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         self._health = 500
  34
  35     def pygame_pos(self, surface):
  36         """Convert to pygame coordinates and offset position so
  37            our position is the centre of the image."""
  38         # The odd sign combination is because of the pymunk / pygame
  39         # transform, but we do it this way to exploit Vec2d math magic
  40         return pymunk.pygame_util.to_pygame(self.position + (-16, 16), surface)
  41
  42     def get_image(self):
  43         if not self._img:
  44             name = random.choice(
  45                 ('mouldA.png', 'mouldB.png', 'mouldC.png'))
  46             self._img = loader.load_image("32", name)
  47         return self._img
  48
  49     def tick(self, gamestate, space, moulds):
  50         """Grow and / or Die"""
  51         self._age += 1
  52
  53         # we regain a health every tick, so we heal in the dark
  54         if self._health < 100:
  55             self._health += 1
  56
  57         refresh = False
  58
  59         if (self._age % 15) == 0 and len(moulds) < 1000:
  60             # Spawn a new child, if we can
  61             spawn = True
  62             choice = random.randint(0, 4)
  63             if choice == 0:
  64                 pos = self.position + (0, 24)
  65             elif choice == 1:
  66                 pos = self.position + (24, 0)
  67             elif choice == 2:
  68                 pos = self.position + (-24, 0)
  69             else:
  70                 pos = self.position + (0, -24)
  71             # check for bounds
  72             if pos[0] < 0 or pos[0] >= SCREEN_SIZE[0]:
  73                 spawn = False
  74             if pos[1] < 0 or pos[1] >= SCREEN_SIZE[1]:
  75                 spawn = False
  76             # Check for free space
  77             # We allow some overlap, hence not checking full radius
  78             query = space.point_query(pos, 8, MOULD_FILTER)
  79             if query:
  80                 # for x in query:
  81                 #     if not isinstance(x.shape.body, Mould):
  82                 #         print x.shape, x.shape.body
  83                 spawn = False
  84             if spawn:
  85                 child = Mould(gamestate, space, pos)
  86                 child._health = self._health
  87                 moulds.append(child)
  88                 refresh = True
  89
  90         if self._age > 120:
  91             # We die of old age
  92             space.remove(self, self._shape)
  93             moulds.remove(self)
  94             refresh = True
  95         return refresh
  96
  97     def damage(self, light_color, intensity, space, moulds):
  98         """Take damage for light, adjusted for resistances."""
  99         self._health -= 3
 100         if self._health <= 0 and self._age <= 120:
 101             # We die of damage
 102             space.remove(self, self._shape)
 103             moulds.remove(self)
 104             return True
 105         return False
 106
 107
 108 class Boyd(object):
 109
 110     def __init__(self, gamestate, space):
 111         seed = Mould(gamestate, space, (350, 370))
 112         self._moulds = [seed]
 113         self._image = pygame.surface.Surface(SCREEN_SIZE)
 114         self._image.convert_alpha(pygame.display.get_surface())
 115         self._draw_moulds()
 116
 117     def _draw_moulds(self):
 118         self._image.fill((0, 0, 0, 0))
 119         for m in self._moulds:
 120             self._image.blit(m.get_image(),
 121                              m.pygame_pos(self._image), None,
 122                              pgl.BLEND_RGBA_ADD)
 123
 124     def tick(self, gamestate, space, lights):
 125         redraw = False
 126         # Handle spawn events
 127         for mould in self._moulds[:]:
 128             # Handle updates
 129             if mould.tick(gamestate, space, self._moulds):
 130                 redraw = True
 131             # Check for damage
 132             lit_by = lights.light_query(mould._shape)
 133             for light in lit_by:
 134                 # Todo: extract colour and intensity from light
 135                 if mould.damage(None, None, space, self._moulds):
 136                     redraw = True
 137                     break  # we only die once
 138         if redraw:
 139             self._draw_moulds()
 140
 141     def render(self, surface):
 142         """Draw ourselves"""
 143         surface.blit(self._image, (0, 0), None, pgl.BLEND_RGBA_ADD)