import java.applet.*;
import java.awt.*;
import java.awt.event.*;


public class Kaleidoscope extends Applet implements ActionListener, Runnable {

  private volatile Thread tickThread = null;
  private boolean isRunning;

  private KaleidoscopeCanvas kaleidoscopeCanvas;
  private Checkbox rectangleCheckbox, squareCheckbox, ellipseCheckbox, circleCheckbox, triangleCheckbox;
  private Button startStopButton;


  public void init() {

    isRunning = false;

    setLayout(new BorderLayout());

    Panel shapePanel = new Panel();

      rectangleCheckbox = new Checkbox("Rectangle");
      shapePanel.add(rectangleCheckbox);

      squareCheckbox = new Checkbox("Square");
      shapePanel.add(squareCheckbox);

      ellipseCheckbox = new Checkbox("Ellipse");
      shapePanel.add(ellipseCheckbox);

      circleCheckbox = new Checkbox("Circle");
      shapePanel.add(circleCheckbox);

      triangleCheckbox = new Checkbox("Triangle");
      shapePanel.add(triangleCheckbox);

      startStopButton = new Button("Start");
      startStopButton.addActionListener(this);
      shapePanel.add(startStopButton);

    add(shapePanel, BorderLayout.NORTH);

    kaleidoscopeCanvas = new KaleidoscopeCanvas();
    add(kaleidoscopeCanvas, BorderLayout.CENTER);
  }


  // start a thread : You should leave this method be
  public void start() {

    if ((isRunning) && (tickThread == null)) {
      tickThread = new Thread(this);
      tickThread.start();
    }
  }


  // run a thread and update every X milliseconds
  public void run() {

    Thread myThread = Thread.currentThread();
    while (tickThread == myThread) {

//
// THIS IS the point where you can generate random shapes, and pass each random shape to the canvas for painting.
// A Kaleidoscope should ideally have 4 or 8 mirrored images of the same object. So, if you generate a circle at
// position (100,100) in an 800x600 screen, then the same circle should also appear at position (700,100),
// (100,500), and (700,500)
// It is up to you how you would like to implement this functionality. You can make 4 calls here, and assume the
// applet's preset size, e.g. 800x600.
// When generating random shapes, make sure that you are only using shapes that have been selected in the UI!
// 
      kaleidoscopeCanvas.drawShape();
//
//
//

      try {
        // updates every 100 milliseconds
        Thread.sleep(100);
      } catch (InterruptedException e) {
      }
    }
  }


  // listen for Start/Stop action: You should leave this method be
  public void actionPerformed(ActionEvent e) {

    if (isRunning) {
      isRunning = false;
      tickThread = null;
      startStopButton.setLabel("Start");
    } else {
      isRunning = true;
      startStopButton.setLabel("Stop");
      start();
    }
  }
}