kicad/libs/kimath/include/geometry/shape_poly_set.h

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2015-2019 CERN
* Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
*
* @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
* @author Alejandro García Montoro <alejandro.garciamontoro@gmail.com>
*
* 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 __SHAPE_POLY_SET_H
#define __SHAPE_POLY_SET_H
#include <cstdio>
#include <deque> // for deque
#include <vector> // for vector
#include <iosfwd> // for string, stringstream
#include <memory>
#include <set> // for set
#include <stdexcept> // for out_of_range
#include <stdlib.h> // for abs
#include <vector>
#include <clipper.hpp> // for ClipType, PolyTree (ptr only)
#include <geometry/seg.h> // for SEG
#include <geometry/shape.h>
#include <geometry/shape_line_chain.h>
#include <math/box2.h> // for BOX2I
#include <math/vector2d.h> // for VECTOR2I
#include <md5_hash.h>
/**
* Represent a set of closed polygons. Polygons may be nonconvex, self-intersecting
* and have holes. Provides boolean operations (using Clipper library as the backend).
*
* Let us define the terms used on this class to clarify methods names and comments:
* - Polygon: each polygon in the set.
* - Outline: first polyline in each polygon; represents its outer contour.
* - Hole: second and following polylines in the polygon.
* - Contour: each polyline of each polygon in the set, whether or not it is an
* outline or a hole.
* - Vertex (or corner): each one of the points that define a contour.
*
* TODO: add convex partitioning & spatial index
*/
class SHAPE_POLY_SET : public SHAPE
{
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public:
///< represents a single polygon outline with holes. The first entry is the outline,
///< the remaining (if any), are the holes
///< N.B. SWIG only supports typedef, so avoid c++ 'using' keyword
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typedef std::vector<SHAPE_LINE_CHAIN> POLYGON;
class TRIANGULATED_POLYGON
{
public:
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struct TRI : public SHAPE_LINE_CHAIN_BASE
{
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TRI( int _a = 0, int _b = 0, int _c = 0, TRIANGULATED_POLYGON* aParent = nullptr ) :
SHAPE_LINE_CHAIN_BASE( SH_POLY_SET_TRIANGLE ),
a( _a ),
b( _b ),
c( _c ),
parent( aParent )
{
}
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virtual void Rotate( double aAngle, const VECTOR2I& aCenter = { 0, 0 } ) override {};
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virtual void Move( const VECTOR2I& aVector ) override {};
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virtual bool IsSolid() const override { return true; }
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virtual bool IsClosed() const override { return true; }
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virtual const BOX2I BBox( int aClearance = 0 ) const override;
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virtual const VECTOR2I GetPoint( int aIndex ) const override
{
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switch(aIndex)
{
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case 0: return parent->m_vertices[a];
case 1: return parent->m_vertices[b];
case 2: return parent->m_vertices[c];
default: assert(false);
}
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return VECTOR2I(0, 0);
}
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virtual const SEG GetSegment( int aIndex ) const override
{
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switch(aIndex)
{
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case 0: return SEG( parent->m_vertices[a], parent->m_vertices[b] );
case 1: return SEG( parent->m_vertices[b], parent->m_vertices[c] );
case 2: return SEG( parent->m_vertices[c], parent->m_vertices[a] );
default: assert(false);
}
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return SEG();
}
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virtual size_t GetPointCount() const override { return 3; }
virtual size_t GetSegmentCount() const override { return 3; }
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int a, b, c;
TRIANGULATED_POLYGON* parent;
};
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TRIANGULATED_POLYGON();
TRIANGULATED_POLYGON( const TRIANGULATED_POLYGON& aOther );
~TRIANGULATED_POLYGON();
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void Clear()
{
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m_vertices.clear();
m_triangles.clear();
}
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void GetTriangle( int index, VECTOR2I& a, VECTOR2I& b, VECTOR2I& c ) const
{
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auto tri = m_triangles[ index ];
a = m_vertices[ tri.a ];
b = m_vertices[ tri.b ];
c = m_vertices[ tri.c ];
}
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TRIANGULATED_POLYGON& operator=( const TRIANGULATED_POLYGON& aOther );
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void AddTriangle( int a, int b, int c );
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void AddVertex( const VECTOR2I& aP )
{
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m_vertices.push_back( aP );
}
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size_t GetTriangleCount() const
{
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return m_triangles.size();
}
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std::deque<TRI>& Triangles()
{
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return m_triangles;
}
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size_t GetVertexCount() const
{
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return m_vertices.size();
}
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void Move( const VECTOR2I& aVec )
{
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for( auto& vertex : m_vertices )
vertex += aVec;
}
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private:
std::deque<TRI> m_triangles;
std::deque<VECTOR2I> m_vertices;
};
/**
* Structure to hold the necessary information in order to index a vertex on a
* SHAPE_POLY_SET object: the polygon index, the contour index relative to the polygon and
* the vertex index relative the contour.
*/
struct VERTEX_INDEX
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{
int m_polygon; /*!< m_polygon is the index of the polygon. */
int m_contour; /*!< m_contour is the index of the contour relative to the polygon. */
int m_vertex; /*!< m_vertex is the index of the vertex relative to the contour. */
VERTEX_INDEX() :
m_polygon(-1),
m_contour(-1),
m_vertex(-1)
{
}
};
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/**
* Base class for iterating over all vertices in a given SHAPE_POLY_SET.
*/
template <class T>
class ITERATOR_TEMPLATE
{
public:
/**
* @return true if the current vertex is the last one of the current contour
* (outline or hole); false otherwise.
*/
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bool IsEndContour() const
{
return m_currentVertex + 1 ==
m_poly->CPolygon( m_currentPolygon )[m_currentContour].PointCount();
}
/**
* @return true if the current outline is the last one; false otherwise.
