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