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// SPDX-License-Identifier: MIT
// Written by: Sonny X. <sonny@shady.money>
#include <stdlib.h>
#include <raylib.h>
/* Constants */
#define GRID_SZ_DEFAULT 24
#define SCREEN_SZ_DEFAULT (GRID_SZ_DEFAULT * GRID_SZ_DEFAULT)
#define COLOR_BG (Color){199.f, 217.f, 240.f, 255.f}
#define COLOR_FG (Color){61.f, 70.f, 82.f, 255.f}
#define SNAKE_MAX 1
#define FOOD_MAX 1
#define SNAKE_SZ_DEFAULT 4
#define SNAKE_GAME_SPEED 12
typedef struct {
int x;
int y;
} food_t;
food_t *new_food(void);
void food_move(food_t *, int, int);
void food_update(food_t *);
void food_draw(food_t *);
food_t *food[FOOD_MAX];
typedef struct {
int x[SCREEN_SZ_DEFAULT];
int y[SCREEN_SZ_DEFAULT];
int dir_x, dir_y;
int score;
int dead; // n = 0 == dead!
} snake_t;
snake_t *new_snake(void);
void snake_move(snake_t *, int, int);
void snake_update(snake_t *);
void snake_draw(snake_t *);
snake_t *snake[SNAKE_MAX];
food_t *new_food(void)
{
food_t *f = malloc(sizeof(snake_t));
if (!f)
return (void *)0;
f->x = 15;
f->y = 10;
return f;
}
void food_move(food_t *f, int x, int y)
{
f->x = x;
f->y = y;
}
void food_update(food_t *f)
{
int rx, ry;
rx = rand() % GRID_SZ_DEFAULT;
ry = rand() % GRID_SZ_DEFAULT;
food_move(f, rx, ry);
}
void food_draw(food_t *f)
{
DrawRectangle(f->x * GRID_SZ_DEFAULT, f->y * GRID_SZ_DEFAULT,
GRID_SZ_DEFAULT, GRID_SZ_DEFAULT, COLOR_FG);
}
snake_t *new_snake(void)
{
snake_t *s = malloc(sizeof(snake_t));
if (!s)
return (void *)0;
s->x[0] = 5;
s->y[0] = 10;
s->dir_x = 1;
s->dir_y = 0;
s->score = 4;
s->dead = 0;
return s;
}
void snake_move(snake_t *s, int dir_x, int dir_y)
{
if (dir_x == 1) {
if (s->dir_x == -1) {
return;
}
}
if (dir_y == 1) {
if (s->dir_y == -1) {
return;
}
}
if (dir_x == -1) {
if (s->dir_x == 1) {
return;
}
}
if (dir_y == -1) {
if (s->dir_y == 1) {
return;
}
}
s->dir_x = dir_x;
s->dir_y = dir_y;
}
void snake_update(snake_t *s)
{
int k;
if (s->dead)
return;
k = GetKeyPressed();
switch (k) {
case KEY_D:
snake_move(s, 1, 0);
break;
case KEY_S:
snake_move(s, 0, 1);
break;
case KEY_A:
snake_move(s, -1, 0);
break;
case KEY_W:
snake_move(s, 0, -1);
break;
}
for (int i = s->score - 1; i > 0; i--) {
s->x[i] = s->x[i - 1];
s->y[i] = s->y[i - 1];
}
s->x[0] += s->dir_x;
s->y[0] += s->dir_y;
for (int i = 1; i < s->score; i++) {
if (s->x[0] == s->x[i] && s->y[0] == s->y[i]) {
s->dead = 1;
}
}
if (s->x[0] > (GRID_SZ_DEFAULT-1) || s->y[0] > (GRID_SZ_DEFAULT-1))
s->dead = 1;
if (s->x[0] < 0 || s->y[0] < 0)
s->dead = 1;
}
void snake_draw(snake_t *s)
{
if (!s)
return;
for (int i = 0; i < s->score; i++) {
DrawRectangle(s->x[i] * GRID_SZ_DEFAULT,
s->y[i] * GRID_SZ_DEFAULT,
GRID_SZ_DEFAULT,
GRID_SZ_DEFAULT,
COLOR_FG);
}
}
void __update(void);
void __draw(void);
void __init(void);
void __exit(void);
void __loop(void);
void __update(void)
{
for (int i = 0; i < SNAKE_MAX; i++) {
snake_update(snake[i]);
}
if (snake[0]->x[0] == food[0]->x && snake[0]->y[0] == food[0]->y) {
snake[0]->score++;
food_update(food[0]);
}
}
void __draw(void)
{
BeginDrawing();
ClearBackground(COLOR_BG);
for (int i = 0; i < SNAKE_MAX; i++) {
snake_draw(snake[i]);
}
for (int i = 0; i < FOOD_MAX; i++) {
food_draw(food[i]);
}
DrawText(TextFormat("%d", (snake[0]->score - SNAKE_SZ_DEFAULT)),
GRID_SZ_DEFAULT,
GRID_SZ_DEFAULT,
GRID_SZ_DEFAULT,
COLOR_FG);
if (snake[0]->dead) {
DrawText("game over",
GRID_SZ_DEFAULT,
2 * GRID_SZ_DEFAULT,
GRID_SZ_DEFAULT,
COLOR_FG);
}
EndDrawing();
}
void __init(void)
{
ClearWindowState(FLAG_WINDOW_RESIZABLE);
InitWindow(SCREEN_SZ_DEFAULT, SCREEN_SZ_DEFAULT, "Snake");
SetTargetFPS(SNAKE_GAME_SPEED);
snake[0] = new_snake();
food[0] = new_food();
}
void __exit(void)
{
for (int i = 0; i < FOOD_MAX; i++) {
free(food[i]);
}
for (int i = 0; i < SNAKE_MAX; i++) {
free(snake[i]);
}
CloseWindow();
}
void __loop(void)
{
__init();
do {
__update();
__draw();
} while (!WindowShouldClose());
__exit();
}
int main(void)
{
__loop();
return 0;
}
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