/* === S Y N F I G ========================================================= */
/*! \file synfig/rendering/primitive/affinetransformation.cpp
** \brief AffineTransformation
**
** $Id$
**
** \legal
** ......... ... 2015-2018 Ivan Mahonin
**
** This package 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 package 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.
** \endlegal
*/
/* ========================================================================= */
/* === H E A D E R S ======================================================= */
#ifdef USING_PCH
# include "pch.h"
#else
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifndef _WIN32
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#endif
#include "transformationaffine.h"
#endif
using namespace synfig;
using namespace rendering;
/* === M A C R O S ========================================================= */
/* === G L O B A L S ======================================================= */
/* === P R O C E D U R E S ================================================= */
/* === M E T H O D S ======================================================= */
Transformation::Handle
TransformationAffine::create_inverted_vfunc() const
{ return new TransformationAffine(Matrix(matrix).invert()); }
Point
TransformationAffine::transform_vfunc(const Point &x, bool translate) const
{ return matrix.get_transformed(x, translate); }
Transformation::Bounds
TransformationAffine::transform_bounds_vfunc(const Bounds &bounds) const
{
if (!bounds.is_valid())
return Bounds();
// calculate bounds rect
Vector corners[] = {
matrix.get_transformed( bounds.rect.get_min() ),
matrix.get_transformed( Vector(bounds.rect.minx, bounds.rect.maxy) ),
matrix.get_transformed( Vector(bounds.rect.maxx, bounds.rect.miny) ),
matrix.get_transformed( bounds.rect.get_max() ) };
Rect rect = Rect( corners[0] )
.expand( corners[1] )
.expand( corners[2] )
.expand( corners[3] );
// calculate units per "pixel"
Real upp_x0 = fabs(corners[1][0] - corners[0][0]) / (bounds.resolution[0] * bounds.rect.get_width());
Real upp_x1 = fabs(corners[2][0] - corners[0][0]) / (bounds.resolution[1] * bounds.rect.get_height());
Real upp_y0 = fabs(corners[1][1] - corners[0][1]) / (bounds.resolution[0] * bounds.rect.get_width());
Real upp_y1 = fabs(corners[2][1] - corners[0][1]) / (bounds.resolution[1] * bounds.rect.get_height());
Vector upp(
std::max(upp_x0, upp_x1),
std::max(upp_y0, upp_y1) );
if ( approximate_less_or_equal(upp[0], Real(0.0))
&& approximate_less_or_equal(upp[1], Real(0.0)) )
return Bounds();
return Bounds(rect, Vector(1.0/upp[0], 1.0/upp[1]));
}
/* === E N T R Y P O I N T ================================================= */