transform.cpp

Go to the documentation of this file.

/*
 * 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 <macros.h>
#include <trigo.h>
#include <transform.h>
#include <common.h>
#include <eda_rect.h>
#include <math/util.h> // for KiROUND


bool TRANSFORM::operator==( const TRANSFORM& aTransform ) const
{
 return ( x1 == aTransform.x1 &&
 y1 == aTransform.y1 &&
 x2 == aTransform.x2 &&
 y2 == aTransform.y2 );
}


wxPoint TRANSFORM::TransformCoordinate( const wxPoint& aPoint ) const
{
 return wxPoint( ( x1 * aPoint.x ) + ( y1 * aPoint.y ),
 ( x2 * aPoint.x ) + ( y2 * aPoint.y ) );
}

EDA_RECT TRANSFORM::TransformCoordinate( const EDA_RECT& aRect ) const
{
 EDA_RECT 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( int* aAngle1, int* aAngle2 ) const
{
 wxCHECK_MSG( aAngle1 != nullptr && aAngle2 != nullptr, false,
 wxT( "Cannot map NULL point angles." ) );

 int Angle, Delta;
 double x, y, t;
 bool swap = false;

 Delta = *aAngle2 - *aAngle1;

 if( Delta >= 1800 )
 {
 *aAngle1 -= 1;
 *aAngle2 += 1;
 }

 x = cos( DECIDEG2RAD( *aAngle1 ) );
 y = sin( DECIDEG2RAD( *aAngle1 ) );
 t = x * x1 + y * y1;
 y = x * x2 + y * y2;
 x = t;
 *aAngle1 = KiROUND( RAD2DECIDEG( atan2( y, x ) ) );

 x = cos( DECIDEG2RAD( *aAngle2 ) );
 y = sin( DECIDEG2RAD( *aAngle2 ) );
 t = x * x1 + y * y1;
 y = x * x2 + y * y2;
 x = t;
 *aAngle2 = KiROUND( RAD2DECIDEG( atan2( y, x ) ) );

 NORMALIZE_ANGLE_POS( *aAngle1 );
 NORMALIZE_ANGLE_POS( *aAngle2 );

 if( *aAngle2 < *aAngle1 )
 *aAngle2 += 3600;

 if( *aAngle2 - *aAngle1 > 1800 ) // Need to swap the two angles
 {
 Angle = (*aAngle1);
 *aAngle1 = (*aAngle2);
 *aAngle2 = Angle;

 NORMALIZE_ANGLE_POS( *aAngle1 );
 NORMALIZE_ANGLE_POS( *aAngle2 );

 if( *aAngle2 < *aAngle1 )
 *aAngle2 += 3600;

 swap = true;
 }

 if( Delta >= 1800 )
 {
 *aAngle1 += 1;
 *aAngle2 -= 1;
 }

 return swap;
}