Add filter to obstacle shapes.

[tabakrolletjie.git] / tabakrolletjie / lights.py

diff --git a/tabakrolletjie/lights.py b/tabakrolletjie/lights.py
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..81740d88fd2003603c3332323900d120f3f5d283 100644 (file)
--- a/tabakrolletjie/lights.py
+++ b/tabakrolletjie/lights.py
@@ -0,0 +1,60 @@
+""" May it be a light for you in dark places, when all other lights go out.
+"""
+
+import pymunk
+import pymunk.pygame_util
+import pygame.draw
+
+
+class BaseLight(object):
+    """ Common light functionality. """
+
+    def __init__(self, colour, position):
+        self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
+        self.colour = colour
+        self.position = position
+
+    def add(self, space):
+        if self.body.space is not None:
+            space.remove(self.body, *self.body.shapes)
+        shapes = self.determine_ray_polys(space)
+        space.add(self.body, *shapes)
+
+    def determine_ray_polys(self, space):
+        raise NotImplementedError(
+            "Lights should implement .determine_ray_polys.")
+
+    @classmethod
+    def load(cls, config):
+        kw = config.copy()
+        light_type = kw.pop("type")
+        [light_class] = [
+            c for c in cls.__subclasses__()
+            if c.__name__.lower() == light_type]
+        return light_class(**kw)
+
+
+class SpotLight(BaseLight):
+    def __init__(
+            self, colour="white", position=None, direction=90.0, spread=45.0):
+        super(SpotLight, self).__init__(colour, position)
+        self.direction = direction
+        self.spread = spread
+
+    def determine_ray_polys(self, space):
+        x, y = self.position
+        return [pymunk.Poly(self.body, [
+            self.position, [x + 50, y], [x, y + 50]])]
+
+    def render(self, surface):
+        for shape in self.body.shapes:
+            pygame_poly = [
+                pymunk.pygame_util.to_pygame(v, surface) for v in
+                shape.get_vertices()]
+            pygame.draw.polygon(surface, (255, 255, 255), pygame_poly)
+
+
+class Lamp(BaseLight):
+    def __init__(self, colour="white", position=None, radius=100.0):
+        super(Lamp, self).__init__(colour, position)
+        self.radius = radius