tabakrolletjie/enemies.py

   1 # Boyd, the friendly, misunderstood turnip loving, light hating space mould
   2
   3 import random
   4
   5 import pymunk
   6 import pymunk.pygame_util
   7 import pygame.draw
   8 import pygame.surface
   9 import pygame.display
  10
  11 import pygame.locals as pgl
  12
  13 from .constants import SCREEN_SIZE, MOULD_CATEGORY, OBSTACLE_CATEGORY
  14 from .loader import loader
  15
  16 MOULD_FILTER = pymunk.ShapeFilter(
  17     mask=MOULD_CATEGORY | OBSTACLE_CATEGORY,
  18     categories=MOULD_CATEGORY)
  19
  20
  21 class Mould(pymunk.Body):
  22     """A segment of Boyd"""
  23
  24     def __init__(self, gamestate, space, pos):
  25         super(Mould, self).__init__(0, 0, pymunk.Body.STATIC)
  26         self.position = pos
  27         self._shape = pymunk.Circle(self, 16)
  28         space.add(self, self._shape)
  29         self._shape.filter = MOULD_FILTER
  30         self._resistances = {}
  31         self._age = 0
  32         self._img = None
  33
  34     def pygame_pos(self, surface):
  35         """Convert to pygame coordinates and offset position so
  36            our position is the centre of the image."""
  37         # The odd sign combination is because of the pymunk / pygame
  38         # transform, but we do it this way to exploit Vec2d math magic
  39         return pymunk.pygame_util.to_pygame(self.position + (-16, 16), surface)
  40
  41     def get_image(self):
  42         if not self._img:
  43             name = random.choice(
  44                 ('mouldA.png', 'mouldB.png', 'mouldC.png'))
  45             self._img = loader.load_image("32", name)
  46         return self._img
  47
  48     def tick(self, gamestate, space, moulds):
  49         """Grow and / or Die"""
  50         self._age += 1
  51
  52         refresh = False
  53
  54         if (self._age % 15) == 0 and len(moulds) < 1000:
  55             # Spawn a new child, if we can
  56             spawn = True
  57             choice = random.randint(0, 4)
  58             if choice == 0:
  59                 pos = self.position + (0, 24)
  60             elif choice == 1:
  61                 pos = self.position + (24, 0)
  62             elif choice == 2:
  63                 pos = self.position + (-24, 0)
  64             else:
  65                 pos = self.position + (0, -24)
  66             # check for bounds
  67             if pos[0] < 0 or pos[0] >= SCREEN_SIZE[0]:
  68                 spawn = False
  69             if pos[1] < 0 or pos[1] >= SCREEN_SIZE[1]:
  70                 spawn = False
  71             # Check for free space
  72             # We allow some overlap, hence not checking full radius
  73             query = space.point_query(pos, 8, MOULD_FILTER)
  74             if query:
  75                 # for x in query:
  76                 #     if not isinstance(x.shape.body, Mould):
  77                 #         print x.shape, x.shape.body
  78                 spawn = False
  79             if spawn:
  80                 child = Mould(gamestate, space, pos)
  81                 moulds.append(child)
  82                 refresh = True
  83
  84         if self._age > 120:
  85             # We die of old age
  86             space.remove(self, self._shape)
  87             moulds.remove(self)
  88             refresh = True
  89         return refresh
  90
  91     def damage(self, light_color, intensity):
  92         """Take damage for light, adjusted for resistances."""
  93
  94
  95 class Boyd(object):
  96
  97     def __init__(self, gamestate, space):
  98         seed = Mould(gamestate, space, (350, 350))
  99         self._moulds = [seed]
 100         self._image = pygame.surface.Surface(SCREEN_SIZE)
 101         self._image.convert_alpha(pygame.display.get_surface())
 102         self._image.fill((0, 0, 0, 0))
 103         self._image.blit(seed.get_image(),
 104             seed.pygame_pos(self._image), None, pgl.BLEND_RGBA_ADD)
 105
 106     def tick(self, gamestate, space):
 107         redraw = False
 108         for mould in self._moulds[:]:
 109             if mould.tick(gamestate, space, self._moulds):
 110                 redraw = True
 111         if redraw:
 112             self._image.fill((0, 0, 0, 0))
 113             for mould in self._moulds:
 114                 self._image.blit(mould.get_image(),
 115                     mould.pygame_pos(self._image), None, pgl.BLEND_RGBA_ADD)
 116
 117     def render(self, surface):
 118         """Draw ourselves"""
 119         surface.blit(self._image, (0, 0), None, pgl.BLEND_RGBA_ADD)