/**
	MVC?programming
	G.?Volger
	12.9.04
	
	This?is?the?Model?-?CheckerBoard.java
	
	The?model?（CheckerGame）?the?view?（CheckersView）?and?the?controller
	（Checkers）?are?in?separate?files.??When?the?model?changes?the?view?is
	notified?and?updated?automatically.
*/

/*
	The?checker?board?is?an?8?x?8?grid?with?the?top?left?corner?being?
	a?white?square.??All?pieces?（White?&?Green）?reside?on?black?squares.
	Red?squares?are?never?occupied.
*/

import?java.util.Observable;

public?class?CheckerBoard?//?NEED?TO?EXTEND?A?CLASS?TO?MAKE?MVC?WORK
{
	private?int?board[][];
	private?int?BOARD_SIZE?=?8;
	private?int?EMPTY?=?0;
	private?static?int?Player_ONE?=?1;
	private?static?int?Player_TWO?=?2;
	private?static?int?KING_ME?=?2;
	
	/**
	?*	Creates?an?checkerboard?with?all?the?pieces?in?their?starting?places.
	?*/
	public?CheckerBoard（）
	{
		board?=?new?int[BOARD_SIZE][BOARD_SIZE];
		clearBoard（）;
		setPlayers（）;
	}
	
	/**
		Sets?all?the?board?locations?to?empty
	*/
	private?void?clearBoard（）
	{
		for?（int?r?=?0;?r?			for?（int?c?=?0;?c?				board[r][c]?=?EMPTY;
	}
	
	/**
	?*	Places?the?check?board?pieces?in?their?starting?locations
	?*/
	private?void?setPlayers（）
	{
		//?Top?player?pieces?in?first?three?rows
		for?（int?r?=?0;?r?		{
			int?start;
			if?（?r?%?2?==?0）
				start?=?1;
			else
				start?=?0;
			for?（int?c?=?start;?c?			{
				board[r][c]?=?Player_ONE;
			}
		}
		//?Bottom?player?pieces?in?bottom?three?rows
		for?（int?r?=?BOARD_SIZE?-?3;?r?
		{
			int?start;
			if?（?r?%?2?==?0）
				start?=?1;
			else
				start?=?0;
			for?（int?c?=?start;?c?
			{
				board[r][c]?=?Player_TWO;
			}
		}
	}
	
	/**
		Returns?true?if?r?&?c?are?within?the?board
		@param?r?row?location?of?checkerboard
		@param?c?column?location?of?checkerboard
		@return?returns?true?if?r?&?c?are?valid?locations?in?the?checkerboard
	*/
	public?boolean?validLocation（int?r?int?c）
	{
		if?（r?=?BOARD_SIZE?||?c?=?BOARD_SIZE）
			return?false;
		return?true;
	}
	
	/**
		Black?squares?can?be?found?in
			Even?Row?&?Odd?Column
			Odd?Row?&?Even?Column
		@param?r?row?location?of?checkerboard
		@param?c?column?location?of?checkerboard
		@return?returns?true?if?location?（rc）?is?a?black?square?on?the?checkerboard
	*/
	public?boolean?blackSqaure（int?r?int?c）
	{
		if?（!validLocation（r?c））
			return?false;
		if?（r?%?2?==?0）
			return?（c?%?2?!=?0）;
		return?（c?%?2?==?0）;
	}
	
	/**
		@param?r?row?location?of?checkerboard
		@param?c?column?location?of?checkerboard
		@return?returns?true?is?there?is?a?checker?piece?on?the?grid?location?（rc）
		????????otherwise?returns?false
	*/
	public?boolean?sqaureOccupied（int?r?int?c）
	{
		if?（!validLocation（rc））
			return?false;
		return?board[r][c]?!=?EMPTY;
	}
	
	/**
		@param?myRow?row?location?of?checkerboard
		@param?myCol?column?location?of?checkerboard
		@param?oppRow?row?location?of?checkerboard
		@param?oppCol?column?location?of?checke

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2014-03-03?10:39??Checker\
?????文件?????????295??2014-02-02?17:34??Checker\.classpath
?????文件????????6148??2014-03-13?20:56??Checker\.DS_Store
?????目錄???????????0??2014-03-13?20:56??__MACOSX\
?????目錄???????????0??2014-03-13?20:56??__MACOSX\Checker\
?????文件?????????120??2014-03-13?20:56??__MACOSX\Checker\._.DS_Store
?????文件?????????366??2014-02-02?17:34??Checker\.project
?????目錄???????????0??2014-02-02?17:34??Checker\.settings\
?????文件?????????587??2014-02-02?17:34??Checker\.settings\org.eclipse.jdt.core.prefs
?????目錄???????????0??2014-02-13?17:52??Checker\bin\
?????目錄???????????0??2014-02-13?17:52??Checker\bin\application\
?????文件????????1763??2014-02-13?17:52??Checker\bin\application\CheckerBoard.class
?????文件????????1400??2014-02-13?17:52??Checker\bin\application\Checkers.class
?????文件????????1749??2014-02-13?17:52??Checker\bin\application\CheckersView.class
?????目錄???????????0??2014-03-03?10:39??Checker\src\
?????文件????????6148??2014-03-13?20:56??Checker\src\.DS_Store
?????目錄???????????0??2014-03-13?20:56??__MACOSX\Checker\src\
?????文件?????????120??2014-03-13?20:56??__MACOSX\Checker\src\._.DS_Store
?????目錄???????????0??2014-02-02?17:41??Checker\src\application\
?????文件????????9811??2014-02-02?17:40??Checker\src\application\CheckerBoard.java
?????文件????????3190??2014-02-02?17:41??Checker\src\application\Checkers.java
?????文件????????4291??2014-02-02?17:41??Checker\src\application\CheckersView.java