removing parts of an image?

This is a discussion on removing parts of an image? within the Game Programming forums, part of the General Programming Boards category; (allegro) hi in my game i have a spaceship, enemyships, and a background which by the time is black but ...

  1. #1
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    removing parts of an image?

    (allegro)


    hi

    in my game i have a spaceship,
    enemyships, and a background
    which by the time is black but i will
    make some stars so that it looks like
    the ships is moving.


    the problem i have is how do i remove
    the ugly black parts aroung my ship.bmp so when i move over another image only
    the spaceship parts will show(not the whole black rectangle)

    anyone know how its done or what its called
    thaks, pode

  2. #2
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    There is a real easy way in sdl to do transpearacy so i would think that you could do it in allegro too.

  3. #3
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    yeah but how?

  4. #4
    Evil Sock Puppet MadHatter's Avatar
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    if you're using draw_sprite() (and probably others) just make the transparent part of your image that pink colour (i think the RGB is 255, 0, 255).
    If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrariwise, what it is, it wouldn't be, and what it wouldn't be, it would. You see?

  5. #5
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    sorry i did'nt get that,
    what fuction should i use?
    can anyone show me an example on how its done please

  6. #6
    Rambling Man
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    pode, no offense but a lot of your questions are very simple questions, and you could easily find the answers if you took the time to find them. a good place to go search for these answers is at allegro.cc

    Anways, in your actual image editor load your bmp. The parts in the bmp that you don't want to show up make those parts the RGB color of (255, 0, 255). Basically it's the brightest pink you can possibly get! For the functions you are going to want to use either draw_sprite() or masked_blit().

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    Go learn this

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