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 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_
 
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