137         self._init_items()
 138         self._init_friendly_roaches()
 139         self._init_generators()
 140         self._key_rate = 0.2
 141         self._last_key_down = 0
 142         return self._init_roaches(world)
 143
 144     def _init_items(self):
 145         for item in self._level.items:
 146             self._items.add(item)
 147
 148     def _init_friendly_roaches(self):
 149         for friend in self._level.friends:
 150             self._friends.add(friend)
 151
 152     def exit(self, world):
 153         for generator in self._generators:
 154             # We don't want these running while we're on other levels, but we
 155             # don't want to delete them here either (because of the vehicle
 156             # management view)
 157             generator.pause()
 158
 159     def _init_generators(self):
 160         for generator in self._level.enemy_generators:
 161             self._generators.add(generator)
 162             generator.unpause()
 163
 164     def _init_roaches(self, world):
 165         x, y = self._level.start_pos
 166         self._level_layer = 'floor'
 167         self._avatar = self._vehicle.get_avatar(world)
 168         self._set_pos(x, y)
 169         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 170         self._roaches.add(self._avatar)
 171         # Fix viewport offset
 172         return [
 173             MoveViewportEvent((
 174                 x * TILE_SIZE - WIDTH // 2,
 175                 y * TILE_SIZE - HEIGHT // 2))]
 176
 177     def _set_pos(self, x, y):
 178         self._player_pos = (x, y)
 179         # print('At ', (x, y))
 180
 181     def _can_move(self, x, y):
 182         if self._mode == 'walk':
 183             if not self._level.enemy_at(x, y):
 184                 return self._level.can_walk(x, y, self._level_layer)
 185             return False
 186         elif self._mode == 'fly':
 187             return self._level.can_fly(x, y, self._level_layer)
 188         elif self._mode == 'crawl':
 189             return self._level.can_crawl(x, y, self._level_layer)
 190
 191     def _set_angle(self, angle, dp):
 192         self._angle = angle
 193         self._angle_dp = dp
 194         self._avatar.angle = angle
 195
 196     @defer_to_update
 197     def _vehicle_changed(self, world):
 198         self._roaches.remove(self._avatar)
 199         self._vehicle = Vehicle.current(world)
 200         self._avatar = self._vehicle.get_avatar(world)
 201         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 202         self._roaches.add(self._avatar)
 203         self._set_angle(self._angle, self._angle_dp)
 204
 205     @defer_to_update
 206     def _add_roach(self, world):
 207         world.roaches.append(build_roach(world))
 208         self._vehicle_changed()
 209
 210     @defer_to_update
 211     def _gain_item(self, world, item):
 212         if item.item_type == "serum":
 213             world.serums.append(item.item_data["serum"])
 214         elif item.item_type == "weapon":
 215             old_weapon = world.weapons.current
 216             world.weapons.current = item.item_data["weapon"]
 217             if old_weapon != "spit":
 218                 clone = clone_old_item(item, weapon=old_weapon)
 219                 self._level.items.append(clone)
 220                 self._items.add(clone)
 221         self._vehicle_changed()
 222
 223     def _hit_enemy(self, enemy, weapon):
 224         enemy.health -= weapon.damage
 225         if enemy.health <= 0:
 226             self._level.remove_enemy(enemy)
 227             self._enemies.remove(enemy)
 228
 229     def _fire_bullet(self, bullet, pos, dp, angle):
 230         if len(self._bullets) >= 10:
 231             return
 232         bullet.game_pos = pos
 233         bullet.game_dp = dp
 234         bullet.dt = 0
 235         bullet.level_layer = self._level_layer
 236         bullet.angle = angle
 237         self._bullets.add(bullet)
 238
 239     def _check_for_bullet_hits(self):
 240         for bullet in list(self._bullets):
 241             for enemy in list(self._enemies):
 242                 if enemy.collidepoint(bullet.pos):
 243                     self._hit_enemy(enemy, bullet.weapon)
 244                     self._bullets.remove(bullet)
 245
 246     def _update_bullet(self, bullet, dt):
 247         bullet.dt += dt
 248         if bullet.dt > 0.1:
 249             bullet.dt = 0
 250             bullet.game_pos = pos = (
 251                 bullet.game_pos[0] + bullet.game_dp[0],
 252                 bullet.game_pos[1] + bullet.game_dp[1])
 253             if not self._level.can_bullet(pos[0], pos[1], bullet.level_layer):
 254                 self._bullets.remove(bullet)
 255
 256     @defer_to_update
 257     def _fire_weapon(self, world):
 258         weapon = weapon_by_name(world.weapons.current)
 259         weapon.play_sound()
 260         if weapon.bullet_range > 0:
 261             self._fire_bullet(
 262                 weapon.assemble_bullet(), self._player_pos, self._angle_dp,
 263                 self._angle)
 264         else:
 265             # melee
 266             pos, dp = self._player_pos, self._angle_dp
 267             pos = (pos[0] + dp[0], pos[1] + dp[1])
 268             enemy = self._level.get_enemy(pos[0], pos[1])
 269             if enemy:
 270                 self._hit_enemy(enemy, weapon)
 271
 272     @defer_to_update
 273     def _change_vehicle(self, world):
 274         x, y = self._player_pos
 275
 276         old_vehicle = world.vehicles.current
 277
 278         item = self._level.item_at(x, y)
 279
 280         if item and item.item_type == "vehicle":
 281             world.vehicles.current = item.item_data["vehicle"]
 282             self._level.remove_item(item)
 283             self._items.remove(item)
 284         else:
 285             world.vehicles.current = "walking"
 286
 287         if old_vehicle != "walking":
 288             dropped_vehicle = create_new_item(
 289                 "vehicle", (x, y), vehicle=old_vehicle)
 290             self._level.items.append(dropped_vehicle)
