供你参考一下:
import javax.swing.*
import java.awt.*
import java.awt.event.*
import java.awt.image.BufferedImage
public class lianxi3 extends JFrame implements ActionListener {
JPanel jPanel
JLabel jLabel
Image image
ImageIcon imageIcon
JButton jButton
float www = 1
float hhh = 1
public lianxi3() {
super("图片")
jButton = new JButton("变大")
jButton.addActionListener(this)
image = Toolkit.getDefaultToolkit().getImage("src/img1.jpg")
jLabel = new JLabel()
jPanel = new JPanel()
imageIcon = new ImageIcon(image)
jLabel.setIcon(imageIcon)
jPanel.add(jLabel)
this.add(jLabel, BorderLayout.NORTH)
this.add(jButton, BorderLayout.SOUTH)
this.setVisible(true)
this.setSize(600, 600)
}
public static void main(String[] args) {
new lianxi3()
}
public void big() {
int width = image.getHeight(jLabel)
int height = image.getWidth(jLabel)
double bigger = 1.5
www = (float) (width * bigger)
hhh = (float) (height * bigger)
BufferedImage bufImg = new BufferedImage(image.getWidth(null), image.getHeight(null),BufferedImage.TYPE_4BYTE_ABGR)
Graphics g = bufImg .createGraphics()
g.drawImage(image, 0, 0, null)
g.dispose()
imageIcon.setImage(rotateImage(bufImg,30))
//imageIcon.setImage(imageIcon.getImage().getScaledInstance((int)www, (int)hhh, Image.SCALE_DEFAULT))
jLabel.setIcon(imageIcon)
jLabel.setSize((int)www, (int)hhh)
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == jButton) {
big()
System.out.println("aaa")
}
}
public static BufferedImage rotateImage(final BufferedImage bufferedimage,
final int degree) {
int w = bufferedimage.getWidth()
int h = bufferedimage.getHeight()
int nw = (int) (bufferedimage.getWidth()*1.414)
int nh = (int) (bufferedimage.getHeight()*1.414)
int type = bufferedimage.getColorModel().getTransparency()
BufferedImage img
Graphics2D graphics2d
(graphics2d = (img = new BufferedImage(nw, nh, type))
.createGraphics()).setRenderingHint(
RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR)
graphics2d.rotate(Math.toRadians(degree), nw / 2, nh / 2)
graphics2d.translate(nw/2-w/2, nh/2-h/2)
graphics2d.drawImage(bufferedimage, 0, 0, null)
graphics2d.dispose()
return img
}
}
一个图片时你知道,现在只是切换的问题?给按钮添加一个 ActionListener,在它的 actionPerformed 方法中做你的事情,把 jpanel.setIcon(..) 换张图片。
用JTabPanel 的话 不好实现这个图片的效果的。利用俩个 pane 方式。 其中一个隐藏 。 上面标签用 JLable 实现。 。 但点击其中一个Lable 的时候 JLabel 本身切换背景图片 切换俩个JPanel 的 显示。
这种效果我做过。