Trouble moving characters with C in a simple CLI program

WindowsBurner · 12-10-2003, 08:21 AM

Hey all,
I'm trying to get a hang of programming with C in CLI.And the problem I'm working on is moving a character across the screen like : You press "a" and "@" moves up a line.And the "@" 's previous position is clear.I could probably do it by clearing the screen everytime the character is moved.....but its very hard on the eyes.If somebody could post a snippet of code showing how to do this...or give me a good link to a page explaining how then I would greatly appreciate it.

Thanks in advance,

WindowsBurner

llama_meme · 12-10-2003, 08:49 AM

You won't be able to do this using just the C standard library. I think your best bet would be to use the ncurses library.

Alex

WindowsBurner · 12-10-2003, 12:40 PM

Thanks ... I'll try learning ncurses and see if it works

nibbler · 12-11-2003, 02:39 AM

try this is you need help, don't forget to compile with -lcurses.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <ncurses.h>

int main()
{

	if ((initscr())==NULL)
	{
		perror("initsrc()");
		return(EXIT_FAILURE);		
	}	
	noecho();
	int maxx,maxy,curx,cury;
	char ch;
	getmaxyx(stdscr,maxy,maxx);
	curx=maxx/2;
	cury=maxy/2;
	mvaddch(cury,curx,'@'); 
	do
	{
		ch=getch();
		mvaddch(cury,curx,' ');
		if (ch=='a' && curx>1) curx--;
		if (ch=='s' && cury<maxy-2) cury++;
		if (ch=='w' && cury>1) cury--;
		if (ch=='d' && curx<maxx-2) curx++;
		mvaddch(cury,curx,'@');
		refresh();
	}while (ch!=27); // ESC to exit
	endwin();		
	return(EXIT_SUCCESS);
}

WindowsBurner · 12-11-2003, 08:00 AM

Thanks nibbler

! I was working on writing my own engine in ncurses...but I never actually learned it.... I just glanced at it a bit... not only will this help me with my rpg and text editor but looking through your code is helping me to understand C even better.

Thanks again