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