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 from ..weapons import weapon_by_name
  14
  15
  16 class BaseLevelScene(Scene):
  17     """ Level scene. """
  18
  19     def __init__(self):
  20         super().__init__()
  21         self._level = None
  22
  23     def enter(self, world):
  24         self._level = levels.load(world.level.name)
  25         self._tiles = self._level.tiles
  26         self._level_layer = 'floor'
  27         self._surfaces = {}
  28         self._overlay = {}
  29         for layer in ['floor', 'tunnels']:
  30             self._surfaces[layer] = self._render(layer)
  31         self._overlay = self._surfaces['floor'].copy()
  32         self._doors = self.actors.add_layer("doors", level=9)
  33         self._keypads = self.actors.add_layer("keypads", level=8)
  34         self._bullets = self.actors.add_layer("bullets", level=10)
  35         # These are already Actors
  36         for door in self._level.doors:
  37             self._doors.add(door)
  38         for keypad in self._level.keypads:
  39             self._keypads.add(keypad)
  40
  41     def _render(self, layer):
  42         # We cache the rendered surface to avoid doing a large number
  43         # of blits each frame, as that introduces a large performance
  44         # overhead.
  45         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  46                            len(self._tiles) * TILE_SIZE))
  47         layer_key = '%s image' % layer
  48         for y, row in enumerate(self._tiles):
  49             for x, tile in enumerate(row):
  50                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  51                 if layer_key not in tile:
  52                     # Skip broken tiles for now
  53                     continue
  54                 surface.blit(tile[layer_key], pos)
  55         return surface.convert_alpha()
  56
  57     def update(self, world, engine, dt):
  58         """Fix the door and keypad positions"""
  59         super().update(world, engine, dt)
  60         for door in self._doors:
  61             door.pos = self.calc_offset(
  62                 door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  63         for keypad in self._keypads:
  64             keypad.pos = self.calc_offset(
  65                 keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  66
  67     def draw(self, screen):
  68         screen.clear()
  69         # Viewport is the position of the screen relative to the
  70         # surface. We need the position of the surface relative to
  71         # the screen for the blit, so this conversion
  72         viewport = self.viewport
  73         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  74                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  75         if self._level_layer != 'floor':
  76             screen.surface.blit(
  77                 self._overlay, (0, 0),
  78                 area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  79                 special_flags=pgl.BLEND_MULT)
  80         self.actors.draw(screen)
  81
  82     def on_key_down(self, key, mod, unicode):
  83         if key == keys.ESCAPE:
  84             from .menu import MenuScene
  85             return [ChangeSceneEvent(MenuScene())]
  86
  87
  88 class GameLevelScene(BaseLevelScene):
  89
  90     def enter(self, world):
  91         self._held_keys = set()
  92         if self._level is not None:
  93             for generator in self._generators:
  94                 generator.unpause()
  95             return
  96         super().enter(world)
  97         self._roaches = self.actors.add_layer("roaches", level=10)
  98         self._friends = self.actors.add_layer("friendly roaches", level=9)
  99         self._items = self.actors.add_layer("items", level=9)
 100         self._generators = self.actors.add_layer("enemy generators", level=8)
 101         self._enemies = self.actors.add_layer("enemies", level=7)
 102         self._vehicle = Vehicle.current(world)
 103         self._mode = 'walk'
 104         self._angle = 0  # up
 105         self._angle_dp = (0, -1)  # up
 106         self._init_items()
 107         self._init_friendly_roaches()
 108         self._init_generators()
 109         self._key_rate = 0.2
 110         self._last_key_down = 0
 111         return self._init_roaches(world)
 112
 113     def _init_items(self):
 114         for item in self._level.items:
 115             self._items.add(item)
 116
 117     def _init_friendly_roaches(self):
 118         for friend in self._level.friends:
 119             self._friends.add(friend)
 120
 121     def exit(self, world):
 122         for generator in self._generators:
 123             # We don't want these running while we're on other levels, but we
