Sprite creation

This is a discussion on Sprite creation within the Game Programming forums, part of the General Programming Boards category; Hi everyone. I need an automated way of rotating bitmaps. I am working on a 2D RTS... my engine is ...

  1. #1
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    Sprite creation

    Hi everyone.

    I need an automated way of rotating bitmaps.

    I am working on a 2D RTS... my engine is more or less working... but there's a problem when it comes to the art...
    I not an artist by I can draw pretty well, and pixel art is interesting... so, I decided to make the sprites for my game all by myself.,, the results so far are pretty nice... but I've encountered a problem...

    In my game, each unit can turn to 8 directions. I need a different animation for the following modes:
    idle - 1 frame of animation
    shootting/attacking - about 6 frames of animation
    dead - 5 frames of animation (different levels for corpse rotting)
    sneaking...

    and so on and on...

    I have no problem making my frames... but rotating each frame 8 times and then putting it in its right spot in the bitmap grid is quite annoying!!!! don't forget that for some directions I must rotate by 45, 135 or so degrees... and paintbrush simply doesn't do it.

    details:
    each bitmap holds a a grid of squares, each square is a different frame... during runtime my sprite manager knows which column and row it needs from the sprite map and it clips that...

    So basicaly... I need my program no to just rotate each "square" in the bitmap by itself... but also to keep the correct order and direction of squares in the resulting bitmap...

    WHAT TOOL CAN I USE?! I AM GETTING NUTS LOOKING IT UP!
    HELP!

  2. #2
    glo
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    Photoshop (and probably the likes too) has a pretty easy way to record actions.
    As long as you keep your units centered at the middle of the sprite, no tweaking should be needed other than hitting the Play Action button.

    edit: I should also note that the mspaint doesn't use anti aliasing for rotation - which is another sweet feature graphic tools nowadays offer.
    Last edited by glo; 12-09-2006 at 05:18 AM.

  3. #3
    Super Moderator VirtualAce's Avatar
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    You obviously do not understand how modern hardware works. Rotation is simple. You don't rotate the bitmap you rotate the quad that the bitmap/texture is bound to.

    No more rotating actual bitmaps and thank goodness b/c it was a time consuming operation.

  4. #4
    glo
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    Well, yes, if your units are viewed from the top, there really isn't need to have 8 bitmaps for every animation set, like Bubba says.

  5. #5
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    This is someting that I need to do aswell, what code do you use to make an image rotate?

  6. #6
    glo
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    Graphic libs have functions for rotating quads (such as opengl's glRotatef() )

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    Reactions

    Thank you so much for all your responses.
    Let my clarify my problem:
    I use SDL... and all my units ARE viewed from above... I need to find a fast, cheap way to rotate my sprites... during gameplay if possible, but also to create 8 separate animations if needed.

  8. #8
    In the Land of Diddly-Doo g4j31a5's Avatar
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    Quote Originally Posted by Warlax
    Thank you so much for all your responses.
    Let my clarify my problem:
    I use SDL... and all my units ARE viewed from above... I need to find a fast, cheap way to rotate my sprites... during gameplay if possible, but also to create 8 separate animations if needed.
    You can use SDL with openGL. Or use SDL_GFX's rotoZoom.

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