2 * pango-matrix.h: Matrix manipulation routines
4 * Copyright (C) 2002, 2006 Red Hat Software
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
22 #ifndef __PANGO_MATRIX_H__
23 #define __PANGO_MATRIX_H__
26 #include <glib-object.h>
30 typedef struct _PangoMatrix PangoMatrix;
34 * @xx: 1st component of the transformation matrix
35 * @xy: 2nd component of the transformation matrix
36 * @yx: 3rd component of the transformation matrix
37 * @yy: 4th component of the transformation matrix
41 * A structure specifying a transformation between user-space
42 * coordinates and device coordinates. The transformation
46 * x_device = x_user * matrix->xx + y_user * matrix->xy + matrix->x0;
47 * y_device = x_user * matrix->yx + y_user * matrix->yy + matrix->y0;
65 * The GObject type for #PangoMatrix
67 #define PANGO_TYPE_MATRIX (pango_matrix_get_type ())
72 * Constant that can be used to initialize a PangoMatrix to
73 * the identity transform.
75 * <informalexample><programlisting>
76 * PangoMatrix matrix = PANGO_MATRIX_INIT;
77 * pango_matrix_rotate (&matrix, 45.);
78 * </programlisting></informalexample>
82 #define PANGO_MATRIX_INIT { 1., 0., 0., 1., 0., 0. }
84 /* for PangoRectangle */
85 #include <pango/pango-types.h>
87 GType pango_matrix_get_type (void) G_GNUC_CONST;
89 PangoMatrix *pango_matrix_copy (const PangoMatrix *matrix);
90 void pango_matrix_free (PangoMatrix *matrix);
92 void pango_matrix_translate (PangoMatrix *matrix,
95 void pango_matrix_scale (PangoMatrix *matrix,
98 void pango_matrix_rotate (PangoMatrix *matrix,
100 void pango_matrix_concat (PangoMatrix *matrix,
101 const PangoMatrix *new_matrix);
102 void pango_matrix_transform_point (const PangoMatrix *matrix,
105 void pango_matrix_transform_distance (const PangoMatrix *matrix,
108 void pango_matrix_transform_rectangle (const PangoMatrix *matrix,
109 PangoRectangle *rect);
110 void pango_matrix_transform_pixel_rectangle (const PangoMatrix *matrix,
111 PangoRectangle *rect);
112 double pango_matrix_get_font_scale_factor (const PangoMatrix *matrix) G_GNUC_PURE;
117 #endif /* __PANGO_MATRIX_H__ */