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1 README file for xearth, version 1.1
2 Kirk Lauritz Johnson <email@example.com>
3 6 November 1999
6 WHAT IS IT?
8 Xearth sets the X root window to an image of the Earth, as seen
9 from your favorite vantage point in space, correctly shaded for
10 the current position of the Sun. By default, xearth updates the
11 displayed image every five minutes; the time between updates can
12 be changed using either X resources or a command line
13 option. Xearth can also be configured to render into a top-level X
14 window or directly into PPM and GIF files; see the man page for
17 See the HISTORY file for a list of changes since earlier versions
18 of xearth.
21 WHERE TO GET IT?
23 The latest-and-greatest version of xearth should always be
24 available via a link from the xearth WWW home page (URL
25 http://www.cs.colorado.edu/~tuna/xearth/index.html), or, for the
26 web-deprived, via anonymous ftp from cag.lcs.mit.edu in /pub/tuna.
31 If you are trying to build xearth under SunOS 4.x using /bin/cc,
32 make sure to read the section of the INSTALL file entitled
33 "BUILDING UNDER SUNOS 4.x" regarding a compiler bug.
35 The map information used in xearth was derived from the "CIA World
36 Data Bank II map database," as taken from some "cbd" files that
37 were apparently originally generated by Brian Reid at DEC WRL.
39 Running in the background on 350 MHz Pentium II, xearth requires
40 less than one CPU second each time it redraws an image in the root
41 window. With the default time-between-redraws of 300 seconds, I
42 simply don't notice the extra CPU load. Your mileage may vary, of
43 course, especially on slower machines.
45 The Graphics Interchange Format(c) is the Copyright property of
46 CompuServe Incorporated. GIF(sm) is a Service Mark property of
47 CompuServe Incorporated.
49 Thanks to Robert Berger for allowing me to include his nifty Gamma
50 Measurement Image and associated text in the xearth source
53 Thanks to Jamie Zawinski for suggesting that I look at his
54 xscreensaver package for a good example of how to use the resource
55 and command line option parts of Xt; his code saved me piles of
58 Thanks to Chris Metcalf for the -bigstars stuff, a pile of general
59 source code cleaning, and spell checking everything carefully.
61 Thanks to Chris Hayward, Chris Metcalf, Sherman Mui, Dan Rich, and
62 Leonard Zubkoff for giving the pre-release of version 1.0 a test
65 Kudos to Jef Poskanzer for his excellent PBMPLUS toolkit.
67 Finally, thanks to everybody that sent encouragement, suggestions,
68 and patches. Apologies to the many people whose good ideas didn't
69 make it into this release.
72 IDEAS FOR FUTURE WORK
74 Better error recovery (better than "assert()", anyway).
76 Add options/resources that specify colors other than the default
77 green, blue, red, white, and black.
79 Code for tracking real-life orbits ("-pos hubble").
81 Support for supersampling/antialiasing.
86 Kirk Johnson <firstname.lastname@example.org>
88 Patches, bug reports, and suggestions are welcome, although I
89 can't guarantee that I'll get around to doing anything about them
90 in a timely fashion.
93 LEGAL STUFF
95 Copyright (C) 1989, 1990, 1993-1995, 1999 Kirk Lauritz Johnson
97 Parts of the source code (as marked) are:
98 Copyright (C) 1989, 1990, 1991 by Jim Frost
99 Copyright (C) 1992 by Jamie Zawinski <email@example.com>
101 Permission to use, copy, modify and freely distribute xearth for
102 non-commercial and not-for-profit purposes is hereby granted
103 without fee, provided that both the above copyright notice and
104 this permission notice appear in all copies and in supporting
107 Unisys Corporation holds worldwide patent rights on the Lempel Zev
108 Welch (LZW) compression technique employed in the CompuServe GIF
109 image file format as well as in other formats. Unisys has made it
110 clear, however, that it does not require licensing or fees to be
111 paid for freely distributed, non-commercial applications (such as
112 xearth) that employ LZW/GIF technology. Those wishing further
113 information about licensing the LZW patent should contact Unisys
114 directly at (firstname.lastname@example.org) or by writing to
116 Unisys Corporation
117 Welch Licensing Department
119 P.O. Box 500
120 Blue Bell, PA 19424
122 The author makes no representations about the suitability of this
123 software for any purpose. It is provided "as is" without express
124 or implied warranty.
126 THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
127 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
128 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT
129 OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
130 LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
131 NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
132 CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.