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