xgc
(1)
Name
xgc - X graphics demo
Synopsis
xgc [-toolkitoption ...]
Description
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 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
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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.
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
X(5)
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 pro-
grams use anymore.
AUTHORS
Dan Schmidt, MIT
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User Commands XGC(1)
ATTRIBUTES
See attributes(5) for descriptions of the following
attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |x11/demo |
+-----------------------------+-----------------------------+
|Interface Stability |Uncommitted |
+-----------------------------+-----------------------------+
X Version 11 Last change: xgc 1.0.4 3