*/
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bool IsLastPolygon() const
{
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return m_currentPolygon == m_lastPolygon;
}
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operator bool() const
{
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if( m_currentPolygon < m_lastPolygon )
return true;
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if( m_currentPolygon != m_poly->OutlineCount() - 1 )
return false;
const auto& currentPolygon = m_poly->CPolygon( m_currentPolygon );
return m_currentContour < (int) currentPolygon.size() - 1
|| m_currentVertex < currentPolygon[m_currentContour].PointCount();
}
/**
* Advance the indices of the current vertex/outline/contour, checking whether the
* vertices in the holes have to be iterated through.
*/
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void Advance()
{
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// Advance vertex index
m_currentVertex ++;
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// Check whether the user wants to iterate through the vertices of the holes
// and behave accordingly
if( m_iterateHoles )
{
// If the last vertex of the contour was reached, advance the contour index
if( m_currentVertex >=
m_poly->CPolygon( m_currentPolygon )[m_currentContour].PointCount() )
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{
m_currentVertex = 0;
m_currentContour++;
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// If the last contour of the current polygon was reached, advance the
// outline index
int totalContours = m_poly->CPolygon( m_currentPolygon ).size();
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if( m_currentContour >= totalContours )
{
m_currentContour = 0;
m_currentPolygon++;
}
}
}
else
{
// If the last vertex of the outline was reached, advance to the following polygon
if( m_currentVertex >= m_poly->CPolygon( m_currentPolygon )[0].PointCount() )
{
m_currentVertex = 0;
m_currentPolygon++;
}
}
}
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void operator++( int dummy )
{
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Advance();
}
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void operator++()
{
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Advance();
}
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const T& Get()
{
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return m_poly->Polygon( m_currentPolygon )[m_currentContour].CPoint( m_currentVertex );
}
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const T& operator*()
{
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return Get();
}
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const T* operator->()
{
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return &Get();
}
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/**
* @return the indices of the current polygon, contour and vertex.
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*/
VERTEX_INDEX GetIndex()
{
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VERTEX_INDEX index;
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index.m_polygon = m_currentPolygon;
index.m_contour = m_currentContour;
index.m_vertex = m_currentVertex;
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return index;
}
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private:
friend class SHAPE_POLY_SET;
SHAPE_POLY_SET* m_poly;
int m_currentPolygon;
int m_currentContour;
int m_currentVertex;
int m_lastPolygon;
bool m_iterateHoles;
};
/**
* Base class for iterating over all segments in a given SHAPE_POLY_SET.
*/
template <class T>
class SEGMENT_ITERATOR_TEMPLATE
{
public:
/**
* @return true if the current outline is the last one.
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*/
bool IsLastPolygon() const
{
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return m_currentPolygon == m_lastPolygon;
}
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operator bool() const
{
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return m_currentPolygon <= m_lastPolygon;
}
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/**
* Advance the indices of the current vertex/outline/contour, checking whether the
* vertices in the holes have to be iterated through.
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*/
void Advance()
{
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// Advance vertex index
m_currentSegment++;
int last;
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// Check whether the user wants to iterate through the vertices of the holes
// and behave accordingly.
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if( m_iterateHoles )
{
last = m_poly->CPolygon( m_currentPolygon )[m_currentContour].SegmentCount();
// If the last vertex of the contour was reached, advance the contour index.
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if( m_currentSegment >= last )
{
m_currentSegment = 0;
m_currentContour++;
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// If the last contour of the current polygon was reached, advance the
// outline index.
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int totalContours = m_poly->CPolygon( m_currentPolygon ).size();
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if( m_currentContour >= totalContours )
{
m_currentContour = 0;
m_currentPolygon++;
}
}
}
else
{
last = m_poly->CPolygon( m_currentPolygon )[0].SegmentCount();
// If the last vertex of the outline was reached, advance to the following
// polygon
if( m_currentSegment >= last )
{
m_currentSegment = 0;
m_currentPolygon++;
}
}
}
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void operator++( int dummy )
{
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Advance();
}
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void operator++()
{
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Advance();
}
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T Get()
{
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return m_poly->Polygon( m_currentPolygon )[m_currentContour].Segment( m_currentSegment );
}
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T operator*()
{
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return Get();
}
/**
* @return the indices of the current polygon, contour and vertex.
*/
VERTEX_INDEX GetIndex() const
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{
VERTEX_INDEX index;
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index.m_polygon = m_currentPolygon;
index.m_contour = m_currentContour;
index.m_vertex = m_currentSegment;
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return index;
}
/**
* @param aOther is an iterator pointing to another segment.
* @return true if both iterators point to the same segment of the same contour of
* the same polygon of the same polygon set; false otherwise.
*/
bool IsAdjacent( SEGMENT_ITERATOR_TEMPLATE<T> aOther ) const
{
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// Check that both iterators point to the same contour of the same polygon of the
// same polygon set.
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if( m_poly == aOther.m_poly && m_currentPolygon == aOther.m_currentPolygon &&
m_currentContour == aOther.m_currentContour )
{
// Compute the total number of segments.
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int numSeg;
numSeg = m_poly->CPolygon( m_currentPolygon )[m_currentContour].SegmentCount();
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// Compute the difference of the segment indices. If it is exactly one, they
// are adjacent. The only missing case where they also are adjacent is when
// the segments are the first and last one, in which case the difference
// always equals the total number of segments minus one.
int indexDiff = std::abs( m_currentSegment - aOther.m_currentSegment );
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return ( indexDiff == 1 ) || ( indexDiff == (numSeg - 1) );
}
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return false;
}
private:
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friend class SHAPE_POLY_SET;
SHAPE_POLY_SET* m_poly;
int m_currentPolygon;
int m_currentContour;
int m_currentSegment;
int m_lastPolygon;
bool m_iterateHoles;
};
// Iterator and const iterator types to visit polygon's points.
typedef ITERATOR_TEMPLATE<VECTOR2I> ITERATOR;
typedef ITERATOR_TEMPLATE<const VECTOR2I> CONST_ITERATOR;
// Iterator and const iterator types to visit polygon's edges.
typedef SEGMENT_ITERATOR_TEMPLATE<SEG> SEGMENT_ITERATOR;
typedef SEGMENT_ITERATOR_TEMPLATE<const SEG> CONST_SEGMENT_ITERATOR;
SHAPE_POLY_SET();
/**
* Construct a SHAPE_POLY_SET with the first outline given by aOutline.
