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
  15 LIGHT_FILTER = pymunk.ShapeFilter(
  16     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  17         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  18     categories=LIGHT_CATEGORY)
  19
  20 FITTINGS_FILTER = pymunk.ShapeFilter(
  21     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  22         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  23     categories=FITTINGS_CATEGORY)
  24
  25 # Just match lights, nothing else
  26 LIT_BY_FILTER = pymunk.ShapeFilter(mask=LIGHT_CATEGORY)
  27
  28
  29 class LightManager(object):
  30     """ Manages a set of lights. """
  31
  32     def __init__(self, space, gamestate):
  33         self._space = space
  34         self._lights = [
  35             BaseLight.load(cfg) for cfg in gamestate.station["lights"]]
  36         for light in self._lights:
  37             light.add(self._space)
  38
  39     def toggle_nearest(self, *args, **kw):
  40         light = self.nearest(*args, **kw)
  41         if light:
  42             light.toggle()
  43
  44     def nearest(self, pos, surfpos=False, max_distance=1.0):
  45         if surfpos:
  46             surface = pygame.display.get_surface()
  47             pos = pymunk.pygame_util.from_pygame(pos, surface)
  48         point_info = self._space.point_query_nearest(
  49             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  50         if point_info is not None:
  51             return point_info.shape.body.light
  52         return None
  53
  54     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  55         if surfpos:
  56             surface = pygame.display.get_surface()
  57             pos = pymunk.pygame_util.from_pygame(pos, surface)
  58         point_info_list = self._space.point_query(
  59             pos, max_distance, pymunk.ShapeFilter(mask=LIGHT_CATEGORY))
  60         lights = [p.shape.body.light for p in point_info_list]
  61         return [light for light in lights if light.on]
  62
  63     def light_query(self, shape):
  64         """Query the lights by shape"""
  65         old_filter = shape.filter
  66         # We need to restrict matches to only the lights
  67         shape.filter = LIT_BY_FILTER
  68         shape_info_list = self._space.shape_query(shape)
  69         shape.filter = old_filter
  70         lights = [p.shape.body.light for p in shape_info_list]
  71         return [light for light in lights if light.on]
  72
  73     def render_light(self, surface):
  74         for light in self._lights:
  75             light.render_light(surface)
  76
  77     def render_fittings(self, surface):
  78         for light in self._lights:
  79             light.render_fitting(surface)
  80
  81     def tick(self):
  82         for light in self._lights:
  83             light.tick()
  84
  85
  86 class BaseLight(object):
  87     """ Common light functionality. """
  88
  89     COLOURS = {
  90         "red": (255, 0, 0),
  91         "green": (0, 255, 0),
  92         "blue": (0, 255, 255),
  93         "yellow": (255, 255, 0),
  94         "white": (255, 255, 255),
  95     }
  96
  97     # cached surfaces
  98     _surface_cache = {}
  99
 100     def __init__(
 101             self, colour, position, intensity=1.0,
 102             radius_limits=(None, None), angle_limits=None):
 103         self.colour = colour
 104         self.position = pymunk.Vec2d(position)
 105         self.on = True
 106         self.intensity = intensity
 107         self.radius_limits = radius_limits
 108         self.angle_limits = angle_limits
 109         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 110         self.fitting = pymunk.Circle(self.body, 10.0, self.position)
 111         self.fitting.filter = FITTINGS_FILTER
 112         self.body.light = self
 113         self.ray_manager = RayPolyManager(self.body, LIGHT_FILTER)
 114
 115     @classmethod
 116     def load(cls, config):
 117         kw = config.copy()
 118         light_type = kw.pop("type")
 119         [light_class] = [
 120             c for c in cls.__subclasses__()
 121             if c.__name__.lower() == light_type]
