tesuji.games.go.computer.tactics
Class Ladder

java.lang.Object
  |
  +--tesuji.games.go.computer.tactics.Ladder
All Implemented Interfaces:
BoardChangeListener, java.util.EventListener

public class Ladder
extends java.lang.Object
implements BoardChangeListener

Module for reading ladders, also called 2-liberty problems.

Creation date: (17-May-01 11:30:46 PM)

Product: Tesuji Software Go Library.

Copyright (c) 2001 Tesuji Software B.V.
All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, provided that the above copyright notice(s) and this permission notice appear in all copies of the Software and that both the above copyright notice(s) and this permission notice appear in supporting documentation.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of a Tesuji Software shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization of Tesuji Software.


Field Summary
static byte CAN_CATCH
           
static byte CANNOT_CATCH
           
static byte CATCH_WITH_KO
           
static byte ILLEGAL
           
 
Constructor Summary
Ladder(int boardSize)
           
 
Method Summary
 void addGameEventListener(GameEventListener l)
          Register an event listener.
 void changeBoard(int x, int y, byte value, byte oldValue)
           
 int getLastLadderMove()
           
 int getNrMovesRead()
          

Creation date: (17-May-01 11:44:44 PM)

 void removeGameEventListener(GameEventListener l)
           
static void testLadders(GameEventListener l)
           
 int tryEscape(int xy)
          Try to escape from a ladder with a stone or chain that has one liberty.

The values returned are CAN_CATCH if it can't escape, CANNOT_CATCH if it can escape and CATCH_WITH_KO if there's a ko involved.
 int tryEscape(int x, int y)
          Try to escape from a ladder with a stone or chain that has one liberty.

The values returned are CAN_CATCH if it can't escape, CANNOT_CATCH if it can escape and CATCH_WITH_KO if there's a ko involved.
 int tryLadder(int xy)
          Try catching a stone in a ladder.
 int tryLadder(int x, int y)
          Try catching a stone in a ladder.
 int wouldBeLadder(int xy, byte color)
          See if a move at a certain point would be immediately captured in a ladder.
 int wouldBeLadder(int x, int y, byte color)
          See if a move at a certain point would be immediately captured in a ladder.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

CANNOT_CATCH

public static final byte CANNOT_CATCH

CAN_CATCH

public static final byte CAN_CATCH

ILLEGAL

public static final byte ILLEGAL

CATCH_WITH_KO

public static final byte CATCH_WITH_KO
Constructor Detail

Ladder

public Ladder(int boardSize)
Method Detail

addGameEventListener

public void addGameEventListener(GameEventListener l)
Register an event listener. Any change of the board during reading gets sent here which is good for debugging or for flashing the ladders on the screen.

Creation date: (17-May-01 11:42:45 PM)


changeBoard

public void changeBoard(int x,
                        int y,
                        byte value,
                        byte oldValue)
Specified by:
changeBoard in interface BoardChangeListener

getLastLadderMove

public int getLastLadderMove()

getNrMovesRead

public int getNrMovesRead()


Creation date: (17-May-01 11:44:44 PM)


removeGameEventListener

public void removeGameEventListener(GameEventListener l)

testLadders

public static void testLadders(GameEventListener l)

tryEscape

public int tryEscape(int xy)
Try to escape from a ladder with a stone or chain that has one liberty.

The values returned are CAN_CATCH if it can't escape, CANNOT_CATCH if it can escape and CATCH_WITH_KO if there's a ko involved.

Creation date: (17-May-01 11:22:53 PM)


tryEscape

public int tryEscape(int x,
                     int y)
Try to escape from a ladder with a stone or chain that has one liberty.

The values returned are CAN_CATCH if it can't escape, CANNOT_CATCH if it can escape and CATCH_WITH_KO if there's a ko involved.

Creation date: (17-May-01 11:22:53 PM)


tryLadder

public int tryLadder(int xy)
Try catching a stone in a ladder. A ladder is defined as a chain with two liberties which can be caught by continuously filling a liberty until the chain can't make more than one liberty in reply. If the chain ever makes three liberties, or two with the other player to move it's considered to have escaped. Possible values are CAN_CATCH, CANNOT_CATCH or CATCH_WITH_KO

Creation date: (10-May-01 3:52:14 PM)


tryLadder

public int tryLadder(int x,
                     int y)
Try catching a stone in a ladder. A ladder is defined as a chain with two liberties which can be caught by continuously filling a liberty until the chain can't make more than one liberty in reply. If the chain ever makes three liberties, or two with the other player to move it's considered to have escaped. Possible values are CAN_CATCH, CANNOT_CATCH or CATCH_WITH_KO

Creation date: (10-May-01 3:52:14 PM)


wouldBeLadder

public int wouldBeLadder(int xy,
                         byte color)
See if a move at a certain point would be immediately captured in a ladder.

Creation date: (09-May-01 7:27:58 PM)


wouldBeLadder

public int wouldBeLadder(int x,
                         int y,
                         byte color)
See if a move at a certain point would be immediately captured in a ladder.

Creation date: (09-May-01 7:27:58 PM)