这个是我的代码importjavax.swing.*;importjava.awt.*;importjava.awt.event.*;publicclassTestextendsJFrame{publicTest(){MyPanelmy=newMyPanel();add(my);}publicstaticvoidmain(S...
这个是我的代码
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Test extends JFrame {
public Test()
{
MyPanel my = new MyPanel();
add(my);
}
public static void main(String[] args)
{
JFrame f=new Test();
f.setSize(500, 500);
f.setVisible(true);
}
}
class MyPanel extends JPanel implements MouseListener {
private MyLabel l1;
public MyPanel()
{
setLayout(null);
}
protected void paintComponent(Graphics g) {
Image im = Toolkit.getDefaultToolkit().getImage(“back.jpg");//背景图
g.drawImage(im, 0, 0, this);
l1 = new MyLabel(new Point(90, 10));
l1.addMouseListener(this);
add(l1);
}
public void mouseClicked(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {
l1.setbk();//关键!!不是在Point(90,10) 处添加调整Label的background
}
public void mouseExited(MouseEvent e) {
repaint();
}
}
class MyLabel extends JLabel {
private Point p;
public MyLabel(Point point) {
super("");
p = point;
setBounds(p.x, p.y, 50, 50);
setBackground(new Color(0, 0, 0, 50));
setOpaque(true);
}
public void setbk() {
setBackground(new Color(0, 0, 0, 150));
}
}
我把鼠标放进透明label后，想要获得当前label所在透明度更低的图像块，可是得到的是基于原点的像素块，求助！！谢谢啊
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