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 add_light(self, cfg):
  42         light = BaseLight.load(cfg)
  43         self._lights.append(light)
  44         light.add(self._space)
  45
  46     def toggle_nearest(self, *args, **kw):
  47         light = self.nearest(*args, **kw)
  48         if light:
  49             light.toggle()
  50
  51     def nearest(self, pos, surfpos=False, max_distance=1.0):
  52         if surfpos:
  53             surface = pygame.display.get_surface()
  54             pos = pymunk.pygame_util.from_pygame(pos, surface)
  55         point_info = self._space.point_query_nearest(
  56             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  57         if point_info is not None:
  58             return point_info.shape.body.light
  59         return None
  60
  61     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  62         if surfpos:
  63             surface = pygame.display.get_surface()
  64             pos = pymunk.pygame_util.from_pygame(pos, surface)
  65         point_info_list = self._space.point_query(
  66             pos, max_distance, pymunk.ShapeFilter(mask=LIGHT_CATEGORY))
  67         lights = [p.shape.body.light for p in point_info_list]
  68         return [light for light in lights if light.on]
  69
  70     def light_query(self, shape):
  71         """Query the lights by shape"""
  72         old_filter = shape.filter
  73         # We need to restrict matches to only the lights
  74         shape.filter = LIT_BY_FILTER
  75         shape_info_list = self._space.shape_query(shape)
  76         shape.filter = old_filter
  77         lights = [p.shape.body.light for p in shape_info_list]
  78         return [light for light in lights if light.on]
  79
  80     def render_light(self, surface):
  81         for light in self._lights:
  82             light.render_light(surface)
  83
  84     def render_fittings(self, surface):
  85         for light in self._lights:
  86             light.render_fitting(surface)
  87
  88     def tick(self):
  89         for light in self._lights:
  90             light.tick()
  91
  92
  93 class BaseLight(object):
  94     """ Common light functionality. """
  95
  96     COLOURS = {
  97         "red": (255, 0, 0),
  98         "green": (0, 255, 0),
  99         "blue": (0, 255, 255),
 100         "yellow": (255, 255, 0),
 101         "white": (255, 255, 255),
 102     }
 103
 104     FITTING_IMG = None
 105
 106     # cached surfaces
 107     _surface_cache = {}
 108
 109     def __init__(
 110             self, colour, position, intensity=1.0,
 111             radius_limits=(None, None), angle_limits=None):
 112         self.colour = colour
 113         self.position = pymunk.Vec2d(position)
 114         self.on = True
 115         self.intensity = intensity
 116         self.radius_limits = radius_limits
 117         self.angle_limits = angle_limits
 118         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 119         self.fitting = pymunk.Circle(self.body, 10.0, self.position)
 120         self.fitting.filter = FITTINGS_FILTER
 121         self.body.light = self
 122         self.ray_manager = RayPolyManager(self.body, LIGHT_FILTER)
 123         self._image = None
 124
 125     @classmethod
 126     def load(cls, config):
 127         kw = config.copy()
 128         light_type = kw.pop("type")
 129         [light_class] = [
 130             c for c in cls.__subclasses__()
 131             if c.__name__.lower() == light_type]
 132         return light_class(**kw)
 133
 134     def add(self, space):
 135         if self.body.space is not None:
 136             space.remove(self.body, *self.body.shapes)
 137         self.ray_manager.generate_rays(space, self.position)
 138         self.ray_manager.set_angle_limits(self.angle_limits)
 139         ray_shapes = self.ray_manager.polys()
 140         space.add(self.body, self.fitting, *ray_shapes)
 141
 142     def shapes_for_ray_polys(self, ray_polys):
 143         return ray_polys
 144
 145     def toggle(self):
 146         self.on = not self.on
