159 lines
6.1 KiB
Groff
159 lines
6.1 KiB
Groff
.\" Copyright (c) 1991 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included
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.\" in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.\" Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software is furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice (including the next
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.\" paragraph) shall be included in all copies or substantial portions of the
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.\" Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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.\" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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.\" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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.\" DEALINGS IN THE SOFTWARE.
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.\"
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.TH XGC 1 __xorgversion__
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.SH NAME
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xgc - X graphics demo
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.SH SYNOPSIS
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.ta 8n
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\fBxgc\fP [-\fItoolkitoption\fP ...]
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.SH DESCRIPTION
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The
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.I xgc
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program demonstrates various features of the X graphics primitives.
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In X, most of the details about the graphics to be generated are
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stored in a resource called a graphics context (GC). The
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.B xgc
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program provides a user interface for setting various GC components.
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Pressing the "Run" button causes these results to be displayed in
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the large drawing window on the right. Timing information is
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displayed in the window immediately below.
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.PP
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The items in the upper left hand window work as follows:
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.PP
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.I Function
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\- specify the logical function with which primitives
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will drawn. The most usual setting is "set", i.e. simply to render
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pixels without regard to what has been drawn before.
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.PP
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.I LineStyle
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\- specify whether lines should be drawn solid in foreground,
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dashed in foreground or alternating foreground and background.
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.PP
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.I CapStyle
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\- specify the appearance of the ends of a line.
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.PP
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.I JoinStyle
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\- specify the appearance of joints between consecutive
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lines drawn within a single graphics primitive.
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.PP
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.I FillStyle
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\- specify whether lines, text and fill requests are
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solid, tiled with a pixmap or stippled.
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.PP
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.I FillRule
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\- specifies the rule used to fill polygons. The EvenOdd
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rule means that if areas overlap an odd number of times, they are not
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drawn. Winding rule means that overlapping areas are always filled,
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regardless of how many times they overlap.
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.PP
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.I ArcMode
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\- specifies the rule for filling of arcs. The boundary
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of the arc is either a Chord or two radii.
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.PP
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.I planemask
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\- specifies which planes of the drawing window are
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modified. By default, all planes are modified.
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.PP
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.I dashlist
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\- specifies a pattern to be used when drawing dashed lines.
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.PP
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.I Line Width
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\- specifies the width in pixels of lines to be drawn.
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Zero means to draw using the server's fastest algorithm with a line width of
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one pixel.
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.PP
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.I Font
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\- specifies the font to be used for text primitives.
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.PP
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.I Foreground
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and
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.I Background
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\- specify the pixel values to be
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applied when drawing primitives.
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The Foreground value is used as the
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pixel value for set bits in the source in all primitives.
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The Background value is used as the
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pixel value for unset bits in the source when using Copy Plane, drawing
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lines with LineStyle of DoubleDash and filling with FillStyle of
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OpaqueStippled.
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.PP
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.I Percentage of Test
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\- scrollbar permits specifying only
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a percentage of the test to be run. The number at the left indicates
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the current setting, which defaults to 100%.
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.sp
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The window labeled "Test" permits choice of one a number of graphics
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primitive tests, including Points, Segments, Lines, Arcs and Filled Arcs,
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8-bit Text and Image Text, Rectangles and Filled Rectangles, Image draws,
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as well as Copy Plane and Copy Area.
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.PP
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The window to the right of this has buttons which permit record/playback
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of the primitives rendered.
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.SH OPTIONS
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.I Xgc
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accepts all of the standard X Toolkit command line options.
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.SH X DEFAULTS
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This program accepts the usual defaults for toolkit applications.
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.SH ENVIRONMENT
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.PP
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.TP 8
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.B DISPLAY
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to get the default host and display number.
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.TP 8
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.B XENVIRONMENT
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to get the name of a resource file that overrides the global resources
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stored in the RESOURCE_MANAGER property.
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.SH "SEE ALSO"
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X(__miscmansuffix__)
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.SH BUGS
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This program isn't really finished yet, but it probably never will be,
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since it only demonstrates the original X11 core protocol rendering
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operations, which few modern programs use anymore.
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.SH AUTHORS
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Dan Schmidt, MIT
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