origin_transforms.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019-2020 Reece R. Pollack <[email protected]>
 * Copyright (C) 1992-2019 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
 */

#ifndef ORIGIN_TRANSFORMS_H_
#define ORIGIN_TRANSFORMS_H_

class ORIGIN_TRANSFORMS
{
public:
 enum COORD_TYPES_T {
 NOT_A_COORD, //< A non-coordinate value, never transformed
 ABS_X_COORD, //< An absolute X coordinate
 ABS_Y_COORD, //< An absolute Y coordinate
 REL_X_COORD, //< A relative X coordinate
 REL_Y_COORD, //< A relative Y coordinate
 };

 ORIGIN_TRANSFORMS();

 virtual ~ORIGIN_TRANSFORMS();

 virtual int ToDisplay( int aValue,
 COORD_TYPES_T aCoordType ) const;

 virtual long long int ToDisplay( long long int aValue,
 COORD_TYPES_T aCoordType ) const;

 virtual double ToDisplay( double aValue,
 COORD_TYPES_T aCoordType ) const;

 virtual int FromDisplay( int aValue,
 COORD_TYPES_T aCoordType ) const;

 virtual long long int FromDisplay( long long int aValue,
 COORD_TYPES_T aCoordType ) const;

 virtual double FromDisplay( double aValue,
 COORD_TYPES_T aCoordType ) const;


 template<class T>
 T ToDisplayAbs( const T& aValue ) const
 {
 T displayValue;

 displayValue.x = ToDisplay( aValue.x, ABS_X_COORD );
 displayValue.y = ToDisplay( aValue.y, ABS_Y_COORD );
 return displayValue;
 }

 template<class T>
 T ToDisplayRel( const T& aValue ) const
 {
 T displayValue;

 displayValue.x = ToDisplay( aValue.x, REL_X_COORD );
 displayValue.y = ToDisplay( aValue.y, REL_Y_COORD );
 return displayValue;
 }


 template<class T>
 T FromDisplayAbs( const T& aValue ) const
 {
 T displayValue;

 displayValue.x = FromDisplay( aValue.x, ABS_X_COORD );
 displayValue.y = FromDisplay( aValue.y, ABS_Y_COORD );
 return displayValue;
 }

 template<class T>
 T FromDisplayRel( const T& aValue ) const
 {
 T displayValue;

 displayValue.x = FromDisplay( aValue.x, REL_X_COORD );
 displayValue.y = FromDisplay( aValue.y, REL_Y_COORD );
 return displayValue;
 }


protected:
 template<class T> inline static
 T ToDisplayRel( T aInternalValue,
 bool aInvertAxis )
 {
 T displayValue = aInternalValue;

 // Invert the direction if needed
 if( aInvertAxis && (displayValue != static_cast<T>(0)) )
 displayValue = -displayValue;

 return displayValue;
 }


 template<class T> inline static
 T FromDisplayRel( T aDisplayValue,
 bool aInvertAxis )
 {
 T internalValue = aDisplayValue;

 // Invert the direction if needed
 if( aInvertAxis && (internalValue != static_cast<T>(0)) )
 internalValue = -internalValue;

 return internalValue;
 }

 template<class T> inline static
 T ToDisplayAbs( T aInternalValue,
 int aUserOrigin,
 bool aInvertAxis )
 {
 T displayValue = aInternalValue;

 // Make the value relative to the internal origin
 displayValue -= aUserOrigin;

 // Invert the direction if needed
 if( aInvertAxis && (displayValue != static_cast<T>(0)) )
 displayValue = -displayValue;

 return displayValue;
 }

 template<class T> inline static
 T FromDisplayAbs( T aDisplayValue,
 int aUserOrigin,
 bool aInvertAxis )
 {
 T internalValue = aDisplayValue;

 // Invert the direction if needed
 if( aInvertAxis && (internalValue != static_cast<T>(0)) )
 internalValue = -internalValue;

 // Make the value relative to the internal origin
 internalValue += aUserOrigin;

 return internalValue;
 }
};

#endif // ORIGIN_TRANSFORMS_H