 124             # don't want to delete them here either (because of the vehicle
 125             # management view)
 126             generator.pause()
 127
 128     def _init_generators(self):
 129         for generator in self._level.enemy_generators:
 130             self._generators.add(generator)
 131             generator.unpause()
 132
 133     def _init_roaches(self, world):
 134         x, y = self._level.start_pos
 135         self._level_layer = 'floor'
 136         self._avatar = self._vehicle.get_avatar(world)
 137         self._set_pos(x, y)
 138         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 139         self._roaches.add(self._avatar)
 140         # Fix viewport offset
 141         return [
 142             MoveViewportEvent((
 143                 x * TILE_SIZE - WIDTH // 2,
 144                 y * TILE_SIZE - HEIGHT // 2))]
 145
 146     def _set_pos(self, x, y):
 147         self._player_pos = (x, y)
 148         # print('At ', (x, y))
 149
 150     def _can_move(self, x, y):
 151         if self._mode == 'walk':
 152             if not self._level.enemy_at(x, y):
 153                 return self._level.can_walk(x, y, self._level_layer)
 154             return False
 155         elif self._mode == 'fly':
 156             return self._level.can_fly(x, y, self._level_layer)
 157         elif self._mode == 'crawl':
 158             return self._level.can_crawl(x, y, self._level_layer)
 159
 160     def _set_angle(self, angle, dp):
 161         self._angle = angle
 162         self._angle_dp = dp
 163         self._avatar.angle = angle
 164
 165     @defer_to_update
 166     def _vehicle_changed(self, world):
 167         self._roaches.remove(self._avatar)
 168         self._vehicle = Vehicle.current(world)
 169         self._avatar = self._vehicle.get_avatar(world)
 170         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 171         self._roaches.add(self._avatar)
 172         self._set_angle(self._angle, self._angle_dp)
 173
 174     @defer_to_update
 175     def _add_roach(self, world):
 176         world.roaches.append(build_roach(world))
 177         self._vehicle_changed()
 178
 179     @defer_to_update
 180     def _gain_item(self, world, item):
 181         if item.item_type == "serum":
 182             world.serums.append(item.item_data["serum"])
 183         elif item.item_type == "weapon":
 184             old_weapon = world.weapons.current
 185             world.weapons.current = item.item_data["weapon"]
 186             if old_weapon != "spit":
 187                 clone = clone_old_item(item, weapon=old_weapon)
 188                 self._level.items.append(clone)
 189                 self._items.add(clone)
 190         self._vehicle_changed()
 191
 192     def _hit_enemy(self, enemy, weapon):
 193         enemy.health -= weapon.damage
 194         if enemy.health <= 0:
 195             self._level.remove_enemy(enemy)
 196             self._enemies.remove(enemy)
 197
 198     def _fire_bullet(self, bullet, pos, dp):
 199         if len(self._bullets) >= 10:
 200             return
 201         bullet.game_pos = pos
 202         self._bullets.add(bullet)
 203
 204     @defer_to_update
 205     def _fire_weapon(self, world):
 206         weapon = weapon_by_name(world.weapons.current)
 207         weapon.play_sound()
 208         if weapon.bullet_range > 0:
 209             self._fire_bullet(
 210                 weapon.assemble_bullet(), self._player_pos, self._angle_dp)
 211         else:
 212             # melee
 213             pos, dp = self._player_pos, self._angle_dp
 214             pos = (pos[0] + dp[0], pos[1] + dp[1])
 215             enemy = self._level.get_enemy(pos[0], pos[1])
 216             if enemy:
 217                 self._hit_enemy(enemy, weapon)
 218
 219     @defer_to_update
 220     def _change_vehicle(self, world):
 221         vehicle = Vehicle.random()
 222         world.vehicles.current = vehicle
 223         self._vehicle_changed()
 224
 225     def update(self, world, engine, dt):
 226         super().update(world, engine, dt)
 227         events = world.pop_events()
 228         for friend in self._friends:
 229             friend.pos = self.calc_offset(
 230                 friend.game_pos[0] * TILE_SIZE, friend.game_pos[1] * TILE_SIZE)
 231         for item in self._items:
 232             item.pos = self.calc_offset(
 233                 item.game_pos[0] * TILE_SIZE, item.game_pos[1] * TILE_SIZE)
 234         self._check_enemies()
 235         for enemy in self._enemies:
 236             enemy.pos = self.calc_offset(
 237                 enemy.game_pos[0] * TILE_SIZE, enemy.game_pos[1] * TILE_SIZE)
 238         for bullet in self._bullets:
 239             bullet.pos = self.calc_offset(
