tabakrolletjie/lights.py

   1 """ May it be a light for you in dark places, when all other lights go out.
   2 """
   3
   4 import math
   5
   6 import pymunk
   7 import pymunk.pygame_util
   8 import pygame.display
   9 import pygame.draw
  10 import pygame.locals as pgl
  11 import pygame.rect
  12 import pygame.transform
  13
  14 from .constants import (
  15     LIGHT_CATEGORY, FITTINGS_CATEGORY, OBSTACLE_CATEGORY, TURNIP_CATEGORY,
  16     COLOURS)
  17 from .rays import RayPolyManager
  18 from .utils import DetailedTimer
  19 from .loader import loader
  20 from .transforms import ColourWedges
  21
  22 LIGHT_FILTER = pymunk.ShapeFilter(
  23     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  24         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  25     categories=LIGHT_CATEGORY)
  26
  27 FITTINGS_FILTER = pymunk.ShapeFilter(
  28     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  29         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  30     categories=FITTINGS_CATEGORY)
  31
  32 # Just match lights, nothing else
  33 LIT_BY_FILTER = pymunk.ShapeFilter(mask=LIGHT_CATEGORY)
  34 SPACE_FOR_LIGHT_FILTER = pymunk.ShapeFilter(
  35     mask=FITTINGS_CATEGORY | OBSTACLE_CATEGORY | TURNIP_CATEGORY)
  36
  37
  38 def check_space_for_light(space, pos, max_distance):
  39     point_info = space.point_query_nearest(
  40         pos, max_distance, SPACE_FOR_LIGHT_FILTER)
  41     if point_info is not None:
  42         return True
  43     return False
  44
  45
  46 class LightManager(object):
  47     """ Manages a set of lights. """
  48
  49     def __init__(self, space, gamestate):
  50         self._space = space
  51         self._battery_dead = False
  52         self._lights = [
  53             BaseLight.load(cfg) for cfg in gamestate.station["lights"]]
  54         for light in self._lights:
  55             light.add(self._space)
  56
  57     def add_light(self, cfg):
  58         light = BaseLight.load(cfg)
  59         self._lights.append(light)
  60         light.add(self._space)
  61
  62     def remove_light(self, light):
  63         self._lights.remove(light)
  64         light.remove(self._space)
  65
  66     def battery_dead(self):
  67         self._battery_dead = True
  68         for light in self._lights:
  69             light.off()
  70
  71     def serialize_lights(self):
  72         result = []
  73         for light in self._lights:
  74             result.append(light.serialize())
  75         return result
  76
  77     def toggle_nearest(self, *args, **kw):
  78         if self._battery_dead:
  79             return
  80         light = self.nearest(*args, **kw)
  81         if light:
  82             light.toggle()
  83
  84     def nearest(self, pos, surfpos=False, max_distance=1.0):
  85         if surfpos:
  86             surface = pygame.display.get_surface()
  87             pos = pymunk.pygame_util.from_pygame(pos, surface)
  88         point_info = self._space.point_query_nearest(
  89             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  90         if point_info is not None:
  91             return point_info.shape.body.light
  92         return None
  93
  94     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  95         if surfpos:
  96             surface = pygame.display.get_surface()
  97             pos = pymunk.pygame_util.from_pygame(pos, surface)
  98         point_info_list = self._space.point_query(
  99             pos, max_distance, LIT_BY_FILTER)
 100         lights = [p.shape.body.light for p in point_info_list]
 101         return [
 102             light for light in lights
 103             if light.on and light.ray_manager.reaches(pos)
 104         ]
 105
 106     def light_query(self, shape):
 107         """Query the lights by shape"""
 108         old_filter = shape.filter
 109         # We need to restrict matches to only the lights
 110         shape.filter = LIT_BY_FILTER
 111         shape_info_list = self._space.shape_query(shape)
 112         shape.filter = old_filter
 113         lights = [p.shape.body.light for p in shape_info_list]
 114         return [
 115             light for light in lights
 116             if light.on and light.ray_manager.reaches(shape.body.position)
 117         ]
 118
 119     def total_power_usage(self):
 120         return sum(light.power_usage() for light in self._lights)
 121
 122     def render_light(self, surface):
 123         for light in self._lights:
 124             light.render_light(surface)
 125
 126     def render_fittings(self, surface):
 127         for light in self._lights:
 128             light.render_fitting(surface)
 129
 130     def tick(self):
 131         for light in self._lights:
 132             light.tick()
 133
 134
 135 def light_fitting_by_type(light_type):
