XGC(1)                      General Commands Manual                     XGC(1)



NAME
       xgc - X graphics demo

SYNOPSIS
       xgc [-toolkitoption ...]

DESCRIPTION
       The  xgc program demonstrates various features of the X graphics primi-
       tives.  In X, most of the details about the graphics  to  be  generated
       are  stored in a resource called a graphics context (GC).  The xgc pro-
       gram 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 primitives 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 consecutive  lines
       drawn within a single graphics primitive.

       FillStyle  -  specify  whether lines, text and fill requests are solid,
       tiled with a pixmap or stippled.

       FillRule - specifies the rule used to fill polygons.  The EvenOdd  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 boundary 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 algorithm 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 set-
       ting, 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/play-
       back 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 applications.

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
       X(7)

BUGS
       This  program isn't really finished yet, but it probably never will be,
       since it only demonstrates the original  X11  core  protocol  rendering
       operations, which few modern programs use anymore.

AUTHORS
       Dan Schmidt, MIT



X Version 11                       xgc 1.0.4                            XGC(1)
