drake/serpent
1
0
Fork 0
Code Issues Pull requests Activity

Updated: commented the whole code

Browse source
This commit is contained in:
Lian Drake 2023-12-07 19:33:25 -04:00
parent 6c88b3c89b
commit 2554dcac3e
3 changed files with 132 additions and 39 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

BIN
serpent
View file

Binary file not shown.

134
serpent.c
View file

@ -30,8 +30,11 @@
#include "serpent.h" #include "serpent.h"
/* */ /* */
// Variable to track if snake is alive /* Game variables */
bool is_alive = true; bool is_alive = true; /* variable to track if snake is alive */
int SPEED = 100; /* speed of the game */
int MAX_SPEED = 60; /* max speed of the game */
/* */
/* Initialize structs */ /* Initialize structs */
snake_t *snake; snake_t *snake;
@ -56,6 +59,7 @@ void argVersion();
/* */ /* */
int main (int argc, char **argv) { int main (int argc, char **argv) {
/* Command line parsing */
int option; int option;
static const char* short_options = "chv"; static const char* short_options = "chv";
@ -82,8 +86,9 @@ int main (int argc, char **argv) {
return 1; return 1;
} }
} }
/* */
// Initialize board /* Initialize board */
board_t board = { board_t board = {
.border = BOARD_CHAR, .border = BOARD_CHAR,
.boardHeight = SCREEN_HEIGHT, .boardHeight = SCREEN_HEIGHT,
@ -129,6 +134,7 @@ int main (int argc, char **argv) {
usleep(SPEED * 800L); usleep(SPEED * 800L);
} }
/* Game score */
int score = snakeSize(); int score = snakeSize();
/* Free memory allocated by snake */ /* Free memory allocated by snake */
@ -145,243 +151,327 @@ int main (int argc, char **argv) {
return 0; return 0;
} }
void appendSnakeNode(snake_t * new_snake) { void appendSnakeNode(snake_t *new_snake) {
/* Allocate memory for a new snake node */
snake_node *node_ptr = malloc(sizeof(snake_node)); snake_node *node_ptr = malloc(sizeof(snake_node));
/* Set the previous pointer of the new node to the current tail of the snake */
node_ptr->prev = new_snake->tail; node_ptr->prev = new_snake->tail;
/* The new node is the last in the linked list, so its next pointer is NULL */
node_ptr->next = NULL; node_ptr->next = NULL;
/* Connect the current tail's next pointer to the new node */
new_snake->tail->next = node_ptr; new_snake->tail->next = node_ptr;
/* Update the snake's tail to point to the new node, making it the new tail */
new_snake->tail = node_ptr; new_snake->tail = node_ptr;
} }
snake_t *startSnake(board_t *board) { snake_t *startSnake(board_t *board) {
/* Allocate memory for a new snake */
snake_t *new_snake = malloc(sizeof(snake_t)); snake_t *new_snake = malloc(sizeof(snake_t));
/* Allocate memory for the head of the snake */
snake_node *head = malloc(sizeof(snake_node)); snake_node *head = malloc(sizeof(snake_node));
/* Initialize the snake's head and tail to the allocated head node */
new_snake->head = head; new_snake->head = head;
new_snake->tail = head; new_snake->tail = head;
/* Set the head's previous and next pointers to NULL, as it's the only node in the beginning */
head->prev = NULL; head->prev = NULL;
head->next = NULL; head->next = NULL;
/* Set the initial position of the snake's head at the center of the board */
head->pX = board->boardWidth / 2; head->pX = board->boardWidth / 2;
head->pY = board->boardHeight / 2; head->pY = board->boardHeight / 2;
/* Initialize a node pointer to the head for iterating through the snake's body */
snake_node *node = head; snake_node *node = head;
/* Create additional nodes to form the initial snake body */
for (int i = 1; i < START_SNAKE_SIZE; i++) { for (int i = 1; i < START_SNAKE_SIZE; i++) {
/* Add a new node to the snake, updating the node pointer */
appendSnakeNode(new_snake); appendSnakeNode(new_snake);
node = node->next; node = node->next;
