tabakrolletjie/obstacles.py

   1 """ Obstacles for light and space mould. """
   2
   3 import pymunk
   4 import pymunk.pygame_util
   5 import pygame.draw
   6
   7 from .constants import OBSTACLE_CATEGORY
   8
   9 OBSTACLE_FILTER = pymunk.ShapeFilter(categories=OBSTACLE_CATEGORY)
  10
  11
  12 class BaseObstacle(object):
  13     def __init__(self):
  14         self.body = pymunk.Body(0, 0, pymunk.body.Body.STATIC)
  15         self.shapes = []
  16
  17     def add(self, space):
  18         if self.body.space is not None:
  19             space.remove(self.body, *self.body.shapes)
  20         for shape in self.shapes:
  21             shape.filter = OBSTACLE_FILTER
  22         space.add(self.body, *self.shapes)
  23
  24     def render(self, surface):
  25         raise NotImplementedError("Obstacles should implement .render().")
  26
  27     @classmethod
  28     def load(cls, config):
  29         kw = config.copy()
  30         obstacle_type = kw.pop("type")
  31         [obstacle_class] = [
  32             c for c in cls.__subclasses__()
  33             if c.__name__.lower() == obstacle_type]
  34         return obstacle_class(**kw)
  35
  36
  37 class Wall(BaseObstacle):
  38
  39     def __init__(self, vertices):
  40         super(Wall, self).__init__()
  41         self.shapes.append(pymunk.Poly(self.body, vertices))
  42
  43     def render(self, surface):
  44         for shape in self.shapes:
  45             pygame_poly = [
  46                 pymunk.pygame_util.to_pygame(v, surface) for v in
  47                 shape.get_vertices()]
  48             pygame.draw.polygon(surface, (0, 0, 0), pygame_poly)