edit_points.h

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/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 2014-2017 CERN
 * Copyright (C) 2020-2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Maciej Suminski <maciej.suminski@cern.ch>
 *
 * 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 EDIT_POINTS_H_
#define EDIT_POINTS_H_

#include <eda_item.h>
#include <layer_ids.h>

#include <list>
#include <deque>
#include <memory>

#include "edit_constraints.h"
#include <view/view.h>


class EDIT_POINT
{
public:
    EDIT_POINT( const VECTOR2I& aPoint, std::pair<EDA_ITEM*, int> aConnected = { nullptr, 0 } ) :
            m_position( aPoint ),
            m_isActive( false ),
            m_isHover( false ),
            m_gridConstraint( SNAP_TO_GRID ),
            m_connected( aConnected )
    {
    }

    virtual ~EDIT_POINT() {}

    virtual VECTOR2I GetPosition() const
    {
        return m_position;
    }

    virtual std::pair<EDA_ITEM*, int> GetConnected() const
    {
        return m_connected;
    }

    inline int GetX() const
    {
        return GetPosition().x;
    }

    inline int GetY() const
    {
        return GetPosition().y;
    }

    virtual void SetPosition( const VECTOR2I& aPosition )
    {
        m_position = aPosition;
    }

    virtual void SetPosition( int x, int y )
    {
        m_position.x = x;
        m_position.y = y;
    }

    bool WithinPoint( const VECTOR2I& aPoint, unsigned int aSize ) const;

    void SetConstraint( EDIT_CONSTRAINT<EDIT_POINT>* aConstraint )
    {
        m_constraint.reset( aConstraint );
    }

    EDIT_CONSTRAINT<EDIT_POINT>* GetConstraint() const
    {
        return m_constraint.get();
    }

    inline void ClearConstraint()
    {
        m_constraint.reset();
    }

    inline bool IsConstrained() const
    {
        return m_constraint != nullptr;
    }

    virtual void ApplyConstraint()
    {
        if( m_constraint )
            m_constraint->Apply();
    }

    bool IsActive() const { return m_isActive; }
    void SetActive( bool aActive = true ) { m_isActive = aActive; }

    bool IsHover() const { return m_isHover; }
    void SetHover( bool aHover = true ) { m_isHover = aHover; }

    GRID_CONSTRAINT_TYPE GetGridConstraint() const { return m_gridConstraint; }
    void SetGridConstraint( GRID_CONSTRAINT_TYPE aConstraint ) { m_gridConstraint = aConstraint; }

    bool operator==( const EDIT_POINT& aOther ) const
    {
        return m_position == aOther.m_position;
    }

    static const int POINT_SIZE = 8;

    static const int BORDER_SIZE = 2;

    static const int HOVER_SIZE = 5;

private:
    VECTOR2I             m_position;        
    bool                 m_isActive;        
    bool                 m_isHover;         
    GRID_CONSTRAINT_TYPE m_gridConstraint;  

    std::pair<EDA_ITEM*, int>                     m_connected;

    std::shared_ptr<EDIT_CONSTRAINT<EDIT_POINT> > m_constraint;
};


class EDIT_LINE : public EDIT_POINT
{
public:
    EDIT_LINE( EDIT_POINT& aOrigin, EDIT_POINT& aEnd ) :
        EDIT_POINT( aOrigin.GetPosition() + ( aEnd.GetPosition() - aOrigin.GetPosition() ) / 2 ),
        m_origin( aOrigin ),
        m_end( aEnd )
    {
        SetGridConstraint( SNAP_BY_GRID );
    }

    virtual VECTOR2I GetPosition() const override
    {
        return ( m_origin.GetPosition() + m_end.GetPosition() ) / 2;
    }

    virtual void SetPosition( const VECTOR2I& aPosition ) override
    {
        VECTOR2I difference = aPosition - GetPosition();

        m_origin.SetPosition( m_origin.GetPosition() + difference );
        m_end.SetPosition( m_end.GetPosition() + difference );
    }

    virtual void ApplyConstraint() override
    {
        if( m_constraint )
            m_constraint->Apply();

        m_origin.ApplyConstraint();
        m_end.ApplyConstraint();
    }

    void SetConstraint( EDIT_CONSTRAINT<EDIT_LINE>* aConstraint )
    {
        m_constraint.reset( aConstraint );
    }