*
* @param aOutline is a closed outline
*/
SHAPE_POLY_SET( const SHAPE_LINE_CHAIN& aOutline );
/**
* Copy constructor SHAPE_POLY_SET
* Performs a deep copy of \p aOther into \p this.
*
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* @param aOther is the SHAPE_POLY_SET object that will be copied.
*/
SHAPE_POLY_SET( const SHAPE_POLY_SET& aOther );
~SHAPE_POLY_SET();
SHAPE_POLY_SET& operator=( const SHAPE_POLY_SET& aOther );
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void CacheTriangulation( bool aPartition = true );
bool IsTriangulationUpToDate() const;
MD5_HASH GetHash() const;
virtual bool HasIndexableSubshapes() const override;
virtual size_t GetIndexableSubshapeCount() const override;
virtual void GetIndexableSubshapes( std::vector<SHAPE*>& aSubshapes ) override;
/**
* Convert a global vertex index ---i.e., a number that globally identifies a vertex in a
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* concatenated list of all vertices in all contours--- and get the index of the vertex
* relative to the contour relative to the polygon in which it is.
*
* @param aGlobalIdx is the global index of the corner whose structured index wants to
* be found
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* @param aRelativeIndices is a pointer to the set of relative indices to store.
* @return true if the global index is correct and the information in \a aRelativeIndices
* is valid; false otherwise.
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*/
bool GetRelativeIndices( int aGlobalIdx, VERTEX_INDEX* aRelativeIndices ) const;
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/**
* Compute the global index of a vertex from the relative indices of polygon, contour and
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* vertex.
*
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* @param aRelativeIndices is the set of relative indices.
* @param aGlobalIdx [out] is the computed global index.
* @return true if the relative indices are correct; false otherwise. The computed
* global index is returned in the \p aGlobalIdx reference.
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*/
bool GetGlobalIndex( VERTEX_INDEX aRelativeIndices, int& aGlobalIdx ) const;
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/// @copydoc SHAPE::Clone()
SHAPE* Clone() const override;
///< Creates a new empty polygon in the set and returns its index
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int NewOutline();
///< Creates a new hole in a given outline
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int NewHole( int aOutline = -1 );
///< Adds a new outline to the set and returns its index
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int AddOutline( const SHAPE_LINE_CHAIN& aOutline );
///< Adds a new hole to the given outline (default: last) and returns its index
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int AddHole( const SHAPE_LINE_CHAIN& aHole, int aOutline = -1 );
///< Return the area of this poly set
double Area();
///< Count the number of arc shapes present
int ArcCount() const;
///< Appends all the arcs in this polyset to \a aArcBuffer
void GetArcs( std::vector<SHAPE_ARC>& aArcBuffer ) const;
///< Removes all arc references from all the outlines and holes in the polyset
void ClearArcs();
///< Appends a vertex at the end of the given outline/hole (default: the last outline)
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/**
* Add a new vertex to the contour indexed by \p aOutline and \p aHole (defaults to the
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* outline of the last polygon).
*
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* @param x is the x coordinate of the new vertex.
* @param y is the y coordinate of the new vertex.
* @param aOutline is the index of the polygon.
* @param aHole is the index of the hole (-1 for the main outline),
* @param aAllowDuplication is a flag to indicate whether it is allowed to add this
* corner even if it is duplicated.
* @return the number of corners of the selected contour after the addition.
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*/
int Append( int x, int y, int aOutline = -1, int aHole = -1, bool aAllowDuplication = false );
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///< Merge polygons from two sets.
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void Append( const SHAPE_POLY_SET& aSet );
///< Append a vertex at the end of the given outline/hole (default: the last outline)
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void Append( const VECTOR2I& aP, int aOutline = -1, int aHole = -1 );
/**
* Append a new arc to the contour indexed by \p aOutline and \p aHole (defaults to the
* outline of the last polygon).
* @param aArc The arc to be inserted
* @param aOutline Index of the polygon
* @param aHole Index of the hole (-1 for the main outline)
* @return the number of points in the arc (including the interpolated points from the arc)
*/
int Append( SHAPE_ARC& aArc, int aOutline = -1, int aHole = -1 );
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/**
* Adds a vertex in the globally indexed position \a aGlobalIndex.
*
* @param aGlobalIndex is the global index of the position in which the new vertex will be
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* inserted.
* @param aNewVertex is the new inserted vertex.
*/
void InsertVertex( int aGlobalIndex, const VECTOR2I& aNewVertex );
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///< Return the index-th vertex in a given hole outline within a given outline
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const VECTOR2I& CVertex( int aIndex, int aOutline, int aHole ) const;
///< Return the aGlobalIndex-th vertex in the poly set
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const VECTOR2I& CVertex( int aGlobalIndex ) const;
///< Return the index-th vertex in a given hole outline within a given outline
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const VECTOR2I& CVertex( VERTEX_INDEX aIndex ) const;
/**
* Return the global indexes of the previous and the next corner of the \a aGlobalIndex-th
* corner of a contour in the polygon set.
*
* They are often aGlobalIndex-1 and aGlobalIndex+1, but not for the first and last
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* corner of the contour.
*
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* @param aGlobalIndex is index of the corner, globally indexed between all edges in all
* contours
* @param aPrevious is the globalIndex of the previous corner of the same contour.
* @param aNext is the globalIndex of the next corner of the same contour.
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* @return true if OK, false if aGlobalIndex is out of range
*/
bool GetNeighbourIndexes( int aGlobalIndex, int* aPrevious, int* aNext );
/**
* Check whether the aPolygonIndex-th polygon in the set is self intersecting.
*
* @param aPolygonIndex is the index of the polygon that wants to be checked.
