class PhysicsEntity(GameEntity):
# PLEASE NOTE: every PhysicsEntity should be listed in
# game/physics.py ==> physicsEntities
groups = {'all', 'updating', 'game', 'physics'}
mass = 10.
moment = 30. # pymunk.moment_for_poly(mass, verticies)
level = None # The level that contains the physics Space
# this is for the following funciton
specialPolyTypes = {
2 : gl.GL_LINES,
3 : gl.GL_TRIANGLES,
4 : gl.GL_QUADS,
}
# creates a shape for the Entities physics body with the given verticies
def createShape(self, verticies):
assert len(verticies) >= 2
verticies = self.verticies = map(Vec2d, verticies)
if is_clockwise(verticies): # fix it if it is clockwise
average = sum(verticies) / len(verticies)
verticies.sort(key=lambda v: (average-v).get_angle())
assert not is_clockwise(verticies), 'OMG, my code is wrong! the poly points are still clockwise'
assert is_convex(verticies), 'Shape verticies must be convex!'
if len(verticies) in self.specialPolyTypes:
self.polyType = self.specialPolyTypes[len(verticies)]
else:
self.polyType = pg.GL_POLYGON
self.shape = Poly(self.body, verticies)
# note: collisionLayers and collisionType get created by physics.py
self.shape.layers = self.collisionLayers
self.shape.collision_type = self.collisionType
self.shapes = [self.shape]
bb = self.shape.cache_bb()
self.size = Vec2d(bb.right-bb.left, bb.top-bb.bottom)
