int16_t diff_x = yx_cell->x - yx_eye->x;
uint8_t indent = yx_eye->y % 2;
char * dir = dir_from_delta(indent, diff_y, diff_x);
int16_t diff_x = yx_cell->x - yx_eye->x;
uint8_t indent = yx_eye->y % 2;
char * dir = dir_from_delta(indent, diff_y, diff_x);