* @return true if the \a aPolygonIndex-th polygon is self intersecting, false otherwise.
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*/
bool IsPolygonSelfIntersecting( int aPolygonIndex ) const;
/**
* Check whether any of the polygons in the set is self intersecting.
*
* @return true if any of the polygons is self intersecting, false otherwise.
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*/
bool IsSelfIntersecting() const;
///< Return the number of triangulated polygons
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unsigned int TriangulatedPolyCount() const { return m_triangulatedPolys.size(); }
///< Return the number of outlines in the set
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int OutlineCount() const { return m_polys.size(); }
///< Return the number of vertices in a given outline/hole
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int VertexCount( int aOutline = -1, int aHole = -1 ) const;
///< Returns the number of holes in a given outline
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int HoleCount( int aOutline ) const
{
if( ( aOutline < 0 ) || ( aOutline >= (int) m_polys.size() )
|| ( m_polys[aOutline].size() < 2 ) )
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return 0;
// the first polygon in m_polys[aOutline] is the main contour,
// only others are holes:
return m_polys[aOutline].size() - 1;
}
///< Return the reference to aIndex-th outline in the set
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SHAPE_LINE_CHAIN& Outline( int aIndex )
{
return m_polys[aIndex][0];
}
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const SHAPE_LINE_CHAIN& Outline( int aIndex ) const
{
return m_polys[aIndex][0];
}
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/**
* Return a subset of the polygons in this set, the ones between \a aFirstPolygon and
* \a aLastPolygon.
*
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* @param aFirstPolygon is the first polygon to be included in the returned set.
* @param aLastPolygon is the last polygon to be excluded of the returned set.
* @return a set containing the polygons between \a aFirstPolygon (included)
* and \a aLastPolygon (excluded).
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*/
SHAPE_POLY_SET Subset( int aFirstPolygon, int aLastPolygon );
SHAPE_POLY_SET UnitSet( int aPolygonIndex )
{
return Subset( aPolygonIndex, aPolygonIndex + 1 );
}
///< Return the reference to aHole-th hole in the aIndex-th outline
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SHAPE_LINE_CHAIN& Hole( int aOutline, int aHole )
{
return m_polys[aOutline][aHole + 1];
}
///< Return the aIndex-th subpolygon in the set
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POLYGON& Polygon( int aIndex )
{
return m_polys[aIndex];
}
const POLYGON& Polygon( int aIndex ) const
{
return m_polys[aIndex];
}
const TRIANGULATED_POLYGON* TriangulatedPolygon( int aIndex ) const
{
return m_triangulatedPolys[aIndex].get();
}
const SHAPE_LINE_CHAIN& COutline( int aIndex ) const
{
return m_polys[aIndex][0];
}
const SHAPE_LINE_CHAIN& CHole( int aOutline, int aHole ) const
{
return m_polys[aOutline][aHole + 1];
}
const POLYGON& CPolygon( int aIndex ) const
{
return m_polys[aIndex];
}
/**
* Return an object to iterate through the points of the polygons between \p aFirst and
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* \p aLast.
*
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* @param aFirst is the first polygon whose points will be iterated.
* @param aLast is the last polygon whose points will be iterated.
* @param aIterateHoles is a flag to indicate whether the points of the holes should be
* iterated.
* @return ITERATOR - the iterator object.
*/
ITERATOR Iterate( int aFirst, int aLast, bool aIterateHoles = false )
{
ITERATOR iter;
iter.m_poly = this;
iter.m_currentPolygon = aFirst;
iter.m_lastPolygon = aLast < 0 ? OutlineCount() - 1 : aLast;
iter.m_currentContour = 0;
iter.m_currentVertex = 0;
iter.m_iterateHoles = aIterateHoles;
return iter;
}
/**
* @param aOutline is the index of the polygon to be iterated.
* @return an iterator object to visit all points in the main outline of the
* \a aOutline-th polygon, without visiting the points in the holes.
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*/
ITERATOR Iterate( int aOutline )
{
return Iterate( aOutline, aOutline );
}
/**
* @param aOutline the index of the polygon to be iterated.
* @return an iterator object to visit all points in the main outline of the
* \a aOutline-th polygon, visiting also the points in the holes.
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*/
ITERATOR IterateWithHoles( int aOutline )
{
return Iterate( aOutline, aOutline, true );
}
/**
* @return an iterator object to visit all points in all outlines of the set,
* without visiting the points in the holes.
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*/
ITERATOR Iterate()
{
return Iterate( 0, OutlineCount() - 1 );
}
/**
* @return an iterator object to visit all points in all outlines of the set,
* visiting also the points in the holes.
