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
  10 from .constants import LIGHT_CATEGORY, FITTINGS_CATEGORY
  11 from .rays import calculate_ray_polys
  12
  13 LIGHT_FILTER = pymunk.ShapeFilter(
  14     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  15         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  16     categories=LIGHT_CATEGORY)
  17
  18 FITTINGS_FILTER = pymunk.ShapeFilter(
  19     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  20         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  21     categories=FITTINGS_CATEGORY)
  22
  23 # Just match lights, nothing else
  24 LIT_BY_FILTER = pymunk.ShapeFilter(mask=LIGHT_CATEGORY)
  25
  26
  27 class LightManager(object):
  28     """ Manages a set of lights. """
  29
  30     def __init__(self, space, gamestate):
  31         self._space = space
  32         self._lights = [
  33             BaseLight.load(cfg) for cfg in gamestate.station["lights"]]
  34         for light in self._lights:
  35             light.add(self._space)
  36
  37     def toggle_nearest(self, *args, **kw):
  38         light = self.nearest(*args, **kw)
  39         if light:
  40             light.toggle()
  41
  42     def nearest(self, pos, surfpos=False, max_distance=1.0):
  43         if surfpos:
  44             surface = pygame.display.get_surface()
  45             pos = pymunk.pygame_util.from_pygame(pos, surface)
  46         point_info = self._space.point_query_nearest(
  47             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  48         if point_info is not None:
  49             return point_info.shape.body.light
  50         return None
  51
  52     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  53         if surfpos:
  54             surface = pygame.display.get_surface()
  55             pos = pymunk.pygame_util.from_pygame(pos, surface)
  56         point_info_list = self._space.point_query(
  57             pos, max_distance, pymunk.ShapeFilter(mask=LIGHT_CATEGORY))
  58         lights = [p.shape.body.light for p in point_info_list]
  59         return [light for light in lights if light.on]
  60
  61     def light_query(self, shape):
  62         """Query the lights by shape"""
  63         old_filter = shape.filter
  64         # We need to restrict matches to only the lights
  65         shape.filter = LIT_BY_FILTER
  66         shape_info_list = self._space.shape_query(shape)
  67         shape.filter = old_filter
  68         lights = [p.shape.body.light for p in shape_info_list]
  69         return [light for light in lights if light.on]
  70
  71     def render_light(self, surface):
  72         for light in self._lights:
  73             light.render_light(surface)
  74
  75     def render_fittings(self, surface):
  76         for light in self._lights:
  77             light.render_fitting(surface)
  78
  79
  80 class BaseLight(object):
  81     """ Common light functionality. """
  82
  83     COLOURS = {
  84         "red": (255, 0, 0),
  85         "green": (0, 255, 0),
  86         "blue": (0, 255, 255),
  87         "yellow": (255, 255, 0),
  88         "white": (255, 255, 255),
  89     }
  90
  91     # cached surfaces
  92     _surface_cache = {}
  93
  94     def __init__(
  95             self, colour, position, intensity=1.0,
  96             radius_limits=(None, None), angle_limits=(None, None)):
  97         self.colour = colour
  98         self.position = pymunk.Vec2d(position)
  99         self.on = True
 100         self.intensity = intensity
 101         self.radius_limits = radius_limits
 102         self.angle_limits = angle_limits
 103         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 104         self.fitting = pymunk.Circle(self.body, 10.0, self.position)
 105         self.body.light = self
 106
 107     @classmethod
 108     def load(cls, config):
 109         kw = config.copy()
 110         light_type = kw.pop("type")
 111         [light_class] = [
 112             c for c in cls.__subclasses__()
 113             if c.__name__.lower() == light_type]
 114         return light_class(**kw)
 115
 116     def add(self, space):
 117         if self.body.space is not None:
 118             space.remove(self.body, *self.body.shapes)
 119         shapes = self.shapes_for_ray_polys(
 120             calculate_ray_polys(space, self.body, self.position, LIGHT_FILTER))
 121         for shape in shapes:
 122             shape.filter = LIGHT_FILTER
 123         self.fitting.filter = FITTINGS_FILTER
 124         space.add(self.body, self.fitting, *shapes)
 125
 126     def shapes_for_ray_polys(self, ray_polys):
 127         return ray_polys
 128
 129     def toggle(self):
 130         self.on = not self.on
 131
 132     def _cached_surfaces(self, surface):
 133         radius_mask = self._surface_cache.get('radius_mask')
 134         if radius_mask is None:
 135             radius_mask = self._surface_cache['radius_mask'] = (
 136                 pygame.surface.Surface(surface.get_size(), pgl.SWSURFACE))
 137
 138         ray_mask = self._surface_cache.get('ray_mask')
 139         if ray_mask is None:
 140             ray_mask = self._surface_cache['ray_mask'] = (
 141                 pygame.surface.Surface(surface.get_size(), pgl.SWSURFACE))
 142
 143         overlay_surf = self._surface_cache.get('overlay_surf')
 144         if overlay_surf is None:
 145             overlay_surf = self._surface_cache['overlay_surf'] = (
 146                 pygame.surface.Surface(
 147                     surface.get_size(), pgl.SWSURFACE | pgl.SRCALPHA))
 148
 149         return radius_mask, ray_mask, overlay_surf
 150
 151     def render_light(self, surface):
 152         if not self.on:
 153             return
 154
 155         radius_mask, ray_mask, overlay_surf = self._cached_surfaces(surface)
 156         white, black = (255, 255, 255), (0, 0, 0)
 157
 158         ray_mask.fill(black)
 159         for shape in self.body.shapes:
 160             if shape is self.fitting:
 161                 continue
 162             pygame_poly = [
 163                 pymunk.pygame_util.to_pygame(v, surface) for v in
 164                 shape.get_vertices()]
 165             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 166             pygame.draw.aalines(ray_mask, white, True, pygame_poly, 1)
 167
 168         radius_mask.fill(black)
 169         centre = pymunk.pygame_util.to_pygame(self.position, surface)
 170         max_radius = self.radius_limits[1] or 50.0
 171         min_radius = self.radius_limits[0] or 0
 172         width = max_radius - min_radius
 173         pygame.draw.circle(
 174             radius_mask, white, centre, int(max_radius), int(width))
 175         pygame.draw.circle(
 176             radius_mask, white, (centre[0] + 1, centre[1]),
 177             int(max_radius), int(width))
 178
 179         ray_mask.blit(radius_mask, (0, 0), None, pgl.BLEND_RGB_MULT)
 180         ray_mask.set_colorkey(black)
 181
 182         light_colour = self.COLOURS[self.colour]
 183         intensity = int(255 * self.intensity)
 184         light_colour = light_colour + (intensity,)
 185
 186         overlay_surf.blit(ray_mask, (0, 0), None)
 187         overlay_surf.fill(light_colour, None, pgl.BLEND_RGBA_MULT)
 188
 189         surface.blit(overlay_surf, (0, 0), None)
 190
 191     def render_fitting(self, surface):
 192         pygame.draw.circle(
 193             surface, (255, 255, 0),
 194             pymunk.pygame_util.to_pygame(self.fitting.offset, surface),
 195             int(self.fitting.radius))
 196
 197
 198 class SpotLight(BaseLight):
 199     def __init__(self, **kw):
 200         kw.pop("direction", None)
 201         kw.pop("spread", None)
 202         super(SpotLight, self).__init__(**kw)