tabakrolletjie/lights.py

   1 """ May it be a light for you in dark places, when all other lights go out.
   2 """
   3
   4 import pymunk
   5 import pymunk.pygame_util
   6 import pygame.display
   7 import pygame.draw
   8 import pygame.locals as pgl
   9 import pygame.rect
  10
  11 from .constants import LIGHT_CATEGORY, FITTINGS_CATEGORY, COLOURS
  12 from .rays import RayPolyManager
  13 from .utils import DetailedTimer
  14 from .loader import loader
  15 from .transforms import Multiply
  16
  17 LIGHT_FILTER = pymunk.ShapeFilter(
  18     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  19         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  20     categories=LIGHT_CATEGORY)
  21
  22 FITTINGS_FILTER = pymunk.ShapeFilter(
  23     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  24         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  25     categories=FITTINGS_CATEGORY)
  26
  27 # Just match lights, nothing else
  28 LIT_BY_FILTER = pymunk.ShapeFilter(mask=LIGHT_CATEGORY)
  29
  30
  31 class LightManager(object):
  32     """ Manages a set of lights. """
  33
  34     def __init__(self, space, gamestate):
  35         self._space = space
  36         self._lights = [
  37             BaseLight.load(cfg) for cfg in gamestate.station["lights"]]
  38         for light in self._lights:
  39             light.add(self._space)
  40
  41     def add_light(self, cfg):
  42         light = BaseLight.load(cfg)
  43         self._lights.append(light)
  44         light.add(self._space)
  45
  46     def toggle_nearest(self, *args, **kw):
  47         light = self.nearest(*args, **kw)
  48         if light:
  49             light.toggle()
  50
  51     def nearest(self, pos, surfpos=False, max_distance=1.0):
  52         if surfpos:
  53             surface = pygame.display.get_surface()
  54             pos = pymunk.pygame_util.from_pygame(pos, surface)
  55         point_info = self._space.point_query_nearest(
  56             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  57         if point_info is not None:
  58             return point_info.shape.body.light
  59         return None
  60
  61     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  62         if surfpos:
  63             surface = pygame.display.get_surface()
  64             pos = pymunk.pygame_util.from_pygame(pos, surface)
  65         point_info_list = self._space.point_query(
  66             pos, max_distance, pymunk.ShapeFilter(mask=LIGHT_CATEGORY))
  67         lights = [p.shape.body.light for p in point_info_list]
  68         return [
  69             light for light in lights
  70             if light.on and light.ray_manager.reaches(pos)
  71         ]
  72
  73     def light_query(self, shape):
  74         """Query the lights by shape"""
  75         old_filter = shape.filter
  76         # We need to restrict matches to only the lights
  77         shape.filter = LIT_BY_FILTER
  78         shape_info_list = self._space.shape_query(shape)
  79         shape.filter = old_filter
  80         lights = [p.shape.body.light for p in shape_info_list]
  81         return [
  82             light for light in lights
  83             if light.on and light.ray_manager.reaches(shape.body.position)
  84         ]
  85
  86     def render_light(self, surface):
  87         for light in self._lights:
  88             light.render_light(surface)
  89
  90     def render_fittings(self, surface):
  91         for light in self._lights:
  92             light.render_fitting(surface)
  93
  94     def tick(self):
  95         for light in self._lights:
  96             light.tick()
  97
  98
  99 class BaseLight(object):
 100     """ Common light functionality. """
 101
 102     # defaults
 103     RAY_MANAGER = RayPolyManager
 104     FITTING_IMG = None
 105     FITTING_RADIUS = 24.0
 106
 107     # cached surfaces
 108     _surface_cache = {}
 109
 110     def __init__(
 111             self, colours, position, intensity=1.0, radius_limits=None,
 112             direction=None, spread=None):
 113         self.colour_cycle = colours
 114         self.colour_pos = 0
 115         self.colour = colours[0]
 116         self.on = True
 117         self.intensity = intensity
 118         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 119         self.body.light = self
 120         self.ray_manager = self.RAY_MANAGER(
 121             self.body, position, ray_filter=LIGHT_FILTER,
 122             radius_limits=radius_limits, direction=direction, spread=spread)
 123         self.fitting = pymunk.Circle(
 124             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 125         self.fitting.filter = FITTINGS_FILTER
 126         self._fitting_image = None
 127
 128     @property
 129     def position(self):
 130         return self.ray_manager.position
 131
 132     @classmethod
 133     def load(cls, config):
 134         kw = config.copy()
 135         light_type = kw.pop("type")
 136         [light_class] = [
 137             c for c in cls.__subclasses__()
 138             if c.__name__.lower() == light_type]
 139         return light_class(**kw)
 140
 141     def add(self, space):
 142         if self.body.space is not None:
 143             space.remove(self.body, *self.body.shapes)
 144         space.add(self.body, self.fitting)
 145         self.ray_manager.set_space(space)
