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 AnimatedGraphics2008 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 AnimatedGraphics2008() { 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 AnimatedGraphics2008()); f.setVisible(true); } public static void main(String args[]) { Runnable doCreateAndShowGUI = new Runnable() { public void run() { createAndShowGUI(); } }; SwingUtilities.invokeLater(doCreateAndShowGUI); } }