 291             self._items.add(dropped_vehicle)
 292
 293         self._vehicle_changed()
 294
 295     def update(self, world, engine, dt):
 296         super().update(world, engine, dt)
 297         events = world.pop_events()
 298         for friend in self._friends:
 299             friend.pos = self.calc_offset(
 300                 friend.game_pos[0] * TILE_SIZE, friend.game_pos[1] * TILE_SIZE)
 301         for item in self._items:
 302             item.pos = self.calc_offset(
 303                 item.game_pos[0] * TILE_SIZE, item.game_pos[1] * TILE_SIZE)
 304         self._check_enemies()
 305         for enemy in self._enemies:
 306             enemy.pos = self.calc_offset(
 307                 enemy.game_pos[0] * TILE_SIZE, enemy.game_pos[1] * TILE_SIZE)
 308         for bullet in list(self._bullets):
 309             self._update_bullet(bullet, dt)
 310             bullet.pos = self.calc_offset(
 311                 bullet.game_pos[0] * TILE_SIZE + (TILE_SIZE // 2),
 312                 bullet.game_pos[1] * TILE_SIZE + (TILE_SIZE // 2))
 313         self._check_for_bullet_hits()
 314         self._update_player_stats(world)
 315         self._hud[0].stats = self._stats
 316         more = self._check_held_keys(dt)
 317         if more:
 318             events.extend(more)
 319         return events
 320
 321     def _update_player_stats(self, world):
 322         self._stats = PlayerStats(world)
 323
 324     def _check_enemies(self):
 325         if len(self._level.enemies) != len(self._enemies):
 326             # New nemy has spawned
 327             for enemy in self._level.enemies:
 328                 if enemy not in self._enemies:
 329                     self._enemies.add(enemy)
 330
 331     def _check_held_keys(self, dt):
 332         for key in self._held_keys:
 333             self._last_key_down += dt
 334             if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 335                 return self._movement_key(key, dt)
 336             elif key == keys.X:
 337                 return self._fire_key(dt)
 338
 339     def _movement_key(self, key, dt):
 340         x, y = self._player_pos
 341         for k, dp, angle in (
 342             (keys.DOWN, (0, 1), 180),
 343             (keys.UP, (0, -1), 0),
 344             (keys.LEFT, (-1, 0), 90),
 345             (keys.RIGHT, (1, 0), -90),
 346         ):
 347             if key == k:
 348                 if (self._angle == angle and
 349                         self._last_key_down > self._key_rate):
 350                     nx, ny = x + dp[0], y + dp[1]
 351                     if self._can_move(nx, ny):
 352                         self._set_pos(nx, ny)
 353                         offset = (TILE_SIZE * dp[0], TILE_SIZE * dp[1])
 354                         self._set_angle(angle, dp)
 355                         self._last_key_down = 0
 356                         return [MoveViewportEvent(offset)]
 357                 else:
 358                     # just turn
 359                     self._set_angle(angle, dp)
 360
 361     def _activate_key(self):
 362         x, y = self._player_pos
 363         if self._level.is_grate(x, y):
 364             if (self._level_layer == 'floor' and
 365                     self._level.can_crawl(x, y, 'floor')):
 366                 if self._level.can_crawl(x, y, 'tunnels'):
 367                     self._level_layer = 'tunnels'
 368                     self._mode = 'crawl'
 369             elif self._level.can_crawl(x, y, 'floor'):
 370                 # Must be in the tunnels already
 371                 self._level_layer = 'floor'
 372                 self._mode = 'walk'
 373         elif self._level.is_keypad(x, y):
 374             self._level.press_keypad(x, y, self._roaches)
 375         elif self._level.friend_at(x, y):
 376             friend = self._level.friend_at(x, y)
 377             self._level.remove_friend(friend)
 378             self._friends.remove(friend)
 379             self._add_roach()
 380         elif self._level.item_at(x, y):
 381             item = self._level.item_at(x, y)
 382             if item.item_type != "vehicle":
 383                 self._level.remove_item(item)
 384                 self._items.remove(item)
 385                 self._gain_item(item)
 386         elif self._level.is_exit(x, y):
 387             next_level = self._level.get_exit_level()
 388             return [
 389                 WorldEvent('set', {'level.name': next_level}),
 390                 ChangeSceneEvent(GameLevelScene())]
 391
 392     def _fire_key(self, dt):
 393         if self._last_key_down > self._key_rate:
 394             self._last_key_down = 0
 395             self._fire_weapon()
 396
 397     def _vehicle_management_key(self):
 398         from .roach_management import RoachesScene
 399         return [ChangeSceneEvent(RoachesScene(level_scene=self))]
 400
 401     def on_key_down(self, key, mod, unicode):
 402         x, y = self._player_pos
 403         if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 404             firing = (keys.X in self._held_keys)
 405             self._held_keys.clear()
 406             self._held_keys.add(key)
 407             if firing:
 408                 self._held_keys.add(keys.X)
 409             # We do this so pressing the key has an instant effect, and can
 410             # then be held
 411             self._last_key_down = self._key_rate + 0.01
 412             return self._movement_key(key, 0.01)
 413         elif key == keys.C:
 414             return self._activate_key()
 415         elif key == keys.X:
 416             self._held_keys.clear()
 417             self._held_keys.add(key)
 418             self._last_key_down = self._key_rate + 0.01
 419             return self._fire_key(0.01)
 420         elif key == keys.V:
 421             return self._change_vehicle()
 422         elif key == keys.Z:
 423             return self._vehicle_management_key()
 424         return super(GameLevelScene, self).on_key_down(key, mod, unicode)
 425
 426     def on_key_up(self, key, mode):
 427         self._held_keys.discard(key)
 428         self._last_key_down = 0