图像在移动时会有奇怪的行为吗？
图像在移动时会有奇怪的行为吗？
提问于 2018-06-03 14:02:45
该程序使用一个矩形，其中可以使用Image从JLabel中捕获Ball。
问题出在Timer类中，在该类中，计数器对时间进行计数。当它计算的时候，时间会显示在JLabel上。但是，本应捕获Ball的Image每次都会跳到起始位置，从而造成抖动。
我试着去掉JLabel，改用System.out.println()，效果也不错。
也许Swing Timer不喜欢调用JLabel，可能的原因是什么？
SimpleDateFormat df = new SimpleDateFormat("mm:ss:SSS");
timeL.setText("Time :" + df.format(duration - clockTime));
//System.out.println("Time :" + df.format(duration - clockTime));回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-05 05:13:01
代码被修改了一点，它像预期的那样工作，我希望它是正确的。
现在，图像可以独立于球的速度移动，并且图像停留在移动的位置。
要添加图片，请在项目文件夹中添加一个名为"resources“的新文件夹。我用Netbeans 8.2对其进行了测试。
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class ImageMoveTest implements ActionListener {
JPanel panel;
Image rimg;
Thread t;
int x;
int y;
int v;
int z;
int n;
public static void main(String[] args) throws InterruptedException, IOException {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
new ImageMoveTest().startApp();
} catch (InterruptedException ex) {
Logger.getLogger(ImageMoveTest.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(ImageMoveTest.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
public void startApp() throws InterruptedException, IOException {
panel = new DrawPanel();
InputStream inStream = this.getClass().getClassLoader().getResourceAsStream("i6.jpeg");
BufferedImage img = ImageIO.read(inStream);
rimg = img.getScaledInstance(150, 150, Image.SCALE_SMOOTH);
MoveMouse mm = new MoveMouse();
panel.addMouseMotionListener((MouseMotionListener) mm);
JFrame f = new JFrame();
f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(panel).setBackground(Color.white);
f.setSize(750, 750);
f.setResizable(false);
f.setVisible(true);
f.setLocationRelativeTo(null);
MathC mc = new MathC();
t = new Thread(mc);
t.start();
}
class MoveMouse extends JPanel implements MouseMotionListener {
@Override
public void mouseDragged(MouseEvent e) {
v=e.getX();
z=e.getY();
this.repaint();
}
@Override
public void mouseMoved(MouseEvent e) {
}
}
class MathC implements Runnable {
@Override
public void run() {
while(true) {
// x,y here
x = (int) (Math.random() * panel.getWidth());
y = (int) (Math.random() * panel.getHeight());
panel.repaint();
try {
t.sleep(700);
} catch (InterruptedException ex) {
Logger.getLogger(ImageMoveTest.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
@Override
public void actionPerformed(ActionEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
class DrawPanel extends JPanel {
public void update(Graphics g) {
super.paintChildren(g);
}
public void paintChildren( Graphics g) {
super.paintChildren(g);
drawIt(g);
// repaint the backround to see the single circle moving
// draw the Ball
g.setColor(Color.red);
g.fillOval(x, y, 35, 35);
g.drawOval(x, y, 35, 35);
this.repaint();
}
public void drawIt(Graphics g) {
super.paintChildren(g);
// draw Rectangle
g.drawRect(0,0,this.getWidth(),this.getHeight());
// draw the Image
g.drawImage(rimg, v, z, this);
this.repaint();
}
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50663710
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