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     FITTING_IMG = None
 100
 101     # cached surfaces
 102     _surface_cache = {}
 103
 104     def __init__(
 105             self, colour, position, intensity=1.0,
 106             radius_limits=(None, None), angle_limits=None):
 107         self.colour = colour
 108         self.position = pymunk.Vec2d(position)
 109         self.on = True
 110         self.intensity = intensity
 111         self.radius_limits = radius_limits
 112         self.angle_limits = angle_limits
 113         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 114         self.fitting = pymunk.Circle(self.body, 10.0, self.position)
 115         self.fitting.filter = FITTINGS_FILTER
 116         self.body.light = self
 117         self.ray_manager = RayPolyManager(self.body, LIGHT_FILTER)
 118         self._image = None
 119
 120     @classmethod
 121     def load(cls, config):
 122         kw = config.copy()
 123         light_type = kw.pop("type")
 124         [light_class] = [
 125             c for c in cls.__subclasses__()
 126             if c.__name__.lower() == light_type]
 127         return light_class(**kw)
 128
 129     def add(self, space):
 130         if self.body.space is not None:
 131             space.remove(self.body, *self.body.shapes)
 132         self.ray_manager.generate_rays(space, self.position)
 133         self.ray_manager.set_angle_limits(self.angle_limits)
 134         ray_shapes = self.ray_manager.polys()
 135         space.add(self.body, self.fitting, *ray_shapes)
 136
 137     def shapes_for_ray_polys(self, ray_polys):
 138         return ray_polys
 139
 140     def toggle(self):
 141         self.on = not self.on
 142
 143     def _cached_surfaces(self, surface):
 144         radius_mask = self._surface_cache.get('radius_mask')
 145         if radius_mask is None:
 146             radius_mask = self._surface_cache['radius_mask'] = (
 147                 pygame.surface.Surface(
 148                     surface.get_size(), pgl.SWSURFACE)).convert_alpha()
 149
 150         ray_mask = self._surface_cache.get('ray_mask')
 151         if ray_mask is None:
 152             ray_mask = self._surface_cache['ray_mask'] = (
 153                 pygame.surface.Surface(
 154                     surface.get_size(), pgl.SWSURFACE)).convert_alpha()
 155
 156         return radius_mask, ray_mask
 157
 158     def render_light(self, surface):
 159         if not self.on:
 160             return
 161
 162         dt = DetailedTimer("render_light")
 163         dt.start()
 164         dt.show("%s, %s" % (self.ray_manager._start, self.ray_manager._end))
 165
 166         max_radius = self.radius_limits[1] or 50.0
 167         min_radius = self.radius_limits[0] or 0
 168
 169         rw = max_radius * 2
 170         rx, ry = pymunk.pygame_util.to_pygame(self.position, surface)
 171         dest_rect = pygame.rect.Rect(rx, ry, rw, rw)
 172         dest_rect.move_ip(- max_radius, - max_radius)
 173
 174         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 175
 176         radius_mask, ray_mask = self._cached_surfaces(surface)
 177         radius_mask.set_clip(dest_rect)
 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         light_colour = self.COLOURS[self.colour]
 187         intensity = int(255 * self.intensity)
 188         light_colour = light_colour + (intensity,)
 189
 190         radius_mask.fill(black)
 191         centre = pymunk.pygame_util.to_pygame(self.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 = pymunk.pygame_util.to_pygame(self.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             start, end = self.angle_limits
 242             start = (start + self.angular_velocity) % 360.0
 243             end = (end + self.angular_velocity) % 360.0
 244             self.angle_limits = (start, end)
 245             self.ray_manager.set_angle_limits(self.angle_limits)