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*/
ITERATOR IterateWithHoles()
{
return Iterate( 0, OutlineCount() - 1, true );
}
CONST_ITERATOR CIterate( int aFirst, int aLast, bool aIterateHoles = false ) const
{
CONST_ITERATOR iter;
iter.m_poly = const_cast<SHAPE_POLY_SET*>( this );
iter.m_currentPolygon = aFirst;
iter.m_lastPolygon = aLast < 0 ? OutlineCount() - 1 : aLast;
iter.m_currentContour = 0;
iter.m_currentVertex = 0;
iter.m_iterateHoles = aIterateHoles;
return iter;
}
CONST_ITERATOR CIterate( int aOutline ) const
{
return CIterate( aOutline, aOutline );
}
CONST_ITERATOR CIterateWithHoles( int aOutline ) const
{
return CIterate( aOutline, aOutline, true );
}
CONST_ITERATOR CIterate() const
{
return CIterate( 0, OutlineCount() - 1 );
}
CONST_ITERATOR CIterateWithHoles() const
{
return CIterate( 0, OutlineCount() - 1, true );
}
ITERATOR IterateFromVertexWithHoles( int aGlobalIdx )
{
// Build iterator
ITERATOR iter = IterateWithHoles();
// Get the relative indices of the globally indexed vertex
VERTEX_INDEX indices;
if( !GetRelativeIndices( aGlobalIdx, &indices ) )
throw( std::out_of_range( "aGlobalIndex-th vertex does not exist" ) );
// Adjust where the iterator is pointing
iter.m_currentPolygon = indices.m_polygon;
iter.m_currentContour = indices.m_contour;
iter.m_currentVertex = indices.m_vertex;
return iter;
}
///< Return an iterator object, for iterating between aFirst and aLast outline, with or
///< without holes (default: without)
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SEGMENT_ITERATOR IterateSegments( int aFirst, int aLast, bool aIterateHoles = false )
{
SEGMENT_ITERATOR iter;
iter.m_poly = this;
iter.m_currentPolygon = aFirst;
iter.m_lastPolygon = aLast < 0 ? OutlineCount() - 1 : aLast;
iter.m_currentContour = 0;
iter.m_currentSegment = 0;
iter.m_iterateHoles = aIterateHoles;
return iter;
}
///< Return an iterator object, for iterating between aFirst and aLast outline, with or
///< without holes (default: without)
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CONST_SEGMENT_ITERATOR CIterateSegments( int aFirst, int aLast,
bool aIterateHoles = false ) const
{
CONST_SEGMENT_ITERATOR iter;
iter.m_poly = const_cast<SHAPE_POLY_SET*>( this );
iter.m_currentPolygon = aFirst;
iter.m_lastPolygon = aLast < 0 ? OutlineCount() - 1 : aLast;
iter.m_currentContour = 0;
iter.m_currentSegment = 0;
iter.m_iterateHoles = aIterateHoles;
return iter;
}
///< Return an iterator object, for iterating aPolygonIdx-th polygon edges.
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SEGMENT_ITERATOR IterateSegments( int aPolygonIdx )
{
return IterateSegments( aPolygonIdx, aPolygonIdx );
}
///< Return an iterator object, for iterating aPolygonIdx-th polygon edges.
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CONST_SEGMENT_ITERATOR CIterateSegments( int aPolygonIdx ) const
{
return CIterateSegments( aPolygonIdx, aPolygonIdx );
}
///< Return an iterator object, for all outlines in the set (no holes).
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SEGMENT_ITERATOR IterateSegments()
{
return IterateSegments( 0, OutlineCount() - 1 );
}
///< Returns an iterator object, for all outlines in the set (no holes)
CONST_SEGMENT_ITERATOR CIterateSegments() const
{
return CIterateSegments( 0, OutlineCount() - 1 );
}
///< Returns an iterator object, for all outlines in the set (with holes)
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SEGMENT_ITERATOR IterateSegmentsWithHoles()
{
return IterateSegments( 0, OutlineCount() - 1, true );
}
///< Return an iterator object, for the \a aOutline-th outline in the set (with holes).
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SEGMENT_ITERATOR IterateSegmentsWithHoles( int aOutline )
{
return IterateSegments( aOutline, aOutline, true );
}
///< Return an iterator object, for the \a aOutline-th outline in the set (with holes).
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CONST_SEGMENT_ITERATOR CIterateSegmentsWithHoles() const
{
return CIterateSegments( 0, OutlineCount() - 1, true );
}
///< Return an iterator object, for the \a aOutline-th outline in the set (with holes).
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CONST_SEGMENT_ITERATOR CIterateSegmentsWithHoles( int aOutline ) const
{
return CIterateSegments( aOutline, aOutline, true );
}
/**
* Operations on polygons use a \a aFastMode param
* if aFastMode is #PM_FAST (true) the result can be a weak polygon
* if aFastMode is #PM_STRICTLY_SIMPLE (false) (default) the result is (theoretically) a
* strictly simple polygon, but calculations can be really significantly time consuming
* Most of time #PM_FAST is preferable.
* #PM_STRICTLY_SIMPLE can be used in critical cases (Gerber output for instance)
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*/
enum POLYGON_MODE
{
PM_FAST = true,
PM_STRICTLY_SIMPLE = false
};
///< Perform boolean polyset union
///< For \a aFastMode meaning, see function booleanOp
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void BooleanAdd( const SHAPE_POLY_SET& b, POLYGON_MODE aFastMode );
///< Perform boolean polyset difference
///< For \a aFastMode meaning, see function booleanOp
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void BooleanSubtract( const SHAPE_POLY_SET& b, POLYGON_MODE aFastMode );
///< Perform boolean polyset intersection
///< For \a aFastMode meaning, see function booleanOp
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void BooleanIntersection( const SHAPE_POLY_SET& b, POLYGON_MODE aFastMode );
///< Perform boolean polyset union between a and b, store the result in it self
///< For \a aFastMode meaning, see function booleanOp
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void BooleanAdd( const SHAPE_POLY_SET& a, const SHAPE_POLY_SET& b,
POLYGON_MODE aFastMode );
///< Perform boolean polyset difference between a and b, store the result in it self
///< For \a aFastMode meaning, see function booleanOp
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void BooleanSubtract( const SHAPE_POLY_SET& a, const SHAPE_POLY_SET& b,
POLYGON_MODE aFastMode );
///< Perform boolean polyset intersection between a and b, store the result in it self
///< For \a aFastMode meaning, see function booleanOp
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void BooleanIntersection( const SHAPE_POLY_SET& a, const SHAPE_POLY_SET& b,
POLYGON_MODE aFastMode );
enum CORNER_STRATEGY ///< define how inflate transform build inflated polygon
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{
ALLOW_ACUTE_CORNERS, ///< just inflate the polygon. Acute angles create spikes
CHAMFER_ACUTE_CORNERS, ///< Acute angles are chamfered
ROUND_ACUTE_CORNERS, ///< Acute angles are rounded
CHAMFER_ALL_CORNERS, ///< All angles are chamfered.
///< The distance between new and old polygon edges is not
///< constant, but do not change a lot
ROUND_ALL_CORNERS ///< All angles are rounded.
///< The distance between new and old polygon edges is constant
};
/**
* Perform outline inflation/deflation.
