SNAKEEEEEEEEEEEE

grid_game_engine.c

@@ -90,7 +90,7 @@ static void display_hackerman(void) {
 }
 
 void graceful_exit(void) {
-    mvprintw(5, 5, "Press 'q' to exit.");
+    mvprintw(25, 5, "Press 'q' to exit.");
     while (1) {
         switch (getch()) {
             case 'q':

grid_game_engine.h

@@ -11,6 +11,11 @@
 #define MINIGAME_MENU_GRID_GAME_ENGINE_H
 #include "rooster.h"
 
+typedef struct {
+    int x;
+    int y;
+} coordinate;
+
 typedef enum {
     BLACK = 1,
     WHITE = 2,

maze_runner.c

@@ -23,7 +23,7 @@ static rooster *get_maze(void) {
         perror("loading maze");
         exit(EXIT_FAILURE);
     }
-    rooster *rp = rooster_lees(fh);
+    rooster *rp = grid_from_file(fh);
     fclose(fh);
 
     // 3. Bepaal of het lezen van het rooster is gelukt.
@@ -83,33 +83,30 @@ static void maze_runner_beweeg(rooster *rp, int dx, int dy) {
  * AAN_HET_SPELEN is.
  */
 static void speel_maze(rooster *rp) {
-    while (rooster_vraag_toestand(rp) == STATE_AAN_HET_SPELEN)
-    {
-        switch (getch()) {
-            case KEY_UP: // fallthrough
-            case 'w':
-            case 'W':
-                maze_runner_beweeg(rp, 0, -1);
-                break;
-            case KEY_DOWN: // fallthrough
-            case 's':
-            case 'S':
-                maze_runner_beweeg(rp, 0, 1);
-                break;
-            case KEY_LEFT: // fallthrough
-            case 'a':
-            case 'A':
-                maze_runner_beweeg(rp, -1, 0);
-                break;
-            case KEY_RIGHT: // fallthrough
-            case 'd':
-            case 'D':
-                maze_runner_beweeg(rp, 1, 0);
-                break;
-            case KEY_BACKSPACE:
-                rooster_zet_toestand(rp, STATE_QUIT);
-                break;
-        }
+    switch (getch()) {
+        case KEY_UP: // fallthrough
+        case 'w':
+        case 'W':
+            maze_runner_beweeg(rp, 0, -1);
+            break;
+        case KEY_DOWN: // fallthrough
+        case 's':
+        case 'S':
+            maze_runner_beweeg(rp, 0, 1);
+            break;
+        case KEY_LEFT: // fallthrough
+        case 'a':
+        case 'A':
+            maze_runner_beweeg(rp, -1, 0);
+            break;
+        case KEY_RIGHT: // fallthrough
+        case 'd':
+        case 'D':
+            maze_runner_beweeg(rp, 1, 0);
+            break;
+        case KEY_BACKSPACE:
+            rooster_zet_toestand(rp, STATE_QUIT);
+            break;
     }
 }
 

minigame_menu.c

@@ -155,7 +155,7 @@ static rooster *initialize_menu(void) {
                   "   Snake   \n"
                   "Minesweeper\n"
                   "   Leave   \n";
-    rooster *rp = rooster_maak(menu);
+    rooster *rp = grid_from_string(menu);
     return rp;
 }
 

rooster.c

@@ -1,5 +1,6 @@
 #include "rooster.h"
 
+#include <ncurses.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
@@ -14,11 +15,12 @@ typedef struct rooster_data {
     toestand state;
 } rooster;
 
-rooster *rooster_maak(const char* input) {
+rooster *grid_from_string(const char* input) {
     int width = 0;
     int height = 0;
     const size_t len = strlen(input) / sizeof(char);
     if (input == NULL || len == 0) {
+        printf("invalid input\n");
         return NULL;
     }
 
@@ -30,6 +32,7 @@ rooster *rooster_maak(const char* input) {
 
     for (int i = 0; i < height; i = i + width + 1) {
         if ((int)strcspn(&input[i], "\n") != width) {
+            printf("line %d was not %d wide\n", i, width);
             return NULL;
         }
     }
@@ -92,7 +95,7 @@ static int get_grid_sizes(FILE *fh, rooster *rost) {
     return 1;
 }
 
