Authors: Victor Streltsov,
Doug du Boulay & Syd Hall
Contact: Syd Hall,
Crystallography Centre, University of Western Australia,
Nedlands 6907, Australia
PREVUE is a screen-based interactive display
routine for manipulating text on plots. It outputs a plot
file
pre. The
prefile can be read by
PLOTX to produce hardcopy plots.
PREVUE enables the user to manipulate test strings in
a plot. The plot itself cannot be altered, but may be
enlarged or reduced in size during the text manipulation
(the output plot size is unaffected by this
resizing).
A character string may be moved by clicking on it
(which causes it to disappear from the screen) and then
clicking on the screen where the string is to be positioned
(where it becomes visible). The string is repositioned with
the bottom left corner at the mouse release position.
Eight control buttons are displayed at the top of the
plot screen.
-
The red
JUNK
button is the rubbish bin for unwanted
text. A string moved into this box will be deleted
from the output plot.
-
The two green circular
ZOOM buttons are for
enlarging and reducing the plot. These are for
display convenience only and do not affect the output
plot data.
-
The two green triangular
INCR
and
DECR
buttons are used to increase and
decrease the font size of all character strings by
10%.
-
The square green
GROUP
button, allows selective labels to be
moved collectively, or preferentially resized.
Selecting
GROUP
enables a new graphics mode whereby
labels can be selectively grouped. Selecting a
non-selected label, adds it to the group and
reselecting it deletes it from the group. Grouped
labels change color and remain grouped until the
GROUP
button is reselected. Right mouse
button clicking anywhere in the display window, which
is not occupied by a text label, combined with a drag
and release, EXCLUSIVE OR's the labels contained
within the rectanglular region indicated. Left mouse
button clicking anywhere in the display window, which
is not occupied by a text label, combined with a drag
and release, moves ther position of all grouped text
labels collectively. Pressing a mouse button over the
Junk
button permanently deletes all
currently grouped labels. There is no undo. Selecting
INCR/DECR
buttons, resizes only the grouped
labels. The
GROUP
mode is de-activated by reselecting
GROUP
-
The green
INPT
button is used to insert a new
character string. After clicking on the position for
the input string this is entered on the keyboard,
terminated by a carriage return.
-
The red
EXIT
button steps to the next plot file
frame if more than one exists. If there are no more
frames present on the input file PREVUE provides the
option to automatically invoke PLOTX to generate
hardcopy postscript or HPGL output. If iether of
these output formats is desired, a menu of format
controls for each format is invoked. Note that only
A3, A4 and landscape mode are available options for
HPGL. When choices are made choose the red
OK
control to terminate PREVUE and
continue.
The output file
prewill contain all
changes to the text data. Note that PREVUE will not read a
prefile unless it is
renamed.
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