Homework #5 -- sample code

The instructor's version of homework #5 implements two instances of each of three different animation classes.

• ActionTest05.java is the main program.
• Animator.java is an interface describing a generic Animator object with one method, oneFrame(Component comp,Graphics g).
• Panel05.java is a thin subclass of JPane with an instance variable that stores a reference to an Animator.
• AnimationAction.java defines an AbstractAction subclass which switches the current Animator in a Panel05.
• Trajectory.java abstracts the concept of a point bouncing around in a rectangular space.
• AnimatedBalls.java displays an animation of nballs balls bouncing around in a Panel05. It uses one Trajectory for each ball.
• AnimatedLines.java displays an animated set of nlines lines following each other around in a Panel05. It uses two Trajectory objects, one for each end of a single line, and displays the lines corresponding to the nlines most recent values of each.
• Spinner.java implements a text message spinning in the middle of a Panel05.

Here are some screen shots of the animations in action: