Version 0.2

• Add a seesaw to the middle of the screen.
• Show the line of the pendulum.
• Show instructions on the screen.
• Add slow motion key.
• Add clear screen key.
• Add rotation control keys.
• Use higher frequency for the Chipmunk engine (360Hz instead of 120Hz).
• Draw a small red dot on the body's center.

Version 0.1

• Initial public release.