circle filling

This is a discussion on circle filling within the A Brief History of Cprogramming.com forums, part of the Community Boards category; Does anybody know of any circle filling algorithms that fade colors? I want to draw a filled in circle that ...

  1. #1
    l'Anziano DavidP's Avatar
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    Question circle filling

    Does anybody know of any circle filling algorithms that fade colors?

    I want to draw a filled in circle that in the center is white and fades to light blue and then fades to dark blue by the outer edge of the circle.

    I have an algorithm to draw a circle.....but I need some type of algorithm to fill a circle, especially the way I want to do it...and a circle filling algo is not near as easy as a rectangle filling algo....

    so anybody know of any?
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  2. #2
    Just because ygfperson's Avatar
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    use for loops to test each possible bit to fill; all bits inside the circle, or maybe for simplicity's sake, in a rectangle which circumscribes your circle. find its distance from the center, and use that as a multiplier in your color code calculation. (smaller distance = brighter colors). if a point isn't inside the circle, don't plot any pixel.

    note: this may be slow. there might be a better way to do it.
    Last edited by ygfperson; 06-07-2002 at 07:15 PM.

  3. #3
    ¡Amo fútbol!
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    Could you just use your circle drawing algorithm and from the center, draw bigger and bigger circles? As the number of circles increases, you can increment/decrement one of the RGB values. Not too sure how well this will work either.

  4. #4
    l'Anziano DavidP's Avatar
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    you would think that....but that can leave out some pixels if you think about it....because it doesnt draw a perfect circle
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  5. #5
    Its not rocket science vasanth's Avatar
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    yea i agree with that,, I tried doing that.. But betwween each circle there are very small gaps(4 gaps).. On each corner..... And dosent look good.. But i think there are functions like fill etc etc.. So check them out

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