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 Multiply
  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, pymunk.ShapeFilter(mask=LIGHT_CATEGORY))
  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_image(size, base_image_name, colours):
 106     """ Render a light fitting image. """
 107     size = str(size)
 108     fitting_colours = [COLOURS[c] for c in colours]
 109     ncolour = len(fitting_colours)
 110     if ncolour > 3:
 111         print "Multicoloured light should not have more than 3 colours"
 112         ncolour = 3
 113
 114     if ncolour == 1:
 115         return loader.load_image(
 116             size, base_image_name,
 117             transform=Multiply(colour=fitting_colours[0]))
 118
 119     colour_mult_image = pygame.surface.Surface((48, 48))
 120     for i in range(ncolour):
 121         sector = loader.load_image(
 122             size, "light_mask_%d_%d.png" % (ncolour, i + 1),
 123             transform=Multiply(colour=fitting_colours[i]))
 124         colour_mult_image.blit(sector, (0, 0), None, 0)
 125
 126     fitting_image = loader.load_image(size, base_image_name)
 127     fitting_image.blit(colour_mult_image, (0, 0), None, pgl.BLEND_RGBA_MULT)
 128     return fitting_image
 129
 130
 131 class BaseLight(object):
 132     """ Common light functionality. """
 133
 134     # defaults
 135     RAY_MANAGER = RayPolyManager
 136     FITTING_IMG = None
 137     FITTING_RADIUS = 24.0
 138
 139     # cached surfaces
 140     _surface_cache = {}
 141
 142     def __init__(
 143             self, colours, position, intensity=1.0, radius_limits=None,
 144             direction=None, spread=None):
 145         self.colour_cycle = colours
 146         self.colour_pos = 0
 147         self.colour = colours[0]
 148         self.on = True
 149         self.intensity = intensity
 150         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 151         self.body.light = self
 152         self.ray_manager = self.RAY_MANAGER(
 153             self.body, position, ray_filter=LIGHT_FILTER,
 154             radius_limits=radius_limits, direction=direction, spread=spread)
 155         self.fitting = pymunk.Circle(
 156             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 157         self.fitting.filter = FITTINGS_FILTER
 158         self._fitting_image = None
 159         self._colour_mult_image = None
 160
 161     @property
 162     def position(self):
 163         return self.ray_manager.position
 164
 165     @classmethod
 166     def load(cls, config):
 167         kw = config.copy()
 168         light_type = kw.pop("type")
 169         [light_class] = [
 170             c for c in cls.__subclasses__()
 171             if c.__name__.lower() == light_type]
 172         return light_class(**kw)
 173
 174     def add(self, space):
 175         if self.body.space is not None:
 176             space.remove(self.body, *self.body.shapes)
 177         space.add(self.body, self.fitting)
 178         self.ray_manager.set_space(space)
 179         self.ray_manager.update_shapes()
 180
 181     def _cached_surface(self, name, surface):
 182         surf = self._surface_cache.get(name)
 183         if surf is None:
 184             surf = self._surface_cache[name] = pygame.surface.Surface(
 185                 surface.get_size(), pgl.SWSURFACE
 186             ).convert_alpha()
 187         return surf
 188
 189     def light_colour(self):
 190         light_colour = COLOURS[self.colour]
 191         intensity = int(255 * self.intensity)
 192         return light_colour + (intensity,)
 193
 194     def render_light(self, surface):
 195         if not self.on:
 196             return
 197
 198         dt = DetailedTimer("render_light")
 199         dt.start()
 200
 201         max_radius = self.ray_manager.max_radius
 202         min_radius = self.ray_manager.min_radius
 203         dest_rect = self.ray_manager.pygame_rect(surface)
 204
 205         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 206         light_colour = self.light_colour()
 207
 208         radius_mask = self._cached_surface('radius_mask', surface)
 209         radius_mask.set_clip(dest_rect)
 210         ray_mask = self._cached_surface('ray_mask', surface)
 211         ray_mask.set_clip(dest_rect)
 212
 213         ray_mask.fill(black)
 214         for pygame_poly in self.ray_manager.pygame_polys(surface):
 215             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 216             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 217         dt.lap("ray mask rendered")