*
* Polygons can have holes, but not linked holes with main outlines, if aFactor < 0. For
* those use InflateWithLinkedHoles() to avoid odd corners where the link segments meet
* the outline.
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*
* @param aAmount is the number of units to offset edges.
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* @param aCircleSegCount is the number of segments per 360 degrees to use in curve approx
* @param aCornerStrategy #ALLOW_ACUTE_CORNERS to preserve all angles,
* #CHAMFER_ACUTE_CORNERS to chop angles less than 90°,
* #ROUND_ACUTE_CORNERS to round off angles less than 90°,
* #ROUND_ALL_CORNERS to round regardless of angles
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*/
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void Inflate( int aAmount, int aCircleSegCount,
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CORNER_STRATEGY aCornerStrategy = ROUND_ALL_CORNERS );
void Deflate( int aAmount, int aCircleSegmentsCount,
CORNER_STRATEGY aCornerStrategy = ROUND_ALL_CORNERS )
{
Inflate( -aAmount, aCircleSegmentsCount, aCornerStrategy );
}
/**
* Perform outline inflation/deflation, using round corners.
*
* Polygons can have holes and/or linked holes with main outlines. The resulting
* polygons are also polygons with linked holes to main outlines. For \a aFastMode
* meaning, see function booleanOp .
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*/
void InflateWithLinkedHoles( int aFactor, int aCircleSegmentsCount, POLYGON_MODE aFastMode );
///< Convert a set of polygons with holes to a single outline with "slits"/"fractures"
///< connecting the outer ring to the inner holes
///< For \a aFastMode meaning, see function booleanOp
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void Fracture( POLYGON_MODE aFastMode );
///< Convert a single outline slitted ("fractured") polygon into a set ouf outlines
///< with holes.
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void Unfracture( POLYGON_MODE aFastMode );
///< Return true if the polygon set has any holes.
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bool HasHoles() const;
///< Return true if the polygon set has any holes that share a vertex.
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bool HasTouchingHoles() const;
///< Simplify the polyset (merges overlapping polys, eliminates degeneracy/self-intersections)
///< For \a aFastMode meaning, see function booleanOp
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void Simplify( POLYGON_MODE aFastMode );
/**
* Convert a self-intersecting polygon to one (or more) non self-intersecting polygon(s).
*
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* Removes null segments.
*
* @return the polygon count (always >= 1, because there is at least one polygon)
* There are new polygons only if the polygon count is > 1.
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*/
int NormalizeAreaOutlines();
/// @copydoc SHAPE::Format()
const std::string Format() const override;
/// @copydoc SHAPE::Parse()
bool Parse( std::stringstream& aStream ) override;
/// @copydoc SHAPE::Move()
void Move( const VECTOR2I& aVector ) override;
/**
* Mirror the line points about y or x (or both)
*
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* @param aX If true, mirror about the y axis (flip x coordinate)
* @param aY If true, mirror about the x axis
* @param aRef sets the reference point about which to mirror
*/
void Mirror( bool aX = true, bool aY = false, const VECTOR2I& aRef = { 0, 0 } );
/**
* Rotate all vertices by a given angle.
*
* @param aCenter is the rotation center.
* @param aAngle is the rotation angle in radians.
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*/
void Rotate( double aAngle, const VECTOR2I& aCenter = { 0, 0 } ) override;
/// @copydoc SHAPE::IsSolid()
bool IsSolid() const override
{
return true;
}
const BOX2I BBox( int aClearance = 0 ) const override;
/**
* Check if point \a aP lies on an edge or vertex of some of the outlines or holes.
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*
* @param aP is the point to check.
* @return true if the point lies on the edge of any polygon.
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*/
bool PointOnEdge( const VECTOR2I& aP ) const;
/**
* Check if the boundary of shape (this) lies closer to the shape \a aShape than \a aClearance,
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* indicating a collision.
*
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* @param aShape shape to check collision against
* @param aClearance minimum clearance
* @param aActual [out] an optional pointer to an int to store the actual distance in the
* event of a collision.
* @param aLocation [out] an option pointer to a point to store a nearby location in the
* event of a collision.
* @return true if there is a collision.
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*/
bool Collide( const SHAPE* aShape, int aClearance = 0, int* aActual = nullptr,
VECTOR2I* aLocation = nullptr ) const override;
/**
* Check whether the point \a aP is either inside or on the edge of the polygon set.
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*
* Note that prior to Jul 2020 we considered the edge to *not* be part of the polygon.
* However, most other shapes (rects, circles, segments, etc.) include their edges and
* the difference was causing issues when used for DRC.
*
* (FWIW, SHAPE_LINE_CHAIN was a split personality, with Collide() including its edges
* but PointInside() not. That has also been corrected.)
*
* @param aP is the VECTOR2I point whose collision with respect to the poly set
* will be tested.
* @param aClearance is the security distance; if the point lies closer to the polygon
* than aClearance distance, then there is a collision.
* @param aActual an optional pointer to an int to store the actual distance in the event
* of a collision.
* @return true if the point aP collides with the polygon; false in any other case.
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*/
bool Collide( const VECTOR2I& aP, int aClearance = 0, int* aActual = nullptr,
VECTOR2I* aLocation = nullptr ) const override;
/**
* Check whether the segment \a aSeg collides with the polygon set (or its edge).
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*
* Note that prior to Jul 2020 we considered the edge to *not* be part of the polygon.
* However, most other shapes (rects, circles, segments, etc.) include their edges and
* the difference was causing issues when used for DRC.
*
* (FWIW, SHAPE_LINE_CHAIN was a split personality, with Collide() including its edges
* but PointInside() not. That has also been corrected.)
*
* @param aSeg is the SEG segment whose collision with respect to the poly set
* will be tested.
* @param aClearance is the security distance; if the segment passes closer to the polygon
* than aClearance distance, then there is a collision.
* @param aActual an optional pointer to an int to store the actual distance in the event
* of a collision.
* @return true if the segment aSeg collides with the polygon, false in any other case.
