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

public class GraphicsDemo implements Runnable {

	private class Surface extends JPanel implements ActionListener {
		
		int width = -1, height;
		double radiusTime = 0.0;
		
		private class MyMouseListener extends MouseAdapter {
			@Override
			public void mouseClicked(MouseEvent e) {
				width = e.getX();
				height = e.getY();
				repaint();
			}
		}
		
		
		public Surface() {
			setBackground(Color.WHITE);
			setPreferredSize(new Dimension(500,500));
			
			addMouseListener(new MyMouseListener());
			Timer timer = new Timer(100, this);
			timer.start();
		}
		
		@Override
		public void paintComponent(Graphics g) {
			g.clearRect(0,0,getWidth(),getHeight());
			if (width == -1) {
				width = getWidth();
				height = getHeight();
			}
			for (int i = 0; i < width; i += 5) {
				g.drawLine(0, 0, i, height - 1);
			}
			
			int ovalw = (int)(0.5 * (Math.sin(radiusTime) + 1.0) * width);
			int ovalh = (int)(0.5 * (Math.sin(radiusTime) + 1.0) * height);
			g.fillOval(width/2  - ovalw/2, height/2 - ovalh/2, ovalw, ovalh);
			
		}

		@Override
		public void actionPerformed(ActionEvent e) {
			radiusTime += 0.1;
			repaint();
		}
	}
	
	public static void main(String[] args) {
        SwingUtilities.invokeLater(new GraphicsDemo());
	}

	@Override
	public void run() {
	      JFrame frame = new JFrame("GraphicsDemo");
	      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	      Surface surface = new Surface();
	      frame.add(surface);
	      
	      frame.pack();
	      frame.setVisible(true);
		
	}

}