 136     """ Render a light fitting image for a light type. """
 137     return BaseLight.find_cls(light_type).FITTING_IMG
 138
 139
 140 class BaseLight(object):
 141     """ Common light functionality. """
 142
 143     # defaults
 144     RAY_MANAGER = RayPolyManager
 145     FITTING_IMG = None
 146     FITTING_RADIUS = 24.0
 147
 148     # cached surfaces
 149     _surface_cache = {}
 150
 151     def __init__(
 152             self, colours, position, intensity=1.0, radius_limits=None,
 153             direction=None, spread=None, on=True, start_colour=None,
 154             bounding_radius=None):
 155         self.colour_cycle = colours
 156         self.colour_pos = 0
 157         self.colour = colours[0]
 158         if start_colour and start_colour in colours:
 159             self.colour_pos = colours.index(start_colour)
 160             self.colour = start_colour
 161         self.on = on
 162         if not on and len(colours) > 1:
 163             self.colour_pos = -1
 164         self.intensity = intensity
 165         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 166         self.body.light = self
 167         self.ray_manager = self.RAY_MANAGER(
 168             self.body, position, ray_filter=LIGHT_FILTER,
 169             radius_limits=radius_limits, direction=direction, spread=spread,
 170             bounding_radius=bounding_radius)
 171         self.fitting = pymunk.Circle(
 172             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 173         self.fitting.filter = FITTINGS_FILTER
 174         self._fitting_image = None
 175         self._colour_mult_image = None
 176
 177     def serialize(self):
 178         result = self.ray_manager.serialize()
 179         result.update({
 180             "type": self.__class__.__name__.lower(),
 181             "colours": self.colour_cycle,
 182             "position": self.position,
 183             "intensity": self.intensity,
 184             "on": self.on,
 185             "start_colour": self.colour,
 186         })
 187         return result
 188
 189     @property
 190     def position(self):
 191         return self.ray_manager.position
 192
 193     @classmethod
 194     def load(cls, config):
 195         kw = config.copy()
 196         light_type = kw.pop("type")
 197         light_class = cls.find_cls(light_type)
 198         return light_class(**kw)
 199
 200     @classmethod
 201     def find_cls(cls, light_type):
 202         [light_class] = [
 203             c for c in cls.__subclasses__()
 204             if c.__name__.lower() == light_type]
 205         return light_class
 206
 207     def add(self, space):
 208         if self.body.space is not None:
 209             space.remove(self.body, *self.body.shapes)
 210         space.add(self.body, self.fitting)
 211         self.ray_manager.set_space(space)
 212         self.ray_manager.update_shapes()
 213
 214     def remove(self, space):
 215         if self.body.space is not None:
 216             space.remove(self.body, *self.body.shapes)
 217
 218     def _cached_surface(self, name, surface):
 219         surf = self._surface_cache.get(name)
 220         if surf is None:
 221             surf = self._surface_cache[name] = pygame.surface.Surface(
 222                 surface.get_size(), pgl.SWSURFACE
 223             ).convert_alpha()
 224         return surf
 225
 226     def light_colour(self):
 227         light_colour = COLOURS[self.colour]
 228         intensity = int(255 * self.intensity)
 229         return light_colour + (intensity,)
 230
 231     def render_light(self, surface):
 232         if not self.on:
 233             return
 234
 235         dt = DetailedTimer("render_light")
 236         dt.start()
 237
 238         max_radius = self.ray_manager.max_radius
 239         min_radius = self.ray_manager.min_radius
 240         dest_rect = self.ray_manager.pygame_rect(surface)
 241
 242         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 243         light_colour = self.light_colour()
 244
 245         radius_mask = self._cached_surface('radius_mask', surface)
 246         radius_mask.set_clip(dest_rect)
 247         ray_mask = self._cached_surface('ray_mask', surface)
 248         ray_mask.set_clip(dest_rect)
 249
 250         ray_mask.fill(black)
 251         for pygame_poly in self.ray_manager.pygame_polys(surface):
 252             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 253             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 254         dt.lap("ray mask rendered")
 255
 256         radius_mask.fill(black)
 257         centre = self.ray_manager.pygame_position(surface)
 258         pygame.draw.circle(
 259             radius_mask, light_colour, centre, int(max_radius), 0)
 260         pygame.draw.circle(
