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NAME
     xgc - X graphics demo

SYNOPSIS
     xgc [ -toolkitoption ]

DESCRIPTION
     The xgc program  demonstrates  various  features  of  the  X
     graphics  primitives.   In  X, most of the details about the
     graphics to be generated are stored in a resource  called  a
     graphics  context  (GC).   The  xgc  program provides a user
     interface for setting various GC components.   Pressing  the
     "Run"  button  causes  these  results to be displayed in the
     large drawing window on the right.   Timing  information  is
     displayed in the window immediately below.

     The items in the upper left hand window work as follows:

     Function - specify the logical function  with  which  primi-
     tives  will  drawn.   The  most usual setting is "set", i.e.
     simply to render pixels without  regard  to  what  has  been
     drawn before.

     LineStyle - specify whether lines should be drawn  solid  in
     foreground,  dashed  in foreground or alternating foreground
     and background.

     CapStyle - specify the appearance of the ends of a line.

     JoinStyle - specify the appearance of  joints  between  con-
     secutive lines drawn within a single graphics primitive.

     solid, tiled with a pixmap or stippled.

     rule means that if areas overlap an  odd  number  of  times,
     they  are  not  drawn.   Winding rule means that overlapping
     areas are always filled, regardless of how many  times  they
     overlap.

     ArcMode - specifies the rule for filling of arcs.  The boun-
     dary of the arc is either a Chord or two radii.

     planemask - specifies which planes of the drawing window are
     modified.  By default, all planes are modified.

     dashlist - specifies a  pattern  to  be  used  when  drawing
     dashed lines.

     Line Width - specifies the width in pixels of  lines  to  be
     drawn.   Zero means to draw using the server's fastest algo-
     rithm with a line width of one pixel.

     Font - specifies the font to be used for text primitives.

     Foreground and Background - specify the pixel values  to  be
     applied  when  drawing  primitives.  The Foreground value is
     used as the pixel value for set bits in the  source  in  all
     primitives.  The Background value is used as the pixel value
     for unset bits in the source when using Copy Plane,  drawing
     lines   with   LineStyle  of  DoubleDash  and  filling  with
     FillStyle of OpaqueStippled.

     Percentage of Test - scrollbar  permits  specifying  only  a
     percentage  of  the  test to be run.  The number at the left
     indicates the current setting, which defaults to 100%.

     The window labeled "Test" permits choice of one a number  of
     graphics primitive tests, including Points, Segments, Lines,
     Arcs and Filled Arcs, 8-bit Text and Image Text,  Rectangles
     and  Filled  Rectangles,  Image draws, as well as Copy Plane
     and Copy Area.

     The window to the right of this  has  buttons  which  permit
     record/playback of the primitives rendered.

OPTIONS
     Xgc accepts all of  the  standard  X  Toolkit  command  line
     options.

X DEFAULTS
     This program accepts the usual defaults for toolkit applica-
     tions.

ENVIRONMENT
     DISPLAY to get the default host and display number.

     XENVIRONMENT
             to get the name of a resource  file  that  overrides
             the  global resources stored in the RESOURCE_MANAGER
             property.

SEE ALSO
     X11(7),
     O'Reilly Xlib Programming Manual, Volume I, Chapter 5

BUGS
     This program isn't really finished yet.  In particular, but-
     tons  whose  labels  appear in parentheses indicate features
     which are not yet implemented.

COPYRIGHT
     Copyright 1989, Massachusetts Institute of Technology.


AUTHORS
     Dan Schmidt, MIT

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