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