-rooster *rooster_lees(FILE *fh) {
+rooster *grid_from_file(FILE *fh) {
     if (fh == NULL) {
         return NULL;
     }

rooster.h

@@ -39,7 +39,7 @@ typedef enum {
             NULL teruggegeven. (In dat geval blijft geen gereserveerd geheugen
             achter.)
 */
-rooster *rooster_lees(FILE *fh);
+rooster *grid_from_file(FILE *fh);
 
 /*
  * Maak een rooster op basis van een gegeven string.
@@ -54,7 +54,7 @@ rooster *rooster_lees(FILE *fh);
  *         NULL teruggegeven. (In dat geval blijft geen gereserveerd geheugen
  *         achter.)
  */
-rooster *rooster_maak(const char* input);
+rooster *grid_from_string(const char* input);
 
 /*
  * Haal een rij uit het rooster op.

snake.c

@@ -6,9 +6,65 @@
 
 #include <ncurses.h>
 #include <stdlib.h>
+#include <string.h>
+#include <time.h>
 
 #include "grid_game_engine.h"
 
+#define CELL_EMPTY ' '
+#define CELL_FOOD '$'
+#define CELL_WALL '#'
+#define DIRECTION_COUNT 4
+#define OFFSET_X 6
+#define OFFSET_Y 3
+
+typedef enum {
+    SNAKE_MOVE = 0,
+    SNAKE_EAT = 1,
+    SNAKE_DIE = 2
+} snake_action;
+
+typedef enum {
+    DIRECTION_UP = 0,
+    DIRECTION_RIGHT = 1,
+    DIRECTION_DOWN = 2,
+    DIRECTION_LEFT = 3
+} direction;
+
+static direction PREVIOUS_DIRECTION = DIRECTION_DOWN;
+static direction CURRENT_DIRECTION = DIRECTION_DOWN;
+static coordinate SNAKE_HEAD;
+static coordinate SNAKE_TAIL;
+static coordinate MESSAGE_LOCATION = {0,0};
+static int MAP_HEIGHT = 20;
+static int MAP_WIDTH = 20;
+
+/*
+ * Create a snake body part.
+ *
+ * Input:
+ * dir: the direction the body part should point to.
+ *
+ * Output:
+ * a character representing that bodypart.
+ */
+static char get_body_part(const direction dir) {
+    return (char)dir + '0';
+}
+
+/*
+ * Gets the direction of a body part.
+ *
+ * Input:
+ * body_part: A part of the snake's body.
+ *
+ * Output:
+ * The direction the next body part is pointing to.
+ */
+static direction get_body_part_direction(const char body_part) {
+    return (direction)(body_part - '0');
+}
+
 /*
  * Create a grid for snake with a given height and width.
  *
@@ -19,53 +75,250 @@
  * Returns:
  * A pointer to the grid.
  */
-static rooster *initialize_snake(void) {
-    int width = 10;
-    int height = 10;
-    const int grid_size = (width + 1) * height + 1;
+static rooster *create_grid(void) {
+    const int grid_size = (MAP_WIDTH + 1) * MAP_HEIGHT + 1;
     char *map = malloc(grid_size * sizeof(char));
     if (map == NULL) {
         return NULL;
     }
 
-    for (int i = 0; i < (width + 1) * height; i++) {
-        int top_line = i < width;
-        int bottom_line = i > grid_size - (width + 2);
+    for (int i = 1; i <= (MAP_WIDTH + 1) * MAP_HEIGHT; i++) {
+        // Also subtract the null terminator
+        int bottom_line = i > grid_size - (MAP_WIDTH + 2);
+        int top_line = i < MAP_WIDTH + 1;
 
