Java 7 for Absolute Beginners

CHAPTER 14 ■ RECURSION

Drawing a Fractal Tree

One of my other favorite fractals is the fractal tree because it really does resemble a tree (at first glance,
anyway). Here's the program class:

Listing 14-6. FractalTree.java

package com.bryantcs.examples.fractals;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

public class FractalTree implements ActionListener {

private FractalTreePanel
fractalTreePanel = new FractalTreePanel();

private JFrame frame = new JFrame("Fractal Tree");

private void addMenu(JFrame frame) {
JMenu file = new JMenu("File");
file.setMnemonic('F');
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.setMnemonic('x');
exitItem.addActionListener(this);
file.add(exitItem);
JMenuItem redrawItem = new JMenuItem("Repaint");
redrawItem.setMnemonic('r');
redrawItem.addActionListener(this);
file.add(redrawItem);
JMenuBar menuBar = new JMenuBar();
menuBar.add(file);
frame.setJMenuBar(menuBar);
}

private void createAndShowGUI() {
addMenu(frame);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fractalTreePanel.setPreferredSize(new Dimension(600, 450));
fractalTreePanel.setBackground(Color.WHITE);
frame.getContentPane().add(fractalTreePanel);
frame.pack();
frame.setVisible(true);
}