tabakrolletjie/lights.py

   1 """ May it be a light for you in dark places, when all other lights go out.
   2 """
   3
   4 import math
   5
   6 import pymunk
   7 import pymunk.pygame_util
   8 import pygame.display
   9 import pygame.draw
  10 import pygame.locals as pgl
  11 import pygame.rect
  12 import pygame.transform
  13
  14 from .constants import LIGHT_CATEGORY, FITTINGS_CATEGORY, COLOURS
  15 from .rays import RayPolyManager
  16 from .utils import DetailedTimer
  17 from .loader import loader
  18 from .transforms import Multiply, MultiplyImage
  19
  20 LIGHT_FILTER = pymunk.ShapeFilter(
  21     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  22         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  23     categories=LIGHT_CATEGORY)
  24
  25 FITTINGS_FILTER = pymunk.ShapeFilter(
  26     mask=pymunk.ShapeFilter.ALL_MASKS ^ (
  27         LIGHT_CATEGORY | FITTINGS_CATEGORY),
  28     categories=FITTINGS_CATEGORY)
  29
  30 # Just match lights, nothing else
  31 LIT_BY_FILTER = pymunk.ShapeFilter(mask=LIGHT_CATEGORY)
  32
  33
  34 class LightManager(object):
  35     """ Manages a set of lights. """
  36
  37     def __init__(self, space, gamestate):
  38         self._space = space
  39         self._lights = [
  40             BaseLight.load(cfg) for cfg in gamestate.station["lights"]]
  41         for light in self._lights:
  42             light.add(self._space)
  43
  44     def add_light(self, cfg):
  45         light = BaseLight.load(cfg)
  46         self._lights.append(light)
  47         light.add(self._space)
  48
  49     def toggle_nearest(self, *args, **kw):
  50         light = self.nearest(*args, **kw)
  51         if light:
  52             light.toggle()
  53
  54     def nearest(self, pos, surfpos=False, max_distance=1.0):
  55         if surfpos:
  56             surface = pygame.display.get_surface()
  57             pos = pymunk.pygame_util.from_pygame(pos, surface)
  58         point_info = self._space.point_query_nearest(
  59             pos, max_distance, pymunk.ShapeFilter(mask=FITTINGS_CATEGORY))
  60         if point_info is not None:
  61             return point_info.shape.body.light
  62         return None
  63
  64     def lit_by(self, pos, surfpos=False, max_distance=0.0):
  65         if surfpos:
  66             surface = pygame.display.get_surface()
  67             pos = pymunk.pygame_util.from_pygame(pos, surface)
  68         point_info_list = self._space.point_query(
  69             pos, max_distance, pymunk.ShapeFilter(mask=LIGHT_CATEGORY))
  70         lights = [p.shape.body.light for p in point_info_list]
  71         return [
  72             light for light in lights
  73             if light.on and light.ray_manager.reaches(pos)
  74         ]
  75
  76     def light_query(self, shape):
  77         """Query the lights by shape"""
  78         old_filter = shape.filter
  79         # We need to restrict matches to only the lights
  80         shape.filter = LIT_BY_FILTER
  81         shape_info_list = self._space.shape_query(shape)
  82         shape.filter = old_filter
  83         lights = [p.shape.body.light for p in shape_info_list]
  84         return [
  85             light for light in lights
  86             if light.on and light.ray_manager.reaches(shape.body.position)
  87         ]
  88
  89     def total_power_usage(self):
  90         return sum(light.power_usage() for light in self._lights)
  91
  92     def render_light(self, surface):
  93         for light in self._lights:
  94             light.render_light(surface)
  95
  96     def render_fittings(self, surface):
  97         for light in self._lights:
  98             light.render_fitting(surface)
  99
 100     def tick(self):
 101         for light in self._lights:
 102             light.tick()
 103
 104
 105 class BaseLight(object):
 106     """ Common light functionality. """
 107
 108     # defaults
 109     RAY_MANAGER = RayPolyManager
 110     FITTING_IMG = None
