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pawn.cc
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#include "pawn.h"
#include <utility>
#include "board.h"
using namespace std;
Pawn::Pawn(bool side): ChessPiece(side) {
piece.first = PieceType::Pawn;
}
std::vector<Position> Pawn::getAvalibleMoves(Position pos, Board* b) {
std::vector<Position> result;
Position retpos;
int x = (int) pos.first;
int y = pos.second;
bool side = b->getType(pos).second;
//for white player, pawn can only go up
if(!side && y+1 <= 8){
retpos.first = pos.first;
retpos.second = y+1;
//can only foward 1 cell if that cell is empty
//also can only move forward by 2 cells if it hasn't moved yet
if(b->getType(retpos).first == PieceType::Empty){
result.emplace_back(retpos);
retpos.second = y + 2;
if(moves == 0 && pos.second != 7 && b->getType(retpos).first == PieceType::Empty){
result.emplace_back(retpos);
}
}
//can only capture diagonally
if(x+1 <= 8){
retpos.first = (locationx)(x+1);
retpos.second = y+1;
if(b->getType(retpos).first != PieceType::Empty &&
b->getType(retpos).second != b->getType(pos).second){
result.emplace_back(retpos);
}
retpos.second = y;
retpos.first = (locationx)(x+1);
if(y+2 < 8 && b->getType(retpos).first == PieceType::Pawn && b->moved(retpos) == 1 &&
b->getType(retpos).second != b->getType(pos).second){
ChessMove expmove = {{retpos.first, y+2}, {retpos.first, y}};
ChessMove lastmove = b->lastMove();
if(lastmove == expmove){
retpos.second = y+1;
result.emplace_back(retpos);
}
}
}
if(x-1 >= 1){
retpos.first = (locationx)(x-1);
retpos.second = y+1;
if(b->getType(retpos).first != PieceType::Empty &&
b->getType(retpos).second != b->getType(pos).second){
result.emplace_back(retpos);
}
retpos.second = y;
retpos.first = (locationx)(x-1);
if(y+2 < 8 && b->getType(retpos).first == PieceType::Pawn && b->moved(retpos) == 1 &&
b->getType(retpos).second != b->getType(pos).second){
ChessMove expmove = {{retpos.first, y+2}, {retpos.first, y}};
ChessMove lastmove = b->lastMove();
if(lastmove == expmove){
retpos.second = y+1;
result.emplace_back(retpos);
}
}
}
}
//for black player, pawn can only go down
if(side && y-1 >= 1){
retpos.first = pos.first;
retpos.second = y-1;
//can only move foward 1 cell if that cell is empty
if(b->getType(retpos).first == PieceType::Empty){
result.emplace_back(retpos);
retpos.second = y - 2;
if(moves == 0 && pos.second != 2 && b->getType(retpos).first == PieceType::Empty){
result.emplace_back(retpos);
}
}
//can only capture diagonally
if(x+1 <= 8){
retpos.first = (locationx)(x+1);
retpos.second = y-1;
if(b->getType(retpos).first != PieceType::Empty &&
b->getType(retpos).second != b->getType(pos).second){
result.emplace_back(retpos);
}
retpos.second = y;
retpos.first = (locationx)(x+1);
if(y-2 > 1 && b->getType(retpos).first == PieceType::Pawn && b->moved(retpos) == 1 &&
b->getType(retpos).second != b->getType(pos).second){
ChessMove expmove = {{retpos.first, y-2}, {retpos.first, y}};
ChessMove lastmove = b->lastMove();
if(lastmove == expmove){
retpos.second = y-1;
result.emplace_back(retpos);
}
}
}
if(x-1 >= 1){
retpos.first = (locationx)(x-1);
retpos.second = y-1;
if(b->getType(retpos).first != PieceType::Empty &&
b->getType(retpos).second != b->getType(pos).second){
result.emplace_back(retpos);
}
retpos.second = y;
retpos.first = (locationx)(x-1);
if(y-2 > 1 && b->getType(retpos).first == PieceType::Pawn && b->moved(retpos) == 1 &&
b->getType(retpos).second != b->getType(pos).second){
ChessMove expmove = {{retpos.first, y-2}, {retpos.first, y}};
ChessMove lastmove = b->lastMove();
if(lastmove == expmove){
retpos.second = y-1;
result.emplace_back(retpos);
}
}
}
}
return result;
}
Piece Pawn::getType(){
return piece;
}