import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
public class TransformTest
{ public static void main(String[] args)
{ JFrame frame = new TransformTestFrame();
frame.show();
}
}
class TransformTestFrame extends JFrame
implements ActionListener
{ public TransformTestFrame()
{ setTitle("TransformTest");
setSize(400, 400);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
} );
Container contentPane = getContentPane();
canvas = new TransformPanel();
contentPane.add(canvas, "Center");
JPanel buttonPanel = new JPanel();
ButtonGroup group = new ButtonGroup();
rotateButton = new JRadioButton("Rotate", true);
buttonPanel.add(rotateButton);
group.add(rotateButton);
rotateButton.addActionListener(this);
translateButton = new JRadioButton("Translate", false);
buttonPanel.add(translateButton);
group.add(translateButton);
translateButton.addActionListener(this);
scaleButton = new JRadioButton("Scale", false);
buttonPanel.add(scaleButton);
group.add(scaleButton);
scaleButton.addActionListener(this);
shearButton = new JRadioButton("Shear", false);
buttonPanel.add(shearButton);
group.add(shearButton);
shearButton.addActionListener(this);
contentPane.add(buttonPanel, "North");
}
public void actionPerformed(ActionEvent event)
{ Object source = event.getSource();
if (source == rotateButton) canvas.setRotate();
else if (source == translateButton) canvas.setTranslate();
else if (source == scaleButton) canvas.setScale();
else if (source == shearButton) canvas.setShear();
}
private TransformPanel canvas;
private JRadioButton rotateButton;
private JRadioButton translateButton;
private JRadioButton scaleButton;
private JRadioButton shearButton;
}
class TransformPanel extends JPanel
{ public TransformPanel()
{ img=new ImageIcon("antialiased.png").getImage();
t = new AffineTransform();
setRotate();
}
public void paintComponent(Graphics g)
{ super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.drawImage(img,0,0,null);//画原图
g2.translate(getWidth() / 2, getHeight() / 2);//平移坐标轴，将原点移到组件中心
g2.transform(t);//设置仿射变换
/* we don't use setTransform because we want
to compose with the current translation
*/
g2.drawImage(img,-50,-50,null);//在新坐标系中画图像
}
public void setRotate()
{ t.setToRotation(Math.toRadians(60));//旋转
repaint();
}
public void setTranslate()
{ t.setToTranslation(60, 15);//平移
repaint();
}
public void setScale()
{ t.setToScale(-1, 1);//翻转图像
repaint();
}
public void setShear()
{ t.setToShear(-0.2, 2);//剪切
repaint();
}
private Image img;
private AffineTransform t;
}
</td> <td width="181" valign="top" class="ArticleTeitle">
</td> </tr> <tr> <td height="25" colspan="2" valign="top" class="ArticleTeitle">
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