Olin,

Thanks for the lead.  I believe this is the algorithm I was looking for.

As far as more detail, I would appreciate that, and I would be
interested 
in what you have to say.  So, if you want to "Go into detail", you could
contact
directly at my email address, and thus eliminate the censorship of the
admins.
However, I'll leave that decision up to you.  My email address is
jim@jpes.com.

I looked up some information on the algorithm you mentioned, and now
have some
reading and studying to do.   If I get stuck, or have questions, would
you mind
If I contact you for help?  If not, I understand.

Thanks again,

							Regards,

							  Jim

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Olin Lathrop
Sent: Wednesday, May 28, 2008 5:14 PM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC]: Algorithm wanted

PAUL James wrote:
> I have been searching for an algorithm that will tell me which byte in

> memory to write to, and which bit to turn on or off, to display my 
> data in graphical form on an LCD panel.

It sounds like you want the low levels of a rendering layer.  I used to
be a graphics guy and have created a few of these in hardware, software,
and firmware, including in a PIC.  I would go into detail, but not as
long as the admins continue to play games with my account and pass
everything I say past censors.

However, look up something called Bresenham's algorithm.  This is a
technique for drawing lines at arbitrary angles that is easily
implemented in a PIC.  In addition to that I would implement rectangles
and trapezoids with horizontal tops and bottoms at the low level, then
layer arbitrary convex polygons above the trapezoid routine.

Again, better information requires a better attitude from the admins.


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