原始问题：
此方法应该将正在JFrame上显示的图像逐渐更改为另一个图像。但是，如果没有某种方法可以减慢速度，它似乎只会从一个图像变为新图像。为了减慢速度，我输入了一个Thread.sleep（1000），这样就不会立即发生变化。但是，有了这一行，我的程序完全冻结了。没有错误消息，没有任何消息。有人可以帮帮我吗？建议一种更好的方法来减慢速度，或者如何解决这个问题。
澄清：int k是变化中渐进步骤的数量。 k = 1将是瞬间变化。任何更大的东西都是渐进的变化。 int l同时控制每个图像显示的比例。
public void morphImg(int width, int height, BufferedImage morphImage, int k) {
//creates new image from two images of same size
BufferedImage image2 = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
//get color from original image
Color c = new Color(image.getRGB(i, j));
//get colors from morph image
Color c2 = new Color(morphImage.getRGB(i, j));
for (int l = 1; l <= k; l++) {
//gets colors at different stages
int r = ((k-l)*c.getRed()/k) + (l*c2.getRed()/k);
int g = ((k-l)*c.getGreen()/k) + (l*c2.getGreen()/k);
int b = ((k-l)*c.getBlue()/k) + (l*c2.getBlue()/k);
Color newColor = new Color(r, g, b);
//set colors of new image to average of the two images
image2.setRGB(i, j, newColor.getRGB());
//display new image
try {
imageLabel.setIcon(new ImageIcon(image2));
Thread.sleep(1000);
}
catch (InterruptedException e){
System.out.println("Exception caught.");
}
}
}
}
//sets modified image as "original" for further manipulation
setImage(image2);
}
更新的代码：使用计时器也会导致程序冻结......我没有使用它吗？
public void morphImg(int width, int height, BufferedImage morphImage, int k) {
//creates new image from two images of same size
final BufferedImage image2 = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int l = 1; l <= k; l++) {
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
//get color from original image
Color c = new Color(image.getRGB(i, j));
//get colors from morph image
Color c2 = new Color(morphImage.getRGB(i, j));
//gets colors at different stages
int r = ((k-l)*c.getRed()/k) + (l*c2.getRed()/k);
int g = ((k-l)*c.getGreen()/k) + (l*c2.getGreen()/k);
int b = ((k-l)*c.getBlue()/k) + (l*c2.getBlue()/k);
Color newColor = new Color(r, g, b);
//set colors of new image to average of the two images
image2.setRGB(i, j, newColor.getRGB());
//display new image
imageLabel.setIcon(new ImageIcon(image2));
final Timer t = new Timer(500,null);
t.setInitialDelay(500);
t.start();
}
}
}
//sets modified image as "original" for further manipulation
setImage(image2);
}
答案 0 :(得分：5)
在事件调度线程上执行代码时，切勿使用Thread.sleep（）。
相反，您应该使用Swing Timer来安排动画。
请参阅Swing tutorial上的部分：
或者如果您不想使用Timer，那么您可以使用SwingWorker（如并发教程中所述），然后在更改后立即发布（）图像。然后你可以使用Thread.sleep（），因为SwingWorker不能在EDT上执行。
简单计时器示例：
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class TimerTime extends JFrame implements ActionListener
{
JLabel timeLabel;
public TimerTime()
{
timeLabel = new JLabel( new Date().toString() );
getContentPane().add(timeLabel, BorderLayout.NORTH);
}
public void actionPerformed(ActionEvent e)
{
timeLabel.setText( new Date().toString() );
}
public static void main(String[] args)
{
TimerTime frame = new TimerTime();
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
int time = 1000;
javax.swing.Timer timer = new javax.swing.Timer(time, frame);
timer.setInitialDelay(1);
timer.start();
}
}
答案 1 :(得分：1)
k上的循环应该是最外层的循环。现在你调用Thread.sleep k * width * height times。
答案 2 :(得分：0)
如果打算显示变形效果的渐进式动画，下面是我使用Timer或Thread.sleep() 使用最新的变形代码执行 的测试代码通过OP：
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JApplet;
import javax.swing.JFrame;
class MorphComponent extends Component {
