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 Scene, ChangeSceneEvent, MoveViewportEvent, defer_to_update
   8 from ..constants import TILE_SIZE, WIDTH, HEIGHT
   9 from ..roaches import build_roach
  10 from ..vehicles.base import Vehicle
  11
  12
  13 class BaseLevelScene(Scene):
  14     """ Level scene. """
  15
  16     def __init__(self):
  17         super().__init__()
  18         self._level = None
  19
  20     def enter(self, world):
  21         self._level = levels.load(world.level.name)
  22         self._tiles = self._level.tiles
  23         self._level_layer = 'floor'
  24         self._surfaces = {}
  25         self._overlay = {}
  26         for layer in ['floor', 'tunnels']:
  27             self._surfaces[layer] = self._render(layer)
  28         self._overlay = self._surfaces['floor'].copy()
  29         self._doors = self.actors.add_layer("doors", level=9)
  30         self._keypads = self.actors.add_layer("keypads", level=8)
  31         # These are already Actors
  32         for door in self._level.doors:
  33             self._doors.add(door)
  34         for keypad in self._level.keypads:
  35             self._keypads.add(keypad)
  36
  37     def _render(self, layer):
  38         # We cache the rendered surface to avoid doing a large number
  39         # of blits each frame, as that introduces a large performance
  40         # overhead.
  41         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  42                            len(self._tiles) * TILE_SIZE))
  43         layer_key = '%s image' % layer
  44         for y, row in enumerate(self._tiles):
  45             for x, tile in enumerate(row):
  46                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  47                 if layer_key not in tile:
  48                     # Skip broken tiles for now
  49                     continue
  50                 surface.blit(tile[layer_key], pos)
  51         return surface.convert_alpha()
  52
  53     def update(self, world, engine, dt):
  54         """Fix the door and keypad positions"""
  55         super().update(world, engine, dt)
  56         for door in self._doors:
  57             door.pos = self.calc_offset(
  58                 door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  59         for keypad in self._keypads:
  60             keypad.pos = self.calc_offset(
  61                 keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  62
  63     def draw(self, screen):
  64         screen.clear()
  65         # Viewport is the position of the screen relative to the
  66         # surface. We need the position of the surface relative to
  67         # the screen for the blit, so this conversion
  68         viewport = self.viewport
  69         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  70                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  71         if self._level_layer != 'floor':
  72             screen.surface.blit(
  73                 self._overlay, (0, 0),
  74                 area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  75                 special_flags=pgl.BLEND_MULT)
  76         self.actors.draw(screen)
  77
  78     def on_key_down(self, key, mod, unicode):
  79         if key == keys.ESCAPE:
  80             from .menu import MenuScene
  81             return [ChangeSceneEvent(MenuScene())]
  82
  83
  84 class GameLevelScene(BaseLevelScene):
  85
  86     def enter(self, world):
  87         if self._level is not None:
  88             return
  89         super().enter(world)
  90         self._roaches = self.actors.add_layer("roaches", level=10)
  91         self._friends = self.actors.add_layer("friendly roaches", level=9)
  92         self._vehicle = Vehicle.current(world)
  93         self._mode = 'walk'
  94         self._angle = 0
  95         return self._init_roaches(world)
  96
  97     def _init_roaches(self, world):
  98         x, y = self._level.start_pos
  99         self._level_layer = 'floor'
 100         self._avatar = self._vehicle.get_avatar(world)
 101         self._set_pos(x, y)
 102         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 103         self._roaches.add(self._avatar)
 104         for friend in self._level.friends:
 105             self._friends.add(friend)
