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 ..roaches import default_roaches
  10
  11
  12 class BaseLevelScene(Scene):
  13     """ Level scene. """
  14
  15     def enter(self, world):
  16         self._level = levels.load(world.level.name)
  17         self._tiles = self._level.tiles
  18         self._level_layer = 'floor'
  19         self._surfaces = {}
  20         self._overlay = {}
  21         for layer in ['floor', 'tunnels']:
  22             self._surfaces[layer] = self._render(layer)
  23         self._overlay = self._surfaces['floor'].copy()
  24         self._doors = self.actors.add_layer("doors", level=15)
  25         self._keypads = self.actors.add_layer("keypads", level=16)
  26         # These are already Actors
  27         for door in self._level.doors:
  28             self._doors.append(door)
  29         for keypad in self._level.keypads:
  30             self._keypads.append(keypads)
  31
  32     def _render(self, layer):
  33         # We cache the rendered surface to avoid doing a large number
  34         # of blits each frame, as that introduces a large performance
  35         # overhead.
  36         surface = Surface((len(self._tiles[0]) * TILE_SIZE,
  37                            len(self._tiles) * TILE_SIZE))
  38         layer_key = '%s image' % layer
  39         for y, row in enumerate(self._tiles):
  40             for x, tile in enumerate(row):
  41                 pos = (x * TILE_SIZE, y * TILE_SIZE)
  42                 if layer_key not in tile:
  43                     # Skip broken tiles for now
  44                     continue
  45                 surface.blit(tile[layer_key], pos)
  46         return surface.convert_alpha()
  47
  48     def draw(self, screen, viewport):
  49         screen.clear()
  50         # Viewport is the position of the screen relative to the
  51         # surface. We need the position of the surface relative to
  52         # the screen for the blit, so this conversion
  53         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  54                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  55         if self._level_layer != 'floor':
  56             screen.surface.blit(self._overlay, (0, 0),
  57                          area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  58                          special_flags=pgl.BLEND_MULT)
  59         self.actors.draw(screen)
  60
  61     def on_key_down(self, key, mod, unicode):
  62         if key == keys.ESCAPE:
  63             from .menu import MenuScene
  64             return [ChangeSceneEvent(MenuScene())]
  65
  66
  67 class GameLevelScene(BaseLevelScene):
  68
  69     def enter(self, world):
  70         super().enter(world)
  71         self._roaches = self.actors.add_layer("roaches", level=10)
  72         self._mode = 'walk'
  73         return self._init_roaches(world.roaches)
  74
  75     def _init_roaches(self, roaches):
  76         for roach in roaches:
  77             roach_actor = self._roaches.add(default_roaches.assemble(roach))
  78             roach_actor.anchor = (0, 0)
  79             roach_actor.pos = (WIDTH // 2, HEIGHT // 2)
  80         x, y = self._level.start_pos
  81         self._set_pos(x, y)
  82         self._level_layer = 'floor'
  83         # Fix viewport offset
  84         return [MoveViewportEvent((x * TILE_SIZE - WIDTH // 2, y * TILE_SIZE - HEIGHT // 2))]
  85
  86     def _set_pos(self, x, y):
  87         self._player_pos = (x, y)
  88         print('Now at ', x, y)
  89
  90     def _can_move(self, x, y):
  91         if self._mode == 'walk':
  92             return self._level.can_walk(x, y, self._level_layer)
  93         elif self._mode == 'fly':
  94             return self._level.can_fly(x, y, self._level_layer)
  95         elif self._mode == 'crawl':
  96             return self._level.can_crawl(x, y, self._level_layer)
  97
  98     def _set_angle(self, angle):
  99         for roach in self._roaches:
 100             roach.angle = angle
 101
 102     def on_key_down(self, key, mod, unicode):
 103         offset = None
 104         x, y = self._player_pos
 105         if key == keys.DOWN:
 106             if self._can_move(x, y + 1):
 107                 self._set_pos(x, y + 1)
 108                 offset = (0, TILE_SIZE)
 109                 self._set_angle(180)
 110         elif key == keys.UP:
 111             if self._can_move(x, y - 1):
 112                 self._set_pos(x, y - 1)
 113                 offset = (0, -TILE_SIZE)
 114                 self._set_angle(0)
 115         elif key == keys.LEFT:
 116             if self._can_move(x - 1, y):
 117                 self._set_pos(x - 1, y)
 118                 offset = (-TILE_SIZE, 0)
 119                 self._set_angle(90)
 120         elif key == keys.RIGHT:
 121             if self._can_move(x + 1, y):
 122                 self._set_pos(x + 1, y)
 123                 offset = (TILE_SIZE, 0)
 124                 self._set_angle(270)
 125         elif key == keys.S:
 126             if self._level_layer == 'floor' and self._level.can_crawl(x, y, 'floor'):
 127                 # We're probably on a grate
 128                 if self._level.can_crawl(x, y, 'tunnels'):
 129                     self._level_layer = 'tunnels'
 130                     self._mode = 'crawl'
 131             elif self._level.can_crawl(x, y, 'floor'):
 132                 # Must be in the tunnels already
 133                 self._level_layer = 'floor'
 134                 self._mode = 'walk'
 135             return
 136         if offset:
 137             return [MoveViewportEvent(offset)]
 138         return super(GameLevelScene, self).on_key_down(key, mod, unicode)
 139
 140