-        int line_position = modulo(i, width + 1);
+        int line_position = modulo(i, MAP_WIDTH + 1);
 
         int line_start = line_position == 1;
-        int line_end = line_position == width;
+        int line_end = line_position == MAP_WIDTH;
 
         int newline = line_position == 0;
 
         if (newline) {
-            map[i] = '\n';
+            map[i - 1] = '\n';
         } else if (top_line || bottom_line || line_start || line_end) {
-            map[i] = '#';
-        }
-        else {
-            map[i] = ' ';
+            map[i - 1] = CELL_WALL;
+        } else {
+            map[i - 1] = CELL_EMPTY;
         }
     }
 
     map[grid_size - 1] = '\0';
 
-    printf("%s", map);
-
-    rooster *grid = rooster_maak(map);
+    rooster *grid = grid_from_string(map);
     free(map);
 
+    rooster_plaats(grid, rooster_breedte(grid) / 2, rooster_hoogte(grid) / 2, get_body_part(CURRENT_DIRECTION));
+    return grid;
+}
+
+/*
+ *
+ */
+static void generate_food(rooster *gp) {
+    coordinate empty_spots[MAP_HEIGHT * MAP_WIDTH];
+
+    // Usable as index when initialized like this.
+    int available_spots = 0;
+
+    for (int x = 0; x < MAP_WIDTH; x++) {
+        for (int y = 0; y < MAP_HEIGHT; y++) {
+            if (rooster_kijk(gp, x, y) == CELL_EMPTY) {
+                coordinate new_spot = {x, y};
+                empty_spots[available_spots] = new_spot;
+                available_spots++;
+            }
+        }
+    }
+
+    // Available spots will now be a counter.
+
+    const coordinate food_location = empty_spots[modulo(rand(), available_spots)];
+
+    rooster_plaats(gp, food_location.x, food_location.y, CELL_FOOD);
+}
+
+/*
+ * Setup the game(map)
+ *
+ * Output:
+ * A pointer to the game grid.
+ *
+ * Side Effects:
+ * Seed random with the current time.
+ */
+static rooster *initialize(void) {
+    srand(time(NULL));
+
+    rooster *grid = create_grid();
+
+    if (grid == NULL) {
+        return NULL;
+    }
+
+    // Set snake head and snake tail.
+    rooster_zoek(grid, get_body_part(CURRENT_DIRECTION), &SNAKE_HEAD.x, &SNAKE_HEAD.y);
+    SNAKE_TAIL.x = SNAKE_HEAD.x;
+    SNAKE_TAIL.y = SNAKE_HEAD.y;
+
+    generate_food(grid);
+
+    if (SNAKE_HEAD.x == -1) {
+        return NULL;
+    }
+
+    MESSAGE_LOCATION.y = rooster_hoogte(grid) + OFFSET_Y + 5;
+    MESSAGE_LOCATION.x = OFFSET_X - 5 >= 0 ? OFFSET_X - 5 : 0;
+
     return grid;
 }
 
