Subject: Spheroid Graphics
From: Daniel Adamo <[email-masked]>
To: ATIG <[email-masked]>
Date: Sat, 13 Jul 2019 16:01:12 -0700

ATIG Members-

Those of you who have been receiving ATIG uploads over the past few years
(or longer) are familiar with trajectory plot annotations frequently
accompanied by a 3-D perspective of the origin body's appearance.  These
illustrations approximate the origin body's shape with spheroid graphics.
As my Swift programming odyssey continues, it has become desirable to
document these graphic operations as they were implemented from scratch in
an object-oriented development environment.  Resulting documentation is
captured in the first PDF file attached.  As always, your comments and
feedback on this material are welcome.

The second PDF file attached is a test of trajectory plot dump capability
from the Swift software.  This particular dump is equivalent to Figure 8 in
the first PDF file, and it will attempt to render when opened on your PC.
I'd appreciate feedback on any problems with this rendering, including your
attempts to scroll or zoom in/out to a reasonable degree.  Because the test
file isn't a bitmap, it should not appear pixelated (chunky) and curves
should remain smooth even on large-format displays.  On occasion, it will
make sense to distribute trajectory plots as PDF dumps, and I'd like some
measure of confidence these dumps are compatible with most members'
computing platforms.

My best wishes for a pleasant Summer 2019!

-Dan