import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.text.*;

/**
 * A class that represents a picture.  This class inherits from 
 * SimplePicture and allows the student to add functionality to
 * the Picture class.  
 * 
 * Copyright Georgia Institute of Technology 2004-2005
 * @author Barbara Ericson ericson@cc.gatech.edu
 */
public class Picture extends SimplePicture 
{
  ///////////////////// constructors //////////////////////////////////
  
  /**
   * Constructor that takes no arguments 
   */
  public Picture ()
  {
    /* not needed but use it to show students the implicit call to super()
     * child constructors always call a parent constructor 
     */
    super();  
  }
  
  /**
   * Constructor that takes a file name and creates the picture 
   * @param fileName the name of the file to create the picture from
   */
  public Picture(String fileName)
  {
    // let the parent class handle this fileName
    super(fileName);
  }
  
  /**
   * Constructor that takes the width and height
   * @param width the width of the desired picture
   * @param height the height of the desired picture
   */
  public Picture(int width, int height)
  {
    // let the parent class handle this width and height
    super(width,height);
  }
  
  /**
   * Constructor that takes a picture and creates a 
   * copy of that picture
   */
  public Picture(Picture copyPicture)
  {
    // let the parent class do the copy
    super(copyPicture);
  }
  
  ////////////////////// methods ///////////////////////////////////////
  
  /**
   * Method to return a string with information about this picture.
   * @return a string with information about the picture such as fileName,
   * height and width.
   */
  public String toString()
  {
    String output = "Picture, filename " + getFileName() + 
      " height " + getHeight() 
      + " width " + getWidth();
    return output;
  }
  
  // ***** CHROMAKEY ------------------------------------------------
  
  public void chromakeyOnBlue( Picture newBackground )
  {
    int red, green, blue;
    int x, y;
    Pixel newPixel;
    
    for ( Pixel currentPixel : this.getPixels() )
    {
      red   = currentPixel.getRed();
      green = currentPixel.getGreen();
      blue  = currentPixel.getBlue();
      
      if ( red + green < blue )
      {
        x = currentPixel.getX();
        y = currentPixel.getY();
        newPixel = newBackground.getPixel( x, y );
        currentPixel.setColor( newPixel.getColor() );
      }
    }
  }

  // ***** CHROMAKEY, take 2 ----------------------------------------
  
//  public void chromakeyOnBlue( Picture newBackground )
//  {
//    int x, y;
//    Pixel newPixel;
//    
//    for ( Pixel currentPixel : this.getPixels() )
//    {
//      if ( isBlue(currentPixel) )
//      {
//        x = currentPixel.getX();
//        y = currentPixel.getY();
//        newPixel = newBackground.getPixel( x, y );
//        currentPixel.setColor( newPixel.getColor() );
//      }
//    }
//  }
//  
//  public boolean isBlue( Pixel p )
//  {
//    int red   = p.getRed();
//    int green = p.getGreen();
//    int blue  = p.getBlue();
//    
//    return red + green < blue;
//  }
  
  // ***** helper methods -------------------------------------------
  
  // ***** test method ----------------------------------------------

} // end of class Picture, put all new methods before this