 147
 148     def _cached_surfaces(self, surface):
 149         radius_mask = self._surface_cache.get('radius_mask')
 150         if radius_mask is None:
 151             radius_mask = self._surface_cache['radius_mask'] = (
 152                 pygame.surface.Surface(
 153                     surface.get_size(), pgl.SWSURFACE)).convert_alpha()
 154
 155         ray_mask = self._surface_cache.get('ray_mask')
 156         if ray_mask is None:
 157             ray_mask = self._surface_cache['ray_mask'] = (
 158                 pygame.surface.Surface(
 159                     surface.get_size(), pgl.SWSURFACE)).convert_alpha()
 160
 161         return radius_mask, ray_mask
 162
 163     def render_light(self, surface):
 164         if not self.on:
 165             return
 166
 167         dt = DetailedTimer("render_light")
 168         dt.start()
 169         dt.show("%s, %s" % (self.ray_manager._start, self.ray_manager._end))
 170
 171         max_radius = self.radius_limits[1] or 50.0
 172         min_radius = self.radius_limits[0] or 0
 173
 174         rw = max_radius * 2
 175         rx, ry = pymunk.pygame_util.to_pygame(self.position, surface)
 176         dest_rect = pygame.rect.Rect(rx, ry, rw, rw)
 177         dest_rect.move_ip(- max_radius, - max_radius)
 178
 179         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 180
 181         radius_mask, ray_mask = self._cached_surfaces(surface)
 182         radius_mask.set_clip(dest_rect)
 183         ray_mask.set_clip(dest_rect)
 184
 185         ray_mask.fill(black)
 186         for pygame_poly in self.ray_manager.pygame_polys(surface):
 187             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 188             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 189         dt.lap("ray mask rendered")
 190
 191         light_colour = self.COLOURS[self.colour]
 192         intensity = int(255 * self.intensity)
 193         light_colour = light_colour + (intensity,)
 194
 195         radius_mask.fill(black)
 196         centre = pymunk.pygame_util.to_pygame(self.position, surface)
 197         pygame.draw.circle(
 198             radius_mask, light_colour, centre, int(max_radius), 0)
 199         pygame.draw.circle(
 200             radius_mask, black, centre, int(min_radius), 0)
 201         dt.lap("radius mask rendered")
 202
 203         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 204         dt.lap("blitted radius mask to ray mask")
 205
 206         surface.blit(ray_mask, dest_rect, dest_rect)
 207         dt.lap("blitted surface")
 208         dt.end()
 209
 210     def get_image(self):
 211         if self._image is None:
 212             fitting_colour = self.COLOURS[self.colour]
 213             self._image = loader.load_image(
 214                 "48", self.FITTING_IMG,
 215                 transform=Multiply(colour=fitting_colour))
 216         return self._image
 217
 218     def render_fitting(self, surface):
 219         rx, ry = pymunk.pygame_util.to_pygame(self.position, surface)
 220         surface.blit(self.get_image(), (rx - 24, ry - 24), None, 0)
 221
 222     def tick(self):
 223         pass
 224
 225
 226 class Lamp(BaseLight):
 227     FITTING_IMG = "lamp.png"
 228
 229     def __init__(self, **kw):
 230         kw.pop("direction", None)
 231         kw.pop("spread", None)
 232         super(Lamp, self).__init__(**kw)
 233
 234
 235 class SpotLight(BaseLight):
 236     FITTING_IMG = "spotlight.png"
 237
 238     def __init__(self, **kw):
 239         kw.pop("direction", None)
 240         kw.pop("spread", None)
 241         self.angular_velocity = kw.pop("angular_velocity", None)
 242         super(SpotLight, self).__init__(**kw)
 243
 244     def tick(self):
 245         if self.angular_velocity:
 246             start, end = self.angle_limits
 247             start = (start + self.angular_velocity) % 360.0
 248             end = (end + self.angular_velocity) % 360.0
 249             self.angle_limits = (start, end)
 250             self.ray_manager.set_angle_limits(self.angle_limits)