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authorJuan Manuel Tomás <jtomas1815@gmail.com>2022-08-04 21:41:17 -0300
committerJuan Manuel Tomás <jtomas1815@gmail.com>2022-08-04 21:41:17 -0300
commit76db1d24584618205b4e3cb8c94e78ed005e5d40 (patch)
treed038d43f938e2aa2b6dd4df7e4cebfb1bbbfd34b
downloadsnake-76db1d24584618205b4e3cb8c94e78ed005e5d40.tar.gz
snake-76db1d24584618205b4e3cb8c94e78ed005e5d40.zip
Initial CommitHEADmain
-rw-r--r--.gitignore1
-rw-r--r--Makefile2
-rw-r--r--snek.c101
3 files changed, 104 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1b9cfe2
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+snek
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..0f86f66
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+all:
+ gcc snek.c -lSDL2 -o snek
diff --git a/snek.c b/snek.c
new file mode 100644
index 0000000..cbe8dd6
--- /dev/null
+++ b/snek.c
@@ -0,0 +1,101 @@
+#include <SDL2/SDL.h>
+#include <stdlib.h>
+
+#define UP 0
+#define DOWN 1
+#define LEFT 2
+#define RIGHT 3
+
+int pos(int x, int y, int width, int height) {
+ return (x % width) + (y % height) * width;
+}
+
+int main() {
+ SDL_Init(SDL_INIT_VIDEO);
+ SDL_Window *win = SDL_CreateWindow("Snek automata", 0, 0, 800, 600, 0);
+ SDL_Renderer *ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);
+
+ int width = 40;
+ int height = 20;
+ int *grid = calloc(width * height, sizeof(int));
+ int direction = RIGHT;
+ int snake_length = 3;
+ grid[pos(10, 10, width, height)] = 1;
+ grid[pos(15, 15, width, height)] = 1 << 15;
+
+ SDL_Event e = {0};
+ int quit = 0;
+ while (e.type != SDL_QUIT && !quit) {
+ SDL_PollEvent(&e);
+ int state_len = -1;
+ const Uint8 *state = SDL_GetKeyboardState(&state_len);
+ if (state[SDL_SCANCODE_UP] && direction != DOWN) {
+ direction = UP;
+ }
+ if (state[SDL_SCANCODE_DOWN] && direction != UP) {
+ direction = DOWN;
+ }
+ if (state[SDL_SCANCODE_LEFT] && direction != RIGHT) {
+ direction = LEFT;
+ }
+ if (state[SDL_SCANCODE_RIGHT] && direction != LEFT) {
+ direction = RIGHT;
+ }
+ SDL_SetRenderDrawColor(ren, 20, 20, 20, 255);
+ SDL_RenderClear(ren);
+ for (int i = 0; i < width * height; i++) {
+ int cell = grid[i] & 0xffff;
+ if (cell == (1 << 15) || cell == 0) {
+ int x = 0;
+ int y = 0;
+ switch (direction) {
+ case UP: y++; break;
+ case DOWN: y+=height-1; break;
+ case LEFT: x++; break;
+ case RIGHT: x+=width-1; break;
+ }
+ int peek = grid[pos(i % width + x, i / width + y, width, height)] & 0xffff;
+ grid[i] = (cell << 16) | cell;
+ if (peek == 1) {
+ grid[i] = (1 << 16) | cell;
+ if (cell == (1 << 15)) {
+ snake_length++;
+ int new_pos = pos(rand(), rand(), width, height);
+ while (grid[new_pos] & 0xffff != 0) {
+ new_pos = pos(rand(), rand(), width, height);
+ }
+ grid[new_pos] |= ((1 << 15) << 16) | (1 << 15);
+ }
+ }
+ }
+ if (cell > 0 && cell < (1 << 15)) {
+ if (cell <= snake_length) {
+ grid[i] = ((cell + 1) << 16) | cell;
+ }
+ }
+ }
+ for (int i = 0; i < width * height; i++) {
+ grid[i] = grid[i] >> 16;
+
+ int cell = grid[i] & 0xffff;
+ if (cell == (1 << 15)) {
+ SDL_SetRenderDrawColor(ren, 200, 200, 0, 255);
+ } else if (cell < (1 << 15) && cell > 0) {
+ SDL_SetRenderDrawColor(ren, 255, 255, 255, 255);
+ } else {
+ SDL_SetRenderDrawColor(ren, 40, 40, 40, 255);
+ }
+ int y = (i / width) * 11;
+ int x = (i % width) * 11;
+ int w = 10;
+ int h = 10;
+ SDL_Rect r = { x, y, w, h };
+ SDL_RenderFillRect(ren, &r);
+ }
+
+ SDL_RenderPresent(ren);
+ SDL_Delay(50);
+ }
+ SDL_Quit();
+ return 0;
+}