/* The following is the skeleton program for lab 6. You'll need to
   write classes for the goblin and the treasure, using the human
   class as a guide. Then, you should modify the animate function of 
   the public class goblinapp.  

   The animated gifs are located at /shared/csc/local/stuff/ on Hofstra
   Solaris computers.
*/

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

public class goblinapp extends JFrame implements KeyListener
{
  private Graphics brush;
  private Graphics display;
  private Image canvas;    // off-screen graphics buffer
  private human professor;  // professor object - don't redefine!

  private static final Color bkcolor = Color.black; //background color
  private static final int XBOUND = 800;   // width of window
  private static final int YBOUND = 600;   // height of window
  private static final int STEP = 4;       // movement default step
  private static final int FDELAY = 30;    // animation frame delay

  public static void main(String[] args) // needed for application
  {
    goblinapp session  = new goblinapp();
    session.addWindowListener(new WindowAdapter() {
              public void windowClosing(WindowEvent e) {System.exit(0);} });
    session.init();
  }

   public void paint(Graphics g) {}  // overrides auto-update

   public void init()
    {
       setBounds(0,0,XBOUND,YBOUND);
       show();
       canvas = createImage(XBOUND,YBOUND);
       brush = canvas.getGraphics();
       display = this.getGraphics();
       brush.setColor(bkcolor);             // clear 
       brush.fillRect(0,0,XBOUND,YBOUND);   // with black background
       brush.setColor(Color.blue);  
       addKeyListener(this);
       requestFocus();		// keys go to applet
       animate();
    } // init

   public void clearbuffer()
    { Color old;
      old = brush.getColor();
      brush.setColor(bkcolor);   // clear 
      brush.fillRect(0,0,XBOUND,YBOUND);   // with black background
      brush.setColor(old);   //  restores color
    } // clearbuffer

   public void nextframe(int delay) // delay in ms
    {
       try { Thread.sleep(delay); } catch (InterruptedException IE) {}
       display.drawImage(canvas,0,0,null);  // draws to screen
       clearbuffer();
    } // nextframe with ms delay


    // event handling: respond to key strokes
   public void keyReleased(KeyEvent e) {}
   public void keyTyped(KeyEvent e) {}
   public void keyPressed(KeyEvent e)
    { int key = e.getKeyCode();       // key pressed
      if (key == KeyEvent.VK_UP) 
	  professor.setdirection(0,-1*STEP);  // move up
      if (key == KeyEvent.VK_DOWN) 
	  professor.setdirection(0,STEP);
      if (key == KeyEvent.VK_LEFT) 
	  professor.setdirection(-1*STEP,0);
      if (key == KeyEvent.VK_RIGHT) 
	  professor.setdirection(STEP,0);
      if (key == KeyEvent.VK_SPACE)
	  professor.setdirection(0,0);  // stop
      // else do nothing - direction remains the same
    }

    /* ----------------******************------------------ */

   public void animate()
    {
       int x1, y1, x2, y2;  // temp variables you might need
       boolean stop;  // controls when loop stops
       stop = false;
       professor = new human(XBOUND-50, YBOUND-50,brush);

       // create other objects here, you can declare the variables 
       // either above, inside the class, or here locally, just don't
       // declare them twice!

       try {Thread.sleep(1000);} catch (Exception ee) {} // wait 1 second
       while (stop == false)  
	   {  
	       // catch the professor!
	       professor.move();
	       nextframe(FDELAY);
	       // set stop to true when it's time to exit the loop
           }

       /* Use the following lines to display a message when game over:
           display.setFont(new Font("Serif",Font.BOLD,24));
           display.setColor(Color.red);
           display.drawString("The Professor Wins!",XBOUND/2-100,YBOUND/2);
       */

    } // animate
} // class goblinapp


/* ************************************************* */

class human
{
   private Image img;   // animated gif
   private int xcord, ycord;        // coordinates of center
   private int dx, dy;   // movement vector
   private Graphics brush;
   private int radius;
   private static final int XBOUND = 800;
   private static final int YBOUND = 600;   

    // accessor methods
    public int getx() { return xcord; }
    public int gety() { return ycord; }
    public int getr() { return radius; }
    public int getdx() { return dx; }
    public int getdy() { return dy; }
   
   public human(int x0, int y0, Graphics b0)  // constructor
    { 
      xcord = x0;
      ycord = y0;
      // change the following to correct location of file:
      img = Toolkit.getDefaultToolkit().getImage("/shared/csc/local/stuff/man15.gif");
      radius = 15;   // may need to fine-tune
      brush = b0;
    }

    public void draw()
    {
	brush.drawImage(img,xcord-radius,ycord-radius,null);
	//brush.drawOval(xcord-radius,ycord-radius,2*radius,2*radius);
    }   

    public void setdirection(int newdx, int newdy)
    {  
	dx = newdx;
	dy = newdy;
    }

    public void move()   // will wrap around edges of window
    {
	xcord = xcord + dx;
	if (xcord < radius/2) xcord = XBOUND-(radius/2);
	if (xcord > XBOUND-(radius/2)) xcord = radius/2;
	ycord = ycord + dy;
	if (ycord < radius/2) ycord = YBOUND-(radius/2);
	if (ycord > YBOUND-(radius/2)) ycord = radius/2;
	draw();
    }
    
} // end class human


/* create classes for the goblin and the diamond/treasure here */