// Eyes Class
// Eyes.java

// Project 3, CIS 525
// Fall 2000
// By Terrence Burrows


// Imports
import java.awt.*;
import java.applet.Applet;
import java.util.*;

/** This is the class of the "Eyes" object - creatures that move
    back and forth in the game.  This class extends the "Sprite"
    class.  It sets the initial location and behavior of the "eyes"
    bitmaps in the game.  It also initializes the eye images.
    This class overrides the Sprite class "update" and "incframe"
    methods.  */
public class Eyes extends Sprite {
  /** "Eye" image frame array */
  protected static Image[][]  image = new Image[2][4];
  /** "Eye" blink rate and trigger variables */
  protected int               blinkDelay,
                              blinkTrigger;
  /** Random number generator */
  private static Random   rand = new
    Random(System.currentTimeMillis());

  /** Eye class constructor method - set eye initial location
      and "blink" rate.  */
  public Eyes (Component comp, int dir, int speedInc, int bd) {
    super(comp, image[dir], 0, 1, 1, new Point((dir == 0) ?
      (comp.size().width - image[dir][0].getWidth(comp)) : 0,
      60 + Math.abs(rand.nextInt() % 5) * 44), new Point((dir == 0)
      ? (-5 - speedInc) : (5 + speedInc), 0), 10,
      Sprite.BA_DIE);
    blinkTrigger = blinkDelay = bd;
  }

  /** Initialize Resources - get bitmap images and synchronize with
      the Media Tracker. */
  public static void initResources(Applet app, MediaTracker tracker,
    int id) {
    for (int i = 0; i < 4; i++) {
      image[0][i] = app.getImage(app.getCodeBase(), "Res/SmEye" +
        i + ".gif");
      tracker.addImage(image[0][i], id);
      image[1][i] = app.getImage(app.getCodeBase(), "Res/LgEye" +
        i + ".gif");
      tracker.addImage(image[1][i], id);
    }
  }

  /** Set the collision boundary rectangle for the image.  Also
      used for determining coordinates for the isPointInside()
      method in the Sprite class. */
  protected void setCollision() {
    collision = new Rectangle(position.x, position.y,
      position.width, position.height);
  }

  /** See if the "Eye" bitmap image escaped the screen.  ***This
      will increment the "lost" counter in the NightHunter class.
      This is not A very object oriented like approach. */
  public BitSet update() {
    // See if the eye escaped the screen
    BitSet action = super.update();
    if (action.get(Sprite.SA_KILL))
      NightHunter.lost++;   //increment "lost" counter in NightHunter class
    return action;          //object
  }

  /** Increment image frames and set frames to synchronize
      with the "blink" delay. */
  protected void incFrame() {
    if ((frameDelay > 0) && (--frameTrigger <= 0) &&
      (--blinkTrigger <= 0)) {
      // Reset the frame trigger
      frameTrigger = frameDelay;

      // Increment the frame
      frame += frameInc;
      if (frame >= 4) {
        frame = 3;
        frameInc = -1;
      }
      else if (frame <= 0) {
        frame = 0;
        frameInc = 1;
        blinkTrigger = blinkDelay;
      }
    }
  }
}