transform.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2010 Wayne Stambaugh <[email protected]>
 * Copyright (C) 2015-2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include <hash.h>
#include <trigo.h>
#include <transform.h>
#include <math/util.h> // for KiROUND
#include <math/box2.h>
 
// a transform matrix, to display symbols in lib editor
TRANSFORM DefaultTransform = TRANSFORM( 1, 0, 0, -1 );
 
 
bool TRANSFORM::operator==( const TRANSFORM& aTransform ) const
{
 return ( x1 == aTransform.x1 &&
 y1 == aTransform.y1 &&
 x2 == aTransform.x2 &&
 y2 == aTransform.y2 );
}
 
 
VECTOR2I TRANSFORM::TransformCoordinate( const VECTOR2I& aPoint ) const
{
 return VECTOR2I( ( x1 * aPoint.x ) + ( y1 * aPoint.y ), ( x2 * aPoint.x ) + ( y2 * aPoint.y ) );
}
 
 
BOX2I TRANSFORM::TransformCoordinate( const BOX2I& aRect ) const
{
 BOX2I rect;
 rect.SetOrigin( TransformCoordinate( aRect.GetOrigin() ) );
 rect.SetEnd( TransformCoordinate( aRect.GetEnd() ) );
 return rect;
}
 
 
TRANSFORM TRANSFORM::InverseTransform() const
{
 int invx1;
 int invx2;
 int invy1;
 int invy2;
 
 /* Calculates the inverse matrix coeffs:
 * for a matrix m{x1, x2, y1, y2}
 * the inverse matrix is 1/(x1*y2 -x2*y1) m{y2,-x2,-y1,x1)
 */
 int det = x1*y2 -x2*y1; // Is never null, because the inverse matrix exists
 invx1 = y2/det;
 invx2 = -x2/det;
 invy1 = -y1/det;
 invy2 = x1/det;
 
 TRANSFORM invtransform( invx1, invy1, invx2, invy2 );
 return invtransform;
}
 
 
bool TRANSFORM::MapAngles( EDA_ANGLE* aAngle1, EDA_ANGLE* aAngle2 ) const
{
 static const EDA_ANGLE epsilon( 0.1, DEGREES_T );
 
 wxCHECK_MSG( aAngle1 != nullptr && aAngle2 != nullptr, false,
 wxT( "Cannot map NULL point angles." ) );
 
 double x, y;
 VECTOR2D v;
 bool swap = false;
 
 EDA_ANGLE delta = *aAngle2 - *aAngle1;
 
 x = aAngle1->Cos();
 y = aAngle1->Sin();
 v = VECTOR2D( x * x1 + y * y1, x * x2 + y * y2 );
 *aAngle1 = EDA_ANGLE( v );
 
 x = aAngle2->Cos();
 y = aAngle2->Sin();
 v = VECTOR2D( x * x1 + y * y1, x * x2 + y * y2 );
 *aAngle2 = EDA_ANGLE( v );
 
 EDA_ANGLE deltaTransformed = *aAngle2 - *aAngle1;
 EDA_ANGLE residualError( deltaTransformed - delta );
 residualError.Normalize();
 
 if( residualError > epsilon || residualError < epsilon.Invert().Normalize() )
 {
 std::swap( *aAngle1, *aAngle2 );
 swap = true;
 }
 
 if( *aAngle2 < *aAngle1 )
 {
 if( *aAngle2 < ANGLE_0 )
 aAngle2->Normalize();
 else
 *aAngle1 = aAngle1->Normalize() - ANGLE_360;
 }
 
 return swap;
}
 
 
size_t std::hash<TRANSFORM>::operator()( const TRANSFORM& s ) const
{
 size_t seed = std::hash<int>{}( s.x1 );
 hash_combine( seed, s.y1, s.x2, s.y2 );
 return seed;
}