/*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
  File:    GraphicsExampleFrame3WithKeyboardInput.java
  Date:    5/22/2006
  Author:  mr. Hanley
  Purpose: Demonstrate how to add keyboard interaction

 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
import java.awt.*;
import javax.swing.*;
import javax.imageio.*; //Utilities for working with images
import java.awt.image.*;
import java.io.*;
import java.awt.event.*;

public class GraphicsExampleFrame3WithKeyboardInput
    extends JFrame implements KeyListener
{
  BufferedImage image1; //This is an image variable
  BufferedImage img = new BufferedImage(500, 400, BufferedImage.TYPE_INT_ARGB);
  int x = 8, y = 38;
  int velocity = 4; //how fast plane moves from left to right

  boolean leftDown, rightDown; //true if left cursor key down and right cursor
  //key down respectively

  public void keyPressed(KeyEvent k)
  {
    if (k.getKeyCode() == k.VK_RIGHT)
    {
      rightDown = true;
    }

    if (k.getKeyCode() == k.VK_LEFT)
    {
      leftDown = true;
    }
  }

  public void keyTyped(KeyEvent k)
  {}

  public void keyReleased(KeyEvent k)
  {
    if (k.getKeyCode() == k.VK_RIGHT)
    {
      rightDown = false;
    }
    if (k.getKeyCode() == k.VK_LEFT)
    {
      leftDown = false;
    }
  }



  /*****************************************************************
   *    public GraphicsExampleFrame2WithLoadingImage()
   * pre:
   * post:  attempts to load image into variable image1
   *
   *****************************************************************/

  public GraphicsExampleFrame3WithKeyboardInput()
  {
    try
    {
      image1 = ImageIO.read(new File("images/kipper.gif"));
    }
    catch (java.io.IOException e)
    {
      System.out.println(e);
    }
    addKeyListener(this);
  }

  public void update(Graphics g)
  {
    paint(img.getGraphics());
    g.drawImage(img, 0, 0, null);

  }

  public void paint(Graphics g)
  {
    if (rightDown)
      if (velocity < 15)
        velocity++;
    if (leftDown)
     if (velocity >=  1)
       velocity--;



    g.fillRect(0, 0, 500, 400);


    x += velocity;

    //draw the image
    g.drawImage(image1, x, y, null);

    //Draw the image to the screen
    g.drawImage(img, 0, 0, null);

    if(x>=500) x=0;

    //Pause
    try
    {
      Thread.sleep(100);
    }
    catch (InterruptedException e)
    {
      Thread.currentThread().interrupt();
    }
    //Invoke repaint
    repaint();

  }

}