Re: Information Outlet

[EnderWiggenRules@aol.com]

In a message dated 3/12/00 8:16:12 PM Central Standard Time, 
anime6@earthlink.net writes:

<< I need to find a good explaination on how to rotate bitmaps.  I was 
thinking
 of an algorithm.  Maybe take each line of the bitmap, rasterize it using the
 "Best Line" algorithm, and then draw each line like a line with each pixel
 being a pixel from that line (stored in a stack or a queue).  The only
 things wrong with this is:
 A)It's slow.
 B)There would be empty spaces.
  >>

Do it backwards - don't rotate the bitmap and store it. Rather, start at the 
end bitmap, go through it pixel by pixel. For each pixel in the new bitmap, 
find a corresponding pixel in the original (or if there's no pixel, indicate 
it). This gets rid of the empty spaces and it can be optimized quite a bit. 
I'll be making some how-tos about this pretty soon. 
-Ender Wiggin
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