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dev: added Pawn movement checks, working through legal move logic

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This commit is contained in:
A.M. Rowsell 2025-08-06 09:27:13 -04:00
commit 016654da2f
Signed by untrusted user who does not match committer: amr
GPG key ID: E0879EDBDB0CA7B1
2 changed files with 102 additions and 2 deletions
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80
Piece.cpp
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@ -58,7 +58,7 @@ std::vector<Move> Rook::getLegalMoves(const Square &from, const Board &board) co
if (!target) {
moveList.push_back({from,
targetSquare});
} else if (target->getColour() != this->colour) {
} else if (target->getColour() != this->getColour()) {
moveList.push_back({from,
targetSquare});
break;
@ -94,6 +94,84 @@ std::vector<Move> Bishop::getLegalMoves(const Square &from, const Board &board)
std::vector<Move> Pawn::getLegalMoves(const Square &from, const Board &board) const {
std::vector<Move> moveList;
const int directions[2][4][2] = {
{ // black
{-1, 0}, // Up
{-2, 0}, // 2up first move
{-1, 1}, // attack to right
{-1, -1} // attack to left
},
{ // white
{1, 0}, // down
{2, 0}, // 2down first move
{1, 1}, // attack to right
{1, -1} // attack to left
}
};
if (this->getColour() == PIECE_BLACK) {
// go through black options
for (auto &dir : directions[0]) {
int r = from.rank + dir[0];
int f = from.file + dir[1];
if (r >= 0 && r < 8 && f >= 0 && f < 8) { // no need for a while loop as we only have finite moves in limited directions
const auto& target = board.boardGrid[r][f];
auto ra = static_cast<Rank> (r);
auto fi = static_cast<File> (f);
Square targetSquare = {ra, fi};
if (dir[0] == -2 && !this->checkIfMoved()) {
// then 2 is potentially legal
if (!target && !(board.boardGrid[r + 1][f])) // check both squares for pieces of any colour
moveList.push_back({from, targetSquare});
else
break;
} else if (abs(dir[1]) == 1) { // attempted capture (diagonal)
if (target && target->getColour() != this->getColour()) {
// legal capture
moveList.push_back({from, targetSquare});
} else {
break;
}
} else { // normal one square forward
if (!target)
moveList.push_back({from, targetSquare});
}
// now check if we are on 8th rank, for promotion
}
}
} else if (this->getColour() == PIECE_WHITE) {
for (auto &dir : directions[1]) {
// go through white options
int r = from.rank + dir[0];
int f = from.file + dir[1];
if (r >= 0 && r < 8 && f >= 0 && f < 8) { // no need for a while loop as we only have finite moves in limited directions
const auto& target = board.boardGrid[r][f];
auto ra = static_cast<Rank> (r);
auto fi = static_cast<File> (f);
Square targetSquare = {ra, fi};
if (dir[0] == 2 && !this->checkIfMoved()) {
// then 2 is potentially legal
if (!target && !(boardGrid[r - 1][f]))
moveList.push_back({from, targetSquare});
else
break;
} else if (abs(dir[1]) == 1) { // attempted capture (diagonal)
if (target && target->getColour() != this->getColour()) { // can only move there if it's a capture
// legal capture
moveList.push_back({from, targetSquare});
} else {
break;
}
} else { // normal one square forward
if (!target)
moveList.push_back({from, targetSquare});
}
// now check if we are on 8th rank, for promotion
}
}
}
return moveList;
}