NetBSD/games/dab/board.cc

/*	$NetBSD: board.cc,v 1.5 2021/12/05 09:22:45 rillig Exp $	*/

/*-
 * Copyright (c) 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * 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.
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Board manipulations
 */

#include "defs.h"
RCSID("$NetBSD: board.cc,v 1.5 2021/12/05 09:22:45 rillig Exp $")

#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "board.h"
#include "gamescreen.h"
#include "box.h"
#include "player.h"

BOARD::BOARD(size_t y, size_t x, GAMESCREEN* scrn) :
    _ny(y),
    _nx(x),
    _scrn(scrn)
{
    _ty = 2 * _ny + 1;
    _tx = 2 * _nx + 1;

    _b = new int*[_ty];

    for (y = 0; y < _ty; y++)
	_b[y] = new int[_tx];

    init();
}

BOARD::BOARD(const BOARD& b) :
    _ty(b._ty),
    _tx(b._tx),
    _ny(b._ny),
    _nx(b._nx),
    _scrn(NULL)
{
    _b = new int*[_ty];

    for (size_t y = 0; y < _ty; y++) {
	_b[y] = new int[_tx];
	static_cast<void>(memcpy(_b[y], b._b[y], _tx * sizeof(int)));
    }
}

BOARD::~BOARD()
{
    size_t y;

    for (y = 0; y < _ty; y++)
	delete[] _b[y];

    delete[] _b;
}

// Clear all boxes and reset state for a new game
void BOARD::init(void)
{
    size_t x, y;

    for (y = 0; y < _ny; y++) 
	for (x = 0; x < _nx; x++) {
	    BOX box(y, x, *this);
	    box.reset();
	}
}

/*
 * Make a move for player with initial 'c', adding an edge at box(x, y)
 * and the specified direction.
 * returns:
 *	-1:	Invalid move
 *	 n:	Number of closures n E [0..2]
 */
int BOARD::domove(size_t y, size_t x, int dir, char c)
{
    int closed = 0;

    // Check if out of bounds
    if (!bounds(y, x))
	return -1;

    BOX box1(y, x, *this);

    // Check if the edge is already there
    if (box1.isset(dir))
	return -1;

    box1.set(dir);

    if (box1.count() == 4) {
	// New box; name it and count it
	box1.name() = c;
	closed++;
    }

    box1.paint();

    // Check other box
    x += BOX::edges[dir].x;
    y += BOX::edges[dir].y;

    if (bounds(y, x)) {
	BOX box2(y, x, *this);
	if (box2.count() == 4) {
	    box2.name() = c;
	    box2.paint();
	    closed++;
	}
    }
    return closed;
}

// Return true if the board is full
int BOARD::full(void) const
{
    for (size_t y = 0; y < _ny; y++)
	for (size_t x = 0; x < _nx; x++) {
	    BOX box(y, x, const_cast<BOARD&>(*this));
	    if (box.count() != 4)
		return 0;
	}
    return 1;
}

// Return if the coordinates are within bounds; we don't check for < 0,
// since size_t is unsigned
int BOARD::bounds(size_t y, size_t x) const
{
    return x < _nx && y < _ny;
}

// Paint all boxes, effectively redrawing the board
void BOARD::paint(void) const
{
    for (size_t y = 0; y < _ny; y++)
	for (size_t x = 0; x < _nx; x++) {
	    BOX box(y, x, const_cast<BOARD&>(*this));
	    box.paint();
	}
}

// Clear the screen
void BOARD::clean(void) const
{
    if (!_scrn)
	return;
    _scrn->clean();
}

// Move cursor to x, y
void BOARD::setpos(size_t y, size_t x) const
{
    if (!_scrn)
	return;
    _scrn->moveto(y, x);
    _scrn->redraw();
}

// Return character indicating move
int BOARD::getmove(void) const
{
    if (!_scrn)
	return 'q';
    _scrn->redraw();
    return _scrn->getinput();
}

// Ring the bell
void BOARD::bell(void) const
{
    if (!_scrn)
	return;
    _scrn->bell();
}

// Post the score in the current game for player i
void BOARD::score(size_t i, const PLAYER& p)
{
    if (_scrn == NULL)
	return;
    _scrn->score(i, p);
}

// Post the number of games won for player i
void BOARD::games(size_t i, const PLAYER& p)
{
    if (_scrn == NULL)
	return;
    _scrn->games(i, p);
}

// Post the total score for player i
void BOARD::total(size_t i, const PLAYER& p)
{
    if (_scrn == NULL)
	return;
    _scrn->total(i, p);
}

// Post the total score for player i
void BOARD::ties(const PLAYER& p)
{
    if (_scrn == NULL)
	return;
    _scrn->ties(p);
}

// Internal algorithm error; post and abort
void BOARD::abort(const char* s, ...) const
{
    for (size_t i = 0; i < _ny; i++)
	fprintf(stderr, "\n");

    va_list ap;
    fprintf(stderr, "Algorithm internal error: ");
    va_start(ap, s);
    vfprintf(stderr, s, ap);
    va_end(ap);
    fprintf(stderr, "\n");
    ::abort();
}