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a2/snake.c
163
a2/snake.c
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#include <stdio.h>
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#include "snake.h"
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#include <stdlib.h>
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#include <time.h>
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#define FOOD_COUNT 3
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#define MAX_SNAKE_LENGTH 100
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// Define the direction constants
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#define UP 0
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#define LEFT 1
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#define DOWN 2
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#define RIGHT 3
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struct state {
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int width;
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int height;
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int snake_length;
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int snake_x[MAX_SNAKE_LENGTH];
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int snake_y[MAX_SNAKE_LENGTH];
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int foodx[FOOD_COUNT];
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int foody[FOOD_COUNT];
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int sx;
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int sy;
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};
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// Function prototypes
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void init_state(struct state* state, int width, int height);
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void draw_state(struct state* state);
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void process_input(struct state* state);
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int step_state(struct state* state);
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void generate_food(struct state* state);
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int is_snake(struct state* state, int x, int y);
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void free_snake(struct state* state);
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// Add a new segment to the snake
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void add_snake(struct state* state, int x, int y) {
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state->snake_x[state->snake_length] = x;
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state->snake_y[state->snake_length] = y;
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state->snake_length++;
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}
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// Check if the given position is occupied by the snake
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int is_snake(struct state* state, int x, int y) {
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for (int i = 0; i < state->snake_length; i++) {
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if (state->snake_x[i] == x && state->snake_y[i] == y) {
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return 1;
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// Pridá novú odmenu na náhodnú voľnú pozíciu v rámci hracej plochy
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void add_food(struct state* state) {
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int placed = 0;
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while (!placed) {
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int x = rand() % state->width;
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int y = rand() % state->height;
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if (!is_snake(state->snake, x, y)) {
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state->foodx[state->foods] = x;
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state->foody[state->foods] = y;
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state->foods++;
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placed = 1;
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}
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}
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return 0;
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}
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// Free the memory allocated for the snake
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void free_snake(struct state* state) {
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// No dynamic memory allocation for the snake in this implementation
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}
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// Move the snake by one step
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int step_state(struct state* state) {
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// Move the snake body
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for (int i = state->snake_length - 1; i > 0; i--) {
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state->snake_x[i] = state->snake_x[i - 1];
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state->snake_y[i] = state->snake_y[i - 1];
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// Vypočíta novú pozíciu hlavy hada
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int new_x = state->snake->x + state->sx;
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int new_y = state->snake->y + state->sy;
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// Overí, či je nová pozícia mimo hracej plochy
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if (new_x < 0 || new_x >= state->width || new_y < 0 || new_y >= state->height) {
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return END_WALL;
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}
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// Move the snake head
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state->snake_x[0] += state->sx;
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state->snake_y[0] += state->sy;
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// Check for collisions with walls
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if (state->snake_x[0] < 0 || state->snake_x[0] >= state->width ||
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state->snake_y[0] < 0 || state->snake_y[0] >= state->height) {
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return 1; // Collision with wall
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// Overí, či je nová pozícia na tele hada
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if (is_snake(state->snake, new_x, new_y)) {
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return END_SNAKE;
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}
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// Check for collisions with itself
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for (int i = 1; i < state->snake_length; i++) {
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if (state->snake_x[i] == state->snake_x[0] && state->snake_y[i] == state->snake_y[0]) {
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return 2; // Collision with itself
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}
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}
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// Check for collisions with food
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// Overí, či je na novej pozícii odmena
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for (int i = 0; i < FOOD_COUNT; i++) {
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if (state->snake_x[0] == state->foodx[i] && state->snake_y[0] == state->foody[i]) {
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// Increase the snake length
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state->snake_length++;
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if (state->snake_length >= MAX_SNAKE_LENGTH) {
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return 3; // Snake length exceeds the maximum
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}
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// Move the food to a new random position
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state->foodx[i] = rand() % state->width;
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state->foody[i] = rand() % state->height;
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return 0; // Food eaten
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}
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}
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return 0; // No collision
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}
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void init_state(struct state* state, int width, int height) {
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state->width = width;
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state->height = height;
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state->snake_length = 1;
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state->snake_x[0] = width / 2;
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state->snake_y[0] = height / 2;
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state->sx = 0;
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state->sy = -1; // Start moving upward
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for (int i = 0; i < FOOD_COUNT; i++) {
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state->foodx[i] = rand() % width;
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state->foody[i] = rand() % height;
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}
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}
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void generate_food(struct state* state) {
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for (int i = 0; i < FOOD_COUNT; i++) {
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state->foodx[i] = rand() % state->width;
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state->foody[i] = rand() % state->height;
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}
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}
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void draw_state(struct state* state) {
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for (int y = 0; y < state->height; y++) {
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for (int x = 0; x < state->width; x++) {
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if (x == state->snake_x[0] && y == state->snake_y[0]) {
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printf("H"); // Snake head
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} else if (is_snake(state, x, y)) {
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printf("S"); // Snake body
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if (state->foodx[i] == new_x && state->foody[i] == new_y) {
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state->foodx[i] = -1;
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state->foody[i] = -1;
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state->foods_eaten++;
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add_food(state); // Pridá novú odmenu
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state->snake = add_snake(state->snake, new_x, new_y);
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if (state->foods_eaten == FOOD_COUNT) {
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return END_FOOD;
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} else {
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int is_food = 0;
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for (int i = 0; i < FOOD_COUNT; i++) {
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if (state->foodx[i] == x && state->foody[i] == y) {
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is_food = 1;
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break;
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}
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}
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printf(is_food ? "F" : ".");
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return END_CONTINUE;
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}
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}
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printf("\n");
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}
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}
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// Odstráni poslednú časť hada
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state->snake = add_snake(state->snake, new_x, new_y);
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state->snake = remove_snake(state->snake);
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return END_CONTINUE;
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}
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