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 from .constants import (SCREEN_SIZE, MOULD_CATEGORY, OBSTACLE_CATEGORY,
  12                         TURNIP_CATEGORY, COLOURS)
  13 from .loader import loader
  14 from .sound import sound
  15 from .transforms import Multiply
  16 from .utils import debug_timer
  17
  18 MOULD_FILTER = pymunk.ShapeFilter(
  19     mask=MOULD_CATEGORY | OBSTACLE_CATEGORY,
  20     categories=MOULD_CATEGORY)
  21
  22 EAT_TURNIP_FILTER = pymunk.ShapeFilter(mask=TURNIP_CATEGORY)
  23
  24
  25 # Boyd parameters
  26 SPAWN_RATE = 5
  27 MAX_AGE = 30
  28 MAX_ELEMENTS = 400
  29 MAX_HEALTH = 100
  30
  31 # Increase in health per day
  32 DAY_HEALTH = 10
  33
  34 HEAL_FACTOR = 1
  35
  36 MOULD_STAGES = [7, 13]
  37
  38 MOULD_RADIUS = 16
  39
  40
  41 def calc_colour_transform(resistances):
  42     fr = fg = fb = 0
  43     for colour, value in resistances.items():
  44         if value:
  45             new_value = 63 + 64 * value
  46             r, g, b = COLOURS[colour]
  47             if r:
  48                 fr += new_value
  49             if g:
  50                 fg += new_value
  51             if b:
  52                 fb += new_value
  53     # Scale if we've exceeded 255
  54     # Should only be required when we have lights that aren't soley red,
  55     # green or blue
  56     max_value = max(fr, fg, fb)
  57     if max_value > 255:
  58         fr = int(255 * fr / float(max_value))
  59         fg = int(255 * fg / float(max_value))
  60         fb = int(255 * fb / float(max_value))
  61     return Multiply(colour=(fr, fg, fb))
  62
  63
  64 class Mould(pymunk.Body):
  65     """A segment of Boyd"""
  66
  67     def __init__(self, gamestate, space, pos, resistances, transform):
  68         super(Mould, self).__init__(0, 0, pymunk.Body.STATIC)
  69         self.position = pos
  70         self._shape = pymunk.Circle(self, MOULD_RADIUS)
  71         space.add(self, self._shape)
  72         self._shape.filter = MOULD_FILTER
  73         self._age = 0
  74         self._img = None
  75         self._health = 500
  76         self.has_eyeball = False
  77         self._eyeball = None
  78         self._resistances = resistances
  79         self._transform = transform
  80
  81     def pygame_pos(self, surface):
  82         """Convert to pygame coordinates and offset position so
  83            our position is the centre of the image."""
  84         # The odd sign combination is because of the pymunk / pygame
  85         # transform, but we do it this way to exploit Vec2d math magic
  86         return pymunk.pygame_util.to_pygame(
  87             self.position + (-MOULD_RADIUS, MOULD_RADIUS), surface)
  88
  89     def get_image(self):
  90         if not self._img:
  91             name = random.choice(
  92                 ('mouldA.png', 'mouldB.png', 'mouldC.png'))
  93             size = (
  94                 "16" if self._age < MOULD_STAGES[0] else
  95                 "32" if self._age < MOULD_STAGES[1] else "64")
  96             self._img = loader.load_image(size, name,
  97                                           transform=self._transform)
  98         return self._img
  99
 100     def get_eyeball(self):
 101         if not self._eyeball:
 102             name = random.choice(
 103                 ('eyeballA.png', 'eyeballB.png', 'eyeballC.png'))
 104             self._eyeball = loader.load_image("32", name)
 105             eyelid = loader.load_image("32", "eyelid.png", transform=self._transform)
 106             self._eyeball.blit(eyelid, (0, 0), None)
 107         return self._eyeball
 108
 109     def set_health(self, new_health):
 110         self._health = new_health
 111
 112     def tick(self, gamestate, space, moulds):
 113         """Grow and / or Die"""
 114
 115         self._age += 1
 116
 117         # we regain a health every tick, so we heal in the dark
 118         if self._health < MAX_HEALTH:
 119             self._health += HEAL_FACTOR
 120
 121         refresh = False
 122
 123         if (self._age % SPAWN_RATE) == 0 and len(moulds) < MAX_ELEMENTS:
 124             # Spawn a new child, if we can
 125             spawn = True
 126             choice = random.randint(0, 3)
 127             if choice == 0:
 128                 pos = self.position + (0, 24)
 129             elif choice == 1:
 130                 pos = self.position + (24, 0)
 131             elif choice == 2:
 132                 pos = self.position + (-24, 0)
 133             else:
 134                 pos = self.position + (0, -24)
 135             # check for bounds
 136             if pos[0] < 0 or pos[0] >= SCREEN_SIZE[0]:
 137                 spawn = False
 138             if pos[1] < 0 or pos[1] >= SCREEN_SIZE[1]:
 139                 spawn = False
