XGC(1) User Commands XGC(1)

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 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
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 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 1.0.6 XGC(1)