Animated Graphics
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/*
* AnimatedGraphics_2008.java
*
* Created on May 2, 2007, 4:02 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 AnimatedGraphics_2008 extends JComponent implements ActionListener {
Color startColor = Color.GRAY; // where we start
Color endColor = Color.BLACK; // where we end
Color currentColor = startColor;
int animationDuration = 2000; // each animation will take 2 seconds
long animStartTime; // start time for each animation
/**
* Set up and start the timer
*/
public AnimatedGraphics_2008() {
Timer timer = new Timer(30, this);
// initial delay while window gets set up
timer.setInitialDelay(1000);
animStartTime = 1000 + System.nanoTime() / 1000000;
timer.start();
}
/**
* Erase to the background color and fill an oval with the current
* color (which is being animated elsewhere)
*/
public void paintComponent(Graphics g) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(currentColor);
g.fillOval(0, 0, getWidth(), getHeight());
}
/**
* Callback from the Swing Timer. Calculate the fraction elapsed of
* our desired animation duration and interpolate between our start and
* end colors accordingly.
*/
public void actionPerformed(ActionEvent ae) {
// calculate elapsed fraction of animation
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);
// interpolate between start and end colors with current fraction
int red = (int)(fraction * endColor.getRed() +
(1 - fraction) * startColor.getRed());
int green = (int)(fraction * endColor.getGreen() +
(1 - fraction) * startColor.getGreen());
int blue = (int)(fraction * endColor.getBlue() +
(1 - fraction) * startColor.getBlue());
// set our new color appropriately
currentColor = new Color(red, green, blue);
// force a repaint to display our oval with its new color
repaint();
}
private static void createAndShowGUI() {
JFrame f = new JFrame("Animated Graphics");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(200, 200);
f.add(new AnimatedGraphics_2008());
f.setVisible(true);
}
public static void main(String args[]) {
Runnable doCreateAndShowGUI = new Runnable() {
public void run() {
createAndShowGUI();
}
};
SwingUtilities.invokeLater(doCreateAndShowGUI);
}
}
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