 146         self.ray_manager.update_shapes()
 147
 148     def _cached_surface(self, name, surface):
 149         surf = self._surface_cache.get(name)
 150         if surf is None:
 151             surf = self._surface_cache[name] = pygame.surface.Surface(
 152                 surface.get_size(), pgl.SWSURFACE
 153             ).convert_alpha()
 154         return surf
 155
 156     def light_colour(self):
 157         light_colour = COLOURS[self.colour]
 158         intensity = int(255 * self.intensity)
 159         return light_colour + (intensity,)
 160
 161     def render_light(self, surface):
 162         if not self.on:
 163             return
 164
 165         dt = DetailedTimer("render_light")
 166         dt.start()
 167
 168         max_radius = self.ray_manager.max_radius
 169         min_radius = self.ray_manager.min_radius
 170         dest_rect = self.ray_manager.pygame_rect(surface)
 171
 172         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 173         light_colour = self.light_colour()
 174
 175         radius_mask = self._cached_surface('radius_mask', surface)
 176         radius_mask.set_clip(dest_rect)
 177         ray_mask = self._cached_surface('ray_mask', surface)
 178         ray_mask.set_clip(dest_rect)
 179
 180         ray_mask.fill(black)
 181         for pygame_poly in self.ray_manager.pygame_polys(surface):
 182             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 183             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 184         dt.lap("ray mask rendered")
 185
 186         radius_mask.fill(black)
 187         centre = self.ray_manager.pygame_position(surface)
 188         pygame.draw.circle(
 189             radius_mask, light_colour, centre, int(max_radius), 0)
 190         pygame.draw.circle(
 191             radius_mask, black, centre, int(min_radius), 0)
 192         dt.lap("radius mask rendered")
 193
 194         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 195         dt.lap("blitted radius mask to ray mask")
 196
 197         surface.blit(ray_mask, dest_rect, dest_rect)
 198         dt.lap("blitted surface")
 199         dt.end()
 200
 201     def fitting_image(self):
 202         if self._fitting_image is None:
 203             fitting_colour = COLOURS[self.colour]
 204             self._fitting_image = loader.load_image(
 205                 "48", self.FITTING_IMG,
 206                 transform=Multiply(colour=fitting_colour))
 207         return self._fitting_image
 208
 209     def invalidate_fitting_image(self):
 210         self._fitting_image = None
 211
 212     def render_fitting(self, surface):
 213         rx, ry = self.ray_manager.pygame_position(surface)
 214         surface.blit(self.fitting_image(), (rx - 24, ry - 24), None, 0)
 215
 216     def toggle(self):
 217         self.colour_pos += 1
 218         if self.colour_pos >= len(self.colour_cycle):
 219             self.colour = self.colour_cycle[0]
 220             self.colour_pos = -1
 221             self.on = False
 222         else:
 223             self.colour = self.colour_cycle[self.colour_pos]
 224             self.on = True
 225         self.invalidate_fitting_image()
 226
 227     def tick(self):
 228         pass
 229
 230
 231 class Lamp(BaseLight):
 232
 233     FITTING_IMG = "lamp.png"
 234
 235
 236 class MultiColourLamp(BaseLight):
 237
 238     FITTING_IMG = "lamp.png"
 239
 240     def __init__(self, **kw):
 241         super(MultiColourLamp, self).__init__(**kw)
 242
 243
 244 class PulsatingLamp(BaseLight):
 245
 246     FITTING_IMG = "lamp.png"
 247     DEFAULT_PULSE_RANGE = (20, 100)
 248     DEFAULT_PULSE_VELOCITY = 2
 249     DEFAULT_INTENSITY_RANGE = (0.0, 0.9)
 250     DEFAULT_INTENSITY_VELOCITY = 0.1
 251
 252     def __init__(self, **kw):
 253         self.pulse_range = kw.pop("pulse_range", self.DEFAULT_PULSE_RANGE)
 254         self.pulse_velocity = kw.pop(
 255             "pulse_velocity", self.DEFAULT_PULSE_VELOCITY)
 256         self.intensity_range = kw.pop(
 257             "intensity_range", self.DEFAULT_INTENSITY_RANGE)
 258         self.intensity_velocity = kw.pop(
 259             "intensity_velocity", self.DEFAULT_INTENSITY_VELOCITY)
 260         super(PulsatingLamp, self).__init__(**kw)
 261
 262     def _update_range(self, value, velocity, value_range):
 263         value += velocity
 264         if value < value_range[0]:
 265             value = value_range[0]
 266             velocity = -velocity
 267         elif value > value_range[1]:
 268             value = value_range[1]
 269             velocity = -velocity
 270         return value, velocity
 271
 272     def tick(self):
 273         self.ray_manager.max_radius, self.pulse_velocity = self._update_range(
 274             self.ray_manager.max_radius, self.pulse_velocity, self.pulse_range)
 275         self.intensity, self.intensity_velocity = self._update_range(
 276             self.intensity, self.intensity_velocity, self.intensity_range)
 277
 278
 279 class SpotLight(BaseLight):
 280
 281     FITTING_IMG = "spotlight.png"
 282
 283     def __init__(self, **kw):
 284         self.angular_velocity = kw.pop("angular_velocity", None)
 285         super(SpotLight, self).__init__(**kw)
 286
 287     def tick(self):
 288         if self.angular_velocity:
 289             self.ray_manager.direction -= self.angular_velocity
 290             self.ray_manager.update_shapes()