x11                package:grDevices                R Documentation

X Window System Graphics

Description:

     'X11' starts a graphics device driver for the X Window System
     (version 11).  This can only be done on machines that run X. 'x11'
     is recognized as a synonym for 'X11'.

Usage:

     X11(display = "", width = 7, height = 7, pointsize = 12,
         gamma = getOption("gamma"), colortype = getOption("X11colortype"),
         maxcubesize = 256, bg = "transparent", canvas = "white",
         fonts = getOption("X11fonts"), xpos = NA, ypos = NA)

Arguments:

 display: the display on which the graphics window will appear. The
          default is to use the value in the user's environment
          variable 'DISPLAY'.

width, height: the width and height of the plotting window, in inches. 
          See also Resources.

pointsize: the default pointsize to be used.

   gamma: the gamma correction factor.  This value is used to ensure
          that the colors perceived are linearly related to RGB values
          (see 'hsv').  By default this is taken from
          'options("gamma")', or is 1 (no correction) if that is unset
          (which is the usual case). 

colortype: the kind of color model to be used.  The possibilities are
          '"mono"', '"gray"', '"pseudo"', '"pseudo.cube"' and '"true"'.
           Ignored if an 'X11' device is already open.

maxcubesize: can be used to limit the size of color cube allocated for
          pseudocolor devices.

      bg: color.  The default background color.

  canvas: color.  The color of the canvas, which is visible only when
          the background color is transparent.

   fonts: X11 font description strings into which weight, slant and
          size will be substituted.  There are two, the first for fonts
          1 to 4 and the second for font 5, the symbol font. See
          section Fonts.

xpos, ypos: initial position of the top left corner of the window, in
          pixels.  Negative values are from the opposite corner, e.g.
          'xpos=-100' says the top right corner should be 100 pixels
          from the right edge of the screen. If 'NA', successive
          devices are cascaded in 20 pixel steps from the top left. 
          See also Resources.

Details:

     By default, an X11 device will use the best color rendering
     strategy that it can.  The choice can be overridden with the
     'colortype' parameter.  A value of '"mono"' results in black and
     white graphics, '"gray"' in grayscale and '"true"' in truecolor
     graphics (if this is possible).  The values '"pseudo"' and
     '"pseudo.cube"' provide color strategies for pseudocolor displays.
      The first strategy provides on-demand color allocation which
     produces exact colors until the color resources of the display are
     exhausted.  The second causes a standard color cube to be set up,
     and requested colors are approximated by the closest value in the
     cube.  The default strategy for pseudocolor displays is
     '"pseudo"'.

     *Note:* All 'X11' devices share a 'colortype' which is set by the
     first device to be opened.  To change the 'colortype' you need to
     close _all_ open 'X11' devices then open one with the desired
     'colortype'.

     With 'colortype' equal to '"pseudo.cube"' or '"gray"' successively
     smaller palettes are tried until one is completely allocated. If
     allocation of the smallest attempt fails the device will revert to
     '"mono"'.

     Line widths as controlled by 'par(lwd=)' are in multiples of the
     pixel size, and multiples < 1 are silently converted to 1.

     'pch="."' with 'cex = 1' corresponds to a rectangle of sides the
     larger of one pixel and 0.01 inch.

     The initial size and position are only hints, and may not be acted
     on by the window manager.

Fonts:

     An initial/default font family for the device can be specified via
     the 'fonts' argument, but if a device-independent R graphics font
     family is specified (e.g., via 'par(family=)' in the graphics
     package), the X11 device makes use of the X11 font database (see
     'X11Fonts') to convert the R graphics font family to an
     X11-specific font family description.

     X11 chooses fonts by matching to a pattern, and it is quite
     possible that it will choose a font in the wrong encoding or which
     does not contain glyphs for your language (particularly common in
     'iso10646-1' fonts).

     The 'fonts' argument is a two-element character vector, and the
     first element will be crucial in successfully using
     non-Western-European fonts.  Settings that have proved useful
     include

     '"-*-mincho-%s-%s-*-*-%d-*-*-*-*-*-*-*"' for CJK languages and
     '"-cronyx-helvetica-%s-%s-*-*-%d-*-*-*-*-*-*-*"' for Russian.

     For UTF-8 locales, the 'XLC_LOCALE' databases provide mappings
     between character encodings, and you may need to add an entry for
     your locale (e.g. Fedora Core 3 lacked one for 'ru_RU.utf8').

Resources:

     The standard X11 resource 'geometry' can be used to specify the
     window position and/or size, but will be overridden by values
     specified as arguments.  The class looked for is 'R_x11'.  Note
     that the resource specifies the width and height in pixels and not
     in inches.  See for example <URL:
     http://web.mit.edu/answers/xwindows/xwindows_resources.html> and
     perhaps 'man X' (or <URL:
     http://www.xfree86.org/current/X.7.html>). An example line in
     '~/.Xresources' might be

     R_x11*geometry: 900x900-0+0

     that specifies a 900 x 900 pixel window at the top right of the
     screen.

See Also:

     'Devices', 'X11Fonts'.