 122         return light_class(**kw)
 123
 124     def add(self, space):
 125         if self.body.space is not None:
 126             space.remove(self.body, *self.body.shapes)
 127         self.ray_manager.generate_rays(space, self.position)
 128         self.ray_manager.set_angle_limits(self.angle_limits)
 129         ray_shapes = self.ray_manager.polys()
 130         space.add(self.body, self.fitting, *ray_shapes)
 131
 132     def shapes_for_ray_polys(self, ray_polys):
 133         return ray_polys
 134
 135     def toggle(self):
 136         self.on = not self.on
 137
 138     def _cached_surfaces(self, surface):
 139         radius_mask = self._surface_cache.get('radius_mask')
 140         if radius_mask is None:
 141             radius_mask = self._surface_cache['radius_mask'] = (
 142                 pygame.surface.Surface(
 143                     surface.get_size(), pgl.SWSURFACE)).convert_alpha()
 144
 145         ray_mask = self._surface_cache.get('ray_mask')
 146         if ray_mask is None:
 147             ray_mask = self._surface_cache['ray_mask'] = (
 148                 pygame.surface.Surface(
 149                     surface.get_size(), pgl.SWSURFACE)).convert_alpha()
 150
 151         return radius_mask, ray_mask
 152
 153     def render_light(self, surface):
 154         if not self.on:
 155             return
 156
 157         dt = DetailedTimer("render_light", debug=True)
 158         dt.start()
 159         dt.show("%s, %s" % (self.ray_manager._start, self.ray_manager._end))
 160
 161         max_radius = self.radius_limits[1] or 50.0
 162         min_radius = self.radius_limits[0] or 0
 163
 164         rw = max_radius * 2
 165         rx, ry = pymunk.pygame_util.to_pygame(self.position, surface)
 166         dest_rect = pygame.rect.Rect(rx, ry, rw, rw)
 167         dest_rect.move_ip(- max_radius, - max_radius)
 168
 169         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 170
 171         radius_mask, ray_mask = self._cached_surfaces(surface)
 172         radius_mask.set_clip(dest_rect)
 173         ray_mask.set_clip(dest_rect)
 174
 175         ray_mask.fill(black)
 176         for pygame_poly in self.ray_manager.pygame_polys(surface):
 177             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 178             pygame.draw.aalines(ray_mask, white, True, pygame_poly, 1)
 179         dt.lap("ray mask rendered")
 180
 181         radius_mask.fill(black)
 182         centre = pymunk.pygame_util.to_pygame(self.position, surface)
 183         pygame.draw.circle(
 184             radius_mask, white, centre, int(max_radius), 0)
 185         pygame.draw.circle(
 186             radius_mask, black, centre, int(min_radius), 0)
 187         dt.lap("radius mask rendered")
 188
 189         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 190         dt.lap("blitted radius mask to ray mask")
 191
 192         light_colour = self.COLOURS[self.colour]
 193         intensity = int(255 * self.intensity)
 194         light_colour = light_colour + (intensity,)
 195
 196         ray_mask.fill(light_colour, dest_rect, pgl.BLEND_RGBA_MULT)
 197         dt.lap("coloured ray mask")
 198
 199         surface.blit(ray_mask, dest_rect, dest_rect)
 200         dt.lap("blitted surface")
 201         dt.end()
 202
 203     def render_fitting(self, surface):
 204         pygame.draw.circle(
 205             surface, (255, 255, 0),
 206             pymunk.pygame_util.to_pygame(self.fitting.offset, surface),
 207             int(self.fitting.radius))
 208
 209     def tick(self):
 210         pass
 211
 212
 213 class SpotLight(BaseLight):
 214     def __init__(self, **kw):
 215         kw.pop("direction", None)
 216         kw.pop("spread", None)
 217         self.angular_velocity = kw.pop("angular_velocity", None)
 218         super(SpotLight, self).__init__(**kw)
 219
 220     def tick(self):
 221         if self.angular_velocity:
 222             start, end = self.angle_limits
 223             start = (start + self.angular_velocity) % 360.0
 224             end = (end + self.angular_velocity) % 360.0
 225             self.angle_limits = (start, end)
 226             self.ray_manager.set_angle_limits(self.angle_limits)