Usage΅G

    Press Start to view the animation.
    Press Reset for default values.
    Left click to pause the animation, click it again to resume.
        Click and drag the black circle to change the initial condition;
            length and angle.

Your suggestions are highly appreciated! Please click hwang@phy03.phy.ntnu.edu.tw

Author΅GFu-Kwun Hwang, Dept. of physics, National Taiwan Normal University