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*/
bool Collide( const SEG& aSeg, int aClearance = 0, int* aActual = nullptr,
VECTOR2I* aLocation = nullptr ) const override;
/**
* Check whether \a aPoint collides with any vertex of any of the contours of the polygon.
*
* @param aPoint is the #VECTOR2I point whose collision with respect to the polygon
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* will be tested.
* @param aClearance is the security distance; if \p aPoint lies closer to a vertex than
* aClearance distance, then there is a collision.
* @param aClosestVertex is the index of the closes vertex to \p aPoint.
* @return bool - true if there is a collision, false in any other case.
*/
bool CollideVertex( const VECTOR2I& aPoint, VERTEX_INDEX& aClosestVertex,
int aClearance = 0 ) const;
/**
* Check whether aPoint collides with any edge of any of the contours of the polygon.
*
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* @param aPoint is the VECTOR2I point whose collision with respect to the polygon
* will be tested.
* @param aClearance is the security distance; if \p aPoint lies closer to a vertex than
* aClearance distance, then there is a collision.
* @param aClosestVertex is the index of the closes vertex to \p aPoint.
* @return bool - true if there is a collision, false in any other case.
*/
bool CollideEdge( const VECTOR2I& aPoint, VERTEX_INDEX& aClosestVertex,
int aClearance = 0 ) const;
/**
* Construct BBoxCaches for Contains(), below.
*
* @note These caches **must** be built before a group of calls to Contains(). They are
* **not** kept up-to-date by editing actions.
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*/
void BuildBBoxCaches() const;
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const BOX2I BBoxFromCaches() const;
/**
* Return true if a given subpolygon contains the point \a aP.
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*
* @param aP is the point to check
* @param aSubpolyIndex is the subpolygon to check, or -1 to check all
* @param aUseBBoxCaches gives faster performance when multiple calls are made with no
* editing in between, but the caller MUST cache the bbox caches
* before calling (via BuildBBoxCaches(), above)
* @return true if the polygon contains the point
*/
bool Contains( const VECTOR2I& aP, int aSubpolyIndex = -1, int aAccuracy = 0,
bool aUseBBoxCaches = false ) const;
///< Return true if the set is empty (no polygons at all)
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bool IsEmpty() const
{
return m_polys.empty();
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}
/**
* Delete the \a aGlobalIndex-th vertex.
*
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* @param aGlobalIndex is the global index of the to-be-removed vertex.
*/
void RemoveVertex( int aGlobalIndex );
/**
* Delete the vertex indexed by \a aRelativeIndex (index of polygon, contour and vertex).
*
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* @param aRelativeIndices is the set of relative indices of the to-be-removed vertex.
*/
void RemoveVertex( VERTEX_INDEX aRelativeIndices );
///< Remove all outlines & holes (clears) the polygon set.
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void RemoveAllContours();
/**
* Delete the \a aContourIdx-th contour of the \a aPolygonIdx-th polygon in the set.
*
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* @param aContourIdx is the index of the contour in the aPolygonIdx-th polygon to be
* removed.
* @param aPolygonIdx is the index of the polygon in which the to-be-removed contour is.
* Defaults to the last polygon in the set.
*/
void RemoveContour( int aContourIdx, int aPolygonIdx = -1 );
/**
* Look for null segments; ie, segments whose ends are exactly the same and deletes them.
*
* @return the number of deleted segments.
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*/
int RemoveNullSegments();
/**
* Accessor function to set the position of a specific point.
*
* @param aIndex #VERTEX_INDEX of the point to move.
* @param aPos destination position of the specified point.
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*/
void SetVertex( const VERTEX_INDEX& aIndex, const VECTOR2I& aPos );
/**
* Set the vertex based on the global index.
*
* Throws if the index doesn't exist.
*
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* @param aGlobalIndex global index of the to-be-moved vertex
* @param aPos New position on the vertex
*/
void SetVertex( int aGlobalIndex, const VECTOR2I& aPos );
///< Return total number of vertices stored in the set.
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int TotalVertices() const;
///< Delete \a aIdx-th polygon from the set.
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void DeletePolygon( int aIdx );
/**
* Return a chamfered version of the \a aIndex-th polygon.
*
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* @param aDistance is the chamfering distance.
* @param aIndex is the index of the polygon to be chamfered.
* @return A polygon containing the chamfered version of the \a aIndex-th polygon.
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*/
POLYGON ChamferPolygon( unsigned int aDistance, int aIndex );
/**
* Return a filleted version of the \a aIndex-th polygon.
*
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* @param aRadius is the fillet radius.
* @param aErrorMax is the maximum allowable deviation of the polygon from the circle
* @param aIndex is the index of the polygon to be filleted
* @return A polygon containing the filleted version of the \a aIndex-th polygon.
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*/
POLYGON FilletPolygon( unsigned int aRadius, int aErrorMax, int aIndex );
/**
* Return a chamfered version of the polygon set.
*
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* @param aDistance is the chamfering distance.
* @return A set containing the chamfered version of this set.
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*/
SHAPE_POLY_SET Chamfer( int aDistance );
/**
* Return a filleted version of the polygon set.
*
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* @param aRadius is the fillet radius.
* @param aErrorMax is the maximum allowable deviation of the polygon from the circle
* @return A set containing the filleted version of this set.
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*/
SHAPE_POLY_SET Fillet( int aRadius, int aErrorMax );
/**
* Compute the minimum distance between the \a aIndex-th polygon and \a aPoint.
*
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* @param aPoint is the point whose distance to the aIndex-th polygon has to be measured.
* @param aIndex is the index of the polygon whose distance to aPoint has to be measured.
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* @param aNearest [out] an optional pointer to be filled in with the point on the
* polyset which is closest to aPoint.
* @return The minimum distance between \a aPoint and all the segments of the \a aIndex-th
* polygon. If the point is contained in the polygon, the distance is zero.
