Moving Button Container : Animation « Advanced Graphics « Java
Moving Button Container
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/*
* MovingButtonContainer.java
*
* Created on May 2, 2007, 4:39 PM
*
* Copyright (c) 2007, Sun Microsystems, Inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the TimingFramework project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
*
* @author Chet
*/
public class MovingButtonContainer extends JComponent implements ActionListener {
Timer timer; // for later start/stop actions
int animationDuration = 2000; // each animation will take 2 seconds
long animStartTime; // start time for each animation
int translateY = 0; // current Y location of button
static final int MAX_Y = 100;
JButton button = null;
private static final int DIVISIONS = 10;
static final int CHECKER_SIZE = 60;
/** Creates a new instance of TranslucentButton */
public MovingButtonContainer() {
setLayout(new java.awt.FlowLayout());
timer = new Timer(30, this);
button = new JButton("Start Animation");
// Need setOpaque(false) to force Swing to paint the button's parent
button.setOpaque(false);
button.addActionListener(this);
add(button);
}
/**
* This method handles both button clicks, which start/stop the animation,
* and Swing Timer events, which animate translateY.
*/
public void actionPerformed(ActionEvent ae) {
if (ae.getSource().equals(button)) {
// button click
if (!timer.isRunning()) {
animStartTime = System.nanoTime() / 1000000;
button.setText("Stop Animation");
timer.start();
} else {
timer.stop();
button.setText("Start Animation");
// reset translation to 0
translateY = 0;
// Must force repaint to get final animated position erased
repaint();
}
} else {
// Timer event
// calculate elapsed fraction
long currentTime = System.nanoTime() / 1000000;
long totalTime = currentTime - animStartTime;
if (totalTime > animationDuration) {
animStartTime = currentTime;
}
float fraction = (float)totalTime / animationDuration;
fraction = Math.min(1.0f, fraction);
// This calculation will cause translateY to go from 0 to MAX_Y
// as the fraction goes from 0 to 1
if (fraction < .5f) {
translateY = (int)(MAX_Y * (2 * fraction));
} else {
translateY = (int)(MAX_Y * (2 * (1 - fraction)));
}
// redisplay our container to paint the button in the new location
repaint();
}
}
/**
* Paint our container with a checkerboard background. Then set a
* translation factor on the Graphics object and call the superclass,
* which will paint the children (e.g, our button) with this
* translation.
*/
public void paint(Graphics g) {
g.setColor(Color.white);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.BLACK);
for (int stripeX = 0; stripeX < getWidth(); stripeX += CHECKER_SIZE) {
for (int y = 0, row = 0; y < getHeight(); y += CHECKER_SIZE/2, ++row) {
int x = (row % 2 == 0) ? stripeX : (stripeX + CHECKER_SIZE/2);
g.fillRect(x, y, CHECKER_SIZE/2, CHECKER_SIZE/2);
}
}
// Translate our graphics according to the animated translateY value
g.translate(0, translateY);
// Defer to superclass to handle painting for component, which includes
// painting the children of this container
super.paint(g);
}
private static void createAndShowGUI() {
JFrame f = new JFrame("Moving Button Container");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(300, 300);
JComponent buttonContainer = new MovingButtonContainer();
f.add(buttonContainer);
f.setVisible(true);
}
public static void main(String args[]) {
Runnable doCreateAndShowGUI = new Runnable() {
public void run() {
createAndShowGUI();
}
};
SwingUtilities.invokeLater(doCreateAndShowGUI);
}
}
