How to use the pymunk.BB function in pymunk

def testCircleBB(self):
        s = p.Space()
        b = p.Body(10,10)
        c = p.Circle(b,5)

        c.cache_bb()

        self.assertEqual(c.bb, p.BB(-5.0, -5.0, 5.0, 5.0))

def testCreation(self):
        bb_empty = p.BB()

        self.assertEqual(bb_empty.left, 0)
        self.assertEqual(bb_empty.bottom, 0)
        self.assertEqual(bb_empty.right, 0)
        self.assertEqual(bb_empty.top , 0)

        bb_defined = p.BB(-10,-5,15,20)

        self.assertEqual(bb_defined.left, -10)
        self.assertEqual(bb_defined.bottom, -5)
        self.assertEqual(bb_defined.right, 15)
        self.assertEqual(bb_defined.top, 20)

        bb_circle = p.BB.newForCircle((3,3),3)
        self.assertEqual(bb_circle.left, 0)
        self.assertEqual(bb_circle.bottom, 0)

def testCreateBox(self):
        c = p.Poly.create_box(None, (4,2), 3)
        self.assertEqual(c.get_vertices(), [(2,-1), (2,1), (-2,1), (-2,-1)])

        c = p.Poly.create_box_bb(None, p.BB(1,2,3,4), 3)
        self.assertEqual(c.get_vertices(), [(3,2), (3,4), (1,4), (1,2)])

def testMerge(self):
        bb1 = p.BB(0,0,10,10)
        bb2 = p.BB(2,0,10,10)
        bb3 = p.BB(10,10,15,15)

        self.assertEqual(bb1.merge(bb2), p.BB(0,0,10,10))
        self.assertEqual(bb2.merge(bb3).merge(bb1), p.BB(0,0,15,15))

def testBB(self):
        c = p.Poly(None, [(2,2),(4,3),(3,5)])
        bb = c.update(p.Transform.identity())
        self.assertEqual(bb, c.bb)
        self.assertEqual(c.bb, p.BB(2, 2, 4, 5))

        b = p.Body(1,2)
        c = p.Poly(b, [(2,2),(4,3),(3,5)])
        c.cache_bb()
        self.assertEqual(c.bb, p.BB(2, 2, 4, 5))

        s = p.Space()
        b = p.Body(1,2)
        c = p.Poly(b, [(2,2),(4,3),(3,5)])
        s.add(b,c)
        self.assertEqual(c.bb, p.BB(2, 2, 4, 5))

def testCircleNoBody(self):
        s = p.Space()
        c = p.Circle(None,5)

        bb = c.update(p.Transform(1, 2, 3, 4, 5, 6))
        self.assertEqual(c.bb, bb)
        self.assertEqual(c.bb, p.BB(0, 1, 10, 11))

v1 = Vec2d(1,1)
        v2 = Vec2d(100,3)
        self.assertTrue(bb1.intersects(bb2))
        self.assertFalse(bb3.intersects(bb2))

        self.assertTrue(bb1.intersects_segment(v1,v2))
        self.assertFalse(bb3.intersects_segment(v1,v2))

        self.assertTrue(bb1.contains(bb3))
        self.assertFalse(bb1.contains(bb2))

        self.assertTrue(bb1.contains_vect(v1))
        self.assertFalse(bb1.contains_vect(v2))

        self.assertEqual(bb1.expand(v1), bb1)
        self.assertEqual(bb1.expand(-v2), p.BB(-100,-3,10,10))

        self.assertEqual(bb1.center(), (5,5))
        self.assertEqual(bb1.area(), 100)

        self.assertEqual(bb1.merged_area(bb2), 400)

        self.assertEqual(bb2.segment_query(v1, v2), p.inf)
        self.assertEqual(bb1.segment_query((-1,1), (99,1)), 0.01)


        self.assertEqual(bb1.clamp_vect(v2), Vec2d(10,3))

def testCreation(self):
        bb_empty = p.BB()
        
        self.assertEqual(bb_empty.left, 0)
        self.assertEqual(bb_empty.bottom, 0)
        self.assertEqual(bb_empty.right, 0)
        self.assertEqual(bb_empty.top , 0)
        
        bb_defined = p.BB(-10,-5,15,20)
        
        self.assertEqual(bb_defined.left, -10)
        self.assertEqual(bb_defined.bottom, -5)
        self.assertEqual(bb_defined.right, 15)
        self.assertEqual(bb_defined.top, 20)

def testMerge(self):
        bb1 = p.BB(0,0,10,10)
        bb2 = p.BB(2,0,10,10)
        bb3 = p.BB(10,10,15,15)

        self.assertEqual(bb1.merge(bb2), p.BB(0,0,10,10))
        self.assertEqual(bb2.merge(bb3).merge(bb1), p.BB(0,0,15,15))

screen = pygame.display.set_mode((690, 300))
clock = pygame.time.Clock() 
    
clock.tick(1/5.)

### Physics stuff
space = pymunk.Space()  
space.gravity = 0, 900
space.sleep_time_threshold = 0.3

draw_options = pymunk.pygame_util.DrawOptions(screen)
pymunk.pygame_util.positive_y_is_up = False

### Generate geometry from pymunk logo image
logo_img = pygame.image.load("pymunk_logo_sphinx.png")
logo_bb = pymunk.BB(0,0,logo_img.get_width(), logo_img.get_height())

def sample_func(point):
    try:
        p = pymunk.pygame_util.to_pygame(point, logo_img)
        color = logo_img.get_at(p)
        
        return color.a
        return color.hsla[2]
    except:
        return 0

line_set = pymunk.autogeometry.PolylineSet()
def segment_func(v0, v1):
        line_set.collect_segment(v0, v1)

logo_img.lock()