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 [
  69             light for light in lights
  70             if light.on and light.ray_manager.reaches(pos)
  71         ]
  72
  73     def light_query(self, shape):
  74         """Query the lights by shape"""
  75         old_filter = shape.filter
  76         # We need to restrict matches to only the lights
  77         shape.filter = LIT_BY_FILTER
  78         shape_info_list = self._space.shape_query(shape)
  79         shape.filter = old_filter
  80         lights = [p.shape.body.light for p in shape_info_list]
  81         return [
  82             light for light in lights
  83             if light.on and light.ray_manager.reaches(shape.body.position)
  84         ]
  85
  86     def render_light(self, surface):
  87         for light in self._lights:
  88             light.render_light(surface)
  89
  90     def render_fittings(self, surface):
  91         for light in self._lights:
  92             light.render_fitting(surface)
  93
  94     def tick(self):
  95         for light in self._lights:
  96             light.tick()
  97
  98
  99 class BaseLight(object):
 100     """ Common light functionality. """
 101
 102     COLOURS = {
 103         "red": (255, 0, 0),
 104         "green": (0, 255, 0),
 105         "blue": (0, 0, 255),
 106         "cyan": (0, 255, 255),
 107         "yellow": (255, 255, 0),
 108         "white": (255, 255, 255),
 109     }
 110
 111     # defaults
 112     RAY_MANAGER = RayPolyManager
 113     FITTING_IMG = None
 114     FITTING_RADIUS = 24.0
 115
 116     # cached surfaces
 117     _surface_cache = {}
 118
 119     def __init__(
 120             self, colour, position, intensity=1.0, radius_limits=None,
 121             angle_limits=None):
 122         self.colour = colour
 123         self.on = True
 124         self.intensity = intensity
 125         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 126         self.body.light = self
 127         self.ray_manager = self.RAY_MANAGER(
 128             self.body, position, ray_filter=LIGHT_FILTER,
 129             radius_limits=radius_limits, angle_limits=angle_limits)
 130         self.fitting = pymunk.Circle(
 131             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 132         self.fitting.filter = FITTINGS_FILTER
 133         self._image = None
 134
 135     @property
 136     def position(self):
 137         return self.ray_manager.position
 138
 139     @classmethod
 140     def load(cls, config):
 141         kw = config.copy()
 142         light_type = kw.pop("type")
 143         [light_class] = [
 144             c for c in cls.__subclasses__()
 145             if c.__name__.lower() == light_type]
 146         return light_class(**kw)
 147
 148     def add(self, space):
 149         if self.body.space is not None:
 150             space.remove(self.body, *self.body.shapes)
 151         space.add(self.body, self.fitting)
 152         self.ray_manager.set_space(space)
 153         self.ray_manager.update_shapes()
 154
 155     def toggle(self):
 156         self.on = not self.on
 157
 158     def _cached_surface(self, name, surface):
 159         surf = self._surface_cache.get(name)
 160         if surf is None:
 161             surf = self._surface_cache[name] = pygame.surface.Surface(
 162                 surface.get_size(), pgl.SWSURFACE
 163             ).convert_alpha()
 164         return surf
 165
 166     def light_colour(self):
 167         light_colour = self.COLOURS[self.colour]
 168         intensity = int(255 * self.intensity)
 169         return light_colour + (intensity,)
 170
 171     def render_light(self, surface):
 172         if not self.on:
 173             return
 174
 175         dt = DetailedTimer("render_light")
 176         dt.start()
 177
 178         max_radius = self.ray_manager.max_radius
 179         min_radius = self.ray_manager.min_radius
 180         dest_rect = self.ray_manager.pygame_rect(surface)
 181
 182         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 183         light_colour = self.light_colour()
 184
 185         radius_mask = self._cached_surface('radius_mask', surface)
 186         radius_mask.set_clip(dest_rect)
 187         ray_mask = self._cached_surface('ray_mask', surface)
 188         ray_mask.set_clip(dest_rect)
 189
 190         ray_mask.fill(black)
 191         for pygame_poly in self.ray_manager.pygame_polys(surface):
 192             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 193             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 194         dt.lap("ray mask rendered")
 195
 196         radius_mask.fill(black)
 197         centre = self.ray_manager.pygame_position(surface)
 198         pygame.draw.circle(
 199             radius_mask, light_colour, centre, int(max_radius), 0)
 200         pygame.draw.circle(
 201             radius_mask, black, centre, int(min_radius), 0)
 202         dt.lap("radius mask rendered")
 203
 204         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 205         dt.lap("blitted radius mask to ray mask")
 206
 207         surface.blit(ray_mask, dest_rect, dest_rect)
 208         dt.lap("blitted surface")
 209         dt.end()
 210
 211     def get_image(self):
 212         if self._image is None:
 213             fitting_colour = self.COLOURS[self.colour]
 214             self._image = loader.load_image(
 215                 "48", self.FITTING_IMG,
 216                 transform=Multiply(colour=fitting_colour))
 217         return self._image
 218
 219     def render_fitting(self, surface):
 220         rx, ry = self.ray_manager.pygame_position(surface)
 221         surface.blit(self.get_image(), (rx - 24, ry - 24), None, 0)
 222
 223     def tick(self):
 224         pass
 225
 226
 227 class Lamp(BaseLight):
 228     FITTING_IMG = "lamp.png"
 229
 230
 231 class SpotLight(BaseLight):
 232     FITTING_IMG = "spotlight.png"
 233
 234     def __init__(self, **kw):
 235         self.angular_velocity = kw.pop("angular_velocity", None)
 236         super(SpotLight, self).__init__(**kw)
 237
 238     def tick(self):
 239         if self.angular_velocity:
 240             self.ray_manager.rotate_degrees(self.angular_velocity)
 241             self.ray_manager.update_shapes()