 240                 bullet.game_pos[0] * TILE_SIZE + (TILE_SIZE // 2),
 241                 bullet.game_pos[0] * TILE_SIZE + (TILE_SIZE // 2))
 242         more = self._check_held_keys(dt)
 243         if more:
 244             events.extend(more)
 245         return events
 246
 247     def _check_enemies(self):
 248         if len(self._level.enemies) != len(self._enemies):
 249             # New nemy has spawned
 250             for enemy in self._level.enemies:
 251                 if enemy not in self._enemies:
 252                     self._enemies.add(enemy)
 253
 254     def _check_held_keys(self, dt):
 255         for key in self._held_keys:
 256             self._last_key_down += dt
 257             if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 258                 return self._movement_key(key, dt)
 259             elif key == keys.X:
 260                 return self._fire_key(dt)
 261
 262     def _movement_key(self, key, dt):
 263         x, y = self._player_pos
 264         for k, dp, angle in (
 265             (keys.DOWN, (0, 1), 180),
 266             (keys.UP, (0, -1), 0),
 267             (keys.LEFT, (-1, 0), 90),
 268             (keys.RIGHT, (1, 0), -90),
 269         ):
 270             if key == k:
 271                 if (self._angle == angle and
 272                         self._last_key_down > self._key_rate):
 273                     nx, ny = x + dp[0], y + dp[1]
 274                     if self._can_move(nx, ny):
 275                         self._set_pos(nx, ny)
 276                         offset = (TILE_SIZE * dp[0], TILE_SIZE * dp[1])
 277                         self._set_angle(angle, dp)
 278                         self._last_key_down = 0
 279                         return [MoveViewportEvent(offset)]
 280                 else:
 281                     # just turn
 282                     self._set_angle(angle, dp)
 283
 284     def _activate_key(self):
 285         x, y = self._player_pos
 286         if self._level.is_grate(x, y):
 287             if (self._level_layer == 'floor' and
 288                     self._level.can_crawl(x, y, 'floor')):
 289                 if self._level.can_crawl(x, y, 'tunnels'):
 290                     self._level_layer = 'tunnels'
 291                     self._mode = 'crawl'
 292             elif self._level.can_crawl(x, y, 'floor'):
 293                 # Must be in the tunnels already
 294                 self._level_layer = 'floor'
 295                 self._mode = 'walk'
 296         elif self._level.is_keypad(x, y):
 297             self._level.press_keypad(x, y, self._roaches)
 298         elif self._level.friend_at(x, y):
 299             friend = self._level.friend_at(x, y)
 300             self._level.remove_friend(friend)
 301             self._friends.remove(friend)
 302             self._add_roach()
 303         elif self._level.item_at(x, y):
 304             item = self._level.item_at(x, y)
 305             self._level.remove_item(item)
 306             self._items.remove(item)
 307             self._gain_item(item)
 308         elif self._level.is_exit(x, y):
 309             next_level = self._level.get_exit_level()
 310             return [
 311                 WorldEvent('set', {'level.name': next_level}),
 312                 ChangeSceneEvent(GameLevelScene())]
 313
 314     def _fire_key(self, dt):
 315         if self._last_key_down > self._key_rate:
 316             self._last_key_down = 0
 317             self._fire_weapon()
 318
 319     def _vehicle_management_key(self):
 320         from .roach_management import RoachesScene
 321         return [ChangeSceneEvent(RoachesScene(level_scene=self))]
 322
 323     def on_key_down(self, key, mod, unicode):
 324         x, y = self._player_pos
 325         if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 326             self._held_keys.clear()
 327             self._held_keys.add(key)
 328             # We do this so pressing the key has an instant effect, and can
 329             # then be held
 330             self._last_key_down = self._key_rate + 0.01
 331             return self._movement_key(key, 0.01)
 332         elif key == keys.C:
 333             return self._activate_key()
 334         elif key == keys.X:
 335             self._held_keys.clear()
 336             self._held_keys.add(key)
 337             self._last_key_down = self._key_rate + 0.01
 338             return self._fire_key(0.01)
 339         elif key == keys.V:
 340             return self._change_vehicle()
 341         elif key == keys.Z:
 342             return self._vehicle_management_key()
 343         return super(GameLevelScene, self).on_key_down(key, mod, unicode)
 344
 345     def on_key_up(self, key, mode):
 346         self._held_keys.discard(key)
 347         self._last_key_down = 0