multistep_geom_manager.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * 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/>.
 */
 
#ifndef PREVIEW_ITEMS_MULTISTEP_GEOMETRY_MANAGER_H
#define PREVIEW_ITEMS_MULTISTEP_GEOMETRY_MANAGER_H
 
#include <math/vector2d.h>
#include <algorithm>
#include <core/kicad_algo.h>
 
namespace KIGFX {
namespace PREVIEW {

class MULTISTEP_GEOM_MANAGER
{
public:
    virtual ~MULTISTEP_GEOM_MANAGER()
    {}

    void AddPoint( const VECTOR2I& aPt, bool aLockIn )
    {
        // hold onto the raw point separately to the managed geometry
        m_lastPoint = aPt;
 
        // update the geometry
        bool accepted = acceptPoint( aPt );
 
        // advance or regress the manager
        if( aLockIn )
            performStep( accepted );
 
        setGeometryChanged();
    }

    void RemoveLastPoint()
    {
        performStep( false );
 
        // process the last point again, but in the previous step mode it doesn't matter if
        // accepted or not, as long as the geometry is regenerated if needed.
        acceptPoint( GetLastPoint() );
        setGeometryChanged();
    }

    bool IsReset() const
    {
        return m_step == 0;
    }

    virtual void Reset()
    {
        m_step = 0;
        m_lastPoint = VECTOR2I();
        setGeometryChanged();
    }

    bool IsComplete() const
    {
        return m_step == getMaxStep();
    }

    VECTOR2I GetLastPoint() const
    {
        return m_lastPoint;
    }

    bool HasGeometryChanged() const
    {
        return m_changed;
    }

    void ClearGeometryChanged()
    {
        m_changed = false;
    }
 
protected:

    void setGeometryChanged()
    {
        m_changed = true;
    }

    int getStep() const
    {
        return m_step;
    }
 
private:

    virtual bool acceptPoint( const VECTOR2I& aPt ) = 0;

    virtual int getMaxStep() const = 0;

    void performStep( bool aForward )
    {
        m_step += aForward ? 1 : -1;
 
        // clamp to allowed values
        m_step = std::clamp( m_step, 0, getMaxStep() );
    }

    bool m_changed = false;

    VECTOR2I m_lastPoint;

    int m_step = 0;
};
 
}       // PREVIEW
}       // KIGFX
 
#endif  // PREVIEW_ITEMS_MULTIPOINT_GEOMETRY_MANAGER_H