10.4
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91
cv9/snake.c
Normal file
91
cv9/snake.c
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#include "snake.h"
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#include <stdlib.h>
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struct snake* add_snake(struct snake* snake, int x, int y) {
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struct snake* new_head = (struct snake*)malloc(sizeof(struct snake));
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if (!new_head) {
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// Memory allocation failed
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return NULL;
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}
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new_head->x = x;
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new_head->y = y;
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new_head->next = snake;
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return new_head;
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}
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struct snake* remove_snake(struct snake* snake) {
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if (!snake) {
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// Snake is empty
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return NULL;
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}
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struct snake* new_head = snake->next;
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free(snake);
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return new_head;
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}
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int is_snake(struct snake* snake, int x, int y) {
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while (snake) {
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if (snake->x == x && snake->y == y) {
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return 1; // Found snake part at given coordinates
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}
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snake = snake->next;
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}
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return 0; // Snake part not found
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}
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void free_snake(struct snake* sn) {
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while (sn) {
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struct snake* temp = sn;
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sn = sn->next;
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free(temp);
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}
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}
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int step_state(struct state* state) {
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// Calculate new position of the snake head
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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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// Check if snake hits a wall
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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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// Check if snake hits itself
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if (is_snake(state->snake->next, new_x, new_y)) {
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return END_SNAKE;
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}
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// Check if snake eats food
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int i;
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for (i = 0; i < FOOD_COUNT; i++) {
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if (state->foodx[i] == new_x && state->foody[i] == new_y) {
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// Food eaten, mark it as negative
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state->foodx[i] = -1;
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state->foody[i] = -1;
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// Add new snake part at the food position
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state->snake = add_snake(state->snake, new_x, new_y);
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if (state->snake == NULL) {
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// Memory allocation failed
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return END_USER;
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}
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// Check if no food left
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int food_left = 0;
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for (int j = 0; j < FOOD_COUNT; j++) {
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if (state->foodx[j] >= 0 && state->foody[j] >= 0) {
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food_left = 1;
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break;
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}
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}
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if (!food_left) {
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return END_FOOD; // No food left
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}
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return END_CONTINUE; // Food eaten, continue the game
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}
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}
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// Add new snake part on the new position and remove the last part of the snake
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state->snake = add_snake(state->snake, new_x, new_y);
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state->snake = remove_snake(state->snake->next);
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return END_CONTINUE;
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}
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