-void snake(void) {
-    // erase();
-    rooster* const gp = initialize_snake();
-    if (gp == NULL) {
-        printf("Help, initializing the grid failed\n");
+/*
+ * Checks what happens when the snake moves over a given char.
+ *
+ * Input:
+ * c: The char to check.
+ *
+ * Returns:
+ * The snake will move forward: 0
+ * The snake will eat an apple: 1
+ * The snake will die:          2
+ */
+static snake_action collision_check(char c) {
+    if (c == CELL_EMPTY) {
+        return SNAKE_MOVE;
     }
-    // show_grid(gp);
-    // graceful_exit();
-    // refresh();
+
+    if (c == CELL_FOOD) {
+        return SNAKE_EAT;
+    }
+
+    return SNAKE_DIE;
+}
+
+static void update_snake(rooster *gp, coordinate new_head, snake_action action) {
+    if (action == SNAKE_DIE) {
+        rooster_zet_toestand(gp, STATE_VERLOREN);
+        return;
+    }
+
+    if (action == SNAKE_MOVE) {
+        coordinate new_tail = SNAKE_TAIL;
+
+        switch (get_body_part_direction(rooster_kijk(gp, SNAKE_TAIL.x, SNAKE_TAIL.y))) {
+            case DIRECTION_UP:
+                new_tail.y--;
+                break;
+            case DIRECTION_RIGHT:
+                new_tail.x++;
+                break;
+            case DIRECTION_DOWN:
+                new_tail.y++;
+                break;
+            case DIRECTION_LEFT:
+                new_tail.x--;
+                break;
+        }
+
+        rooster_plaats(gp, SNAKE_TAIL.x, SNAKE_TAIL.y, CELL_EMPTY);
+        SNAKE_TAIL = new_tail;
+    }
+
+    // New head placed after tail moves. It can occupy the empty space created by the tail moving.
+    rooster_plaats(gp, new_head.x, new_head.y, get_body_part(CURRENT_DIRECTION));
+    SNAKE_HEAD = new_head;
+    PREVIOUS_DIRECTION = CURRENT_DIRECTION;
+
+    if (action == SNAKE_EAT) {
+        generate_food(gp);
+    }
+}
+
+static void snake_move(rooster *gp) {
+    coordinate new_head = SNAKE_HEAD;
+    switch (CURRENT_DIRECTION) {
+        case DIRECTION_UP:
+            new_head.y--;
+            break;
+        case DIRECTION_RIGHT:
+            new_head.x++;
+            break;
+        case DIRECTION_DOWN:
+            new_head.y++;
+            break;
+        case DIRECTION_LEFT:
+            new_head.x--;
+            break;
+    }
+
+    snake_action action = collision_check(rooster_kijk(gp, new_head.x, new_head.y));
+
+    update_snake(gp, new_head, action);
+    show_grid_on_offset(gp, OFFSET_X, OFFSET_Y);
+}
+
+static void turn_snake(rooster *gp, direction dir) {
+    if ((direction)modulo(dir + 2, DIRECTION_COUNT) == PREVIOUS_DIRECTION) {
+        return;
+    }
+    rooster_plaats(gp, SNAKE_HEAD.x, SNAKE_HEAD.y, get_body_part(dir));
+    CURRENT_DIRECTION = dir;
+    show_grid_on_offset(gp, OFFSET_X, OFFSET_Y);
+}
+
+static void play_snake(rooster *gp) {
+    timeout(500);
+
+    switch (getch()) {
+        case KEY_UP: // fallthrough
+        case 'w':
+        case 'W':
+            turn_snake(gp, DIRECTION_UP);
+            break;
+        case KEY_DOWN: // fallthrough
+        case 's':
+        case 'S':
+            turn_snake(gp, DIRECTION_DOWN);
+            break;
+        case KEY_LEFT: // fallthrough
+        case 'a':
+        case 'A':
+            turn_snake(gp, DIRECTION_LEFT);
+            break;
+        case KEY_RIGHT: // fallthrough
+        case 'd':
+        case 'D':
+            turn_snake(gp, DIRECTION_RIGHT);
+            break;
+        case KEY_BACKSPACE:
+            rooster_zet_toestand(gp, STATE_QUIT);
+            break;
+        case ERR:
+            snake_move(gp);
+    }
+}
+
+void snake(void) {
+    rooster* const gp = initialize();
+    if (gp == NULL) {
+        return;
+    }
+    erase();
+
+    //todo: ?? Win condition?
+
+    show_grid_on_offset(gp, OFFSET_X, OFFSET_Y);
+
+    mvprintw(MESSAGE_LOCATION.y, MESSAGE_LOCATION.x, "Press SPACEBAR to start playing.");
+    while (getch() != ' ') {}
+
+    rooster_zet_toestand(gp, STATE_AAN_HET_SPELEN);
+    while (rooster_vraag_toestand(gp) == STATE_AAN_HET_SPELEN) {
+        play_snake(gp);
+    }
+
+    // game_exit_screen(gp);
+
+    rooster_klaar(gp);
+    graceful_exit();
 }

spel.c

@@ -13,7 +13,6 @@
 
 #include "grid_game_engine.h"
 #include "minigame_menu.h"
-#include "snake.h"
 
 int main(void) {
     init_engine();