Work completed 06/16 - 06/22

Began work on enhancement to Wigwam applet for making horizontal arcs, per the direction from the email below:


---------------------------- Original Message ----------------------------
Subject: RE: weekly update
From:    "Eglash, Ron" <eglash@rpi.edu>
Date:    Thu, June 16, 2011 10:24 pm
To:      johnsj3@cs.rpi.edu
--------------------------------------------------------------------------

Lets take this one step at a time. First step: allow "horizontal" arcs
so the kids can make the part of the wigwam that wraps around the
middle. Then we will worry about buckyballs.

Currently the applet only allows arcs that are "vertical". The user can
only rotate the arc around the Y axis. (Of course we don't mean just the
single Y axis at x=0, z=0. Rather we mean any line running parallel to
the Y axis.)

We need two more degrees of freedom:

1)    Such that the user can rotate the arc around the X axis (Of course
we don't mean just the single X axis at y=0, z=0. Rather we mean any
line running parallel to the X axis. And since they can rotate around Y,
that means it could even be parallel to the Z axis.).

2)    Such that the user can move the arc up higher or lower. We will
need to make sure the labels distinguish this from the parameter that
determine how tall the arc will be,

*****end email************************************

The approach is to leverage code for current functionality for making horizontal arcs.  Attempting to modify existing code to make it sufficiently generic to support both elements of functionality - making vertical arcs and horizontal arcs.  Once this is complete, will address the issue of being able to rotate the arc around the x-axis, hopefully, using code similar to that for rotating around the y-axis.  Finally, linear translation of the axis of axis will be modified/leveraged in the existing code base for supporting vertical translation of the axis for horizontal arcs.