src/chess/queen.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2016 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
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 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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#include "rules.h"
#include "rook.h"
#include "bishop.h"
#include "queen.h"

bool queen_chkrules(const Move* move) {
    return bishop_chkrules(move) || rook_chkrules(move);
}

bool queen_isblocked(const GameState *gamestate, const Move *move) {
    if (rook_chkrules(move)) {
        return rook_isblocked(gamestate, move);
    } else {
        return bishop_isblocked(gamestate, move);
    }
}

size_t queen_moves(GameState *gamestate, Color c, Row r, File f, Move *moves) {
    size_t count = 0;
    const int directions[8][2] = {
        { 1,  0},
        {-1,  0},
        { 0,  1},
        { 0, -1},
        { 1,  1},
        { 1, -1},
        {-1,  1},
        {-1, -1}
    };

    for (size_t i = 0 ; i < 8 ; i++) {
        int row = r + directions[i][0];
        int file = f + directions[i][1];

        while (isidx(row) && isidx(file)) {
            moves[count] = (Move){0};
            moves[count].piece = mkpiece(QUEEN, c);
            moves[count].fromrow = r;
            moves[count].fromfile = f;
            moves[count].torow = row;
            moves[count].tofile = file;
            moves[count].capture = piece_at(gamestate, row, file) != 0;
            count++;

            row += directions[i][0];
            file += directions[i][1];
        }
    }

    return count;
}