[Clusterviz-devel] panning proposal

[<K.W...@gm...>]

Hello,
a few minutes ago I posted two files for the panning feature. Since I made
several changes 
(which I sketch below), I did not post diffs but the whole files. Please
tell me if there is 
a better way to post.

In this proposal, I tried to keep the things simple. There is even no pan
matrix kept, but
rather the center member variable is put back in use. Furthermore, I moved
the lastx/y member
variables to the clusterdisplay class. They are passed as parameters to
gltbZoom and gltbPan.
I think this is a good idea since lastx/y stored a mouse state, and the
clusterdisplay does
also store some mouse state (button and state) -- so why not store it in one
place? I also
removed gltbMouse from the trackball class for the same reason. And there is
a second reason: 
I suggest removing all glut code from the trackball class, since maybe
someday glut might 
not suffice anymore and then it would be nice to reuse the trackball class.

At last, I commented out for clarity some unused code in clusterdisplay.py
(but all I changed
were the mouse and motion methods.) And I ran a ":%s/;$//g" in vim on the
trackball.py, 
for aesthetical reasons ;-)

The scale parameter in trackball.gltbPan needs to be set more carefully, but
this requires
good knowledge of gluPerspective. If you like the overall proposal, I will
look into it.

I also tried the 4-D projection feature and it seems work pretty well! It
raises if I choose
dim 4 on a 3-dimensional data set, though. I also like the script which
generates the
data. Wouldn't it be nice to use it directly rather than by way of a
intermediary data file?

Kind regards,
Karsten.

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