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