# 2D Joints

Pendulum chain with PinJoint2D constraints.

```{raw} html
<a class="example-run-button" href="../demos/features_2d_joints.html">▶ Run in browser</a>

```

**Tags:** `2d`

Demonstrates:
  - RigidBody2D physics bodies with automatic gravity
  - StaticBody2D as a fixed anchor point
  - PinJoint2D connecting bodies with Baumgarte-stabilized distance constraints
  - PhysicsServer handles all constraint solving automatically
  - Click-to-apply-force interaction on the bottom ball

Controls:
  LMB   - Apply impulse to the bottom ball
  R     - Reset the chain
  ESC   - Quit

Run: uv run python examples/features/2d/joints.py

## Source

```{literalinclude} ../../examples/features/2d/joints.py
:language: python
:linenos:
```