def demo_2() -> World:
world = World(gravity=GRAVITY, iterations=IMPULSE_ITERATIONS)
body_1 = Body([100.0, 10.0])
body_1.position = np.array([0.0, 0.5 * body_1.width[1]])
body_1.friction = 0.2
body_1.rotation = 0.0
world.add_body(body_1)
body_2 = Body([5.0, 5.0], 100.0)
body_2.position = np.array([45.0, 60.0])
body_2.friction = 0.2
body_2.rotation = 0.0
world.add_body(body_2)
joint = Joint(body_1, body_2, body_2.position * [0, 1])
world.add_joint(joint)
return world
def demo_4() -> World:
world = World(gravity=GRAVITY, iterations=IMPULSE_ITERATIONS)
body_1 = Body([100.0, 10.0])
body_1.position = np.array([0.0, 0.5 * body_1.width[1]])
world.add_body(body_1)
for i in range(8):
body = Body([3.0, 3.0], 1.0)
body.friction = 0.2
x = np.random.rand() - 0.5
body.position = np.array([x, 12.0 + 3.5 * i])
world.add_body(body)
return world
def demo_3() -> World:
world = World(gravity=GRAVITY, iterations=IMPULSE_ITERATIONS)
body_1 = Body([100.0, 1.0])
body_1.position = np.array([0.0, 20.0])
body_1.rotation = -0.25
world.add_body(body_1)
frictions = [0.75, 0.5, 0.35, 0.1, 0.0]
for i, fric in enumerate(frictions):
body = Body([3.0, 3.0], 25.0)
body.friction = fric
body.position = np.array([-45.0 + 10.0 * i, 40.0])
world.add_body(body)
return world