man pages section 1: User Commands

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Updated: July 2014

xgc (1)


xgc - X graphics demo


xgc [-toolkitoption ...]


User Commands                                              XGC(1)

     xgc - X graphics demo

     xgc [-toolkitoption ...]

     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 consec-
     utive 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 overlap-
     ping 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

X Version 11          Last change: xgc 1.0.4                    1

User Commands                                              XGC(1)

     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 Fill-
     Style 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.

     Xgc  accepts  all  of  the  standard  X Toolkit command line

     This program accepts the usual defaults for toolkit applica-

     DISPLAY to get the default host and display number.

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


     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 pro-
     grams use anymore.

     Dan Schmidt, MIT

X Version 11          Last change: xgc 1.0.4                    2

User Commands                                              XGC(1)

     See  attributes(5)  for  descriptions   of   the   following

     |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
     |Availability                 |x11/demo                     |
     |Interface Stability          |Uncommitted                  |

X Version 11          Last change: xgc 1.0.4                    3