[英]How to make an image blink in a random position?
我在JApplet
有一個圖像,我希望它以隨機位置顯示。 1秒后它將消失,並在另一個隨機位置再次出現。
如何實現“隨機閃爍”?
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.net.URL;
public class Random extends JApplet
{
Image ball;
public void init()
{
try
{
URL pic = new URL(getDocumentBase(), "ball.gif");
ball = ImageIO.read(pic);
}
catch (Exception e)
{
e.printStackTrace();
}
}
public void paint(Graphics g)
{
if (ball != null)
{
g.drawImage(ball,50,50,50,50,this);
}
}
}
為了我的錢,我將Image放在ImageIcon中,將ImageIcon放在JLabel中,然后使用Swing Timer和Random對象將JLabel隨機移動。 您必須將其移動到一個布局已設置為null的容器中(contentPane會這樣做),並且必須將JLabel的大小指定為其preferredSize才能起作用。
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.util.Random;
class ImageBlinker extends JComponent {
BufferedImage image;
boolean showImage;
int x = -1;
int y = -1;
Random r;
ImageBlinker() {
// put your image reading code here..
image = new BufferedImage(32,32,BufferedImage.TYPE_INT_ARGB);
Graphics g = image.createGraphics();
g.setColor(Color.ORANGE);
g.fillOval(0,0,32,32);
// END - image read
r = new Random();
ActionListener listener = new ActionListener(){
public void actionPerformed(ActionEvent ae) {
if (image!=null) {
if (!showImage) {
int w = image.getWidth();
int h = image.getHeight();
int rx = getWidth()-w;
int ry = getHeight()-h;
if (rx>-1 && ry>-1) {
x = r.nextInt(rx);
y = r.nextInt(ry);
}
}
showImage = !showImage;
repaint();
}
}
};
Timer timer = new Timer(600,listener);
timer.start();
setPreferredSize(new Dimension(150,100));
JOptionPane.showMessageDialog(null, this);
timer.stop();
}
public void paintComponent(Graphics g) {
g.setColor(Color.BLUE);
g.fillRect(0,0,getWidth(),getHeight());
if (showImage && image!=null) {
g.drawImage(image,x,y,this);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new ImageBlinker();
}
});
}
}
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