1SPIRO(3)                   Library Functions Manual                   SPIRO(3)
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NAME

6       libspiro - A clothoid to bezier spline converter
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SYNOPSIS

9       #include <spiroentrypoints.h> and then compile and link with -lspiro
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DESCRIPTION

12       Spiro  library  for  curve design which simplifies drawing of beautiful
13       curves.
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15       libspiro takes an array of spiro control points which can be easier for
16       an  artist  to create and modify, and then converts these into a series
17       of bezier splines which can then be used in  the  myriad  of  ways  the
18       world has come to use beziers.
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20       spiroentrypoints.h  has  technical  information  on how to connect with
21       libspiro and further information and  example  code  can  be  found  at
22       http://github.com/fontforge/libspiro
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REPORTING PROBLEMS

25       Before  reporting a problem, please check the libspiro web site to ver‐
26       ify that you have the latest version of libspiro
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28       Great care was taken to maintain backwards compatibility so it is  rec‐
29       ommended  to  upgrade  if you experience problems with earlier libspiro
30       versions.
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LIBSPIRO LICENSE

33       libspiro originated from spiro code (in 2007) found in ppedit which  is
34       a  pattern plate editor for Spiro splines.  ppedit was/is Copyright (C)
35       2007 Raph Levien. GNU GPL version 2 or higher.  ppedit was later  reli‐
36       censed  also  as Apache-2 MIT code in May of 2019.  This relicensing is
37       fine since all ppedit was written by Raph Levien in 2007. Copyright al‐
38       lows  for  this.  Unfortunately, this re-licensing of ppedit has caused
39       some confusion in assuming that this relicensing also applies  to  lib‐
40       spiro which is not valid and does not apply.
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42       libspiro  was  based on ppedit spiro code from 2007 (which was GNU GPL2
43       version 2 or higher) and built into a  usable  library  at  http://lib‐
44       spiro.sourceforge.net/ Copyright (C) 2007 George Williams. GNU GPL ver‐
45       sion 2 or higher.  This license also applies to the included Java files
46       which  have  been  forked  into javascript and typeset files seen else‐
47       where.
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49       libspiro was later picked up in 2013 and continued with further  devel‐
50       opment and improvements at http://github.com/fontforge/libspiro
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52       libspiro is now Copyright (C) 2013... as GNU GPL version 3 or higher.
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AUTHORS

55       Please see AUTHORS file for everyone involved in creating and improving
56       this libspiro
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58       Further details (on why and what) can also be seen in  git  history  as
59       well as the Changelog and README files.
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63                                  2022-Jul-22                         SPIRO(3)
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