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https://github.com/fontforge/libspiro

Spiro is the creation of Raph Levien. It simplifies the drawing of beautiful curves. (Migrated here from libspiro.sourceforge.net on 2013-04-20)
https://github.com/fontforge/libspiro

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Spiro is the creation of Raph Levien. It simplifies the drawing of beautiful curves. (Migrated here from libspiro.sourceforge.net on 2013-04-20)

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README 

        
LibSpiro is a shared library designed to give programs the ability to create

smooth continuous curves based on a given set of codes and X,Y constraints.



The main user(s) for Libspiro are Font editing programs such as FontForge,

and graphical drawing programs such as GEGL, IPE (as well as an early fork

used in InkScape). This library has strong potential in graphic and vector

programs where users want beautiful curves translated into beziers curves.



Developers interested in sharing and making use of LibSpiro will likely want

to read (these README files too to understand how to use LibSpiro better):

README-RaphLevien (ppedit 20070504)

README-GeorgeWilliams (libspiro 20071029)



There is a large amount of information and math on RaphLevien's website for

developers interested in how LibSpiro works.



Developers interested in example programs, can take a look at spiro.c found

in FontForge, InkScape, or linking examples like GEGL, IPE or call-test.c

(call-test.c is included with development files with this library).



Maintainers

===========



Developers interested in maintaining libspiro will need to fetch the latest

config.guess and config.sub to ensure that libspiro will run on as many

configurations as possible. Then update configure.ac to the next revision,

and run 'make check', 'make dist', and 'make distcheck' to ensure all works.

See git patch 'LibSpiro 20200505 - Version 1.1.0' for example patching.

Configurable releases is based on first removing all non relevant files to

reduce final tar file before running 'make dist', such as all hidden files

and directories. The resulting file created by 'make dist' is then usually

with -dist- in the filename so that distros that follow the release page

are able to fetch the latest libspiro using their scripts. Example:

libspiro-20200505.tar.gz is renamed as libspiro-dist-20200505.tar.gz



Installation

============



Installing from Git master requires 2 preparatory steps:



First, you need to create the `configure' script if you do not have it yet.

This will require autoreconf and automake to build `configure'.

> autoreconf -i

> automake --foreign -Wall



Second, you then use the usual steps to compile it.

Various operating systems and setups will need `configure' options set.

The INSTALLATION file has detailed info for `configure' options.

Example install steps for Linux, FreeBSD, Win32/64 are shown below:



Installing on Linux

> ./configure

> make

> make check

> sudo make install



Installing on FreeBSD10 (using clang3.3 or 3.6)

> ./configure --prefix=$(pwd)/BUILD

> make clean

> make

> make install



Installing on Windows 32-bit

> ./configure --host=i686-w64-mingw32 --prefix=$(pwd)/build-w32

> make clean

> make

> make install



Installing on Windows 64-bit

> ./configure --host=x86_64-w64-mingw32 --prefix=$(pwd)/build-w64

> make clean

> make

> make install



NOTE: Some Distros and Operating Systems may require you to run 'ldconfig'

to recognize LibSpiro if you are not rebooting your computer first before

installing another program that depends on LibSpiro. To do this, you may

need to run 'ldconfig' in 'su -' mode after you have done 'make install':



	$ su -

	# ldconfig

	# exit

	$