xmag_multivis(6)xmag_multivis(6)NAMExmag_multivis - magnify parts of the screen
SYNOPSISxmag_multivis [ -display display ] [ -geometry geom ] [ -source geom ]
[ -mag magfactor ] [ -bw pixels ] [ -bd color ] [ -bg colorpixelvalue ]
[ -fn fontname ] [ -z ]
DESCRIPTION
The xmag_multivis program allows you to magnify portions of the screen.
If no explicit region is specified, a square centered around the
pointer is displayed indicating the area to be enlarged. Once a region
has been selected, a window is popped up showing a blown up version of
the region in which each pixel in the source image is represented by a
small square of the same color. Pressing Button1 on the pointer in the
enlargement window pops up a small window displaying, in hexadecimal
notation, the position, pixel value, and RGB value of the pixel under
the pointer until the button is released. Pressing the space bar or
any other pointer button removes the enlarged image so that another
region may be selected. Pressing ``q'', ``Q'', or ``^C'' in the
enlargement window exits the program.
On displays that export multiple Visuals, the selected region is first
examined for overlaps by windows of differing depth, visual or col‐
ormap. If the selected region does contain such windows, the image dis‐
played in the enlargement window is constructed by compositing the
images from the various windows under the selected region. In this
case, the composite image will only be displayed in a TrueColor 24 bit
deep window, provided such a window can be created on that screen. The
image displayed in the enlargement window will exhibit true colors for
every pixel in the composite image, regardless of the Colormap state
(Installed/UnInstalled) of any of the windows within the selected
region.
OPTIONS-display display
This option specifies the X server to use for both reading the
screen and displaying the enlarged version of the image.
-geometry geom
This option specifies the size and/or location of the enlarge‐
ment window. By default, the size is computed from the size of
the source region and the desired magnification. Therefore,
only one of -source size and -mag magfactor options may be
specified if a window size is given with this option.
-source geom
This option specifies the size and/or location of the source
region on the screen. By default, a 64x64 square centered
about the pointer is provided for the user to select an area of
the screen. The size of the source is used with the desired
magnification to compute the default enlargement window size.
Therefore, only one of -geometry size and -mag magfactor
options may be specified if a source size is given with this
option.
-mag magfactor
This option specifies an integral factor by which the source
region should be enlarged. The default magnification is 5.
This is used with the size of the source to compute the default
enlargement window size. Therefore, only one of -geometry size
and -source geom options may be specified if a magnification
factor is given with this option.
-bw pixels
This option specifies the width in pixels of the border sur‐
rounding the enlargement window.
-bd color
This option specifies the color to use for the border surround‐
ing the enlargement window.
-bg colororpixelvalue
This option specifies the name of the color to be used as the
background of the enlargement window. If the name begins with
a percent size (%), it is interpreted to be an absolute pixel
value. This is useful when displaying large areas since pixels
that are the same color as the background do not need to be
painted in the enlargement. The default is to use the Black‐
Pixel of the screen.
-fn fontname
This option specifies the name of a font to use when displaying
pixel values (used when Button1 is pressed in the enlargement
window).
-z This option indicates that the server should be grabbed during
the dynamics and the call to XGetImage. This is useful for
ensuring that clients don't change their state as a result of
entering or leaving them with the pointer.
X DEFAULTS
The xmag_multivis program uses the following X resources:
geometry (class Geometry)
Specifies the size and/or location of the enlargement window.
source (class Source)
Specifies the size and/or location of the source region on the
screen.
magnification (class Magnification)
Specifies the enlargement factor.
borderWidth (class BorderWidth)
Specifies the border width in pixels.
borderColor (class BorderColor)
Specifies the color of the border.
background (class Background)
Specifies the color or pixel value to be used for the back‐
ground of the enlargement window.
font (class Font)
Specifies the name of the font to use when displaying pixel
values when the user presses Button1 in the enlargement window.
SEE ALSOxwd(1), xmag(1)BUGS
On displays that export multiple visuals, if the selected region needs
to be composited from each window, xmag_multivis insists on a TrueColor
24 bit window to display the selected region, and exits with a failure
if such a window cannot be created. It would be nice, instead if
xmag_multivis would determine the best possible visual to display the
image, or instead tried to display the image in a visual selected by
the user in a command line option.
Because the window size equals the source size times the magnification,
you only need to specify two of the three parameters. This can be con‐
fusing.
Being able to drag the pointer around and see a dynamic display would
be very nice.
Another possible interface would be for the user to drag out the
desired area to be enlarged.
COPYRIGHT
Copyright 1988, Massachusetts Institute of Technology.
MultiVisual code: Copyright (c) 1990-92 by Sun Microsystems, Inc.
AUTHOR
Jim Fulton, MIT X Consortium
MultiVisual code: Milind Pansare, Sun Microsystems, Inc.
23 March 1992 xmag_multivis(6)
