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