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 [light for light in lights if light.on]
  69
  70     def light_query(self, shape):
  71         """Query the lights by shape"""
  72         old_filter = shape.filter
  73         # We need to restrict matches to only the lights
  74         shape.filter = LIT_BY_FILTER
  75         shape_info_list = self._space.shape_query(shape)
  76         shape.filter = old_filter
  77         lights = [p.shape.body.light for p in shape_info_list]
  78         return [light for light in lights if light.on]
  79
  80     def render_light(self, surface):
  81         for light in self._lights:
  82             light.render_light(surface)
  83
  84     def render_fittings(self, surface):
  85         for light in self._lights:
  86             light.render_fitting(surface)
  87
  88     def tick(self):
  89         for light in self._lights:
  90             light.tick()
  91
  92
  93 class BaseLight(object):
  94     """ Common light functionality. """
  95
  96     COLOURS = {
  97         "red": (255, 0, 0),
  98         "green": (0, 255, 0),
  99         "blue": (0, 0, 255),
 100         "cyan": (0, 255, 255),
 101         "yellow": (255, 255, 0),
 102         "white": (255, 255, 255),
 103     }
 104
 105     # defaults
 106     RAY_MANAGER = RayPolyManager
 107     FITTING_IMG = None
 108     FITTING_RADIUS = 24.0
 109
 110     # cached surfaces
 111     _surface_cache = {}
 112
 113     def __init__(
 114             self, colour, position, intensity=1.0, radius_limits=None,
 115             angle_limits=None):
 116         self.colour = colour
 117         self.on = True
 118         self.intensity = intensity
 119         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 120         self.body.light = self
 121         self.ray_manager = self.RAY_MANAGER(
 122             self.body, position, ray_filter=LIGHT_FILTER,
 123             radius_limits=radius_limits, angle_limits=angle_limits)
 124         self.fitting = pymunk.Circle(
 125             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 126         self.fitting.filter = FITTINGS_FILTER
 127         self._image = None
 128
 129     @property
 130     def position(self):
 131         return self.ray_manager.position
 132
 133     @classmethod
 134     def load(cls, config):
 135         kw = config.copy()
 136         light_type = kw.pop("type")
 137         [light_class] = [
 138             c for c in cls.__subclasses__()
 139             if c.__name__.lower() == light_type]
 140         return light_class(**kw)
 141
 142     def add(self, space):
 143         if self.body.space is not None:
 144             space.remove(self.body, *self.body.shapes)
 145         space.add(self.body, self.fitting)
 146         self.ray_manager.set_space(space)
 147         self.ray_manager.update_shapes()
 148
 149     def toggle(self):
 150         self.on = not self.on
 151
 152     def _cached_surface(self, name, surface):
 153         surf = self._surface_cache.get(name)
 154         if surf is None:
 155             surf = self._surface_cache[name] = pygame.surface.Surface(
 156                 surface.get_size(), pgl.SWSURFACE
 157             ).convert_alpha()
 158         return surf
 159
 160     def light_colour(self):
 161         light_colour = self.COLOURS[self.colour]
 162         intensity = int(255 * self.intensity)
 163         return light_colour + (intensity,)
 164
 165     def render_light(self, surface):
 166         if not self.on:
 167             return
 168
 169         dt = DetailedTimer("render_light")
 170         dt.start()
 171
 172         max_radius = self.ray_manager.max_radius
 173         min_radius = self.ray_manager.min_radius
 174         dest_rect = self.ray_manager.pygame_rect(surface)
 175
 176         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 177         light_colour = self.light_colour()
 178
 179         radius_mask = self._cached_surface('radius_mask', surface)
 180         radius_mask.set_clip(dest_rect)
 181         ray_mask = self._cached_surface('ray_mask', surface)
 182         ray_mask.set_clip(dest_rect)
 183
 184         ray_mask.fill(black)
 185         for pygame_poly in self.ray_manager.pygame_polys(surface):
 186             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 187             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 188         dt.lap("ray mask rendered")
 189
 190         radius_mask.fill(black)
 191         centre = self.ray_manager.pygame_position(surface)
 192         pygame.draw.circle(
 193             radius_mask, light_colour, centre, int(max_radius), 0)
 194         pygame.draw.circle(
 195             radius_mask, black, centre, int(min_radius), 0)
 196         dt.lap("radius mask rendered")
 197
 198         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 199         dt.lap("blitted radius mask to ray mask")
 200
 201         surface.blit(ray_mask, dest_rect, dest_rect)
 202         dt.lap("blitted surface")
 203         dt.end()
 204
 205     def get_image(self):
 206         if self._image is None:
 207             fitting_colour = self.COLOURS[self.colour]
 208             self._image = loader.load_image(
 209                 "48", self.FITTING_IMG,
 210                 transform=Multiply(colour=fitting_colour))
 211         return self._image
 212
 213     def render_fitting(self, surface):
 214         rx, ry = self.ray_manager.pygame_position(surface)
 215         surface.blit(self.get_image(), (rx - 24, ry - 24), None, 0)
 216
 217     def tick(self):
 218         pass
 219
 220
 221 class Lamp(BaseLight):
 222     FITTING_IMG = "lamp.png"
 223
 224     def __init__(self, **kw):
 225         kw.pop("direction", None)
 226         kw.pop("spread", None)
 227         super(Lamp, self).__init__(**kw)
 228
 229
 230 class SpotLight(BaseLight):
 231     FITTING_IMG = "spotlight.png"
 232
 233     def __init__(self, **kw):
 234         kw.pop("direction", None)
 235         kw.pop("spread", None)
 236         self.angular_velocity = kw.pop("angular_velocity", None)
 237         super(SpotLight, self).__init__(**kw)
 238
 239     def tick(self):
 240         if self.angular_velocity:
 241             self.ray_manager.rotate_degrees(self.angular_velocity)
 242             self.ray_manager.update_shapes()