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/*
* Atom-4 triboard
* Header file
*
* $Id: board4.h,v 1.4 2003/04/08 09:56:28 hsteoh Exp hsteoh $
*/
#ifndef BOARD4_H
#define BOARD4_H
#include <stdlib.h> // for NULL
#include <list.h> // MUST be prog/lib version!
#include "color4.h"
#include "triboard.h"
// Representation for a unit of change on the board
struct boardchange {
int x,y;
color4 cell;
boardchange(int xcoor, int ycoor, color4 c) : x(xcoor), y(ycoor), cell(c) {}
};
class board4 : public triboard {
public:
board4(unsigned int width, unsigned int height) : triboard(width,height) {}
board4(board4 &b) : triboard(b) {}
board4 &operator= (board4 &b);
~board4();
// Check if it's legal to place a tile here
int check_legal(int x, int y);
// Compute color changes caused by actor at (x,y). Note that the actor
// itself is included in the delta as the first board change.
void compute_splash(int x, int y, color4 actor, elist<boardchange> &delta);
// Apply changes specified by &delta. Also computes reverse delta that can
// be applied to reverse changes, unless *undo == NULL.
void applychanges(elist<boardchange> &delta, elist<boardchange> *undo);
// Counts the number of consecutive matching marbles in the given direction
// from (x,y).
int count_marbles(color4 marble, int x, int y, int dir, int max);
// Check if there's a row of N same colored marbles in any direction from
// (x,y).
int check_row(color4 marble, int x, int y, int length);
// Check the locations indicated in &lastchanges to see if there's a winning
// row in any of them.
int check_win(elist<boardchange> &lastchanges, color4 piece, int rowlen);
};
#endif // BOARD4_H
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