Revolute Joint

Create revolute joints Uses:

• b2d.RevoluteJointDef

• b2d.RevoluteJoint

Imports

pyb2d is imported as b2d

import b2d
import numpy as np

These imports are only needed for plotting. b2d.plot requires OpenCV to be installed!

import b2d.plot
import matplotlib.pyplot as plt

revolute joints

world = b2d.world(gravity=(0, -10))
bodies = []
b = world.create_static_body(position=(0, 15))
bodies.append(b)
for i in range(5):
    b = world.create_dynamic_body(
        position=(i * 4 + 2, 15),
        fixtures=b2d.fixture_def(shape=b2d.polygon_shape(box=[2, 0.5]), density=1),
        linear_damping=0.0,
        angular_damping=0.0,
    )
    bodies.append(b)
world.create_revolute_joint(
    bodies[0], bodies[1], local_anchor_a=(0, 0), local_anchor_b=(-2, 0.0)
)
for i in range(1, len(bodies) - 1):
    a = bodies[i]
    b = bodies[i + 1]
    world.create_revolute_joint(a, b, local_anchor_a=(2, 0.0), local_anchor_b=(-2, 0.0))


fig, ax, ani = b2d.plot.animate_world(world, world_margin=(20, 20))
ani
plt.show()

Once Loop Reflect

/home/runner/.local/lib/python3.10/site-packages/b2d/plot.py:128: UserWarning: You passed in an explicit save_count=73 which is being ignored in favor of frames=73.
  ani = animation.FuncAnimation(