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
  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     COLOURS = {
 103         "red": (255, 0, 0),
 104         "green": (0, 255, 0),
 105         "blue": (0, 0, 255),
 106         "cyan": (0, 255, 255),
 107         "yellow": (255, 255, 0),
 108         "magenta": (255, 0, 255),
 109         "white": (255, 255, 255),
 110     }
 111
 112     # defaults
 113     RAY_MANAGER = RayPolyManager
 114     FITTING_IMG = None
 115     FITTING_RADIUS = 24.0
 116
 117     # cached surfaces
 118     _surface_cache = {}
 119
 120     def __init__(
 121             self, colour, position, intensity=1.0, radius_limits=None,
 122             angle_limits=None):
 123         self.colour = colour
 124         self.on = True
 125         self.intensity = intensity
 126         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 127         self.body.light = self
 128         self.ray_manager = self.RAY_MANAGER(
 129             self.body, position, ray_filter=LIGHT_FILTER,
 130             radius_limits=radius_limits, angle_limits=angle_limits)
 131         self.fitting = pymunk.Circle(
 132             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 133         self.fitting.filter = FITTINGS_FILTER
 134         self._fitting_image = None
 135
 136     @property
 137     def position(self):
 138         return self.ray_manager.position
 139
 140     @classmethod
 141     def load(cls, config):
 142         kw = config.copy()
 143         light_type = kw.pop("type")
 144         [light_class] = [
 145             c for c in cls.__subclasses__()
 146             if c.__name__.lower() == light_type]
 147         return light_class(**kw)
 148
 149     def add(self, space):
 150         if self.body.space is not None:
 151             space.remove(self.body, *self.body.shapes)
 152         space.add(self.body, self.fitting)
 153         self.ray_manager.set_space(space)
 154         self.ray_manager.update_shapes()
 155
 156     def toggle(self):
 157         self.on = not self.on
 158
 159     def _cached_surface(self, name, surface):
 160         surf = self._surface_cache.get(name)
 161         if surf is None:
 162             surf = self._surface_cache[name] = pygame.surface.Surface(
 163                 surface.get_size(), pgl.SWSURFACE
 164             ).convert_alpha()
 165         return surf
 166
 167     def light_colour(self):
 168         light_colour = self.COLOURS[self.colour]
 169         intensity = int(255 * self.intensity)
 170         return light_colour + (intensity,)
 171
 172     def render_light(self, surface):
 173         if not self.on:
 174             return
 175
 176         dt = DetailedTimer("render_light")
 177         dt.start()
 178
 179         max_radius = self.ray_manager.max_radius
 180         min_radius = self.ray_manager.min_radius
 181         dest_rect = self.ray_manager.pygame_rect(surface)
 182
 183         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 184         light_colour = self.light_colour()
 185
 186         radius_mask = self._cached_surface('radius_mask', surface)
 187         radius_mask.set_clip(dest_rect)
 188         ray_mask = self._cached_surface('ray_mask', surface)
 189         ray_mask.set_clip(dest_rect)
 190
 191         ray_mask.fill(black)
 192         for pygame_poly in self.ray_manager.pygame_polys(surface):
 193             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 194             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 195         dt.lap("ray mask rendered")
 196
 197         radius_mask.fill(black)
 198         centre = self.ray_manager.pygame_position(surface)
 199         pygame.draw.circle(
 200             radius_mask, light_colour, centre, int(max_radius), 0)
 201         pygame.draw.circle(
 202             radius_mask, black, centre, int(min_radius), 0)
 203         dt.lap("radius mask rendered")
 204
 205         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 206         dt.lap("blitted radius mask to ray mask")
 207
 208         surface.blit(ray_mask, dest_rect, dest_rect)
 209         dt.lap("blitted surface")
 210         dt.end()
 211
 212     def fitting_image(self):
 213         if self._fitting_image is None:
 214             fitting_colour = self.COLOURS[self.colour]
 215             self._fitting_image = loader.load_image(
 216                 "48", self.FITTING_IMG,
 217                 transform=Multiply(colour=fitting_colour))
 218         return self._fitting_image
 219
 220     def invalidate_fitting_image(self):
 221         self._fitting_image = None
 222
 223     def render_fitting(self, surface):
 224         rx, ry = self.ray_manager.pygame_position(surface)
 225         surface.blit(self.fitting_image(), (rx - 24, ry - 24), None, 0)
 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     DEFAULT_COLOURS = sorted(BaseLight.COLOURS.keys())
 240
 241     def __init__(self, **kw):
 242         self.colour_cycle = kw.pop("colours", None)
 243         self.colour_pos = 0
 244         kw["colour"] = self.colour_cycle[0]
 245         super(MultiColourLamp, self).__init__(**kw)
 246
 247     def toggle(self):
 248         self.colour_pos += 1
 249         if self.colour_pos >= len(self.colour_cycle):
 250             self.colour = self.colour_cycle[0]
 251             self.colour_pos = -1
 252             self.on = False
 253         else:
 254             self.colour = self.colour_cycle[self.colour_pos]
 255             self.on = True
 256         self.invalidate_fitting_image()
 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.rotate_degrees(self.angular_velocity)
 305             self.ray_manager.update_shapes()