 140             # Check for free space
 141             # We allow some overlap, hence not checking full radius
 142             query = space.point_query(pos, 8, MOULD_FILTER)
 143             if query:
 144                 spawn = False
 145             if spawn:
 146                 child = Mould(gamestate, space, pos, self._resistances,
 147                               self._transform)
 148                 child._health = self._health
 149                 moulds.append(child)
 150                 refresh = True
 151
 152         if self._age in MOULD_STAGES:
 153             # We grow in size
 154             refresh = True
 155             self._img = None  # invalidate cached image
 156
 157         if self._age > MOULD_STAGES[1] and random.randint(0, 500) < 1:
 158             # Maybe we grow an eyeball
 159             self.has_eyeball = True
 160             sound.play_sound("mouth_pop_2a.ogg")
 161
 162         if self._age > MAX_AGE:
 163             # We die of old age
 164             space.remove(self, self._shape)
 165             moulds.remove(self)
 166             refresh = True
 167         else:
 168             # Check for turnips we can eat
 169             # Note that we can only eat a tick after we spawn
 170             query = space.point_query(self.position, MOULD_RADIUS,
 171                                       EAT_TURNIP_FILTER)
 172             if query:
 173                 query[0].shape.body.turnip.eaten = True
 174         return refresh
 175
 176     def damage(self, light, space, moulds):
 177         """Take damage for light, adjusted for resistances."""
 178         damage = light.base_damage()
 179         colour = light.colour
 180         damage = int(damage * (3 - self._resistances.get(colour, 0)) / 3.0)
 181         self._health -= damage
 182         if self._health <= 0 and self._age <= MAX_AGE:
 183             # We die of damage
 184             space.remove(self, self._shape)
 185             moulds.remove(self)
 186             return True
 187         return False
 188
 189
 190 class Boyd(object):
 191
 192     def __init__(self, gamestate, space):
 193         self._moulds = []
 194         self._seen_colours = set()
 195         self._mould_transform = calc_colour_transform(gamestate.resistances)
 196         for position in gamestate.get_spawn_positions():
 197             seed = Mould(gamestate, space, position,
 198                          gamestate.resistances, self._mould_transform)
 199             seed.set_health(MAX_HEALTH + gamestate.days * DAY_HEALTH)
 200             self._moulds.append(seed)
 201         self._image = pygame.surface.Surface(SCREEN_SIZE)
 202         self._image = self._image.convert_alpha(pygame.display.get_surface())
 203         self._draw_moulds()
 204
 205     def _draw_moulds(self):
 206         self._image.fill((0, 0, 0, 0))
 207         for m in self._moulds:
 208             self._image.blit(m.get_image(),
 209                              m.pygame_pos(self._image), None,
 210                              0)
 211         for m in self._moulds:
 212             if m.has_eyeball:
 213                 self._image.blit(m.get_eyeball(), m.pygame_pos(self._image),
 214                                  None, 0)
 215
 216     @debug_timer('Boyd.tick')
 217     def tick(self, gamestate, space, lights):
 218         redraw = False
 219         # Handle spawn events
 220         for mould in self._moulds[:]:
 221             # Handle updates
 222             if mould.tick(gamestate, space, self._moulds):
 223                 redraw = True
 224             # Check for damage
 225             lit_by = lights.lit_by(mould.position, MOULD_RADIUS)
 226             for light in lit_by:
 227                 self._seen_colours.add(light.colour)
 228                 if mould.damage(light, space, self._moulds):
 229                     redraw = True
 230                     break  # we only die once
 231         if redraw:
 232             self._draw_moulds()
 233
 234     def render(self, surface):
 235         """Draw ourselves"""
 236         surface.blit(self._image, (0, 0), None, 0)
 237
 238     def alive(self):
 239         return len(self._moulds) > 0
 240
 241     def update_resistances(self, gamestate):
 242         for colour in self._seen_colours:
 243             cur_reistance = gamestate.resistances.get(colour, 0)
 244             gamestate.resistances[colour] = cur_reistance + 2
 245         for colour in gamestate.resistances:
 246             gamestate.resistances[colour] -= 1
 247             if gamestate.resistances[colour] > 3:
 248                 gamestate.resistances[colour] = 3
 249             if gamestate.resistances[colour] < 0:
 250                 gamestate.resistances[colour] = 0