    EDIT_CONSTRAINT<EDIT_LINE>* GetConstraint() const
    {
        return m_constraint.get();
    }

    EDIT_POINT& GetOrigin()
    {
        return m_origin;
    }

    const EDIT_POINT& GetOrigin() const
    {
        return m_origin;
    }

    EDIT_POINT& GetEnd()
    {
        return m_end;
    }

    const EDIT_POINT& GetEnd() const
    {
        return m_end;
    }

    bool operator==( const EDIT_POINT& aOther ) const
    {
        return GetPosition() == aOther.GetPosition();
    }

    bool operator==( const EDIT_LINE& aOther ) const
    {
        return m_origin == aOther.m_origin && m_end == aOther.m_end;
    }

private:
    EDIT_POINT& m_origin;           
    EDIT_POINT& m_end;              

    std::shared_ptr<EDIT_CONSTRAINT<EDIT_LINE> > m_constraint;
};


class EDIT_POINTS : public EDA_ITEM
{
public:
    EDIT_POINTS( EDA_ITEM* aParent );

    EDIT_POINT* FindPoint( const VECTOR2I& aLocation, KIGFX::VIEW *aView );

    EDA_ITEM* GetParent() const
    {
        return m_parent;
    }

    void AddPoint( const EDIT_POINT& aPoint )
    {
        m_points.push_back( aPoint );
    }

    void AddPoint( const VECTOR2I& aPoint, std::pair<EDA_ITEM*, int> aConnected = { nullptr, 0 } )
    {
        AddPoint( EDIT_POINT( aPoint, aConnected ) );
    }

    void AddLine( const EDIT_LINE& aLine )
    {
        m_lines.push_back( aLine );
    }

    void AddLine( EDIT_POINT& aOrigin, EDIT_POINT& aEnd )
    {
        m_lines.emplace_back( aOrigin, aEnd );
    }

    void AddBreak()
    {
        assert( m_points.size() > 0 );
        m_contours.push_back( m_points.size() - 1 );
    }

    int GetContourStartIdx( int aPointIdx ) const;

    int GetContourEndIdx( int aPointIdx ) const;

    bool IsContourStart( int aPointIdx ) const;

    bool IsContourEnd( int aPointIdx ) const;

    EDIT_POINT* Previous( const EDIT_POINT& aPoint, bool aTraverseContours = true );

    EDIT_LINE* Previous( const EDIT_LINE& aLine );

    EDIT_POINT* Next( const EDIT_POINT& aPoint, bool aTraverseContours = true );

    EDIT_LINE* Next( const EDIT_LINE& aLine );

    EDIT_POINT& Point( unsigned int aIndex )
    {
        return m_points[aIndex];
    }

    const EDIT_POINT& Point( unsigned int aIndex ) const
    {
        return m_points[aIndex];
    }

    EDIT_LINE& Line( unsigned int aIndex )
    {
        return m_lines[aIndex];
    }

    const EDIT_LINE& Line( unsigned int aIndex ) const
    {
        return m_lines[aIndex];
    }

    unsigned int PointsSize() const
    {
        return m_points.size();
    }

    unsigned int LinesSize() const
    {
        return m_lines.size();
    }

    virtual const BOX2I ViewBBox() const override;

    virtual void ViewDraw( int aLayer, KIGFX::VIEW* aView ) const override;

    virtual void ViewGetLayers( int aLayers[], int& aCount ) const override
    {
        aCount = 1;
        aLayers[0] = LAYER_GP_OVERLAY ;
    }

#if defined(DEBUG)
    void Show( int x, std::ostream& st ) const override
    {
    }
#endif

    virtual wxString GetClass() const override
    {
        return wxT( "EDIT_POINTS" );
    }

private:
    EDA_ITEM* m_parent;                 
    std::deque<EDIT_POINT> m_points;    
    std::deque<EDIT_LINE> m_lines;      
    std::list<int> m_contours;          
    bool m_allowPoints;                 
};

#endif /* EDIT_POINTS_H_ */