cpml/cpml-pair.h

   1 /* CPML - Cairo Path Manipulation Library
   2  * Copyright (C) 2008,2009,2010  Nicola Fontana <ntd at entidi.it>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20
  21 #if !defined(__CPML_H__)
  22 #error "Only <cpml/cpml.h> can be included directly."
  23 #endif
  24
  25
  26 #ifndef __CPML_PAIR_H__
  27 #define __CPML_PAIR_H__
  28
  29
  30 CAIRO_BEGIN_DECLS
  31
  32 typedef struct _CpmlPair CpmlPair;
  33 typedef struct _CpmlPair CpmlVector;
  34
  35 struct _CpmlPair {
  36     double  x, y;
  37 };
  38
  39
  40 void            cpml_pair_from_cairo            (CpmlPair       *pair,
  41                                                  const cairo_path_data_t
  42                                                                 *path_data);
  43 void            cpml_pair_copy                  (CpmlPair       *pair,
  44                                                  const CpmlPair *src);
  45 void            cpml_pair_transform             (CpmlPair       *pair,
  46                                                  const cairo_matrix_t
  47                                                                 *matrix);
  48 double          cpml_pair_squared_distance      (const CpmlPair *from,
  49                                                  const CpmlPair *to);
  50 double          cpml_pair_distance              (const CpmlPair *from,
  51                                                  const CpmlPair *to);
  52 void            cpml_pair_to_cairo              (const CpmlPair *pair,
  53                                                  cairo_path_data_t
  54                                                                 *path_data);
  55
  56 void            cpml_vector_from_angle          (CpmlVector     *vector,
  57                                                  double          angle);
  58 void            cpml_vector_set_length          (CpmlVector     *vector,
  59                                                  double          length);
  60 double          cpml_vector_angle               (const CpmlVector
  61                                                                 *vector);
  62 void            cpml_vector_normal              (CpmlVector     *vector);
  63 void            cpml_vector_transform           (CpmlVector     *vector,
  64                                                  const cairo_matrix_t
  65                                                                 *matrix);
  66
  67 CAIRO_END_DECLS
  68
  69
  70 #endif /* __CPML_PAIR_H__ */