/* File: inch4.c

   Draw an inch worm, inching across the screen.
   This time using a for loop.
   Now, draw the food pellet, too.

   Use functions to make our code more readable.

*/

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

void print_spaces(int n) ;
void clear_screen(void) ;

int main() {

int i ;

   for ( i=0 ; i <= 20 ; i++ ) {

      clear_screen() ;
      print_spaces(i) ;
      printf("_/\\_") ;
      print_spaces(21-i) ;
      printf("o\n") ;
      usleep(350000) ;

      clear_screen() ;
      print_spaces(i) ;
      printf("_____") ;
      print_spaces(21-i-1) ;
      printf("o\n") ;
      usleep(350000) ;
   }


   // Draw the inch worm  eating the pellet

   clear_screen() ;
   print_spaces(21) ;
   printf("_/\\_o\n") ;
   usleep(650000) ;

   clear_screen() ;
   print_spaces(21) ;
   printf("____o\n") ;
   usleep(450000) ;

   clear_screen() ;
   print_spaces(22) ;
   printf("_/\\o\n") ;
   usleep(450000) ;

   clear_screen() ;
   print_spaces(22) ;
   printf("___o_\n") ;
   usleep(450000) ;

   clear_screen() ;
   print_spaces(23) ;
   printf("_/o_\n") ;
   usleep(450000) ;

   clear_screen() ;
   print_spaces(24) ;
   printf("_o___\n") ;
   usleep(450000) ;

   clear_screen() ;
   print_spaces(25) ;
   printf("o/\\_\n") ;
   usleep(650000) ;

   clear_screen() ;
   print_spaces(25) ;
   printf("._____\n") ;
   usleep(350000) ;

   return 0 ;
}


/* function: print_spaces(n)
   Prints n spaces to the screen
   No return value
*/

void print_spaces(int n) {
   int j ;

   for ( j=1 ; j <= n ; j++ ) {
      printf(" ") ;
   }

   return ;
}


/* function: clear_screen()
   Use VT100 escape sequences to clear the screen.
*/

void clear_screen() {
   printf("\033[2J");   // clear screen
   printf("\033[H");    // go home

   return ;
}