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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 <reece@his.com>
* Copyright The 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_
/**
* A class to perform either relative or absolute display origin
* transforms for a single axis of a point.
*
* The coordinate argument is transformed between an offset from
* the internal origin and an offset from the user-specified origin
* and coordinate direction.
*
* The functions are templated to allow use with any size scalar
* parameter: an int, a long long int, or a double.
*/
class ORIGIN_TRANSFORMS
{
public:
/**
* The supported Display Origin Transform types
*
* Absolute coordinates require both translation and direction
* inversion. Relative coordinates require only direction inversion.
*/
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
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