mirror of https://github.com/GNOME/gimp.git
282 lines
8.1 KiB
C
282 lines
8.1 KiB
C
/* GIMP - The GNU Image Manipulation Program
|
|
* Copyright (C) 1995-2001 Spencer Kimball, Peter Mattis, and others
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <glib-object.h>
|
|
|
|
#include "libgimpmath/gimpmath.h"
|
|
|
|
#include "core-types.h"
|
|
|
|
#include "gimp-transform-utils.h"
|
|
|
|
|
|
void
|
|
gimp_transform_matrix_flip (GimpMatrix3 *matrix,
|
|
GimpOrientationType flip_type,
|
|
gdouble axis)
|
|
{
|
|
g_return_if_fail (matrix != NULL);
|
|
|
|
switch (flip_type)
|
|
{
|
|
case GIMP_ORIENTATION_HORIZONTAL:
|
|
gimp_matrix3_translate (matrix, - axis, 0.0);
|
|
gimp_matrix3_scale (matrix, -1.0, 1.0);
|
|
gimp_matrix3_translate (matrix, axis, 0.0);
|
|
break;
|
|
|
|
case GIMP_ORIENTATION_VERTICAL:
|
|
gimp_matrix3_translate (matrix, 0.0, - axis);
|
|
gimp_matrix3_scale (matrix, 1.0, -1.0);
|
|
gimp_matrix3_translate (matrix, 0.0, axis);
|
|
break;
|
|
|
|
case GIMP_ORIENTATION_UNKNOWN:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
gimp_transform_matrix_flip_free (GimpMatrix3 *matrix,
|
|
gdouble x1,
|
|
gdouble y1,
|
|
gdouble x2,
|
|
gdouble y2)
|
|
{
|
|
gdouble angle;
|
|
|
|
g_return_if_fail (matrix != NULL);
|
|
|
|
angle = atan2 (y2 - y1, x2 - x1);
|
|
|
|
gimp_matrix3_identity (matrix);
|
|
gimp_matrix3_translate (matrix, -x1, -y1);
|
|
gimp_matrix3_rotate (matrix, -angle);
|
|
gimp_matrix3_scale (matrix, 1.0, -1.0);
|
|
gimp_matrix3_rotate (matrix, angle);
|
|
gimp_matrix3_translate (matrix, x1, y1);
|
|
}
|
|
|
|
void
|
|
gimp_transform_matrix_rotate (GimpMatrix3 *matrix,
|
|
GimpRotationType rotate_type,
|
|
gdouble center_x,
|
|
gdouble center_y)
|
|
{
|
|
gdouble angle = 0;
|
|
|
|
switch (rotate_type)
|
|
{
|
|
case GIMP_ROTATE_90:
|
|
angle = G_PI_2;
|
|
break;
|
|
case GIMP_ROTATE_180:
|
|
angle = G_PI;
|
|
break;
|
|
case GIMP_ROTATE_270:
|
|
angle = - G_PI_2;
|
|
break;
|
|
}
|
|
|
|
gimp_transform_matrix_rotate_center (matrix, center_x, center_y, angle);
|
|
}
|
|
|
|
void
|
|
gimp_transform_matrix_rotate_rect (GimpMatrix3 *matrix,
|
|
gint x,
|
|
gint y,
|
|
gint width,
|
|
gint height,
|
|
gdouble angle)
|
|
{
|
|
gdouble center_x;
|
|
gdouble center_y;
|
|
|
|
g_return_if_fail (matrix != NULL);
|
|
|
|
center_x = (gdouble) x + (gdouble) width / 2.0;
|
|
center_y = (gdouble) y + (gdouble) height / 2.0;
|
|
|
|
gimp_matrix3_translate (matrix, -center_x, -center_y);
|
|
gimp_matrix3_rotate (matrix, angle);
|
|
gimp_matrix3_translate (matrix, +center_x, +center_y);
|
|
}
|
|
|
|
void
|
|
gimp_transform_matrix_rotate_center (GimpMatrix3 *matrix,
|
|
gdouble center_x,
|
|
gdouble center_y,
|
|
gdouble angle)
|
|
{
|
|
g_return_if_fail (matrix != NULL);
|
|
|
|
gimp_matrix3_translate (matrix, -center_x, -center_y);
|
|
gimp_matrix3_rotate (matrix, angle);
|
|
gimp_matrix3_translate (matrix, +center_x, +center_y);
|
|
}
|
|
|
|
void
|
|
gimp_transform_matrix_scale (GimpMatrix3 *matrix,
|
|
gint x,
|
|
gint y,
|
|
gint width,
|
|
gint height,
|
|
gdouble t_x,
|
|
gdouble t_y,
|
|
gdouble t_width,
|
|
gdouble t_height)
|
|
{
|
|
gdouble scale_x = 1.0;
|
|
gdouble scale_y = 1.0;
|
|
|
|
