Android Open Source - android-chess Pos

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License

The source code is released under:

MIT License

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Java Source Code

package jwtc.chess;
//w w  w .j a  v a  2s. c  o m
// Pos - Wrapper class for a position or square on the board
// Provides only static methods
// A position is an integer between 0 and 63 for the 64 squares
// This part of the code is given under Pos to "free up" some lines in ChessBoard.
// In ChessBoard all other positional related stuff is done

public class Pos
{
  // returns positional value [0-63] for squares [a8-h1]
  // when a position cannot be created a message is sent on console out (co).
  // used to initialize values, no speed needed
  public static int fromString(final String s)
  {
    //if(s.length() != 2)
    //  co.pl("Cannot create Pos from: " + s);
    char c = s.charAt(0);
    //if(c < 'a' || c > 'h')  
    //  co.pl("Cannot create Pos from: " + c);
    int col, row = Integer.parseInt(s.substring(1));
    col = (int)c - (int)'a';
    
    return ((8-row) * 8) + col;
  }

  // returns positional value [0-63] from a column and row.
  // @col the column [0-7] (left to right)
  // @row the row [0-7] (top to bottom)
  // no check for invalid row or col is done for reasons of speed
  public static final int fromColAndRow(final int col, final int row)
  {
    return (row * 8) + col;
  }
  
  // returns the row [0-7] from top to bottom; ie values in [a8-h8] return 0.
  public static int row(final int val)
  {
    return (val >> 3) & 7;
  }
  //  returns the column [0-7] from left to right; ie values in [a8-a8] return 0.
  public static int col(final int val)
  {
    return val % 8;
  }

  // returns string representation of the value; ie "d5"
  // @val positional value [0-63] - no check on valid range
  public static String toString(final int val)
  {
    return "" + ((char)(Pos.col(val) + (int)'a')) + "" + (8-Pos.row(val));
  }
  
  // returns string representation of the row of val - human represented so from bottom to top ["1"-"8"]
  public static String rowToString(final int val)
  {
    return "" + (8-Pos.row(val));  
  }
  // returns string representation of the column. ["a"-"h"]
  public static String colToString(final int val)
  {
    return "" + ((char)(Pos.col(val) + (int)'a'));
  }
}

Java Source Code List