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*/
SEG::ecoord SquaredDistanceToPolygon( VECTOR2I aPoint, int aIndex,
VECTOR2I* aNearest ) const;
/**
* Compute the minimum distance between the aIndex-th polygon and aSegment with a
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* possible width.
*
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* @param aSegment is the segment whose distance to the aIndex-th polygon has to be
* measured.
* @param aIndex is the index of the polygon whose distance to aPoint has to be measured.
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* @param aNearest [out] an optional pointer to be filled in with the point on the
* polyset which is closest to aSegment.
* @return The minimum distance between \a aSegment and all the segments of the \a aIndex-th
* polygon. If the point is contained in the polygon, the distance is zero.
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*/
SEG::ecoord SquaredDistanceToPolygon( const SEG& aSegment, int aIndex,
VECTOR2I* aNearest) const;
/**
* Compute the minimum distance squared between aPoint and all the polygons in the set.
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* Squared distances are used because they avoid the cost of doing square-roots.
*
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* @param aPoint is the point whose distance to the set has to be measured.
* @param aNearest [out] an optional pointer to be filled in with the point on the
* polyset which is closest to aPoint.
* @return The minimum distance squared between aPoint and all the polygons in the set.
* If the point is contained in any of the polygons, the distance is zero.
*/
SEG::ecoord SquaredDistance( VECTOR2I aPoint, VECTOR2I* aNearest = nullptr ) const;
/**
* Compute the minimum distance squared between aSegment and all the polygons in the set.
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* Squared distances are used because they avoid the cost of doing square-roots.
*
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* @param aSegment is the segment whose distance to the polygon set has to be measured.
* @param aSegmentWidth is the width of the segment; defaults to zero.
* @param aNearest [out] an optional pointer to be filled in with the point on the
* polyset which is closest to aSegment.
* @return The minimum distance squared between aSegment and all the polygons in the set.
* If the point is contained in the polygon, the distance is zero.
*/
SEG::ecoord SquaredDistance( const SEG& aSegment, VECTOR2I* aNearest = nullptr ) const;
/**
* Check whether the \a aGlobalIndex-th vertex belongs to a hole.
*
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* @param aGlobalIdx is the index of the vertex.
* @return true if the globally indexed \a aGlobalIdx-th vertex belongs to a hole.
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*/
bool IsVertexInHole( int aGlobalIdx );
private:
void fractureSingle( POLYGON& paths );
void unfractureSingle ( POLYGON& path );
void importTree( ClipperLib::PolyTree* tree,
const std::vector<CLIPPER_Z_VALUE>& aZValueBuffer,
const std::vector<SHAPE_ARC>& aArcBuffe );
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/**
* This is the engine to execute all polygon boolean transforms (AND, OR, ... and polygon
* simplification (merging overlapping polygons).
*
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* @param aType is the transform type ( see ClipperLib::ClipType )
* @param aOtherShape is the SHAPE_LINE_CHAIN to combine with me.
* @param aFastMode is an option to choose if the result can be a weak polygon
* or a strictly simple polygon.
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* if aFastMode is PM_FAST the result can be a weak polygon
* if aFastMode is PM_STRICTLY_SIMPLE (default) the result is (theoretically) a strictly
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* simple polygon, but calculations can be really significantly time consuming
*/
void booleanOp( ClipperLib::ClipType aType, const SHAPE_POLY_SET& aOtherShape,
POLYGON_MODE aFastMode );
void booleanOp( ClipperLib::ClipType aType, const SHAPE_POLY_SET& aShape,
const SHAPE_POLY_SET& aOtherShape, POLYGON_MODE aFastMode );
/**
* Check whether the point \a aP is inside the \a aSubpolyIndex-th polygon of the polyset. If
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* the points lies on an edge, the polygon is considered to contain it.
*
* @param aP is the #VECTOR2I point whose position with respect to the inside of
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* the aSubpolyIndex-th polygon will be tested.
* @param aSubpolyIndex is an integer specifying which polygon in the set has to be
* checked.
* @param aAccuracy accuracy in internal units
* @param aUseBBoxCaches gives faster performance when multiple calls are made with no
* editing in between, but the caller MUST cache the bbox caches
* before calling (via BuildBBoxCaches(), above)
* @return true if \a aP is inside aSubpolyIndex-th polygon; false in any other case.
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*/
bool containsSingle( const VECTOR2I& aP, int aSubpolyIndex, int aAccuracy,
bool aUseBBoxCaches = false ) const;
/**
* Operation ChamferPolygon and FilletPolygon are computed under the private chamferFillet
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* method; this enum is defined to make the necessary distinction when calling this method
* from the public ChamferPolygon and FilletPolygon methods.
*/
enum CORNER_MODE
{
CHAMFERED,
FILLETED
};
/**
* Return the chamfered or filleted version of the \a aIndex-th polygon in the set, depending
* on the \a aMode selected
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* @param aMode represent which action will be taken: CORNER_MODE::CHAMFERED will
* return a chamfered version of the polygon, CORNER_MODE::FILLETED will
* return a filleted version of the polygon.
* @param aDistance is the chamfering distance if aMode = CHAMFERED; if aMode = FILLETED,
* is the filleting radius.
* @param aIndex is the index of the polygon that will be chamfered/filleted.
* @param aErrorMax is the maximum allowable deviation of the polygon from the circle
* if aMode = FILLETED. If aMode = CHAMFERED, it is unused.
* @return the chamfered/filleted version of the polygon.
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*/
POLYGON chamferFilletPolygon( CORNER_MODE aMode, unsigned int aDistance,
int aIndex, int aErrorMax );
///< Return true if the polygon set has any holes that touch share a vertex.
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bool hasTouchingHoles( const POLYGON& aPoly ) const;
MD5_HASH checksum() const;
private:
typedef std::vector<POLYGON> POLYSET;
POLYSET m_polys;
std::vector<std::unique_ptr<TRIANGULATED_POLYGON>> m_triangulatedPolys;
bool m_triangulationValid = false;
MD5_HASH m_hash;
};
#endif // __SHAPE_POLY_SET_H