Your project is to build a simple GUI that enables the user to create and view A

Question

Your project is to build a simple GUI that enables the user to create and view ASCII animations. Requirements:

Use a JFrame or JApplet as the primary interface

Extend whatever Swing elements you need to create the animation

Use at least one interface to handle events

Incorporate a custom panel to accept the animations

Include buttons or a menu interface to allow moving between frames, saving and loading

User should be able to edit any frame

User should be able to navigate between frames

There should be some mechanism for saving and loading animations

Explanation / Answer

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.Color; import java.awt.AlphaComposite; import javax.swing.*; import javax.swing.UIManager.LookAndFeelInfo; public class ButtonTest { private JFrame frame; private JButton opaqueButton1; private JButton opaqueButton2; private SoftJButton softButton1; private SoftJButton softButton2; private Timer alphaChanger; public void createAndShowGUI() { opaqueButton1 = new JButton("Opaque Button"); opaqueButton2 = new JButton("Opaque Button"); softButton1 = new SoftJButton("Transparent Button"); softButton2 = new SoftJButton("Transparent Button"); opaqueButton1.setBackground(Color.GREEN); softButton1.setBackground(Color.GREEN); frame = new JFrame(); frame.getContentPane().setLayout(new java.awt.GridLayout(2, 2, 10, 10)); frame.add(opaqueButton1); frame.add(softButton1); frame.add(opaqueButton2); frame.add(softButton2); frame.setSize(700, 300); frame.setLocation(150, 100); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); alphaChanger = new Timer(30, new ActionListener() { private float incrementer = -.03f; @Override public void actionPerformed(ActionEvent e) { float newAlpha = softButton1.getAlpha() + incrementer; if (newAlpha < 0) { newAlpha = 0; incrementer = -incrementer; } else if (newAlpha > 1f) { newAlpha = 1f; incrementer = -incrementer; } softButton1.setAlpha(newAlpha); softButton2.setAlpha(newAlpha); } }); alphaChanger.start(); Timer uiChanger = new Timer(3500, new ActionListener() { private final LookAndFeelInfo[] laf = UIManager.getInstalledLookAndFeels(); private int index = 1; @Override public void actionPerformed(ActionEvent e) { try { UIManager.setLookAndFeel(laf[index].getClassName()); SwingUtilities.updateComponentTreeUI(frame); opaqueButton1.setText(laf[index].getClassName()); softButton1.setText(laf[index].getClassName()); } catch (Exception exc) { exc.printStackTrace(); } index = (index + 1) % laf.length; } }); uiChanger.start(); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new ButtonTest().createAndShowGUI(); } }); } private static class SoftJButton extends JButton { private static final JButton lafDeterminer = new JButton(); private static final long serialVersionUID = 1L; private boolean rectangularLAF; private float alpha = 1f; SoftJButton() { this(null, null); } SoftJButton(String text) { this(text, null); } SoftJButton(String text, Icon icon) { super(text, icon); setOpaque(false); setFocusPainted(false); } public float getAlpha() { return alpha; } public void setAlpha(float alpha) { this.alpha = alpha; repaint(); } @Override public void paintComponent(java.awt.Graphics g) { java.awt.Graphics2D g2 = (java.awt.Graphics2D) g; g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha)); if (rectangularLAF && isBackgroundSet()) { Color c = getBackground(); g2.setColor(c); g.fillRect(0, 0, getWidth(), getHeight()); } super.paintComponent(g2); } @Override public void updateUI() { super.updateUI(); lafDeterminer.updateUI(); rectangularLAF = lafDeterminer.isOpaque(); } } }

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