Re: How to rotate a bitmap?


"Ekkehard Domning" <edo@xxxxxxxx> wrote in message
news:d8e8ls$p4b$03$1@xxxxxxxxxxxxxxxxxxxx
> Hallo Brent,
>
> Brent W. Hughes wrote:
> > How do I rotate a bitmap (say 13 degrees)?
> not a very simple job, but take a look to
>
> http://www.efg2.com/Lab/ImageProcessing/RotateScanline.htm
>

There are also world transforms but they aren't supported on all OS
versions.

SDK Win32
find "bitmap,rotation"
"Rotation Algorithm Derivation"

mapping between points, antialiasing etc, many PhDs have been
written on it
square pixels into arc coordinates ,squaring the circle :-)

keep the original and refresh to new rotation until complete,remapping
each rotation will lead to scrambled images.







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