/* Copy the position of the previous node to maintain a straight line */
node->pX = node->prev->pX; node->pX = node->prev->pX;
node->pY = node->prev->pY + 1; node->pY = node->prev->pY + 1;
} }
/* Set the initial direction of the snake to move upward */
new_snake->dX = 0; new_snake->dX = 0;
new_snake->dY = -1; new_snake->dY = -1;
/* Return the initialized snake */
return new_snake; return new_snake;
} }
void freeSnake() { void freeSnake() {
/* Initialize pointers to traverse the snake linked list */
snake_node *snake_current = snake->head; snake_node *snake_current = snake->head;
snake_node *snake_next = snake->head->next; snake_node *snake_next = snake->head->next;
/* Traverse the snake linked list and free each node */
while (snake_next != NULL) { while (snake_next != NULL) {
/* Free the current node */
free(snake_current); free(snake_current);
/* Move to the next node */
snake_current = snake_next; snake_current = snake_next;
snake_next = snake_next->next; snake_next = snake_next->next;
} }
/* Free the last node */
free(snake_current); free(snake_current);
/* Free the snake structure itself */
free(snake); free(snake);
/* Set the global snake pointer to NULL to avoid dangling references */
snake = NULL; snake = NULL;
} }
bool snakeOccupies(int x, int y, bool excludeHead) { bool snakeOccupies(int x, int y, bool excludeHead) {
/* Initialize a pointer to traverse the snake linked list */
snake_node *snake_ptr; snake_node *snake_ptr;
/* Determine the starting point in the linked list based on whether the head should be excluded */
if (excludeHead) { if (excludeHead) {
snake_ptr = snake->head; snake_ptr = snake->head;
} else { } else {
snake_ptr = snake->head->next; snake_ptr = snake->head->next;
} }
/* Traverse the snake linked list */
while (snake_ptr != NULL) { while (snake_ptr != NULL) {
/* Check if the current node's position matches the specified coordinates */
if (snake_ptr->pX == x && snake_ptr->pY == y) { if (snake_ptr->pX == x && snake_ptr->pY == y) {
/* The snake occupies the specified position */
return true; return true;
} }
/* Move to the next node */
snake_ptr = snake_ptr->next; snake_ptr = snake_ptr->next;
} }
/* The snake does not occupy the specified position */
return false; return false;
} }
int snakeSize() { int snakeSize() {
/* Initialize a pointer to traverse the snake linked list */
snake_node *snake_ptr = snake->head; snake_node *snake_ptr = snake->head;
/* Initialize a counter to keep track of the number of nodes in the snake linked list */
int counter = 0; int counter = 0;
/* Traverse the snake linked list and count each node */
while (snake_ptr != NULL) { while (snake_ptr != NULL) {
counter++; counter++;
/* Move to the next node */
snake_ptr = snake_ptr->next; snake_ptr = snake_ptr->next;
} }
/* Return the total size of the snake, which is the number of nodes in the linked list */
return counter; return counter;
} }
apple_t *startApple(board_t *board) { apple_t *startApple(board_t *board) {
/* Allocate memory for a new apple */
apple_t *new_apple = malloc(sizeof(apple_t)); apple_t *new_apple = malloc(sizeof(apple_t));
/* Seed the random number generator with the current time */
srand(time(NULL)); srand(time(NULL));
/* Generate random coordinates for the new apple, ensuring it does not overlap with the snake */
do { do {
new_apple->pX = (random() % (board->boardWidth - 2)) + 1; new_apple->pX = (random() % (board->boardWidth - 2)) + 1;
new_apple->pY = (random() % (board->boardHeight - 2)) + 1; new_apple->pY = (random() % (board->boardHeight - 2)) + 1;
} while (snakeOccupies(new_apple->pX, new_apple->pY, false)); } while (snakeOccupies(new_apple->pX, new_apple->pY, false));
/* Return the initialized apple */
return new_apple; return new_apple;
} }
