Get the basic game working

apple2048.c

@@ -1,12 +1,121 @@
+#include <conio.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <conio.h>
+
+#include "game.h"
+
+
+void printBoard(void)
+{
+    tPos x;
+    tPos y;
+
+    clrscr();
+
+    for (y = 1; y <= BOARD_SIZE; y++) {
+        printf("+");
+        for (x = 1; x <= BOARD_SIZE; x++) {
+            printf("--------+");
+        }
+        printf("\n!");
+        for (x = 1; x <= BOARD_SIZE; x++) {
+            printf("        !");
+        }
+        printf("\n!");
+        for (x = 1; x <= BOARD_SIZE; x++) {
+            printf("%s!", tileStringForPos(x, y));
+        }
+        printf("\n!");
+        for (x = 1; x <= BOARD_SIZE; x++) {
+            printf("        !");
+        }
+        printf("\n");
+    }
+    printf("+");
+    for (x = 1; x <= BOARD_SIZE; x++) {
+        printf("--------+");
+    }
+    printf("\n\nCURRENT SCORE: %ld\nTRY TO GET THE %ld TILE!", currentScore(),
+            nextTarget());
+}
+
+
+void gameWon(void)
+{
+    printf("\nCONGRATULATIONS, YOU HAVE WON THE GAME!\n");
+    cgetc();
+    exit(0);
+}
+
+
+void gameLost(void)
+{
+    printf("\nSORRY, NO MORE MOVES.\n");
+    cgetc();
+    exit(0);
+}
+
+
+void handleNextEvent(void)
+{
+    char ch;
+
+    while (true) {
+        ch = cgetc();
+        switch (ch) {
+            case 'i':
+            case 'I':
+            case 11:        // Up arrow
+                slideInDirection(DIR_UP);
+                return;
+
+            case 'j':
+            case 'J':
+            case 8:         // Left arrow
+                slideInDirection(DIR_LEFT);
+                return;
+
+            case 'k':
+            case 'K':
+            case 21:        // Right arrow
+                slideInDirection(DIR_RIGHT);
+                return;
+
+            case 'm':
+            case 'M':
+            case 10:        // Up arrow
+                slideInDirection(DIR_DOWN);
+                return;
+
+            case 27:        // Escape
+            case 'q':
+            case 'Q':
+                exit(0);
+
+            case 'r':
+            case 'R':
+                initGame();
+                return;
+        }
+    }
+}
 
 
 int main(void)
 {
-    printf("DOES THIS WORK...\n");
-    while (!kbhit()) {
+    initGame();
+
+    while (true) {
+        printBoard();
+
+        if (isGameWon())
+            gameWon();
+
+        if (isGameLost())
+            gameLost();
+
+        handleNextEvent();
     }
+
     return 0;
 }

game.c

@@ -76,6 +76,9 @@ static tTileValue gNextTarget = 11;
 static uint8_t gNumEmptyTiles;
 
 
+void addRandomTile(void);
+
+
 void initGame(void)
 {
     tPos pos;
@@ -133,8 +136,10 @@ void slideInDirection(tDir dir)
     tPos pos;
     tPos destPos;
     int8_t incr;
+    tTileValue tileValue;
+    bool addNewTile = false;
 
-    if (dir > 0) {
+    if (dir < 0) {
         pos = 0;
         incr = 1;
     } else {
@@ -149,14 +154,34 @@ void slideInDirection(tDir dir)
         if (destPos == pos)
             continue;
     
-        if (gTileValues[destPos] > 0) {
+        addNewTile = true;
+
+        tileValue = gTileValues[destPos];
+        if (tileValue > 0) {
+            tileValue++;
             gTileValues[destPos]++;
             gNumEmptyTiles++;
+            gCurrentScore += gValueScores[tileValue];
+
+            // This is a hack to prevent multiple merges from happening to
+            // the same tile in a single turn.  We set the value to a high
+            // negative (< -1) and then flip the sign bit later.
+            gTileValues[destPos] = -tileValue;
         } else {
             gTileValues[destPos] = gTileValues[pos];
         }
         gTileValues[pos] = 0; // Empty the old position
     }
+
+    for (pos = 0; pos < NUM_TILES; pos++) {
+        tileValue = gTileValues[pos];
+        if (tileValue < BLOCKED_TILE_VALUE) {
+            gTileValues[pos] = -tileValue;
+        }
+    }
+
+    if (addNewTile)
+        addRandomTile();
 }
 
 

game.h

@@ -28,8 +28,6 @@ void initGame(void);
 
 void slideInDirection(tDir dir);
 
-void addRandomTile(void);
-
 tScore currentScore(void);
 
 tScore nextTarget(void);