#include <stdlib.h>
#include <stdio.h>
#include <curses.h>
#include <unistd.h>

#define ms 50000

int main(void)
{ 
	WINDOW * mainwin;

	if ( (mainwin = initscr()) == NULL ) {
		fprintf(stderr, "Error initialising ncurses.\n");
		exit(EXIT_FAILURE);
	}


	start_color();
	init_pair(1, COLOR_GREEN, COLOR_BLACK);
	init_pair(2, COLOR_CYAN, COLOR_BLACK);
	init_pair(3, COLOR_RED, COLOR_BLACK);
	init_pair(4, COLOR_YELLOW, COLOR_BLACK);
	attron(COLOR_PAIR(1));
	move(1, 10);
	for (int i = 1; i <= 19; i++) {
		move(1, (11 + i));
		addch('X');
		refresh();
		usleep(ms);
	}
	attron(COLOR_PAIR(2));
	for (int i = 1; i <= 19; i++) {
		move((1 + i),30);
		addch('X');
		refresh();
		usleep(ms);

	}
	attron(COLOR_PAIR(3));
	for (int i = 1; i <= 19; i++) {
		move(20, (30 - i));
		addch('X');
		refresh();
		usleep(ms);

	}
	attron(COLOR_PAIR(4));
	for (int i = 1; i <= 19; i++) {
		move((20 - i), 11);
		addch('X');
		refresh();
		usleep(ms);

	}

	refresh();
	getch();
	delwin(mainwin);
	endwin();
	refresh();;
}