xmag(X)                         19 June 1992                         xmag(X)


 Name

    xmag - magnify parts of the screen

 Syntax

    xmag [option ...]

 Description

    The xmag program allows you to magnify portions of the screen.  If no ex-
    plicit region is specified, a square centered around the pointer is dis-
    played 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 the position, number, 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.

 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 enlargement
            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 magnifi-
            cation to compute the default enlargement window size.  There-
            fore, 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 fac-
            tor is given with this option.

    -bw pixels
            This option specifies the width in pixels of the border surround-
            ing the enlargement window.

    -bd color
            This option specifies the color to use for the border surrounding
            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 BlackPixel
            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 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 background
            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 also

    X(X), xwd(X)

 Bugs

    This program will behave strangely on displays that support windows of
    different depths.

    Because the window size equals the source size times the magnification,
    you only need to specify two of the three parameters.  This can be
    confusing.

    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.