Java 7 for Absolute Beginners

CHAPTER 10 ■ ANIMATION

Listing 10-3. The Fireworks class

package com.bryantcs.examples.animation;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.Timer;

public class Fireworks implements ActionListener {

private static final long serialVersionUID = 1L;

FireworksPanel fireworksPanel = new FireworksPanel();

JFrame frame = new JFrame("Fireworks");

JPanel buttonPanel=new JPanel(new FlowLayout(FlowLayout.CENTER));

JButton actionButton=new JButton("Go");

boolean animating = false;

// Here's the timer, which checks for user actions

// and, if the animation is running, redraws the

// screen. It does both 25 times per second

// (1000 milliseconds divided by 40).

Timer timer = new Timer(40, this);

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);

JMenuBar menuBar = new JMenuBar();

menuBar.add(file);

frame.setJMenuBar(menuBar);

}

private void createAndShowGUI() {

addMenu(frame);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().setLayout(new BorderLayout());

actionButton.addActionListener(this);

buttonPanel.add(actionButton);

fireworksPanel.setPreferredSize(new Dimension(400, 200));