void moveApple(board_t *board) { void moveApple(board_t *board) {
/* Variables to store the new coordinates for the apple */
int new_x, new_y; int new_x, new_y;
/* Generate new random coordinates for the apple, ensuring it does not overlap with the snake */
do { do {
new_x = (random() % (board->boardWidth - 2)) + 1; new_x = (random() % (board->boardWidth - 2)) + 1;
new_y = (random() % (board->boardHeight - 2)) + 1; new_y = (random() % (board->boardHeight - 2)) + 1;
} while (snakeOccupies(new_x, new_y, true)); } while (snakeOccupies(new_x, new_y, true));
/* Update the position of the existing apple to the new coordinates */
apple->pX = new_x; apple->pX = new_x;
apple->pY = new_y; apple->pY = new_y;
} }
bool appleOccupies(int x, int y) { bool appleOccupies(int x, int y) {
/* Check if the specified coordinates match the position of the apple */
if (apple->pX == x && apple->pY == y) { if (apple->pX == x && apple->pY == y) {
/* The apple occupies the specified position */
return true; return true;
} }
/* The apple does not occupy the specified position */
return false; return false;
} }
void handleInput(int key) { void handleInput(int key) {
switch(key) { /* Handle different key inputs to change the snake's direction */
switch (key) {
case KEY_UP: case KEY_UP:
/* If the snake is not currently moving down, change its direction to up */
if (snake->dY == 0) { if (snake->dY == 0) {
snake->dY = -1; snake->dY = -1;
snake->dX = 0; snake->dX = 0;
} }
break; break;
case KEY_DOWN: case KEY_DOWN:
/* If the snake is not currently moving up, change its direction to down */
if (snake->dY == 0) { if (snake->dY == 0) {
snake->dY = 1; snake->dY = 1;
snake->dX = 0; snake->dX = 0;
} }
break; break;
case KEY_RIGHT: case KEY_RIGHT:
/* If the snake is not currently moving left, change its direction to right */
if (snake->dX == 0) { if (snake->dX == 0) {
snake->dX = 1; snake->dX = 1;
snake->dY = 0; snake->dY = 0;
} }
break; break;
case KEY_LEFT: case KEY_LEFT:
/* If the snake is not currently moving right, change its direction to left */
if (snake->dX == 0) { if (snake->dX == 0) {
snake->dX = -1; snake->dX = -1;
snake->dY = 0; snake->dY = 0;
} }
break; break;
default: default:
/* Do nothing for other keys */
refresh(); refresh();
break; break;
} }
} }
void moveSnake(board_t *board) { void moveSnake(board_t *board) {
/* Check if the snake is moving (either horizontally or vertically) */
if ((ABS(snake->dX) > 0) || (ABS(snake->dY) > 0)) { if ((ABS(snake->dX) > 0) || (ABS(snake->dY) > 0)) {
/* Calculate the new coordinates for the head and tail of the snake */
int new_head_x = snake->head->pX + snake->dX; int new_head_x = snake->head->pX + snake->dX;
int new_head_y = snake->head->pY + snake->dY; int new_head_y = snake->head->pY + snake->dY;
int new_tail_x = snake->tail->pX + snake->dX; int new_tail_x = snake->tail->pX + snake->dX;
int new_tail_y = snake->tail->pY + snake->dY; int new_tail_y = snake->tail->pY + snake->dY;
/* Check if the new head position does not overlap with an apple */
if (!appleOccupies(new_head_x, new_head_y)) { if (!appleOccupies(new_head_x, new_head_y)) {
// Move the tail to the new position /* Move the tail to the new head position */
snake->tail->pX = new_head_x; snake->tail->pX = new_head_x;
snake->tail->pY = new_head_y; snake->tail->pY = new_head_y;
// Update the links in the snake /* Adjust the linked list to maintain the snake's continuity */
snake->tail->next = snake->head; snake->tail->next = snake->head;
snake->head->prev = snake->tail; snake->head->prev = snake->tail;
snake->tail = snake->tail->prev; snake->tail = snake->tail->prev;
snake->tail->next = NULL; snake->tail->next = NULL;
snake->head->prev->prev = NULL; snake->head->prev->prev = NULL;
snake->head = snake->head->prev; snake->head = snake->head->prev;
