import java.applet.Applet;
import java.awt.*;

class BlinkingShape implements Blinkable {
  int x, y;
  Applet applet;
  float blinkingRate = MAXRATE;
  int laptime = (int) (1/blinkingRate);
  private Thread blinker = null;
  boolean isVisibleQ = true;

  int randomNumber(int low, int high) {
    return ((int) (low + Math.random()*(high-low)));
  }

  void randomize() {
    laptime = randomNumber(500,2000);
    setBlinkingRate((float) 1/laptime);
    laptime = (int) (1/blinkingRate);
    x = randomNumber(20,100);
    y = randomNumber(40,120);
  }

  public void draw(Graphics g) {}

  public void run () {
    while (blinker != null) {
      applet.repaint();
      try {
        Thread.sleep(laptime/2);
      }
      catch (InterruptedException e) {
        break;
      }
      isVisibleQ = !isVisibleQ;
    }
  }

  public void startBlinking () {
    if ( blinker == null) {
      blinker = new Thread(this);
      blinker.start();
    }
  }

  public void stopBlinking () {
    if (blinker != null) {
      blinker.stop();
    }
    blinker = null;
  }

  public float getBlinkingRate () {
    return blinkingRate;
  }

  public void setBlinkingRate (float r) {
    blinkingRate = Math.max(MINRATE, Math.min(r, MAXRATE));
  }
}