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