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/*
Date: 2 Feb 2016
Author: Vasil Zlatanov
*/
#include "2048.h"
#include <stdio.h>
#include <stdlib.h> //needed for random
#include <time.h> // needed to for "random" seed
void init(int board[SIZE][SIZE])
{
int x, y;
// Load start config
for (x = 0; x < SIZE; x++) {
for (y = 0; y < SIZE; y++) {
board[x][y] = 0;
}
}
board[SIZE - 1][SIZE - 1] = 1;
}
int move(int direction, int board[SIZE][SIZE]){
int done;
switch(direction) {
case 3 :
done = slideLeft(board);
break;
case 2 :
done = slideDown(board);
break;
case 1 :
done = slideUp(board);
break;
case 0 :
done = slideRight(board);
break;
default :
done = 0;
}
return done;
}
int slideLeft(int board[SIZE][SIZE])
{
int done;
rotate(board);
done = slideUp(board);
rotate(board);
rotate(board);
rotate(board);
return done;
}
int slideRight(int board[SIZE][SIZE])
{
int done;
rotate(board);
rotate(board);
rotate(board);
done = slideUp(board);
rotate(board);
return done;
}
int slideUp(int board[SIZE][SIZE])
{
int done = 0;
int x;
for (x = 0; x < SIZE; x++) {
done |= push(board[x]);
}
return done;
}
int slideDown(int board[SIZE][SIZE])
{
int done;
rotate(board);
rotate(board);
done = slideUp(board);
rotate(board);
rotate(board);
return done;
}
int push(int array[SIZE])
{
int x, n, stop = 0, done = 0;
for (x = 1; x < SIZE; x++) {
if (array[x] != 0) { // make sure there is something in box
done = 2; // don't exit loop until we determine if there is a move
for (n = x - 1; done == 2; n--) {
if (array[n] != 0) { // if box has number in it
if (array[n] == array[x]) { // same so merge
array[n]++; // increase by power of two
stop = n + 1; // avoid double merge such as 2 2 0 4
array[x] = 0;
done = 1;
} else { // not the same so move just below
if (n + 1 != x) {
array[n + 1] = array[x];
array[x] = 0;
done = 1;
} else {
done = 0; // we can't slide any further
}
}
} else {
if (n == stop) {
array[stop] = array[x];
array[x] = 0;
done = 1;
}
}
}
}
}
return done;
}
void rotate(int board[SIZE][SIZE])
{
int x, y, n = SIZE, temp;
for (x = 0; x < n / 2; x++) {
for (y = x; y < n - x - 1; y++) {
temp = board[x][y];
board[x][y] = board[y][n - x - 1];
board[y][n - x - 1] = board[n - x - 1][n - y - 1];
board[n - x - 1][n - y - 1] = board[n - y - 1][x];
board[n - y - 1][x] = temp;
}
}
}
int gameover(int board[SIZE][SIZE])
{
int x, y;
int nofree = 1;
for (x = 0; x < SIZE - 1; x++) {
for (y = 0; y < SIZE - 1; y++) {
if (board[x][y] == 0) {
nofree = 0; // means we have a free square
}
}
}
if (nofree) {
// Check if there is any moves horizontaly or vertically;
for (x = 0; x < SIZE - 1; x++) {
for (y = 0; y < SIZE - 1; y++) {
if ((board[x][y] == board[x][y + 1]) ||
(board[x][y] == board[x + 1][y])) {
return 0;
}
}
}
}
return nofree;
}
void add2(int board[SIZE][SIZE])
{
int x, y, r, pos = 0, free[SIZE * SIZE][2];
for (x = 0; x < SIZE; x++) {
for (y = 0; y < SIZE; y++) {
if (board[x][y] == 0) {
free[pos][0] = x;
free[pos][1] = y;
pos++;
}
}
}
if (free > 0) {
r = rand() % pos;
board[free[r][0]][free[r][1]] = 1;
}
}
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