我正在制作一个Java应用程序，我想知道是否有办法让jframe上的重绘速度变慢。让我详细说明，该应用程序有一个jframe并调用另一个jframe来显示一个必须从一侧移动到另一侧的图形，但它可以实现一个你可以实际看到该移动的速度。
编辑* 为了清楚自己，我正在添加一段代码。
import javax.swing.JFrame;
import javax.swing.JLabel;
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jButton1 = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Start");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1)
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addGap(152, 152, 152)
.addComponent(jButton1)
.addContainerGap(191, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(47, 47, 47)
.addComponent(jButton1)
.addGap(18, 18, 18)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 149, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(63, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String position="";
JFrame frame1=new JFrame();
JLabel label1=new JLabel();
label1.setText("Hello!");
frame1.add(label1);
frame1.setSize(400,300);
frame1.setVisible(true);
for(int i=1;i<20;i++){
label1.setLocation(i, i);
frame1.repaint();
position+="The label is at position: "+label1.getLocation()+"\n";
jTextArea1.setText(position);
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
NewJFrame frame= new NewJFrame();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
// End of variables declaration
}
我需要的是让frame1显示label1定位的动画，并在每次更改时获得在textarea中打印的位置线。感谢
答案 0 :(得分：3)
sleep sleep，您应该直接考虑Swing Timer 现在，如果你想看一个如何轻松改变移动元素速度的例子，你不必改变Swing Timer的频率，而是实际改变移动元素的速度。对于人来说，50Hz的频率通常就足够了。
这是一个小型演示代码：
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.MalformedURLException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class TestAnimation2 {
private static final int NB_OF_IMAGES_PER_SECOND = 50;
private static final int WIDTH = 800;
private static final int HEIGHT = 600;
private static final int MIN = 0;
private static final int MAX = 100;
private double speed = convert(50);
private double dx;
private double dy;
private double x = WIDTH / 2;
private double y = HEIGHT / 2;
private JFrame frame;
private CirclePanel circle;
private Runnable job;
private long lastMove = System.currentTimeMillis();
protected void initUI() throws MalformedURLException {
frame = new JFrame(TestAnimation2.class.getSimpleName());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(null);
circle = new CirclePanel();
circle.setSize(20, 20);
frame.add(circle);
frame.setSize(WIDTH, HEIGHT);
dx = speed;
dy = speed;
final JSlider slider = new JSlider(MIN, MAX);
slider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
speed = convert(slider.getValue());
if (dx > 0) {
dx = speed;
} else {
dx = -speed;
}
if (dy > 0) {
dy = speed;
} else {
dy = -speed;
}
}
});
slider.setValue(50);
slider.setLocation(0, 0);
slider.setSize(slider.getPreferredSize());
frame.add(slider);
frame.setVisible(true);
Timer t = new Timer(1000 / NB_OF_IMAGES_PER_SECOND, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
move();
}
});
t.start();
}
protected double convert(double sliderValue) {
return sliderValue + 1;
}
protected void move() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
x += dx;
y += dy;
if (x + circle.getWidth() > frame.getContentPane().getWidth()) {
x = frame.getContentPane().getWidth() - circle.getWidth();
dx = -speed;
} else if (x < 0) {
x = 0;
dx = speed;
}
if (y + circle.getHeight() > frame.getContentPane().getHeight()) {
y = frame.getContentPane().getHeight() - circle.getHeight();
dy = -speed;
} else if (y < 0) {
y = 0;
dy = speed;
}
circle.setLocation((int) x, (int) y);
circle.repaint();
}
});
}
public static class CirclePanel extends JPanel {
public CirclePanel() {
super();
setOpaque(false);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.RED);
g.fillOval(0, 0, getWidth(), getHeight());
}
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException,
UnsupportedLookAndFeelException {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
new TestAnimation2().initUI();
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
});
}
}