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=9)
  25         self._keypads = self.actors.add_layer("keypads", level=8)
  26         # These are already Actors
  27         for door in self._level.doors:
  28             self._doors.add(door)
  29         for keypad in self._level.keypads:
  30             self._keypads.add(keypad)
  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 update(self, world, engine, dt):
  49         """Fix the door and keypad positions"""
  50         for door in self._doors:
  51             door.pos = engine.calc_offset(door.game_pos[0] * TILE_SIZE, door.game_pos[1] * TILE_SIZE)
  52         for keypad in self._keypads:
  53             keypad.pos = engine.calc_offset(keypad.game_pos[0] * TILE_SIZE, keypad.game_pos[1] * TILE_SIZE)
  54
  55     def draw(self, screen, viewport):
  56         screen.clear()
  57         # Viewport is the position of the screen relative to the
  58         # surface. We need the position of the surface relative to
  59         # the screen for the blit, so this conversion
  60         screen.surface.blit(self._surfaces[self._level_layer], (0, 0),
  61                             area=(viewport[0], viewport[1], WIDTH, HEIGHT))
  62         if self._level_layer != 'floor':
  63             screen.surface.blit(self._overlay, (0, 0),
  64                          area=(viewport[0], viewport[1], WIDTH, HEIGHT),
  65                          special_flags=pgl.BLEND_MULT)
  66         self.actors.draw(screen)
  67
  68     def on_key_down(self, key, mod, unicode):
  69         if key == keys.ESCAPE:
  70             from .menu import MenuScene
  71             return [ChangeSceneEvent(MenuScene())]
  72
  73
  74 class GameLevelScene(BaseLevelScene):
  75
  76     def enter(self, world):
  77         super().enter(world)
  78         self._roaches = self.actors.add_layer("roaches", level=10)
  79         self._mode = 'walk'
  80         return self._init_roaches(world.roaches)
  81
  82     def _init_roaches(self, roaches):
  83         for roach in roaches:
  84             roach_actor = self._roaches.add(default_roaches.assemble(roach))
  85             roach_actor.anchor = (0, 0)
  86             roach_actor.pos = (WIDTH // 2, HEIGHT // 2)
  87         x, y = self._level.start_pos
  88         self._set_pos(x, y)
  89         self._level_layer = 'floor'
  90         # Fix viewport offset
  91         return [MoveViewportEvent((x * TILE_SIZE - WIDTH // 2, y * TILE_SIZE - HEIGHT // 2))]
  92
  93     def _set_pos(self, x, y):
  94         self._player_pos = (x, y)
  95         print('Now at ', x, y)
  96
  97     def _can_move(self, x, y):
  98         if self._mode == 'walk':
  99             return self._level.can_walk(x, y, self._level_layer)
 100         elif self._mode == 'fly':
 101             return self._level.can_fly(x, y, self._level_layer)
 102         elif self._mode == 'crawl':
 103             return self._level.can_crawl(x, y, self._level_layer)
 104
 105     def _set_angle(self, angle):
 106         for roach in self._roaches:
 107             roach.angle = angle
 108
 109     def on_key_down(self, key, mod, unicode):
 110         offset = None
 111         x, y = self._player_pos
 112         if key == keys.DOWN:
 113             if self._can_move(x, y + 1):
 114                 self._set_pos(x, y + 1)
 115                 offset = (0, TILE_SIZE)
 116                 self._set_angle(180)
 117         elif key == keys.UP:
 118             if self._can_move(x, y - 1):
 119                 self._set_pos(x, y - 1)
 120                 offset = (0, -TILE_SIZE)
 121                 self._set_angle(0)
 122         elif key == keys.LEFT:
 123             if self._can_move(x - 1, y):
 124                 self._set_pos(x - 1, y)
 125                 offset = (-TILE_SIZE, 0)
 126                 self._set_angle(90)
 127         elif key == keys.RIGHT:
 128             if self._can_move(x + 1, y):
 129                 self._set_pos(x + 1, y)
 130                 offset = (TILE_SIZE, 0)
 131                 self._set_angle(270)
 132         elif key == keys.C:
 133             # Activate
 134             if self._level.is_grate(x, y):
 135                 if self._level_layer == 'floor' and self._level.can_crawl(x, y, 'floor'):
 136                     if self._level.can_crawl(x, y, 'tunnels'):
 137                         self._level_layer = 'tunnels'
 138                         self._mode = 'crawl'
 139                 elif self._level.can_crawl(x, y, 'floor'):
 140                     # Must be in the tunnels already
 141                     self._level_layer = 'floor'
 142                     self._mode = 'walk'
 143             elif self._level.is_keypad(x, y):
 144                 self._level.press_keypad(x, y, self._roaches)
 145             return
 146         elif key == keys.X:
 147             # Fire
 148             print('Boom')
 149         elif key == keys.V:
 150             # Leave vehicle
 151             print('Vehicle key pressed')
 152
 153         if offset:
 154             return [MoveViewportEvent(offset)]
 155         return super(GameLevelScene, self).on_key_down(key, mod, unicode)
 156
 157