Updating display on screen?

This is a discussion on Updating display on screen? within the C Programming forums, part of the General Programming Boards category; I wrote a simple program to print a grid of 0s on the screen, and move a 1 around with ...

  1. #1
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    Updating display on screen?

    I wrote a simple program to print a grid of 0s on the screen, and move a 1 around with user input from the keyboard (eventually, the goal is a "snake" game).

    It works fine. I hit W, it moves the 1 up one space. I hit A, it moves it to the left, etc.

    The problem I'm having is that each time it prints a whole new box. I would much rather have it update the same box each time I hit a key, and I have no idea how to do that.

    I'm currently using this to print my box each time I update the location of my 1:

    Code:
    for(i=0;i<boxsize;i++){
       	for(j=0;j<boxsize;j++){
        		printf("%d",grid[i][j]);
    }
      	printf("\n");
    }
    How would I make it draw the box only once, and simply update "pixels" in the array as I enter input?

  2. #2
    Kernel hacker
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    Use printf("%d\r", ...) to print on the same line. Note that you may have to use fflush(stdout) to make sure the data is ACTUALLY printed.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
    Registered User guesst's Avatar
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    Lehi, UT
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    Curses. PDCurses for windows.

    Okay, a little more robust of an answer is "cursor control (pixels as you erroniously call them) is not a part of the standard C library and requires external library support." Curses is a standardized library that you can use to acomplish what you're looking for.

    And it just so happens that I've written a little tutorial for setting up PDCurses if you have Code::Blocks.
    Type-ins are back! Visit Cymon's Games at http://www.cymonsgames.com for a new game every week!

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