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 toggle_nearest(self, *args, **kw):
  42         light = self.nearest(*args, **kw)
  43         if light:
  44             light.toggle()
  45
  46     def nearest(self, pos, surfpos=False, max_distance=1.0):
  47         if surfpos:
  48             surface = pygame.display.get_surface()
  49             pos = pymunk.pygame_util.from_pygame(pos, surface)
  50         point_info = self._space.point_query_nearest(
  51             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  52         if point_info is not None:
  53             return point_info.shape.body.light
  54         return None
  55
  56     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  57         if surfpos:
  58             surface = pygame.display.get_surface()
  59             pos = pymunk.pygame_util.from_pygame(pos, surface)
  60         point_info_list = self._space.point_query(
  61             pos, max_distance, pymunk.ShapeFilter(mask=LIGHT_CATEGORY))
  62         lights = [p.shape.body.light for p in point_info_list]
  63         return [light for light in lights if light.on]
  64
  65     def light_query(self, shape):
  66         """Query the lights by shape"""
  67         old_filter = shape.filter
  68         # We need to restrict matches to only the lights
  69         shape.filter = LIT_BY_FILTER
  70         shape_info_list = self._space.shape_query(shape)
  71         shape.filter = old_filter
  72         lights = [p.shape.body.light for p in shape_info_list]
  73         return [light for light in lights if light.on]
  74
  75     def render_light(self, surface):
  76         for light in self._lights:
  77             light.render_light(surface)
  78
  79     def render_fittings(self, surface):
  80         for light in self._lights:
  81             light.render_fitting(surface)
  82
  83     def tick(self):
  84         for light in self._lights:
  85             light.tick()
  86
  87
  88 class BaseLight(object):
  89     """ Common light functionality. """
  90
  91     COLOURS = {
  92         "red": (255, 0, 0),
  93         "green": (0, 255, 0),
  94         "blue": (0, 255, 255),
  95         "yellow": (255, 255, 0),
  96         "white": (255, 255, 255),
  97     }
  98
  99     # defaults
 100     RAY_MANAGER = RayPolyManager
 101     FITTING_IMG = None
 102     FITTING_RADIUS = 10.0
 103
 104     # cached surfaces
 105     _surface_cache = {}
 106
 107     def __init__(
 108             self, colour, position, intensity=1.0, radius_limits=None,
 109             angle_limits=None):
 110         self.colour = colour
 111         self.on = True
 112         self.intensity = intensity
 113         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 114         self.body.light = self
 115         self.ray_manager = self.RAY_MANAGER(
 116             self.body, position, ray_filter=LIGHT_FILTER,
 117             radius_limits=radius_limits, angle_limits=angle_limits)
 118         self.fitting = pymunk.Circle(
 119             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 120         self.fitting.filter = FITTINGS_FILTER
 121         self._image = None
 122
 123     @property
 124     def position(self):
 125         return self.ray_manager.position
 126
 127     @classmethod
 128     def load(cls, config):
 129         kw = config.copy()
 130         light_type = kw.pop("type")
 131         [light_class] = [
 132             c for c in cls.__subclasses__()
 133             if c.__name__.lower() == light_type]
 134         return light_class(**kw)
 135
 136     def add(self, space):
 137         if self.body.space is not None:
 138             space.remove(self.body, *self.body.shapes)
 139         space.add(self.body, self.fitting)
 140         self.ray_manager.set_space(space)
 141         self.ray_manager.update_shapes()
 142
 143     def toggle(self):
 144         self.on = not self.on
 145
 146     def _cached_surface(self, name, surface):
 147         surf = self._surface_cache.get(name)
 148         if surf is None:
 149             surf = self._surface_cache[name] = pygame.surface.Surface(
 150                 surface.get_size(), pgl.SWSURFACE
 151             ).convert_alpha()
 152         return surf
 153
 154     def light_colour(self):
 155         light_colour = self.COLOURS[self.colour]
 156         intensity = int(255 * self.intensity)
 157         return light_colour + (intensity,)
 158
 159     def render_light(self, surface):
 160         if not self.on:
 161             return
 162
 163         dt = DetailedTimer("render_light")
 164         dt.start()
 165
 166         max_radius = self.ray_manager.max_radius
 167         min_radius = self.ray_manager.min_radius
 168         dest_rect = self.ray_manager.pygame_rect(surface)
 169
 170         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 171         light_colour = self.light_colour()
 172
 173         radius_mask = self._cached_surface('radius_mask', surface)
 174         radius_mask.set_clip(dest_rect)
 175         ray_mask = self._cached_surface('ray_mask', surface)
 176         ray_mask.set_clip(dest_rect)
 177
 178         ray_mask.fill(black)
 179         for pygame_poly in self.ray_manager.pygame_polys(surface):
 180             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 181             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 182         dt.lap("ray mask rendered")
 183
 184         radius_mask.fill(black)
 185         centre = self.ray_manager.pygame_position(surface)
 186         pygame.draw.circle(
 187             radius_mask, light_colour, centre, int(max_radius), 0)
 188         pygame.draw.circle(
 189             radius_mask, black, centre, int(min_radius), 0)
 190         dt.lap("radius mask rendered")
 191
 192         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 193         dt.lap("blitted radius mask to ray mask")
 194
 195         surface.blit(ray_mask, dest_rect, dest_rect)
 196         dt.lap("blitted surface")
 197         dt.end()
 198
 199     def get_image(self):
 200         if self._image is None:
 201             fitting_colour = self.COLOURS[self.colour]
 202             self._image = loader.load_image(
 203                 "64", self.FITTING_IMG,
 204                 transform=Multiply(colour=fitting_colour))
 205         return self._image
 206
 207     def render_fitting(self, surface):
 208         rx, ry = self.ray_manager.pygame_position(surface)
 209         surface.blit(self.get_image(), (rx - 32, ry - 32), None, 0)
 210
 211     def tick(self):
 212         pass
 213
 214
 215 class Lamp(BaseLight):
 216     FITTING_IMG = "lamp.png"
 217
 218     def __init__(self, **kw):
 219         kw.pop("direction", None)
 220         kw.pop("spread", None)
 221         super(Lamp, self).__init__(**kw)
 222
 223
 224 class SpotLight(BaseLight):
 225     FITTING_IMG = "spotlight.png"
 226
 227     def __init__(self, **kw):
 228         kw.pop("direction", None)
 229         kw.pop("spread", None)
 230         self.angular_velocity = kw.pop("angular_velocity", None)
 231         super(SpotLight, self).__init__(**kw)
 232
 233     def tick(self):
 234         if self.angular_velocity:
 235             self.ray_manager.rotate_degrees(self.angular_velocity)
 236             self.ray_manager.update_shapes()