Smooth Moves
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/*
* SmoothMoves.java
*
* Created on May 2, 2007, 4:49 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 SmoothMoves extends JComponent implements ActionListener, KeyListener {
/** image holds the graphics we render for each animating object */
BufferedImage image = null;
static int imageW = 100;
static int imageH = 150;
/** Location of fading animation */
int fadeX = 50;
int fadeY = 50;
/** X values that moving animation will move between */
static int moveMinX = 150;
static int moveMaxX = 350;
/** Current x/y location of moving animation */
int moveX = moveMinX;
int moveY = 50;
/** Current opacity of fading animation */
float opacity = 0.0f;
/** Toggles for various demo options (key to toggle in parentheses) */
boolean useImage = false; // (i) image instead of rectangle
boolean useAA = false; // (a) anti-aliased edges (rectangle only)
boolean motionBlur = false; // (b) ghost images behind moving animation
boolean alterColor = false; // (c) light-gray instead of black rectangle
boolean linear = true; // (l) linear vs. non-linear motion
/** Used for motion blur rendering; holds information for ghost trail */
int blurSize = 5;
int prevMoveX[];
int prevMoveY[];
float trailOpacity[];
/** Basic Timer animation info */
final static int CYCLE_TIME = 2000; // One cycle takes 2 seconds
int currentResolution = 50; // current Timer resolution
Timer timer = null; // animation Timer
long cycleStart; // track start time for each cycle
/** Creates a new instance of SmoothAnimation */
public SmoothMoves() {
// createAnimationImage();
cycleStart = System.nanoTime() / 1000000;
startTimer(currentResolution);
}
/**
* Create the image that will be animated. This image may be an actual image
* (duke.gif), or some graphics (a variation on a black filled rectangle) that
* are rendered into an image. The contents of this image are dependent upon
* the runtime toggles that have been set when this method is called.
*/
void createAnimationImage() {
GraphicsConfiguration gc = getGraphicsConfiguration();
image = gc.createCompatibleImage(imageW, imageH, Transparency.TRANSLUCENT);
Graphics2D gImg = image.createGraphics();
if (useImage) {
try {
URL url = getClass().getResource("duke.gif");
Image originalImage = ImageIO.read(url);
gImg.drawImage(originalImage, 0, 0, imageW, imageH, null);
} catch (Exception e) {
}
} else {
// use graphics
Color graphicsColor;
if (alterColor) {
graphicsColor = Color.LIGHT_GRAY;
} else {
graphicsColor = Color.BLACK;
}
gImg.setColor(graphicsColor);
gImg.fillRect(0, 0, imageW, imageH);
if (useAA) {
// Antialiasing hack - just draw a fading-out border around the
// rectangle
gImg.setComposite(AlphaComposite.Src);
int red = graphicsColor.getRed();
int green = graphicsColor.getRed();
int blue = graphicsColor.getRed();
gImg.setColor(new Color(red, green, blue, 50));
gImg.drawRect(0, 0, imageW - 1, imageH - 1);
gImg.setColor(new Color(red, green, blue, 100));
gImg.drawRect(1, 1, imageW - 3, imageH - 3);
gImg.setColor(new Color(red, green, blue, 150));
gImg.drawRect(2, 2, imageW - 5, imageH - 5);
gImg.setColor(new Color(red, green, blue, 200));
gImg.drawRect(3, 3, imageW - 7, imageH - 7);
gImg.setColor(new Color(red, green, blue, 225));
gImg.drawRect(4, 4, imageW - 9, imageH - 9);
}
}
gImg.dispose();
}
public void paintComponent(Graphics g) {
if (image == null) {
createAnimationImage();
}
// Erase the background
g.setColor(Color.WHITE);
g.fillRect(0, 0, getWidth(), getHeight());
// Draw the fading image
Graphics2D gFade = (Graphics2D) g.create();
gFade.setComposite(AlphaComposite.SrcOver.derive(opacity));
gFade.drawImage(image, fadeX, fadeY, null);
gFade.dispose();
// Draw the moving image
if (motionBlur) {
// Draw previous locations of the image as a trail of
// ghost images
if (prevMoveX == null) {
// blur location array not yet created; create it now
prevMoveX = new int[blurSize];
prevMoveY = new int[blurSize];
trailOpacity = new float[blurSize];
float incrementalFactor = .2f / (blurSize + 1);
for (int i = 0; i < blurSize; ++i) {
// default values, act as flag to not render these
// until they have real values
prevMoveX[i] = -1;
prevMoveY[i] = -1;
// vary the translucency by the number of the ghost
// image; the further away it is from the current one,
// the more faded it will be
trailOpacity[i] = (.2f - incrementalFactor) - i * incrementalFactor;
}
} else {
Graphics2D gTrail = (Graphics2D) g.create();
for (int i = 0; i < blurSize; ++i) {
if (prevMoveX[i] >= 0) {
// Render each blur image with the appropriate
// amount of translucency
gTrail.setComposite(AlphaComposite.SrcOver.derive(trailOpacity[i]));
gTrail.drawImage(image, prevMoveX[i], prevMoveY[i], null);
}
}
gTrail.dispose();
}
}
g.drawImage(image, moveX, moveY, null);
if (motionBlur) {
// shift the ghost positions to add the current position and
// drop the oldest one
for (int i = blurSize - 1; i > 0; --i) {
prevMoveX[i] = prevMoveX[i - 1];
prevMoveY[i] = prevMoveY[i - 1];
}
prevMoveX[0] = moveX;
prevMoveY[0] = moveY;
}
}
/**
* This method handles the events from the Swing Timer
*/
public void actionPerformed(ActionEvent ae) {
// calculate the fraction elapsed of the animation and call animate()
// to alter the values accordingly
long currentTime = System.nanoTime() / 1000000;
long totalTime = currentTime - cycleStart;
if (totalTime > CYCLE_TIME) {
cycleStart = currentTime;
}
float fraction = (float) totalTime / CYCLE_TIME;
fraction = Math.min(1.0f, fraction);
fraction = 1 - Math.abs(1 - (2 * fraction));
animate(fraction);
}
/**
* Animate the opacity and location factors, according to the current
* fraction.
