//Field.java
//A GUI element displayed on the Chess applet. An extended version of
//GoodButotn that can keep track of pieces but other than that has no
//analytical methods

//public int col, row;     range from 1 to 8
//private Piece piece;     reference to piece that stands on this square , null if square empty
//
//constructor - public Square(Color c, int w, int h, int col, int row)
//(first 3 parameters - fot the GoodButton constructor)
//only this GoodButtoon's constructor is used so far
//user must take care to give correct col, row 
//
//presents to the user methods: 
//public String coords()   returns its coordinates as "a1","h8", etc.
//public void setPiece(Piece p) puts the given piece on this square, drawing its image
//public void Piece getPiece()  returns the piece, null if none
//public void clearPiece()      sets piece to null regardess of current content
//
//Methods setPiece() and clearPiece() are should only be accessed by Piece
//class. DO NOT attempt to call them directly!

import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class Field extends GoodButton
{
   public int col, row;
   public Piece piece = null;
      
   //range from 1 to 8
   public Field(int col, int row)
   {
      super(Color.green,33,33);        //Color.green is just to feed some color to super() before we find what it really should be
      String s = properColor(col,row); //"white/black"
      Color c = (s.equals("white")) ? Colors.dwsquare : Colors.dbsquare;
      resetColor(c);  //inherited from GoodButton 
      this.col = col; this.row = row;
   }
   
   //receives coordinates in one string like "a1", etc. String must have the right format
   public Field(String nm)
   {
      super(Color.green,33,33);        //Color.green is just to feed some color to super() before we find what it really should be
      int col = (int) (nm.charAt(0) - 'a' + 1);
      int row = (int) (nm.charAt(1) - '1' + 1); 
      String s = properColor(col,row); //"white/black"
      Color c = (s.equals("white")) ? Colors.dwsquare : Colors.dbsquare;
      resetColor(c);  //inherited from GoodButton 
      this.col = col; this.row = row;
      
   }
   
   public Field(Color c, int col, int row)
   {
      super(c,33,33);
      this.col = col; this.row = row;
   }
   
   public Field(Color c, int w, int h, int col, int row)
   {
      super(c,w,h);
      this.col = col; this.row = row;
   }
   
	/*public void paint(Graphics g)
	{
		removeImage();
		if (piece != null) paintImage(piece.getShape(),piece.getColor());
	}*/

   //put the specified piece on this square
   public void setPiece(Piece p) 
   {
      removeImage();   //from GoodButton; delete whatever may be currently displayed 
      if (p != null) paintImage(p.getShape(),p.getColor()); //from GoodButton; draw the shape of this piece
      rememberPiece(p);       //remember the piece that I am holding now
   }
   
   public void rememberPiece(Piece p) {piece = p;} 
   
   public Piece getPiece() {return piece;}
   public void clearPiece() {piece = null;}
   
   public String coords() {return "" + (char)('a' + col - 1) + row;}
  
   public int getCol() {return col;}
   public int getRow() {return row;}
   public boolean empty() {if (piece == null) return true; else return false;}
   
   //determines which color i ought to have based on my coordinates
   private String properColor(int col, int row)
   {
      if ((col==1) || (col==3) || (col==5) || (col==7)) //a,c,e,g file
         if ((row==1) || (row==3) || (row==5) || (row==7)) return "black"; 
         else return "white";
      else //b,d,f,h file
         if ((row==1) || (row==3) || (row==5) || (row==7)) return "white";
         else return "black";     
   }
   
   private boolean onBoard(int i, int j)
   {
      if ((i < 1) || (i > 8) || (j < 1) || (j > 8)) return false; else return true; 
   }
   
}
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