Re: How to rotate an bitmap / image

On 7/4/21 9:40 PM, Phil wrote:

>
> I have a jpeg image that I'd like to rotate about it's bottom centre 
> point.

I'm going to focus on this for a moment, rather than the more important 
questions you asked.

If you rotate an image 90 degrees around it's bottom center point, 3/4 
of the image will be outside the bounding box.  In ASCII art:

+---+---+
| A | B |
+---+---+
| C | D |
+---+---+

Now, let's rotate 90 degrees clockwise about the bottom center (pretend 
the letters are rotated, too):

+---+---+
|       |
+   +---+
|   | C | A
+---+---+
       D   B

See what I mean?  Are you sure you don't want to rotate around the center?

-- 
Tim Roberts, [email protected]
Providenza & Boekelheide, Inc.

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