*/
public void animate(float fraction) {
float animationFactor;
if (linear) {
animationFactor = fraction;
} else {
// Our "nonlinear" motion just uses a sin function to get a
// simple bounce behavior
animationFactor = (float) Math.sin(fraction * (float) Math.PI / 2);
}
// Clamp the value to make sure it does not exceed the bounds
animationFactor = Math.min(animationFactor, 1.0f);
animationFactor = Math.max(animationFactor, 0.0f);
// The opacity, used by the fading animation, will just use the
// animation fraction directly
opacity = animationFactor;
// The move animation will calculate a location based on a linear
// interpolation between its start and end points using the fraction
moveX = moveMinX + (int) (.5f + animationFactor * (float) (moveMaxX - moveMinX));
// redisplay our component with the new animated values
repaint();
}
/**
* Moves the frame rate up or down by changing the Timer resolution
*/
private void changeResolution(boolean faster) {
if (faster) {
currentResolution -= 5;
} else {
currentResolution += 5;
}
currentResolution = Math.max(currentResolution, 0);
currentResolution = Math.min(currentResolution, 500);
startTimer(currentResolution);
}
/**
* Starts the animation
*/
private void startTimer(int resolution) {
if (timer != null) {
timer.stop();
timer.setDelay(resolution);
} else {
timer = new Timer(resolution, this);
}
timer.start();
}
/**
* Toggles various rendering flags
*/
public void keyPressed(KeyEvent ke) {
int keyCode = ke.getKeyCode();
if (keyCode == KeyEvent.VK_B) {
// B: Motion blur - displays trail of ghost images
motionBlur = !motionBlur;
} else if (keyCode == KeyEvent.VK_A) {
// A: Antialiasing - Displays soft edges around graphics
useAA = !useAA;
createAnimationImage();
} else if (keyCode == KeyEvent.VK_C) {
// C: Color - Toggles rectangle color between dark and light colors
alterColor = !alterColor;
createAnimationImage();
} else if (keyCode == KeyEvent.VK_I) {
// I: Image - Toggles use of image or filled rectangle to show how
// straight edges affect animation perception
useImage = !useImage;
createAnimationImage();
} else if (keyCode == KeyEvent.VK_UP) {
// Up Arrow: Speed - Speeds up frame rate
changeResolution(true);
} else if (keyCode == KeyEvent.VK_DOWN) {
// Down Arrow: Speed - Slows down frame rate
changeResolution(false);
} else if (keyCode == KeyEvent.VK_L) {
// L: Linearity: Toggles linear/nonlinear motion
linear = !linear;
} else if (keyCode >= KeyEvent.VK_1 && keyCode <= KeyEvent.VK_9) {
// 0-9: Blur size: Toggles size of ghost trail for motion blur
blurSize = keyCode - KeyEvent.VK_0;
prevMoveX = prevMoveY = null;
}
}
// Unused KeyListener implementations
public void keyReleased(KeyEvent ke) {
}
public void keyTyped(KeyEvent ke) {
}
private static void createAndShowGUI() {
JFrame f = new JFrame("Smooth Moves");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(moveMaxX + imageW + 50, 300);
SmoothMoves component = new SmoothMoves();
f.add(component);
f.setVisible(true);
f.addKeyListener(component);
}
public static void main(String[] args) {
Runnable doCreateAndShowGUI = new Runnable() {
public void run() {
createAndShowGUI();
}
};
SwingUtilities.invokeLater(doCreateAndShowGUI);
}
}
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