Hi Louris -
If your view is centered on the atom from which you would like to draw the
line, and oriented the way you want it, you can achieve something similar to
what it sounds like you want with the following commands.
center myAtom
move x, -4 # `move` works in camera space
pseudoatom myMarker # creates a pseudoatom called “marker” at the center of
the screen
move x, 4 # move it back
distance myLine, myAtom, myMarker
To customize the line, have a look at the dash_* settings. You can show the
pseudoatom as a sphere as well. If you want to draw something else (triangle,
square, etc.) rather than a sphere, you’ll have to do it as a CGO, and the
“axes.py" script Takanori suggested will be helpful. You can get the
coordinates of the pseudoatom using
iterate_state<http://www.pymolwiki.org/index.php/Iterate_state>.
Hope that helps.
Cheers,
Jared
--
Jared Sampson
Xiangpeng Kong Lab
NYU Langone Medical Center
http://kong.med.nyu.edu/
On Nov 19, 2014, at 7:14 AM, Feitsma, L.J.
<l.j.feit...@uu.nl<mailto:l.j.feit...@uu.nl>> wrote:
Hi all,
I have a small question about transformations with the view matrix in pymol,
since I’m not very familiar with the architecture of the matrix.
E.g. I take some coordinates [x1,y1,z1], and using cgo objects, I want to draw
a line/triangle/square to a point distance 4 to the right on the screen (so not
4 in object x-coördinates!).
How can I use the information in [0:8] of the view matrix to calculate object
coordinates [x2, y2, z2] needed to draw the line between [x1, y1, z1] and [x2,
y2, z2]?
Does anyone has an example script, or link about which matrix operation I need
for this?
Kind regards,
Louris Feitsma
Crystal and Structural Chemistry
Utrecht University
Padualaan 8
3584 CH Utrecht
The Netherlands
P: +31-30-2539182
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