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
   8 from ..constants import TILE_SIZE, WIDTH, HEIGHT
   9 from ..vehicles.base import Vehicle
  10
  11
  12 class BaseLevelScene(Scene):
  13     """ Level scene. """
  14
  15     def __init__(self):
  16         super().__init__()
  17         self._level = None
  18
  19     def enter(self, world):
  20         self._level = levels.load(world.level.name)
  21         self._tiles = self._level.tiles
  22         self._level_layer = 'floor'
  23         self._surfaces = {}
  24         self._overlay = {}
  25         for layer in ['floor', 'tunnels']:
  26             self._surfaces[layer] = self._render(layer)
  27         self._overlay = self._surfaces['floor'].copy()
  28         self._doors = self.actors.add_layer("doors", level=9)
  29         self._keypads = self.actors.add_layer("keypads", level=8)
  30         # These are already Actors
  31         for door in self._level.doors:
  32             self._doors.add(door)
  33         for keypad in self._level.keypads:
  34             self._keypads.add(keypad)
  35
  36     def _render(self, layer):
  37         # We cache the rendered surface to avoid doing a large number
  38         # of blits each frame, as that introduces a large performance
  39         # overhead.
  40         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  41                            len(self._tiles) * TILE_SIZE))
  42         layer_key = '%s image' % layer
  43         for y, row in enumerate(self._tiles):
  44             for x, tile in enumerate(row):
  45                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  46                 if layer_key not in tile:
  47                     # Skip broken tiles for now
  48                     continue
  49                 surface.blit(tile[layer_key], pos)
  50         return surface.convert_alpha()
  51
  52     def update(self, world, engine, dt):
  53         """Fix the door and keypad positions"""
  54         for door in self._doors:
  55             door.pos = engine.calc_offset(
  56                 door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  57         for keypad in self._keypads:
  58             keypad.pos = engine.calc_offset(
  59                 keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  60
  61     def draw(self, screen, viewport):
  62         screen.clear()
  63         # Viewport is the position of the screen relative to the
  64         # surface. We need the position of the surface relative to
  65         # the screen for the blit, so this conversion
  66         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  67                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  68         if self._level_layer != 'floor':
  69             screen.surface.blit(
  70                 self._overlay, (0, 0),
  71                 area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  72                 special_flags=pgl.BLEND_MULT)
  73         self.actors.draw(screen)
  74
  75     def on_key_down(self, key, mod, unicode):
  76         if key == keys.ESCAPE:
  77             from .menu import MenuScene
  78             return [ChangeSceneEvent(MenuScene())]
  79
  80
  81 class GameLevelScene(BaseLevelScene):
  82
  83     def enter(self, world):
  84         if self._level is not None:
  85             return
  86         super().enter(world)
  87         self._roaches = self.actors.add_layer("roaches", level=10)
  88         self._vehicle = Vehicle.current(world)
  89         self._mode = 'walk'
  90         self._angle = 0
  91         return self._init_roaches(world)
  92
  93     def _init_roaches(self, world):
  94         x, y = self._level.start_pos
  95         self._level_layer = 'floor'
  96         self._avatar = self._vehicle.get_avatar(world)
  97         self._set_pos(x, y)
  98         self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
  99         self._roaches.add(self._avatar)
 100         # Fix viewport offset
 101         return [
 102             MoveViewportEvent((
 103                 x * TILE_SIZE - WIDTH // 2,
 104                 y * TILE_SIZE - HEIGHT // 2))]
 105
 106     def _set_pos(self, x, y):
 107         self._player_pos = (x, y)
 108
 109     def _can_move(self, x, y):
 110         if self._mode == 'walk':
 111             return self._level.can_walk(x, y, self._level_layer)
 112         elif self._mode == 'fly':
 113             return self._level.can_fly(x, y, self._level_layer)
 114         elif self._mode == 'crawl':
 115             return self._level.can_crawl(x, y, self._level_layer)
 116
 117     def _set_angle(self, angle):
 118         self._angle = angle
 119         self._avatar.angle = angle
 120
 121     def update(self, world, engine, dt):
 122         if self._vehicle.changed():
 123             self._roaches.remove(self._avatar)
 124             self._avatar = self._vehicle.get_avatar(world)
 125             self._avatar.pos = (WIDTH // 2, HEIGHT // 2)
 126             self._roaches.add(self._avatar)
 127             self._avatar.set_angle(self._angle)
 128         super().update(world, engine, dt)
 129
 130     def on_key_down(self, key, mod, unicode):
 131         offset = None
 132         x, y = self._player_pos
 133         if key == keys.DOWN:
 134             if self._can_move(x, y + 1):
 135                 self._set_pos(x, y + 1)
 136                 offset = (0, TILE_SIZE)
 137                 self._set_angle(180)
 138         elif key == keys.UP:
 139             if self._can_move(x, y - 1):
 140                 self._set_pos(x, y - 1)
 141                 offset = (0, -TILE_SIZE)
 142                 self._set_angle(0)
 143         elif key == keys.LEFT:
 144             if self._can_move(x - 1, y):
 145                 self._set_pos(x - 1, y)
 146                 offset = (-TILE_SIZE, 0)
 147                 self._set_angle(90)
 148         elif key == keys.RIGHT:
 149             if self._can_move(x + 1, y):
 150                 self._set_pos(x + 1, y)
 151                 offset = (TILE_SIZE, 0)
 152                 self._set_angle(270)
 153         elif key == keys.C:
 154             # Activate
 155             if self._level.is_grate(x, y):
 156                 if self._level_layer == 'floor' and self._level.can_crawl(x, y, 'floor'):
 157                     if self._level.can_crawl(x, y, 'tunnels'):
 158                         self._level_layer = 'tunnels'
 159                         self._mode = 'crawl'
 160                 elif self._level.can_crawl(x, y, 'floor'):
 161                     # Must be in the tunnels already
 162                     self._level_layer = 'floor'
 163                     self._mode = 'walk'
 164             elif self._level.is_keypad(x, y):
 165                 self._level.press_keypad(x, y, self._roaches)
 166             return
 167         elif key == keys.X:
 168             # Fire
 169             print('Boom')
 170         elif key == keys.V:
 171             # Leave vehicle
 172             print('Vehicle key pressed')
 173         elif key == keys.Z:
 174             # Vehicle management
 175             from .roach_management import RoachesScene
 176             return[ChangeSceneEvent(RoachesScene(level_scene=self))]
 177         if offset:
 178             return [MoveViewportEvent(offset)]
 179         return super(GameLevelScene, self).on_key_down(key, mod, unicode)