Thread: GotoXY Problem

I'm having problem with using a gotoxy function to move the cursor around the screen (as part of game controls).

Code:

#define GET getche() 

done = FALSE;
while(!done)	
{
        i = GET; 
        if (i == UPKEY)
        {
              gotoxy(x, y--);
        }
        if (i == DOWNKEY)
        {
              gotoxy(x, y++);
        }
        if (i == LEFTKEY)
        {
              gotoxy(x--, y);
        }
        if (i == RIGHTKEY)
        {
              gotoxy(x++, y);
        }

I'm currently using getche() as I wanted to see if the console was picking up the correct input and it is. The problem is that when I hit a direction key, I get a delay in moving in the proper direction. The cursor will go one extra step before it changes. This is easier to explain using a screenshot and getche()

http://img291.imageshack.us/img291/9655/consolepr2.jpg

My brain is telling me that this will be caused by the incrementing/decrementing method I'm using with gotoxy, but the assignment says we HAVE to use gotoxy as the controls and I can't think of a better way to do it.

Thanks for any help

Me thinks gotoxy(x, --y); etc

Good old side effects, gets 'em every time.

Code:

        if (i == UPKEY)
        {
              y--;
        }
        if (i == DOWNKEY)
        {
              y++;
        }
        if (i == LEFTKEY)
        {
              x--;
        }
        if (i == RIGHTKEY)
        {
              x++;
        }
        gotoxy( x, y );

Get rid of that define as well. It's pretty much pointless.

even better, use a switch

Originally Posted by Desolation

Get rid of that define as well. It's pretty much pointless.

It's not pointless, it means he can easily change it if he goes to a compiler that doesn't support getche()...

Originally Posted by zacs7

It's not pointless, it means he can easily change it if he goes to a compiler that doesn't support getche()...

I would imagine it would be better to define it to at least look like a function, rather than looking like some bland global const variable.