Thanks, Eric. This text hasn't been edited for a long time, and these are
very helpful suggestions. Take a look at the documentation now and tell me
what you think.
On Sat, Aug 11, 2012 at 5:08 PM, Eric Martz <[email protected]>wrote:
> Dear Bob,
>
> 1. I have been perpetually confused about the set echo command. Every time
> I use it I have been befuddled and frustrated. Finally today I think I
> understand it. What I missed all these years is that TOP, MIDDLE, and
> BOTTOM are echo IDs. You do state this in one place but it is not "out
> front" and not what I expected. My expectation has been that "TOP LEFT" and
> "TOP RIGHT" could have two separate texts, and that one could do "set echo
> myecho top left". All wrong. So I suggest that you put the following
> paragraph below the table under "set echo":
>
> TOP, MIDDLE, and BOTTOM are predefined echo IDs. Adding LEFT, CENTER, or
> RIGHT as in "set echo MIDDLE CENTER" specifies an alignment for each of
> these three predefined echo IDs. You cannot have two separate echos that
> use the single predefined TOP ID. Thus, after "set echo top left", if you
> "set echo top right" it will move the echo text in the TOP ID to the right,
> rather than creating a position for separate text. Further, "set echo
> myecho top" makes no sense -- you cannot use TOP as a position for an echo
> with an ID (myecho). Instead, you could "set echo mytopright 100% 100%".
> This creates a separate echo from "set echo top left" which is aligned to
> the top right. The two echos have IDs "top" and "mytopright". If you want
> to right-align multi-line text in "mytopright", you also need "set echo
> mytopright right".
>
> 2. Under "set echo NONE" please add:
>
> See also the "Default settings" paragraph above.
>
> 3. In the "set echo" table, in the row for "TOP, MIDDLE, BOTTOM", I would
> reword as follows:
>
> Predefined 2D position echo IDs for quick placement of text. Each of these
> three special predefined echo ID's can only have one of three predefined
> alignments: LEFT, CENTER, or RIGHT.
>
> (The existing description for comparison:
> Three special 2D positions are also defined for quick placement of text.
> These three special echos can only have one of three predefined positions:
> LEFT, CENTER, or RIGHT.)
>
> 4. In the doc section "label or labels" I suggest adding a new subsection,
> below. Recently I wanted to attach a label to the average position of a
> group of atoms, and after reading the "label" section carefully, I gave up.
> It never occurred to me to look under "echo"!
>
> *Label positioning
>
> *Each label is attached to an atom. The position of a label relative to
> the center of its atom can be adjusted with "set labelAlignment" and "set
> labelOffset". If you want to position text at the average position of a
> group of atoms (or drawn objects, or an arbitrary x,y,z position), it can
> be done with echo: please see "set echo id {x y z}" and "set echo id {
> [atom-expression] }".
>
> Jmol rocks! -Eric
>
>
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--
Robert M. Hanson
Larson-Anderson Professor of Chemistry
Chair, Chemistry Department
St. Olaf College
Northfield, MN
http://www.stolaf.edu/people/hansonr
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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