cpml/cpml-pair.h

   1 /* CPML - Cairo Path Manipulation Library
   2  * Copyright (C) 2008, 2009  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 #ifndef __CPML_PAIR_H__
  21 #define __CPML_PAIR_H__
  22
  23 #include <cairo.h>
  24
  25
  26 CAIRO_BEGIN_DECLS
  27
  28 typedef struct _CpmlPair CpmlPair;
  29 typedef struct _CpmlPair CpmlVector;
  30
  31 struct _CpmlPair {
  32     double  x, y;
  33 };
  34
  35
  36 CpmlPair *      cpml_pair_copy                  (CpmlPair       *pair,
  37                                                  const CpmlPair *src);
  38 CpmlPair *      cpml_pair_from_cairo            (CpmlPair       *pair,
  39                                                  const cairo_path_data_t
  40                                                                 *path_data);
  41
  42 void            cpml_pair_negate                (CpmlPair       *pair);
  43 cairo_bool_t    cpml_pair_invert                (CpmlPair       *pair);
  44 void            cpml_pair_add                   (CpmlPair       *pair,
  45                                                  const CpmlPair *src);
  46 void            cpml_pair_sub                   (CpmlPair       *pair,
  47                                                  const CpmlPair *src);
  48 void            cpml_pair_mul                   (CpmlPair       *pair,
  49                                                  const CpmlPair *src);
  50 cairo_bool_t    cpml_pair_div                   (CpmlPair       *pair,
  51                                                  const CpmlPair *src);
  52 void            cpml_pair_transform             (CpmlPair       *pair,
  53                                                  const cairo_matrix_t
  54                                                                 *matrix);
  55 double          cpml_pair_squared_distance      (const CpmlPair *from,
  56                                                  const CpmlPair *to);
  57 double          cpml_pair_distance              (const CpmlPair *from,
  58                                                  const CpmlPair *to);
  59
  60 CpmlVector *    cpml_vector_from_angle          (CpmlVector     *vector,
  61                                                  double          angle,
  62                                                  double          length);
  63
  64 void            cpml_vector_set_length          (CpmlVector     *vector,
  65                                                  double          length);
  66 double          cpml_vector_angle               (const CpmlVector
  67                                                                 *vector);
  68 void            cpml_vector_normal              (CpmlVector     *vector);
  69 void            cpml_pair_to_cairo              (const CpmlPair *pair,
  70                                                  cairo_path_data_t
  71                                                                 *path_data);
  72
  73
  74 CAIRO_END_DECLS
  75
  76
  77 #endif /* __CPML_PAIR_H__ */