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
  16 LIGHT_FILTER = pymunk.ShapeFilter(
  17     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  18         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  19     categories=LIGHT_CATEGORY)
  20
  21 FITTINGS_FILTER = pymunk.ShapeFilter(
  22     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  23         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  24     categories=FITTINGS_CATEGORY)
  25
  26 # Just match lights, nothing else
  27 LIT_BY_FILTER = pymunk.ShapeFilter(mask=LIGHT_CATEGORY)
  28
  29
  30 class LightManager(object):
  31     """ Manages a set of lights. """
  32
  33     def __init__(self, space, gamestate):
  34         self._space = space
  35         self._lights = [
  36             BaseLight.load(cfg) for cfg in gamestate.station["lights"]]
  37         for light in self._lights:
  38             light.add(self._space)
  39
  40     def toggle_nearest(self, *args, **kw):
  41         light = self.nearest(*args, **kw)
  42         if light:
  43             light.toggle()
  44
  45     def nearest(self, pos, surfpos=False, max_distance=1.0):
  46         if surfpos:
  47             surface = pygame.display.get_surface()
  48             pos = pymunk.pygame_util.from_pygame(pos, surface)
  49         point_info = self._space.point_query_nearest(
  50             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  51         if point_info is not None:
  52             return point_info.shape.body.light
  53         return None
  54
  55     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  56         if surfpos:
  57             surface = pygame.display.get_surface()
  58             pos = pymunk.pygame_util.from_pygame(pos, surface)
  59         point_info_list = self._space.point_query(
  60             pos, max_distance, pymunk.ShapeFilter(mask=LIGHT_CATEGORY))
  61         lights = [p.shape.body.light for p in point_info_list]
  62         return [light for light in lights if light.on]
  63
  64     def light_query(self, shape):
  65         """Query the lights by shape"""
  66         old_filter = shape.filter
  67         # We need to restrict matches to only the lights
  68         shape.filter = LIT_BY_FILTER
  69         shape_info_list = self._space.shape_query(shape)
  70         shape.filter = old_filter
  71         lights = [p.shape.body.light for p in shape_info_list]
  72         return [light for light in lights if light.on]
  73
  74     def render_light(self, surface):
  75         for light in self._lights:
  76             light.render_light(surface)
  77
  78     def render_fittings(self, surface):
  79         for light in self._lights:
  80             light.render_fitting(surface)
  81
  82     def tick(self):
  83         for light in self._lights:
  84             light.tick()
  85
  86
  87 class BaseLight(object):
  88     """ Common light functionality. """
  89
  90     COLOURS = {
  91         "red": (255, 0, 0),
  92         "green": (0, 255, 0),
  93         "blue": (0, 255, 255),
  94         "yellow": (255, 255, 0),
  95         "white": (255, 255, 255),
  96     }
  97
  98     FITTING_IMG = None
  99
 100     # cached surfaces
 101     _surface_cache = {}
 102
 103     def __init__(
 104             self, colour, position, intensity=1.0,
 105             radius_limits=(None, None), angle_limits=None):
 106         self.colour = colour
 107         self.position = pymunk.Vec2d(position)
 108         self.on = True
 109         self.intensity = intensity
 110         self.radius_limits = radius_limits
 111         self.angle_limits = angle_limits
 112         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 113         self.fitting = pymunk.Circle(self.body, 10.0, self.position)
 114         self.fitting.filter = FITTINGS_FILTER
 115         self.body.light = self
 116         self.ray_manager = RayPolyManager(self.body, LIGHT_FILTER)
 117         self._image = None
 118
 119     @classmethod
 120     def load(cls, config):
 121         kw = config.copy()
 122         light_type = kw.pop("type")
 123         [light_class] = [
 124             c for c in cls.__subclasses__()
 125             if c.__name__.lower() == light_type]
 126         return light_class(**kw)
 127
 128     def add(self, space):