/**
*
*/
private static final long serialVersionUID = 1L;
private BufferedImage bi;
private URL imageSrc1;
private URL imageSrc2;
public MorphComponent(URL imageSrc1, URL imageSrc2) {
this.imageSrc1 = imageSrc1;
this.imageSrc2 = imageSrc2;
try {
BufferedImage img1 = ImageIO.read(imageSrc1);
//BufferedImage img2 = ImageIO.read(imageSrc2);
int w = img1.getWidth(null);
int h = img1.getHeight(null);
bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics g = bi.getGraphics();
g.drawImage(img1, 0, 0, null);
} catch (IOException e) {
System.out.println("Image could not be read");
System.exit(1);
}
}
public Dimension getPreferredSize() {
return new Dimension(bi.getWidth(null), bi.getHeight(null));
}
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D)g;
g2d.setColor(Color.white);
g2d.fillRect(0,0, getWidth(), getHeight());
try {
BufferedImage img1 = ImageIO.read(imageSrc1);
BufferedImage img2 = ImageIO.read(imageSrc2);
int w = img1.getWidth(null);
int h = img1.getHeight(null);
bi = morphImg(g, img1, img2, w, h, 10);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private long start = System.currentTimeMillis();
public BufferedImage morphImg(Graphics gp, BufferedImage originalImage, BufferedImage morphImage, int width, int height, int k) {
//creates new image from two images of same size
final BufferedImage image2 = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int l = 1; l <= k; l++) {
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
long elapsed = System.currentTimeMillis() - start;
//get color from original image
Color c = new Color(originalImage.getRGB(i, j));
//get colors from morph image
Color c2 = new Color(morphImage.getRGB(i, j));
//gets colors at different stages
int r = ((k-l)*c.getRed()/k) + (l*c2.getRed()/k);
int g = ((k-l)*c.getGreen()/k) + (l*c2.getGreen()/k);
int b = ((k-l)*c.getBlue()/k) + (l*c2.getBlue()/k);
Color newColor = new Color(r, g, b);
//set colors of new image to average of the two images
image2.setRGB(i, j, newColor.getRGB());
if( elapsed > 100 ) {
gp.drawImage(image2, 0, 0, null);
start = System.currentTimeMillis();
repaint();
}
}
}
}
return image2;
}
}
public class MorphImageApplet extends JApplet {
/**
*
*/
private static final long serialVersionUID = 1L;
static String imageFileName1 = "image_1.jpg";
static String imageFileName2 = "image_2.jpg";
private URL imageSrc1;
private URL imageSrc2;
public MorphImageApplet () {
}
public MorphImageApplet (URL imageSrc1, URL imageSrc2) {
this.imageSrc1 = imageSrc1;
this.imageSrc2 = imageSrc2;
}
public void init() {
try {
imageSrc1 = new URL(getCodeBase(), imageFileName1);
imageSrc2 = new URL(getCodeBase(), imageFileName2);
} catch (MalformedURLException e) {
}
buildUI();
}
public void buildUI() {
final MorphComponent st = new MorphComponent(imageSrc1, imageSrc2);
add("Center", st);
}
public static void main(String s[]) {
JFrame f = new JFrame("See Through Image");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
URL imageSrc1 = null;
URL imageSrc2 = null;
try {
imageSrc1 = ((new File(imageFileName1)).toURI()).toURL();
imageSrc2 = ((new File(imageFileName2)).toURI()).toURL();
} catch (MalformedURLException e) {
}
MorphImageApplet sta = new MorphImageApplet(imageSrc1, imageSrc2);
sta.buildUI();
f.add("Center", sta);
f.pack();
f.setVisible(true);
}
}