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/* Pango
* pango-matrix.h: Matrix manipulation routines
*
* Copyright (C) 2002, 2006 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __PANGO_MATRIX_H__
#define __PANGO_MATRIX_H__
#include <glib.h>
#include <glib-object.h>
G_BEGIN_DECLS
typedef struct _PangoMatrix PangoMatrix;
/**
* PangoMatrix:
* @xx: 1st component of the transformation matrix
* @xy: 2nd component of the transformation matrix
* @yx: 3rd component of the transformation matrix
* @yy: 4th component of the transformation matrix
* @x0: x translation
* @y0: y translation
*
* A structure specifying a transformation between user-space
* coordinates and device coordinates. The transformation
* is given by
*
* <programlisting>
* x_device = x_user * matrix->xx + y_user * matrix->xy + matrix->x0;
* y_device = x_user * matrix->yx + y_user * matrix->yy + matrix->y0;
* </programlisting>
*
* Since: 1.6
**/
struct _PangoMatrix
{
double xx;
double xy;
double yx;
double yy;
double x0;
double y0;
};
/**
* PANGO_TYPE_MATRIX:
*
* The GObject type for #PangoMatrix
**/
#define PANGO_TYPE_MATRIX (pango_matrix_get_type ())
/**
* PANGO_MATRIX_INIT:
*
* Constant that can be used to initialize a PangoMatrix to
* the identity transform.
*
* <informalexample><programlisting>
* PangoMatrix matrix = PANGO_MATRIX_INIT;
* pango_matrix_rotate (&matrix, 45.);
* </programlisting></informalexample>
*
* Since: 1.6
**/
#define PANGO_MATRIX_INIT { 1., 0., 0., 1., 0., 0. }
/* for PangoRectangle */
#include <pango/pango-types.h>
GType pango_matrix_get_type (void) G_GNUC_CONST;
PangoMatrix *pango_matrix_copy (const PangoMatrix *matrix);
void pango_matrix_free (PangoMatrix *matrix);
void pango_matrix_translate (PangoMatrix *matrix,
double tx,
double ty);
void pango_matrix_scale (PangoMatrix *matrix,
double scale_x,
double scale_y);
void pango_matrix_rotate (PangoMatrix *matrix,
double degrees);
void pango_matrix_concat (PangoMatrix *matrix,
const PangoMatrix *new_matrix);
void pango_matrix_transform_point (const PangoMatrix *matrix,
double *x,
double *y);
void pango_matrix_transform_distance (const PangoMatrix *matrix,
double *dx,
double *dy);
void pango_matrix_transform_rectangle (const PangoMatrix *matrix,
PangoRectangle *rect);
void pango_matrix_transform_pixel_rectangle (const PangoMatrix *matrix,
PangoRectangle *rect);
double pango_matrix_get_font_scale_factor (const PangoMatrix *matrix) G_GNUC_PURE;
G_END_DECLS
#endif /* __PANGO_MATRIX_H__ */
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