From 673e4900e93767b8bb3241b89c13424ff6fbf547 Mon Sep 17 00:00:00 2001
From: Vasil Zlatanov <v@skozl.com>
Date: Mon, 8 May 2017 00:40:40 +0100
Subject: Implement 2048 game prototype

---
 src/2048.cpp | 178 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 src/2048.cpp

(limited to 'src/2048.cpp')

diff --git a/src/2048.cpp b/src/2048.cpp
new file mode 100644
index 0000000..13afd1f
--- /dev/null
+++ b/src/2048.cpp
@@ -0,0 +1,178 @@
+/*
+  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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