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How to Rotate a Bitmap using Borland Delphi

Bitmap rotation is a graphic effect that Delphi does not natively offer.
http://www.delphi-central.com/tutorials/RotateBitmapBitBlt.aspx

Description:

Bitmap rotation is a graphic effect that Delphi does not natively offer. This article shows how to rotate a given image in 90-degree increments. It allows you to rotate any image 0, 90, 180 or 270 degrees.

With a little work, the code can be modified to rotate to any angle, but that is beyond the scope of this article.

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