 261             radius_mask, black, centre, int(min_radius), 0)
 262         dt.lap("radius mask rendered")
 263
 264         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 265         dt.lap("blitted radius mask to ray mask")
 266
 267         surface.blit(ray_mask, dest_rect, dest_rect)
 268         dt.lap("blitted surface")
 269         dt.end()
 270
 271     def fitting_image(self):
 272         if self._fitting_image is None:
 273             self._fitting_image = loader.load_image(
 274                 "48", self.FITTING_IMG,
 275                 transform=ColourWedges(colours=self.colour_cycle))
 276         return self._fitting_image
 277
 278     def invalidate_fitting_image(self):
 279         self._fitting_image = None
 280
 281     def render_fitting(self, surface):
 282         rx, ry = self.ray_manager.pygame_position(surface)
 283         surface.blit(self.fitting_image(), (rx - 24, ry - 24), None, 0)
 284
 285     def power_usage(self):
 286         if not self.on:
 287             return 0.0
 288         area = math.pi * (self.ray_manager.max_radius ** 2)  # radius
 289         area = area * (self.ray_manager.spread / (2 * math.pi))  # spread
 290         return 5 * area * self.intensity / 6400  # 80x80 unit area
 291
 292     def base_damage(self):
 293         return 10 * self.intensity
 294
 295     def off(self):
 296         self.on = False
 297
 298     def toggle(self):
 299         self.colour_pos += 1
 300         if self.colour_pos >= len(self.colour_cycle):
 301             self.colour = self.colour_cycle[0]
 302             self.colour_pos = -1
 303             self.on = False
 304         else:
 305             self.colour = self.colour_cycle[self.colour_pos]
 306             self.on = True
 307
 308     def tick(self):
 309         pass
 310
 311
 312 class Lamp(BaseLight):
 313
 314     FITTING_IMG = "lamp.png"
 315
 316
 317 class PulsatingLamp(BaseLight):
 318
 319     FITTING_IMG = "pulsatinglamp.png"
 320     DEFAULT_PULSE_RANGE = (20, 100)
 321     DEFAULT_PULSE_VELOCITY = 2
 322     DEFAULT_INTENSITY_RANGE = (0.0, 0.9)
 323     DEFAULT_INTENSITY_VELOCITY = 0.1
 324
 325     def __init__(self, **kw):
 326         self.pulse_range = kw.pop("pulse_range", self.DEFAULT_PULSE_RANGE)
 327         self.pulse_velocity = kw.pop(
 328             "pulse_velocity", self.DEFAULT_PULSE_VELOCITY)
 329         self.intensity_range = kw.pop(
 330             "intensity_range", self.DEFAULT_INTENSITY_RANGE)
 331         self.intensity_velocity = kw.pop(
 332             "intensity_velocity", self.DEFAULT_INTENSITY_VELOCITY)
 333         super(PulsatingLamp, self).__init__(
 334             bounding_radius=self.pulse_range[1], **kw)
 335
 336     def serialize(self):
 337         result = super(PulsatingLamp, self).serialize()
 338         result["pulse_velocity"] = self.pulse_velocity
 339         result["intensity_range"] = self.intensity_range
 340         result["intensity_velocity"] = self.intensity_velocity
 341         return result
 342
 343     def _update_range(self, value, velocity, value_range):
 344         value += velocity
 345         if value < value_range[0]:
 346             value = value_range[0]
 347             velocity = -velocity
 348         elif value > value_range[1]:
 349             value = value_range[1]
 350             velocity = -velocity
 351         return value, velocity
 352
 353     def tick(self):
 354         self.ray_manager.max_radius, self.pulse_velocity = self._update_range(
 355             self.ray_manager.max_radius, self.pulse_velocity, self.pulse_range)
 356         self.intensity, self.intensity_velocity = self._update_range(
 357             self.intensity, self.intensity_velocity, self.intensity_range)
 358
 359
 360 class SpotLight(BaseLight):
 361
 362     FITTING_IMG = "spotlight.png"
 363
 364     def __init__(self, **kw):
 365         self.angular_velocity = kw.pop("angular_velocity", None)
 366         super(SpotLight, self).__init__(**kw)
 367
 368     def serialize(self):
 369         result = super(SpotLight, self).serialize()
 370         result["angular_velocity"] = self.angular_velocity
 371         return result
 372
 373     def fitting_image(self):
 374         fitting_image = super(SpotLight, self).fitting_image()
 375         rot_fitting_image = pygame.transform.rotozoom(
 376             fitting_image, self.ray_manager.direction - 90, 1)
 377
 378         rot_rect = fitting_image.get_rect().copy()
 379         rot_rect.center = rot_fitting_image.get_rect().center
 380         rot_fitting_image = rot_fitting_image.subsurface(rot_rect).copy()
 381
 382         return rot_fitting_image
 383
 384     def tick(self):
 385         if self.angular_velocity:
 386             self.ray_manager.direction -= self.angular_velocity
 387             self.ray_manager.update_shapes()