 111     FITTING_RADIUS = 24.0
 112
 113     # cached surfaces
 114     _surface_cache = {}
 115
 116     def __init__(
 117             self, colours, position, intensity=1.0, radius_limits=None,
 118             direction=None, spread=None):
 119         self.colour_cycle = colours
 120         self.colour_pos = 0
 121         self.colour = colours[0]
 122         self.on = True
 123         self.intensity = intensity
 124         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
 125         self.body.light = self
 126         self.ray_manager = self.RAY_MANAGER(
 127             self.body, position, ray_filter=LIGHT_FILTER,
 128             radius_limits=radius_limits, direction=direction, spread=spread)
 129         self.fitting = pymunk.Circle(
 130             self.body, self.FITTING_RADIUS, self.ray_manager.position)
 131         self.fitting.filter = FITTINGS_FILTER
 132         self._fitting_image = None
 133         self._colour_mult_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 _cached_surface(self, name, surface):
 156         surf = self._surface_cache.get(name)
 157         if surf is None:
 158             surf = self._surface_cache[name] = pygame.surface.Surface(
 159                 surface.get_size(), pgl.SWSURFACE
 160             ).convert_alpha()
 161         return surf
 162
 163     def light_colour(self):
 164         light_colour = COLOURS[self.colour]
 165         intensity = int(255 * self.intensity)
 166         return light_colour + (intensity,)
 167
 168     def render_light(self, surface):
 169         if not self.on:
 170             return
 171
 172         dt = DetailedTimer("render_light")
 173         dt.start()
 174
 175         max_radius = self.ray_manager.max_radius
 176         min_radius = self.ray_manager.min_radius
 177         dest_rect = self.ray_manager.pygame_rect(surface)
 178
 179         white, black = (255, 255, 255, 255), (0, 0, 0, 0)
 180         light_colour = self.light_colour()
 181
 182         radius_mask = self._cached_surface('radius_mask', surface)
 183         radius_mask.set_clip(dest_rect)
 184         ray_mask = self._cached_surface('ray_mask', surface)
 185         ray_mask.set_clip(dest_rect)
 186
 187         ray_mask.fill(black)
 188         for pygame_poly in self.ray_manager.pygame_polys(surface):
 189             pygame.draw.polygon(ray_mask, white, pygame_poly, 0)
 190             pygame.draw.polygon(ray_mask, white, pygame_poly, 1)
 191         dt.lap("ray mask rendered")
 192
 193         radius_mask.fill(black)
 194         centre = self.ray_manager.pygame_position(surface)
 195         pygame.draw.circle(
 196             radius_mask, light_colour, centre, int(max_radius), 0)
 197         pygame.draw.circle(
 198             radius_mask, black, centre, int(min_radius), 0)
 199         dt.lap("radius mask rendered")
 200
 201         ray_mask.blit(radius_mask, dest_rect, dest_rect, pgl.BLEND_RGBA_MULT)
 202         dt.lap("blitted radius mask to ray mask")
 203
 204         surface.blit(ray_mask, dest_rect, dest_rect)
 205         dt.lap("blitted surface")
 206         dt.end()
 207
 208     def fitting_image(self):
 209         if self._fitting_image is None:
 210             fitting_colours = [COLOURS[c] for c in self.colour_cycle]
 211             ncolour = len(fitting_colours)
 212             if ncolour > 3:
 213                 print "Multicoloured light should not have more than 3 colours"
 214                 ncolour = 3
 215
 216             if ncolour == 1:
 217                 self._fitting_image = loader.load_image(
 218                     "48", self.FITTING_IMG,
 219                     transform=Multiply(colour=fitting_colours[0]))
 220             else:
 221                 if self._colour_mult_image is None:
 222                     self._colour_mult_image = pygame.surface.Surface((48, 48))
 223
 224                     for i in range(ncolour):
 225                         sector = loader.load_image(
 226                             "48", "light_mask_%d_%d.png" % (ncolour, i + 1),
