DESCRIPTION
Xdvi is a program which runs under the X window system. It
is used to preview DVI files, such as are produced by TeX.
This program has the capability of showing the file shrunken
by various (integer) factors, and also has a ``magnifying
glass'' which allows one to see a small part of the unshrunk
image momentarily.
Also, before displaying any page or part thereof, it checks
to see if the dvi file has changed since the last time it
was displayed. If this is the case, then xdvi will reini-
tialize itself for the new dvi file. For this reason, ex-
posing parts of the xdvi window while TeX is running should
be avoided. This feature allows you to preview many ver-
sions of the same file while running xdvi only once.
OPTIONS
In addition to specifying the .dvi file (with or without the
.dvi), Xdvi supports the following command line options. If
the option begins with a `+' instead of a `-', the option is
restored to its default value. By default, these options
can be set via the resource names given in parentheses in
the description of each option.
+page
Specifies the first page to show. If + is given
without a number, the last page is assumed; the first
page is the default.
-s shrink
(.shrinkFactor) Defines the initial shrink factor. The
default value is 3.
-S density
(.densityPercent) Determines the density used when
shrinking bitmaps for fonts. A higher value produces a
lighter font. The default value is 40.
-p pixels
(.pixelsPerInch) Defines the size of the fonts to use,
-altfont font
(.altFont) Declares a default font to use when the font
in the dvi file cannot be found. This is useful, for
example, with PostScript <tm> fonts.
-l (.listFonts) Causes the names of the fonts used to be
listed.
-rv (.reverseVideo) Causes the page to be displayed with
white characters on a black background, instead of vice
versa.
-bw width
(.borderWidth) Specifies the width of the border of the
window.
-borderwidth width
Same as -bw, above.
-fg color
(.foreground) Determines the color of the text (fore-
ground).
-foreground color
Same as -fg, above.
-bg color
(.background) Determines the color of the background.
-background color
Same as -bg, above.
-hl color
(.highlight) Determines the color of the page border.
-bd color
(.borderColor) Determines the color of the window bord-
er.
-cr color
(.cursorColor) Determines the color of the cursor. The
default is the foreground color.
-thorough
(.thorough) Xdvi will usually try to ensure that over-
strike characters (e.g. \notin) are printed correctly.
On monochrome displays, this is always possible with
one logical operation, either and or or. On color
displays, however, this may take two operations, one to
set the appropriate bits and one to clear other bits.
If this is the case, then by default xdvi will instead
use the copy operation, which does not handle over-
striking correctly. The ``thorough'' option chooses
the slower but more correct choice.
-margins inches
(.margins) Specifies the size of both the top margin
and side margin. This can be a decimal number, e.g.,
1.5. It determines the ``home'' position of the page
within the window as follows. If the entire page fits
in the window, then the margin settings are ignored.
If, even after removing the margins from the left,
right, top, and bottom, the page still cannot fit in
the window, then the page is put in the window such
that the top and left margins are hidden, and presum-
ably the upper left-hand corner of the text on the page
will be in the upper left-hand corner of the window.
Otherwise, the text is centered in the window. See
also `H' under the KEYSTROKES section.
-sidemargin inches
(.sideMargin) Specifies the side margin (see above).
-topmargin inches
(.topMargin) Specifies the top and bottom margins (see
above).
-mgs[n] size
(.magnifierSize[n]) Specifies the size of the window to
be used for the ``magnifying glass'' for Button n. See
the MOUSE ACTIONS section. Defaults are 200, 350, 600,
900, and 1200.
-mgs size
Same as -mgs1, above.
=geometry
(*geometry) Specifies the initial geometry of the win-
dow.
-geometry geometry
Same as above.
#geometry
(.iconGeometry) Specifies the initial position for the
icon.
-display host:display
Specifies the host and screen to be used for displaying
the dvi file. This is normally obtained from the en-
vironment variable ``DISPLAY.''
KEYSTROKES
Xdvi recognizes the following keystrokes when typed in its
window. Each may optionally be preceded by a (positive or
negative) number, whose interpretation will depend on the
particular keystroke.
q Quits the program. Control-C and control-D will do
this, too.
n Moves to the next page (or to the nth next page if a
number is given). Synonyms are `f', Space, Return, and
Line Feed.
p Moves to the previous page (or back n pages). Synonyms
are `b', control-H, and Delete.
g Moves to the page with the given number. Initially,
the first page is assumed to be page number 1, but this
can be changed with the `P' keystroke, below. If no
page number is given, then it goes to the last page.
P ``This is page number n.'' This can be used to make
the `g' keystroke refer to actual page numbers instead
of absolute page numbers.
Control-L
Redisplays the current page.
^ Move to the ``home'' position of the page. This is
normally the upper left-hand corner of the page,
depending on the margins as described in the -margins
option, above.
u Moves up a window-full.
d Moves down a window-full.
l Moves left a window-full.
r Moves right a window-full.
c Moves the page so that the point currently beneath the
cursor is moved to the middle of the window. It also
(gasp!) warps the cursor to the same place.
M Sets the margins so that the point currently under the
cursor is the upper left-hand corner of the text in the
page.
s Changes the shrink factor to the given number. If no
number is given, the smallest factor that makes the en-
tire page fit in the window will be used. (Margins are
S Sets the density factor to be used when shrinking bit-
maps. This should be a number between 0 and 100;
higher numbers produce lighter characters.
R Forces the dvi file to be reread. This allows you to
preview many versions of the same file while running
xdvi only once.
MOUSE ACTIONS
If the shrink factor is set to any number other than one,
then clicking any mouse button will pop up a ``magnifying
glass'' which shows the unshrunk image in the vicinity of
the mouse click. This subwindow disappears when the mouse
button is released. Different mouse buttons produce dif-
ferent sized windows, as indicated by the -mgs option,
above.
Also, the scrollbars (if present) behave in the standard
way: pushing Button 2 in a scrollbar moves the top or left
edge of the scrollbar to that point; pushing Button 1 moves
the image up or right by an amount equal to the distance
from the button press to the upper left-hand corner of the
window; pushing Button 3 moves the image down or left by the
same amount.
ENVIRONMENT
Uses the environment variable ``DISPLAY'' to specify which
bit map display terminal to use.
The environment variable ``TEXPKS'' determines the path(s)
searched for fonts in the following manner. The string con-
sists of one or more strings separated by colons. In each
such string, the substring ``%f'' is changed to the font
name; ``%d'' is changed to the magnification; and ``%p'' is
changed to the font family (``gf'', ``pk'', or ``pxl''). If
no ``%f'' appears in the string, then the string
``/%f.%d%p'' is added on the end. For example, if the
string is ``/usr/local/tex/fonts'' and the font is cmr10 at
300dpi, then it searches for
/usr/local/tex/fonts/cmr10.300gf,
/usr/local/tex/fonts/cmr10.300pk, and
/usr/local/tex/fonts/cmr10.1500pxl, in that order. If the
first character of the ``TEXPKS'' variable is a colon, then
the system default paths are tried first.
FILES
/usr/local/lib/tex/fonts/pk Font pixel files.
AUTHORS
Eric Cooper, CMU, did a version for direct output to a QVSS.
Modified for X by Bob Scheifler, MIT Laboratory for Computer
Science. Modified for X11 by Mark Eichin, MIT SIPB. Addi-
tional enhancements by many others.