 218
 219         radius_mask.fill(black)
 220         centre = self.ray_manager.pygame_position(surface)
 221         pygame.draw.circle(
 222             radius_mask, light_colour, centre, int(max_radius), 0)
 223         pygame.draw.circle(
 224             radius_mask, black, centre, int(min_radius), 0)
 225         dt.lap("radius mask rendered")
 226
 227         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 228         dt.lap("blitted radius mask to ray mask")
 229
 230         surface.blit(ray_mask, dest_rect, dest_rect)
 231         dt.lap("blitted surface")
 232         dt.end()
 233
 234     def fitting_image(self):
 235         if self._fitting_image is None:
 236             self._fitting_image = light_fitting_image(
 237                 48, self.FITTING_IMG, self.colour_cycle)
 238         return self._fitting_image
 239
 240     def invalidate_fitting_image(self):
 241         self._fitting_image = None
 242
 243     def render_fitting(self, surface):
 244         rx, ry = self.ray_manager.pygame_position(surface)
 245         surface.blit(self.fitting_image(), (rx - 24, ry - 24), None, 0)
 246
 247     def power_usage(self):
 248         if not self.on:
 249             return 0.0
 250         area = math.pi * (self.ray_manager.max_radius ** 2)  # radius
 251         area = area * (self.ray_manager.spread / (2 * math.pi))  # spread
 252         return 5 * area * self.intensity / 6400  # 80x80 unit area
 253
 254     def base_damage(self):
 255         return 5 * self.intensity
 256
 257     def toggle(self):
 258         self.colour_pos += 1
 259         if self.colour_pos >= len(self.colour_cycle):
 260             self.colour = self.colour_cycle[0]
 261             self.colour_pos = -1
 262             self.on = False
 263         else:
 264             self.colour = self.colour_cycle[self.colour_pos]
 265             self.on = True
 266
 267     def tick(self):
 268         pass
 269
 270
 271 class Lamp(BaseLight):
 272
 273     FITTING_IMG = "lamp.png"
 274
 275
 276 class PulsatingLamp(BaseLight):
 277
 278     FITTING_IMG = "lamp.png"
 279     DEFAULT_PULSE_RANGE = (20, 100)
 280     DEFAULT_PULSE_VELOCITY = 2
 281     DEFAULT_INTENSITY_RANGE = (0.0, 0.9)
 282     DEFAULT_INTENSITY_VELOCITY = 0.1
 283
 284     def __init__(self, **kw):
 285         self.pulse_range = kw.pop("pulse_range", self.DEFAULT_PULSE_RANGE)
 286         self.pulse_velocity = kw.pop(
 287             "pulse_velocity", self.DEFAULT_PULSE_VELOCITY)
 288         self.intensity_range = kw.pop(
 289             "intensity_range", self.DEFAULT_INTENSITY_RANGE)
 290         self.intensity_velocity = kw.pop(
 291             "intensity_velocity", self.DEFAULT_INTENSITY_VELOCITY)
 292         super(PulsatingLamp, self).__init__(**kw)
 293
 294     def _update_range(self, value, velocity, value_range):
 295         value += velocity
 296         if value < value_range[0]:
 297             value = value_range[0]
 298             velocity = -velocity
 299         elif value > value_range[1]:
 300             value = value_range[1]
 301             velocity = -velocity
 302         return value, velocity
 303
 304     def tick(self):
 305         self.ray_manager.max_radius, self.pulse_velocity = self._update_range(
 306             self.ray_manager.max_radius, self.pulse_velocity, self.pulse_range)
 307         self.intensity, self.intensity_velocity = self._update_range(
 308             self.intensity, self.intensity_velocity, self.intensity_range)
 309
 310
 311 class SpotLight(BaseLight):
 312
 313     FITTING_IMG = "spotlight.png"
 314
 315     def __init__(self, **kw):
 316         self.angular_velocity = kw.pop("angular_velocity", None)
 317         super(SpotLight, self).__init__(**kw)
 318
 319     def fitting_image(self):
 320         fitting_image = super(SpotLight, self).fitting_image()
 321         rot_fitting_image = pygame.transform.rotozoom(
 322             fitting_image, self.ray_manager.direction - 90, 1)
 323
 324         rot_rect = fitting_image.get_rect().copy()
 325         rot_rect.center = rot_fitting_image.get_rect().center
 326         rot_fitting_image = rot_fitting_image.subsurface(rot_rect).copy()
 327
 328         return rot_fitting_image
 329
 330     def tick(self):
 331         if self.angular_velocity:
 332             self.ray_manager.direction -= self.angular_velocity
 333             self.ray_manager.update_shapes()