Simon Tatham 64e114cce1 draw_polygon() and draw_circle() have always had a portability
constraint: because some front ends interpret `draw filled shape' to
mean `including its boundary' while others interpret it to mean `not
including its boundary' (and X seems to vacillate between the two
opinions as it moves around the shape!), you MUST NOT draw a filled
shape only. You can fill in one colour and outline in another, you
can fill or outline in the same colour, or you can just outline, but
just filling is a no-no.

This leads to a _lot_ of double calls to these functions, so I've
changed the interface. draw_circle() and draw_polygon() now each
take two colour arguments, a fill colour (which can be -1 for none)
and an outline colour (which must be valid). This should simplify
code in the game back ends, while also reducing the possibility for
coding error.

[originally from svn r6047]
2005-07-03 09:35:29 +00:00

This is the README accompanying the source code to Simon Tatham's
puzzle collection. The collection's web site is at
<http://www.chiark.greenend.org.uk/~sgtatham/puzzles/>.

You should find several Makefiles in the source code:

 - `Makefile' should work under GNU make on Linux, provided you have
   GTK installed to compile and link against. It builds GTK binaries
   of the puzzle games.

 - `Makefile.vc' should work under MS Visual C++ on Windows.

 - `Makefile.cyg' should work under Cygwin / MinGW. With appropriate
   tweaks and setting of TOOLPATH, it should work for both compiling
   on Windows and cross-compiling on Unix.

 - `Makefile.osx' should work under Mac OS X, provided the Xcode
   tools are installed. It builds a single monolithic OS X
   application capable of running any of the puzzles, or even more
   than one of them at a time.

Many of these Makefiles build a program called `nullgame' in
addition to the actual game binaries. This program doesn't do
anything; it's just a template for people to start from when adding
a new game to the collection, and it's compiled every time to ensure
that it _does_ compile and link successfully (because otherwise it
wouldn't be much use as a template). Once it's built, you can run it
if you really want to (but it's very boring), and then you should
ignore it.

DO NOT EDIT THE MAKEFILES DIRECTLY, if you plan to send any changes
back to the maintainer. The makefiles are generated automatically by
the Perl script `mkfiles.pl' from the file `Recipe'. If you need to
change the makefiles as part of a patch, you should change Recipe
and/or mkfiles.pl.

The manual is provided in Windows Help format for the Windows build;
in text format for anyone who needs it; and in HTML for the Mac OS X
application and for the web site. It is generated from a Halibut
source file (puzzles.but), which is the preferred form for
modification. To generate the manual in other formats, rebuild it,
or learn about Halibut, visit the Halibut website at
<http://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
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