 106         # Fix viewport offset
 107         return [
 108             MoveViewportEvent((
 109                 x * TILE_SIZE - WIDTH // 2,
 110                 y * TILE_SIZE - HEIGHT // 2))]
 111
 112     def _set_pos(self, x, y):
 113         self._player_pos = (x, y)
 114         # print('At ', (x, y))
 115
 116     def _can_move(self, x, y):
 117         if self._mode == 'walk':
 118             return self._level.can_walk(x, y, self._level_layer)
 119         elif self._mode == 'fly':
 120             return self._level.can_fly(x, y, self._level_layer)
 121         elif self._mode == 'crawl':
 122             return self._level.can_crawl(x, y, self._level_layer)
 123
 124     def _set_angle(self, angle):
 125         self._angle = angle
 126         self._avatar.angle = angle
 127
 128     @defer_to_update
 129     def _vehicle_changed(self, world):
 130         self._roaches.remove(self._avatar)
 131         self._vehicle = Vehicle.current(world)
 132         self._avatar = self._vehicle.get_avatar(world)
 133         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 134         self._roaches.add(self._avatar)
 135         self._set_angle(self._angle)
 136
 137     @defer_to_update
 138     def _add_roach(self, world):
 139         world.roaches.append(build_roach(world))
 140         self._vehicle_changed()
 141
 142     @defer_to_update
 143     def _change_vehicle(self, world):
 144         vehicle = Vehicle.random()
 145         world.vehicles.current = vehicle
 146         self._vehicle_changed()
 147
 148     def update(self, world, engine, dt):
 149         super().update(world, engine, dt)
 150         events = world.pop_events()
 151         for friend in self._friends:
 152             friend.pos = self.calc_offset(
 153                 friend.game_pos[0] * TILE_SIZE, friend.game_pos[1] * TILE_SIZE)
 154         return events
 155
 156     def _movement_key(self, key):
 157         x, y = self._player_pos
 158         for k, dp, angle in (
 159             (keys.DOWN, (0, 1), 180),
 160             (keys.UP, (0, -1), 0),
 161             (keys.LEFT, (-1, 0), 90),
 162             (keys.RIGHT, (1, 0), -90),
 163         ):
 164             if key == k:
 165                 nx, ny = x + dp[0], y + dp[1]
 166                 if self._can_move(nx, ny):
 167                     self._set_pos(nx, ny)
 168                     offset = (TILE_SIZE * dp[0], TILE_SIZE * dp[1])
 169                     self._set_angle(angle)
 170                     return [MoveViewportEvent(offset)]
 171
 172     def _activate_key(self):
 173         x, y = self._player_pos
 174         if self._level.is_grate(x, y):
 175             if (self._level_layer == 'floor' and
 176                     self._level.can_crawl(x, y, 'floor')):
 177                 if self._level.can_crawl(x, y, 'tunnels'):
 178                     self._level_layer = 'tunnels'
 179                     self._mode = 'crawl'
 180             elif self._level.can_crawl(x, y, 'floor'):
 181                 # Must be in the tunnels already
 182                 self._level_layer = 'floor'
 183                 self._mode = 'walk'
 184         elif self._level.is_keypad(x, y):
 185             self._level.press_keypad(x, y, self._roaches)
 186         elif self._level.is_on_friend(x, y):
 187             friend = self._level.remove_friend(x, y)
 188             self._friends.remove(friend)
 189             self._add_roach()
 190
 191     def _fire_key(self):
 192         print('Boom')
 193
 194     def _vehicle_management_key(self):
 195         from .roach_management import RoachesScene
 196         return [ChangeSceneEvent(RoachesScene(level_scene=self))]
 197
 198     def on_key_down(self, key, mod, unicode):
 199         x, y = self._player_pos
 200         if key in (keys.DOWN, keys.UP, keys.LEFT, keys.RIGHT):
 201             return self._movement_key(key)
 202         elif key == keys.C:
 203             return self._activate_key()
 204         elif key == keys.X:
 205             return self._fire_key()
 206         elif key == keys.V:
 207             return self._change_vehicle()
 208         elif key == keys.Z:
 209             return self._vehicle_management_key()
 210         return super(GameLevelScene, self).on_key_down(key, mod, unicode)