import java.awt.*; import java.awt.event.*; import javax.swing.*;public class SelfContainedPanel extends JPanel { private int x1, y1, x2, y2; // set up mouse event handling for SelfContainedPanel public SelfContainedPanel() { // set up mouse listener addMouseListener( new MouseAdapter() { // anonymous inner class // handle mouse press event public void mousePressed( MouseEvent event ) { x1 = event.getX(); y1 = event.getY(); } // handle mouse release event public void mouseReleased( MouseEvent event ) { x2 = event.getX(); y2 = event.getY(); repaint(); } } // end anonymous inner class ); // end call to addMouseListener // set up mouse motion listener addMouseMotionListener( new MouseMotionAdapter() { // anonymous inner class
// handle mouse drag event public void mouseDragged( MouseEvent event ) { x2 = event.getX(); y2 = event.getY(); repaint(); } } // end anonymous inner class ); // end call to addMouseMotionListener } // end constructor SelfContainedPanel // return preferred width and height of SelfContainedPanel public Dimension getPreferredSize() { return new Dimension( 150, 100 ); } // paint an oval at the specified coordinates public void paintComponent( Graphics g ) { super.paintComponent( g ); g.drawOval( Math.min( x1, x2 ), Math.min( y1, y2 ), Math.abs( x1 - x2 ), Math.abs( y1 - y2 ) ); }} // end class SelfContainedPanel /************************************************************************** * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and * * Prentice Hall. All Rights Reserved. * * * * DISCLAIMER: The authors and publisher of this book have used their * * best efforts in preparing the book. These efforts include the * * development, research, and testing of the theories and programs * * to determine their effectiveness. The authors and publisher make * * no warranty of any kind, expressed or implied, with regard to these * * programs or to the documentation contained in these books. The authors * * and publisher shall not be liable in any event for incidental or * * consequential damages in connection with, or arising out of, the * * furnishing, performance, or use of these programs. * *************************************************************************/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class SelfContainedPanel extends JPanel {
private int x1, y1, x2, y2; // set up mouse event handling for SelfContainedPanel
public SelfContainedPanel()
{
// set up mouse listener
addMouseListener( new MouseAdapter() { // anonymous inner class // handle mouse press event
public void mousePressed( MouseEvent event )
{
x1 = event.getX();
y1 = event.getY();
} // handle mouse release event
public void mouseReleased( MouseEvent event )
{
x2 = event.getX();
y2 = event.getY();
repaint();
} } // end anonymous inner class ); // end call to addMouseListener // set up mouse motion listener
addMouseMotionListener( new MouseMotionAdapter() { // anonymous inner class
// handle mouse drag event
public void mouseDragged( MouseEvent event )
{
x2 = event.getX();
y2 = event.getY();
repaint();
} } // end anonymous inner class ); // end call to addMouseMotionListener } // end constructor SelfContainedPanel // return preferred width and height of SelfContainedPanel
public Dimension getPreferredSize()
{
return new Dimension( 150, 100 );
} // paint an oval at the specified coordinates
public void paintComponent( Graphics g )
{
super.paintComponent( g ); g.drawOval( Math.min( x1, x2 ), Math.min( y1, y2 ),
Math.abs( x1 - x2 ), Math.abs( y1 - y2 ) );
}} // end class SelfContainedPanel
/**************************************************************************
* (C) Copyright 1992-2003 by Deitel & Associates, Inc. and *
* Prentice Hall. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
*************************************************************************/