} else { } else {
// The snake eats the apple /* If the head overlaps with an apple (the snake ate an apple), move the apple to a new position */
moveApple(board); moveApple(board);
// Create a new head node /* Increase the speed if it hasn't reached the maximum */
if (SPEED <= MAX_SPEED) {
SPEED -= 1;
}
/* Create a new head node and update its position */
snake_node *new_head = malloc(sizeof(snake_node)); snake_node *new_head = malloc(sizeof(snake_node));
new_head->pX = new_head_x; new_head->pX = new_head_x;
new_head->pY = new_head_y; new_head->pY = new_head_y;
new_head->prev = NULL; new_head->prev = NULL;
new_head->next = snake->head; new_head->next = snake->head;
// Update the links in the snake /* Update the linked list to include the new head */
snake->head->prev = new_head; snake->head->prev = new_head;
snake->head = new_head; snake->head = new_head;
// Append a new node to the snake's tail /* Add a new node to the snake's body */
appendSnakeNode(snake); appendSnakeNode(snake);
/* Set the position for the tail node */
snake->tail->pX = new_tail_x; snake->tail->pX = new_tail_x;
snake->tail->pY = new_tail_y; snake->tail->pY = new_tail_y;
} }
// Check for collisions and update the snake /* Check for collision with the game borders or itself */
if (snakeOccupies(new_head_x, new_head_y, false) || if (snakeOccupies(new_head_x, new_head_y, false) ||
(new_head_x == 0) || (new_head_x == board->boardWidth - 1) || (new_head_x == 0) || (new_head_x == board->boardWidth - 1) ||
(new_head_y == 0) || (new_head_y == board->boardHeight - 1)) { (new_head_y == 0) || (new_head_y == board->boardHeight - 1)) {
/* If there is a collision, set the snake as not alive */
is_alive = false; is_alive = false;
} }
} }
} }
void draw(board_t *board) { void draw(board_t *board) {
/* Clear the terminal screen */
erase(); erase();
int i, j;
for (i = 0; i < board->boardHeight; i++) { /* Draw the borders of the game board */
for (j = 0; j < board->boardWidth; j++) { for (int i = 0; i < board->boardHeight; i++) {
for (int j = 0; j < board->boardWidth; j++) {
if (i == 0 || i == board->boardHeight - 1) { if (i == 0 || i == board->boardHeight - 1) {
/* Draw the top and bottom borders */
mvprintw(i, j, "%c", board->border); mvprintw(i, j, "%c", board->border);
} else if (j == 0 || j == board->boardWidth - 1) { } else if (j == 0 || j == board->boardWidth - 1) {
/* Draw the left and right borders */
mvprintw(i, j, "%c", board->border); mvprintw(i, j, "%c", board->border);
} }
} }
} }
/* Draw the snake on the game board */
snake_node *snake_ptr = snake->head; snake_node *snake_ptr = snake->head;
if (snake->dX == -1) { if (snake->dX == -1) {
/* Draw the snake head facing left */
mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_HEAD_L); mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_HEAD_L);
} else if (snake->dX == 1) { } else if (snake->dX == 1) {
/* Draw the snake head facing right */
mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_HEAD_R); mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_HEAD_R);
} else if (snake->dY == -1) { } else if (snake->dY == -1) {
/* Draw the snake head facing up */
mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_HEAD_U); mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_HEAD_U);
} else if (snake->dY == 1) { } else if (snake->dY == 1) {
/* Draw the snake head facing down */
mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_HEAD_D); mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_HEAD_D);
} }
/* Move to the next node */
snake_ptr = snake_ptr->next; snake_ptr = snake_ptr->next;
/* Draw the snake body */
while(snake_ptr != NULL) { while(snake_ptr != NULL) {
mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_BODY); mvaddch(snake_ptr->pY, snake_ptr->pX, SNAKE_BODY);