g_return_if_fail (matrix != NULL);
|
|
|
|
if (width > 0)
|
|
scale_x = t_width / (gdouble) width;
|
|
|
|
if (height > 0)
|
|
scale_y = t_height / (gdouble) height;
|
|
|
|
gimp_matrix3_identity (matrix);
|
|
gimp_matrix3_translate (matrix, -x, -y);
|
|
gimp_matrix3_scale (matrix, scale_x, scale_y);
|
|
gimp_matrix3_translate (matrix, t_x, t_y);
|
|
}
|
|
|
|
void
|
|
gimp_transform_matrix_shear (GimpMatrix3 *matrix,
|
|
gint x,
|
|
gint y,
|
|
gint width,
|
|
gint height,
|
|
GimpOrientationType orientation,
|
|
gdouble amount)
|
|
{
|
|
gdouble center_x;
|
|
gdouble center_y;
|
|
|
|
g_return_if_fail (matrix != NULL);
|
|
|
|
if (width == 0)
|
|
width = 1;
|
|
|
|
if (height == 0)
|
|
height = 1;
|
|
|
|
center_x = (gdouble) x + (gdouble) width / 2.0;
|
|
center_y = (gdouble) y + (gdouble) height / 2.0;
|
|
|
|
gimp_matrix3_identity (matrix);
|
|
gimp_matrix3_translate (matrix, -center_x, -center_y);
|
|
|
|
if (orientation == GIMP_ORIENTATION_HORIZONTAL)
|
|
gimp_matrix3_xshear (matrix, amount / height);
|
|
else
|
|
gimp_matrix3_yshear (matrix, amount / width);
|
|
|
|
gimp_matrix3_translate (matrix, +center_x, +center_y);
|
|
}
|
|
|
|
void
|
|
gimp_transform_matrix_perspective (GimpMatrix3 *matrix,
|
|
gint x,
|
|
gint y,
|
|
gint width,
|
|
gint height,
|
|
gdouble t_x1,
|
|
gdouble t_y1,
|
|
gdouble t_x2,
|
|
gdouble t_y2,
|
|
gdouble t_x3,
|
|
gdouble t_y3,
|
|
gdouble t_x4,
|
|
gdouble t_y4)
|
|
{
|
|
GimpMatrix3 trafo;
|
|
gdouble scalex;
|
|
gdouble scaley;
|
|
|
|
g_return_if_fail (matrix != NULL);
|
|
|
|
scalex = scaley = 1.0;
|
|
|
|
if (width > 0)
|
|
scalex = 1.0 / (gdouble) width;
|
|
|
|
if (height > 0)
|
|
scaley = 1.0 / (gdouble) height;
|
|
|
|
gimp_matrix3_translate (matrix, -x, -y);
|
|
gimp_matrix3_scale (matrix, scalex, scaley);
|
|
|
|
/* Determine the perspective transform that maps from
|
|
* the unit cube to the transformed coordinates
|
|
*/
|
|
{
|
|
gdouble dx1, dx2, dx3, dy1, dy2, dy3;
|
|
|
|
dx1 = t_x2 - t_x4;
|
|
dx2 = t_x3 - t_x4;
|
|
dx3 = t_x1 - t_x2 + t_x4 - t_x3;
|
|
|
|
dy1 = t_y2 - t_y4;
|
|
dy2 = t_y3 - t_y4;
|
|
dy3 = t_y1 - t_y2 + t_y4 - t_y3;
|
|
|
|
/* Is the mapping affine? */
|
|
if ((dx3 == 0.0) && (dy3 == 0.0))
|
|
{
|
|
trafo.coeff[0][0] = t_x2 - t_x1;
|
|
trafo.coeff[0][1] = t_x4 - t_x2;
|
|
trafo.coeff[0][2] = t_x1;
|
|
trafo.coeff[1][0] = t_y2 - t_y1;
|
|
trafo.coeff[1][1] = t_y4 - t_y2;
|
|
trafo.coeff[1][2] = t_y1;
|
|
trafo.coeff[2][0] = 0.0;
|
|
trafo.coeff[2][1] = 0.0;
|
|
}
|
|
else
|
|
{
|
|
gdouble det1, det2;
|
|
|
|
det1 = dx3 * dy2 - dy3 * dx2;
|
|
det2 = dx1 * dy2 - dy1 * dx2;
|
|
|
|
trafo.coeff[2][0] = (det2 == 0.0) ? 1.0 : det1 / det2;
|
|
|
|
det1 = dx1 * dy3 - dy1 * dx3;
|
|
|
|
trafo.coeff[2][1] = (det2 == 0.0) ? 1.0 : det1 / det2;
|
|
|
|
trafo.coeff[0][0] = t_x2 - t_x1 + trafo.coeff[2][0] * t_x2;
|
|
trafo.coeff[0][1] = t_x3 - t_x1 + trafo.coeff[2][1] * t_x3;
|
|
trafo.coeff[0][2] = t_x1;
|
|
|
|
trafo.coeff[1][0] = t_y2 - t_y1 + trafo.coeff[2][0] * t_y2;
|
|
trafo.coeff[1][1] = t_y3 - t_y1 + trafo.coeff[2][1] * t_y3;
|
|
trafo.coeff[1][2] = t_y1;
|
|
}
|
|
|
|
trafo.coeff[2][2] = 1.0;
|
|
}
|
|
|
|
gimp_matrix3_mult (&trafo, matrix);
|
|
}
|