// BasicGraphicsWithTimer.java

// Same as BasicGraphics.java, but with a Timer for animation!

// A simple shell for drawing graphics as described in our textbook.
// Note that this is an *application* whereas the book uses *applets*.
// This should have little impact on you, however.

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

public class BasicGraphicsWithTimer extends JComponent
                                    implements ActionListener {
   
   public static void main(String[] args) {
      JComponent myGraphics = new BasicGraphicsWithTimer(); // Your class name goes here!
      launch(myGraphics, 500, 300); // Set the initial dimensions here!
   }
   
   public void onTimer() {
      // PUT YOUR ANIMATION CODE HERE
      // For example:
      circleX = (circleX + 5) % getWidth();
   }
   
   public void paint(Graphics page) {
      if (this.timer == null) {
        // start the timer the first time paint is called!
        int timerMillis = 1; // # of milliseconds between timer calls
        timer = new javax.swing.Timer(timerMillis, this);
        timer.start();
      }
      
      int width = getWidth();
      int height = getHeight();

      // paint a blue rectangle as large as the window      
      page.setColor(Color.blue);
      page.fillRect(0,0,width,height);
      
      // paint a yellow circle at location x,y
      page.setColor(Color.yellow);
      page.fillOval(circleX, circleY, 50, 50);
   }

   public void actionPerformed(ActionEvent e) {
      onTimer();
      repaint();
   }
   
   private javax.swing.Timer timer;
   private int circleX, circleY;

   //////////////////////////////////////////////////////////////////////////////
   /////////////////           END OF YOUR CODE             /////////////////////
   /////////////////  (you may ignore all the code below!!! /////////////////////
   //////////////////////////////////////////////////////////////////////////////

   public static void launch(JComponent jc, int width, int height) {
      JFrame frame = new JFrame(jc.getClass().getName());
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      JPanel cp = new JPanel();
      cp.setLayout(new BorderLayout());
      cp.add(jc);
      frame.setContentPane(cp);
      frame.setSize(new Dimension(width,height));
      frame.setVisible(true);
   }
}