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, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
class EDA_ANGLE;

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() = default;
 
    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 double ToDisplay( const EDA_ANGLE& 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;
    virtual EDA_ANGLE FromDisplay( const EDA_ANGLE& 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;
    }
};