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/***************************************************************************
* Copyright (C) 2002-2003 Andi Peredri *
* andi@ukr.net *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
// aw?1 - due to english rules a man reaching the king-row becomes a king
// and the is complete.
//
// English Checkers
#include "echeckers.h"
///////////////////////////////////////////////////
//
// Player Functions
//
///////////////////////////////////////////////////
bool ECheckers::go1(int from, int field)
{
from=internal(from);
field=internal(field);
to=field;
if(checkCapture1()) {
bool capture=false;
switch(board[from]) {
case MAN1:
if(manCapture1(from, UL, capture)) return true;
if(manCapture1(from, UR, capture)) return true;
return false;
case KING1:
if(kingCapture1(from, UL, capture)) return true;
if(kingCapture1(from, UR, capture)) return true;
if(kingCapture1(from, DL, capture)) return true;
if(kingCapture1(from, DR, capture)) return true;
return false;
}
} else {
switch(board[from]) {
case MAN1:
if((to==(from-6))||(to==(from-5))) {
board[from]=FREE;
if(to<10)
board[to]=KING1;
else
board[to]=MAN1;
return true;
}
return false;
case KING1:
if((to==(from-6))||(to==(from-5)) ||
(to==(from+5))||(to==(from+6)) ) {
board[from]=FREE;
board[to]=KING1;
return true;
}
return false;
}
}
return false;
}
bool ECheckers::checkCapture1() const
{
for(int i=6;i<48;i++)
if(checkCapture1(i))
return true;
return false;
}
bool ECheckers::checkCapture1(int i) const
{
switch(board[i]) {
case MAN1:
// forward-left
if(board[i-6]==MAN2 || board[i-6]==KING2)
if(board[i-12]==FREE) return true;
// forward-right
if(board[i-5]==MAN2 || board[i-5]==KING2)
if(board[i-10]==FREE) return true;
break;
case KING1:
// forward-left
if(board[i-6]==MAN2 || board[i-6]==KING2)
if(board[i-12]==FREE) return true;
// forward-right
if(board[i-5]==MAN2 || board[i-5]==KING2)
if(board[i-10]==FREE) return true;
// backward-left
if(board[i+5]==MAN2 || board[i+5]==KING2)
if(board[i+10]==FREE) return true;
// backward-right
if(board[i+6]==MAN2 || board[i+6]==KING2)
if(board[i+12]==FREE) return true;
}
return false;
}
/* ORIG FUNC aw???
bool ECheckers::checkCapture1()
{
for(int i=6;i<48;i++) {
switch(board[i]) {
case MAN1:
// forward-left
if(board[i-6]==MAN2 || board[i-6]==KING2)
if(board[i-12]==FREE) return true;
// forward-right
if(board[i-5]==MAN2 || board[i-5]==KING2)
if(board[i-10]==FREE) return true;
break;
case KING1:
// forward-left
if(board[i-6]==MAN2 || board[i-6]==KING2)
if(board[i-12]==FREE) return true;
// forward-right
if(board[i-5]==MAN2 || board[i-5]==KING2)
if(board[i-10]==FREE) return true;
// backward-left
if(board[i+5]==MAN2 || board[i+5]==KING2)
if(board[i+10]==FREE) return true;
// backward-right
if(board[i+6]==MAN2 || board[i+6]==KING2)
if(board[i+12]==FREE) return true;
}
}
return false;
}
*/
// Return TRUE if a course of the player true
// Return FALSE if a course of the player incorrect
bool ECheckers::manCapture1(int from, int direction, bool& capture)
{
int i=from+direction;
if(board[i]==MAN2 || board[i]==KING2) {
int k=i+direction;
if(board[k]==FREE) {
bool next=false;
int save=board[i];
board[from]=FREE;
board[i]=NONE;
// become a king!
if(k<10) {
board[k]=KING1;
/*aw?1
if(kingCapture1(k, direction+11, next)) {
board[i]=FREE;
return true;
}
*/
} else {
board[k]=MAN1;
if(manCapture1(k,UL,next)) {board[i]=FREE; return true;}
if(manCapture1(k,UR,next)) {board[i]=FREE; return true;}
}
//?? make move here, too???