 227                             transform=Multiply(colour=fitting_colours[i]))
 228                         self._colour_mult_image.blit(sector, (0, 0), None, 0)
 229
 230                 self._fitting_image = loader.load_image(
 231                     "48", self.FITTING_IMG,
 232                     transform=MultiplyImage(image=self._colour_mult_image))
 233
 234         return self._fitting_image
 235
 236     def invalidate_fitting_image(self):
 237         self._fitting_image = None
 238
 239     def render_fitting(self, surface):
 240         rx, ry = self.ray_manager.pygame_position(surface)
 241         surface.blit(self.fitting_image(), (rx - 24, ry - 24), None, 0)
 242
 243     def power_usage(self):
 244         if not self.on:
 245             return 0.0
 246         area = math.pi * (self.ray_manager.max_radius ** 2)  # radius
 247         area = area * (self.ray_manager.spread / (2 * math.pi))  # spread
 248         return 5 * area * self.intensity / 6400  # 80x80 unit area
 249
 250     def base_damage(self):
 251         return 5 * self.intensity
 252
 253     def toggle(self):
 254         self.colour_pos += 1
 255         if self.colour_pos >= len(self.colour_cycle):
 256             self.colour = self.colour_cycle[0]
 257             self.colour_pos = -1
 258             self.on = False
 259         else:
 260             self.colour = self.colour_cycle[self.colour_pos]
 261             self.on = True
 262
 263     def tick(self):
 264         pass
 265
 266
 267 class Lamp(BaseLight):
 268
 269     FITTING_IMG = "lamp.png"
 270
 271
 272 class PulsatingLamp(BaseLight):
 273
 274     FITTING_IMG = "lamp.png"
 275     DEFAULT_PULSE_RANGE = (20, 100)
 276     DEFAULT_PULSE_VELOCITY = 2
 277     DEFAULT_INTENSITY_RANGE = (0.0, 0.9)
 278     DEFAULT_INTENSITY_VELOCITY = 0.1
 279
 280     def __init__(self, **kw):
 281         self.pulse_range = kw.pop("pulse_range", self.DEFAULT_PULSE_RANGE)
 282         self.pulse_velocity = kw.pop(
 283             "pulse_velocity", self.DEFAULT_PULSE_VELOCITY)
 284         self.intensity_range = kw.pop(
 285             "intensity_range", self.DEFAULT_INTENSITY_RANGE)
 286         self.intensity_velocity = kw.pop(
 287             "intensity_velocity", self.DEFAULT_INTENSITY_VELOCITY)
 288         super(PulsatingLamp, self).__init__(**kw)
 289
 290     def _update_range(self, value, velocity, value_range):
 291         value += velocity
 292         if value < value_range[0]:
 293             value = value_range[0]
 294             velocity = -velocity
 295         elif value > value_range[1]:
 296             value = value_range[1]
 297             velocity = -velocity
 298         return value, velocity
 299
 300     def tick(self):
 301         self.ray_manager.max_radius, self.pulse_velocity = self._update_range(
 302             self.ray_manager.max_radius, self.pulse_velocity, self.pulse_range)
 303         self.intensity, self.intensity_velocity = self._update_range(
 304             self.intensity, self.intensity_velocity, self.intensity_range)
 305
 306
 307 class SpotLight(BaseLight):
 308
 309     FITTING_IMG = "spotlight.png"
 310
 311     def __init__(self, **kw):
 312         self.angular_velocity = kw.pop("angular_velocity", None)
 313         super(SpotLight, self).__init__(**kw)
 314
 315     def fitting_image(self):
 316         fitting_image = super(SpotLight, self).fitting_image()
 317         rot_fitting_image = pygame.transform.rotozoom(fitting_image, self.ray_manager.direction - 90, 1)
 318
 319         rot_rect = fitting_image.get_rect().copy()
 320         rot_rect.center = rot_fitting_image.get_rect().center
 321         rot_fitting_image = rot_fitting_image.subsurface(rot_rect).copy()
 322
 323         return rot_fitting_image
 324
 325
 326     def tick(self):
 327         if self.angular_velocity:
 328             self.ray_manager.direction -= self.angular_velocity
 329             self.ray_manager.update_shapes()