/* Move to the next node */
snake_ptr = snake_ptr->next; snake_ptr = snake_ptr->next;
} }
/* Draw the apple on the game board */
mvaddch(apple->pY, apple->pX, FOOD); mvaddch(apple->pY, apple->pX, FOOD);
/* Display the game score */
mvprintw(board->boardHeight + 3, 0, "Score: %d", snakeSize() - START_SNAKE_SIZE); mvprintw(board->boardHeight + 3, 0, "Score: %d", snakeSize() - START_SNAKE_SIZE);
} }
// Function for displaying the game controls in the command line /* Function for displaying the game controls in the command line */
void argControls() { void argControls() {
printf("%s controls.\n", NAME); printf("%s controls.\n", NAME);
printf("Movement:\n"); printf("Movement:\n");
@ -395,7 +485,7 @@ void argControls() {
printf("\tr: restart\n"); printf("\tr: restart\n");
} }
// Function to display the help message in the command line /* Function to display the help message in the command line */
void argHelp() { void argHelp() {
printf("Usage: %s [OPTIONS]\n", NAME); printf("Usage: %s [OPTIONS]\n", NAME);
printf("Play the all time classic snake game in the console.\n\n"); printf("Play the all time classic snake game in the console.\n\n");
@ -405,7 +495,7 @@ void argHelp() {
printf("\t-v, --version Display version and exit.\n"); printf("\t-v, --version Display version and exit.\n");
} }
// Function to display the version in the command line /* Function to display the version in the command line */
void argVersion() { void argVersion() {
printf("%s. version: %.1lf\n", NAME, VERSION); printf("%s. version: %.1lf\n", NAME, VERSION);
printf("Author: Darius Drake\n"); printf("Author: Darius Drake\n");

25
serpent.h
View file

@ -10,8 +10,8 @@
#define ABS(x) (x) < 0 ? -(x) : (x) #define ABS(x) (x) < 0 ? -(x) : (x)
/* */ /* */
/* global variables/constants */ /* Global variables/constants */
#define START_SNAKE_SIZE 2 /* snake's initial size */ #define START_SNAKE_SIZE 5 /* snake's initial size */
#define SNAKE_BODY '*' /* snake's body */ #define SNAKE_BODY '*' /* snake's body */
#define SNAKE_HEAD_U 'v' /* head when going up */ #define SNAKE_HEAD_U 'v' /* head when going up */
#define SNAKE_HEAD_D '^' /* head when going down */ #define SNAKE_HEAD_D '^' /* head when going down */
@ -21,27 +21,30 @@
#define BOARD_CHAR '#' /* character at corners of border */ #define BOARD_CHAR '#' /* character at corners of border */
#define SCREEN_WIDTH 40 /* the virtual screen width */ #define SCREEN_WIDTH 40 /* the virtual screen width */
#define SCREEN_HEIGHT 30 /* the virtual screen height */ #define SCREEN_HEIGHT 30 /* the virtual screen height */
#define SPEED 100 /* speed of the game */
/* */ /* */
/* Board structure */
typedef struct board_t { typedef struct board_t {
char border; char border; /* will use BOARD_CHAR */
unsigned int boardHeight; unsigned int boardHeight; /* will use SCREEN_HEIGHT */
unsigned int boardWidth; unsigned int boardWidth; /* will use SCREEN_WIDTH */
} board_t; } board_t;
/* Snake node structure (for dobly linked list) */
typedef struct snake_node { typedef struct snake_node {
int pX, pY; int pX, pY; /* represents the node's position on the board */
struct snake_node *next, *prev; struct snake_node *next, *prev; /* pointers to the next and previous nodes */
} snake_node; } snake_node;
/* Snake structure (dobly linked list) */
typedef struct snake_t { typedef struct snake_t {
int dX, dY; int dX, dY; /* represents the snake's direction */
snake_node *head, *tail; snake_node *head, *tail; /* snake's nodes, dobly linked list */
} snake_t; } snake_t;
/* Apple structure */
typedef struct apple_t { typedef struct apple_t {
int pX, pY; int pX, pY; /* represents the apple's position on the board */
} apple_t; } apple_t;
#endif //SERPENT_H #endif //SERPENT_H