if((!next) && k==to) {board[i]=FREE; return true;}// move success
// move failed, restore
board[k]=FREE;
board[i]=save;
board[from]=MAN1;
capture=true;
}
}
return false;
}
bool ECheckers::kingCapture1(int from, int direction, bool& capture)
{
int i=from+direction;
if(board[i]==MAN2 || board[i]==KING2)
{
int k=i+direction;
if(board[k]==FREE)
{
bool next=false;
int save=board[i];
board[from]=FREE;
board[i]=NONE;
board[k]=KING1;
if(direction==UL || direction==DR) {
if(kingCapture1(k,UR,next)) {board[i]=FREE;return true;}
if(kingCapture1(k,DL,next)) {board[i]=FREE;return true;}
} else {
if(kingCapture1(k,UL,next)) {board[i]=FREE;return true;}
if(kingCapture1(k,DR,next)) {board[i]=FREE;return true;}
}
if(kingCapture1(k,direction,next)) {board[i]=FREE;return true;}
if((!next) && k==to) {board[i]=FREE;return true;}// move ok
// move failed, restore
board[k]=FREE;
board[i]=save;
board[from]=KING1;
capture=true;
}
}
return false;
}
////////////////////////////////////////////////////
//
// Computer Functions
//
////////////////////////////////////////////////////
void ECheckers::kingMove2(int from, int& resMax)
{
board[from]=FREE;
int i=from-6;
if(board[i]==FREE) {
board[i]=KING2;
turn(resMax);
board[i]=FREE;
}
i=from-5;
if(board[i]==FREE) {
board[i]=KING2;
turn(resMax);
board[i]=FREE;
}
i=from+5;
if(board[i]==FREE) {
board[i]=KING2;
turn(resMax);
board[i]=FREE;
}
i=from+6;
if(board[i]==FREE) {
board[i]=KING2;
turn(resMax);
board[i]=FREE;
}
board[from]=KING2;
}
bool ECheckers::checkCapture2() const
{
for(int i=6;i<48;i++)
{
switch(board[i])
{
case MAN2:
if(board[i+5]==MAN1 || board[i+5]==KING1)
if(board[i+10]==FREE) return true;
if(board[i+6]==MAN1 || board[i+6]==KING1)
if(board[i+12]==FREE) return true;
break;
case KING2:
if(board[i-6]==MAN1 || board[i-6]==KING1)
if(board[i-12]==FREE) return true;
if(board[i-5]==MAN1 || board[i-5]==KING1)
if(board[i-10]==FREE) return true;
if(board[i+5]==MAN1 || board[i+5]==KING1)
if(board[i+10]==FREE) return true;
if(board[i+6]==MAN1 || board[i+6]==KING1)
if(board[i+12]==FREE) return true;
}
}
return false;
}
// Return TRUE if it is possible to capture
// Return FALSE if it is impossible to capture
bool ECheckers::manCapture2(int from, int& resMax)
{
bool capture=false;
// try left-down
int i=from+5;
if(board[i]==MAN1 || board[i]==KING1) {
int k=from+10;
if(board[k]==FREE) {
int save=board[i];
board[from]=FREE;
board[i]=NONE;
resMax--;
// become a king!
if(from>32) {
board[k]=KING2;
// aw?1
turn(resMax, true); //aw???
//aw??if(!kingCapture2(k, UL, resMax)) turn(resMax, true);
} else {
board[k]=MAN2;
if(!manCapture2(k, resMax)) turn(resMax, true);
}
// restore
resMax++;
board[k]=FREE;
board[i]=save;
board[from]=MAN2;
capture=true;
}
}
// now right-down
i=from+6;
if(board[i]==MAN1 || board[i]==KING1) {
int k=from+12;
if(board[k]==FREE) {
int save=board[i];
board[from]=FREE;
board[i]=NONE;
resMax--;
// become a king!
if(from>32) {
board[k]=KING2;
// aw?1
turn(resMax, true); // aw???
//aw???if(!kingCapture2(k,UR,resMax)) turn(resMax,true);
} else {
board[k]=MAN2;
if(!manCapture2(k,resMax)) turn(resMax,true);
}
// restore
resMax++;
board[k]=FREE;
board[i]=save;
board[from]=MAN2;
capture=true;
}
}
if(capture) return true;
return false;
}
bool ECheckers::kingCapture2(int from, int direction, int &resMax)
{
int i=from+direction;
if(board[i]==MAN1 || board[i]==KING1)
{
int k=i+direction;
if(board[k]==FREE)
{
bool capture=false;
int save=board[i];
board[from]=FREE;
board[i]=NONE;
resMax--;
board[k]=KING2;
if(direction==UL || direction==DR) {
if(kingCapture2(k,UR,resMax)) capture=true;
if(kingCapture2(k,DL,resMax)) capture=true;
} else {
if(kingCapture2(k,UL,resMax)) capture=true;
if(kingCapture2(k,DR,resMax)) capture=true;
}
if(kingCapture2(k,direction,resMax)) capture=true;
if(!capture) turn(resMax,true);
board[k]=FREE;
//restore
resMax++;
board[i]=save;
board[from]=KING2;
return true;
}
}
return false;
}
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