 129         if self.body.space is not None:
 130             space.remove(self.body, *self.body.shapes)
 131         self.ray_manager.generate_rays(space, self.position)
 132         self.ray_manager.set_angle_limits(self.angle_limits)
 133         ray_shapes = self.ray_manager.polys()
 134         space.add(self.body, self.fitting, *ray_shapes)
 135
 136     def shapes_for_ray_polys(self, ray_polys):
 137         return ray_polys
 138
 139     def toggle(self):
 140         self.on = not self.on
 141
 142     def _cached_surfaces(self, surface):
 143         radius_mask = self._surface_cache.get('radius_mask')
 144         if radius_mask is None:
 145             radius_mask = self._surface_cache['radius_mask'] = (
 146                 pygame.surface.Surface(
 147                     surface.get_size(), pgl.SWSURFACE)).convert_alpha()
 148
 149         ray_mask = self._surface_cache.get('ray_mask')
 150         if ray_mask is None:
 151             ray_mask = self._surface_cache['ray_mask'] = (
 152                 pygame.surface.Surface(
 153                     surface.get_size(), pgl.SWSURFACE)).convert_alpha()
 154
 155         return radius_mask, ray_mask
 156
 157     def render_light(self, surface):
 158         if not self.on:
 159             return
 160
 161         dt = DetailedTimer("render_light")
 162         dt.start()
 163         dt.show("%s, %s" % (self.ray_manager._start, self.ray_manager._end))
 164
 165         max_radius = self.radius_limits[1] or 50.0
 166         min_radius = self.radius_limits[0] or 0
 167
 168         rw = max_radius * 2
 169         rx, ry = pymunk.pygame_util.to_pygame(self.position, surface)
 170         dest_rect = pygame.rect.Rect(rx, ry, rw, rw)
 171         dest_rect.move_ip(- max_radius, - max_radius)
 172
 173         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 174
 175         radius_mask, ray_mask = self._cached_surfaces(surface)
 176         radius_mask.set_clip(dest_rect)
 177         ray_mask.set_clip(dest_rect)
 178
 179         ray_mask.fill(black)
 180         for pygame_poly in self.ray_manager.pygame_polys(surface):
 181             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 182             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 183         dt.lap("ray mask rendered")
 184
 185         light_colour = self.COLOURS[self.colour]
 186         intensity = int(255 * self.intensity)
 187         light_colour = light_colour + (intensity,)
 188
 189         radius_mask.fill(black)
 190         centre = pymunk.pygame_util.to_pygame(self.position, surface)
 191         pygame.draw.circle(
 192             radius_mask, light_colour, centre, int(max_radius), 0)
 193         pygame.draw.circle(
 194             radius_mask, black, centre, int(min_radius), 0)
 195         dt.lap("radius mask rendered")
 196
 197         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 198         dt.lap("blitted radius mask to ray mask")
 199
 200         surface.blit(ray_mask, dest_rect, dest_rect)
 201         dt.lap("blitted surface")
 202         dt.end()
 203
 204     def get_image(self):
 205         if self._image is None:
 206             self._image = loader.load_image("64", self.FITTING_IMG).copy()
 207             fitting_colour = self.COLOURS[self.colour]
 208             self._image.fill(fitting_colour, None, pgl.BLEND_RGBA_MULT)
 209         return self._image
 210
 211     def render_fitting(self, surface):
 212         rx, ry = pymunk.pygame_util.to_pygame(self.position, surface)
 213         surface.blit(self.get_image(), (rx - 32, ry - 32), None, 0)
 214
 215     def tick(self):
 216         pass
 217
 218
 219 class SpotLight(BaseLight):
 220     FITTING_IMG = "spotlight.png"
 221
 222     def __init__(self, **kw):
 223         kw.pop("direction", None)
 224         kw.pop("spread", None)
 225         self.angular_velocity = kw.pop("angular_velocity", None)
 226         super(SpotLight, self).__init__(**kw)
 227
 228     def tick(self):
 229         if self.angular_velocity:
 230             start, end = self.angle_limits
 231             start = (start + self.angular_velocity) % 360.0
 232             end = (end + self.angular_velocity) % 360.0
 233             self.angle_limits = (start, end)
 234             self.ray_manager.set_angle_limits(self.angle_limits)