Oprea

DrawingAnOvalJPanel

---

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

public class TheWindow extends JFrame{

private JSlider slider;
private DrawOval myPanel;

public TheWindow() {
super("title");
myPanel = new DrawOval();
myPanel.setBackground(Color.WHITE);

slider = new JSlider(SwingConstants.HORIZONTAL, 0, 200, 10);
slider.setMajorTickSpacing(10);
slider.setPaintTicks(true);

slider.addChangeListener(
new ChangeListener() {
public void stateChanged(ChangeEvent e) {
myPanel.setD(slider.getValue());
}
}
);
add(slider, BorderLayout.SOUTH);
add(myPanel, BorderLayout.CENTER);
}
}

 

import java.awt.*;
import javax.swing.*;

public class DrawOval extends JPanel{

private int d = 10;
public void paintComponent (Graphics g) {
super.paintComponent(g);
g.fillOval(10, 10, d, d);
}

public void setD( int newD) {
d = (newD >= 0 ? newD : 10);
repaint();
}

public Dimension getPreferredSize() {
return new Dimension(200, 200);
}

public Dimension getMinimumSize() {
return getPreferredSize();
}

}

 

import javax.swing.JFrame;

public class apple {

public static void main(String[] args) {

TheWindow w = new TheWindow();
w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
w.setSize(640, 480);
w.setVisible(true);

}

}