grid_helper.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2021 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 GRID_HELPER_H
#define GRID_HELPER_H

#include <tool/tool_manager.h>
#include <vector>
#include <math/vector2d.h>
#include <origin_viewitem.h>

class TOOL_MANAGER;
class EDA_ITEM;


class GRID_HELPER
{
public:
 GRID_HELPER( TOOL_MANAGER* aToolMgr );
 virtual ~GRID_HELPER();

 VECTOR2I GetGrid() const;
 VECTOR2I GetOrigin() const;

 void SetAuxAxes( bool aEnable, const VECTOR2I& aOrigin = VECTOR2I( 0, 0 ) );

 virtual VECTOR2I Align( const VECTOR2I& aPoint ) const;

 VECTOR2I AlignGrid( const VECTOR2I& aPoint ) const;

 void SetSkipPoint( const VECTOR2I& aPoint )
 {
 m_skipPoint = aPoint;
 }

 void ClearSkipPoint()
 {
 m_skipPoint = VECTOR2I( std::numeric_limits<int>::min(), std::numeric_limits<int>::min() );
 }

 void SetSnap( bool aSnap ) { m_enableSnap = aSnap; }
 bool GetSnap() const { return m_enableSnap; }

 void SetUseGrid( bool aSnapToGrid ) { m_enableGrid = aSnapToGrid; }
 bool GetUseGrid() const { return m_enableGrid; }

 void SetSnapLine( bool aSnap ) { m_enableSnapLine = aSnap; }

 void SetMask( int aMask ) { m_maskTypes = aMask; }
 void SetMaskFlag( int aFlag ) { m_maskTypes |= aFlag; }
 void ClearMaskFlag( int aFlag ) { m_maskTypes = m_maskTypes & ~aFlag; }

 enum ANCHOR_FLAGS {
 CORNER = 1,
 OUTLINE = 2,
 SNAPPABLE = 4,
 ORIGIN = 8,
 VERTICAL = 16,
 HORIZONTAL = 32,
 ALL = CORNER | OUTLINE | SNAPPABLE | ORIGIN | VERTICAL | HORIZONTAL
 };

protected:

 struct ANCHOR
 {
 ANCHOR( const VECTOR2I& aPos, int aFlags = CORNER | SNAPPABLE, EDA_ITEM* aItem = nullptr ) :
 pos( aPos ),
 flags( aFlags ),
 item( aItem )
 { };

 VECTOR2I pos;
 int flags;
 EDA_ITEM* item;

 double Distance( const VECTOR2I& aP ) const
 {
 return ( aP - pos ).EuclideanNorm();
 }
 };

 void addAnchor( const VECTOR2I& aPos, int aFlags, EDA_ITEM* aItem )
 {
 if( ( aFlags & m_maskTypes ) == aFlags )
 m_anchors.emplace_back( ANCHOR( aPos, aFlags, aItem ) );
 }

 void clearAnchors()
 {
 m_anchors.clear();
 }

 bool canUseGrid() const
 {
 return m_enableGrid && m_toolMgr->GetView()->GetGAL()->GetGridSnapping();
 }

protected:
 std::vector<ANCHOR> m_anchors;

 TOOL_MANAGER* m_toolMgr;
 OPT<VECTOR2I> m_auxAxis;

 int m_maskTypes; // Mask of allowed snap types

 bool m_enableSnap; // Allow snapping to other items on the layers
 bool m_enableGrid; // If true, allow snapping to grid
 bool m_enableSnapLine; // Allow drawing lines from snap points
 ANCHOR* m_snapItem; // Pointer to the currently snapped item in m_anchors
 // (NULL if not snapped)
 VECTOR2I m_skipPoint; // When drawing a line, we avoid snapping to the source
 // point
 KIGFX::ORIGIN_VIEWITEM m_viewSnapPoint;
 KIGFX::ORIGIN_VIEWITEM m_viewSnapLine;
 KIGFX::ORIGIN_VIEWITEM m_viewAxis;
};

#endif