105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
#include <stdlib.h>
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#include "snake.h"
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struct snake* add_snake(struct snake* snake, int x, int y) {
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struct snake* new_part = (struct snake*)malloc(sizeof(struct snake));
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if (new_part == NULL) {
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return snake;
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}
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new_part->x = x;
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new_part->y = y;
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new_part->next = snake;
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return new_part;
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}
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struct snake* remove_snake(struct snake* snake) {
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if (snake == NULL) {
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return NULL;
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}
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if (snake->next == NULL) {
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free(snake);
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return NULL;
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}
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struct snake* current = snake;
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while (current->next->next != NULL) {
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current = current->next;
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}
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free(current->next);
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current->next = NULL;
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return snake;
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}
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int is_snake(struct snake* snake, int x, int y) {
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struct snake* current = snake;
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while (current != NULL) {
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if (current->x == x && current->y == y) {
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return 1;
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}
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current = current->next;
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}
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return 0;
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}
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void free_snake(struct snake* sn) {
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while (sn != NULL) {
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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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if (state == NULL || state->snake == NULL) {
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return END_USER;
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}
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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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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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int food_index = -1;
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int items_left = 0;
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for (int 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_index = i;
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} else if (state->foodx[i] >= 0 && state->foody[i] >= 0) {
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items_left++;
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}
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}
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if (food_index >= 0) {
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state->foodx[food_index] = -1;
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state->foody[food_index] = -1;
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if (is_snake(state->snake, new_x, new_y)) {
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state->snake = add_snake(state->snake, new_x, new_y);
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return END_SNAKE;
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}
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state->snake = add_snake(state->snake, new_x, new_y);
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if (items_left == 0) {
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return END_FOOD;
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}
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return END_CONTINUE;
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} else {
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state->snake = remove_snake(state->snake);
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if (is_snake(state->snake, new_x, new_y)) {
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state->snake = add_snake(state->snake, new_x, new_y);
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return END_SNAKE;
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}
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state->snake = add_snake(state->snake, new_x, new_y);
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return END_CONTINUE;
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}
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}
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