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

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2018 CERN
* Copyright (C) 2019-2020 KiCad Developers, see AUTHORS.txt for contributors.
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* @author Tomasz Wlostowski <tomasz.wlostowski@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 __SHAPE_ARC_H
#define __SHAPE_ARC_H
#include <geometry/shape.h>
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#include <convert_to_biu.h>
#include <math/vector2d.h> // for VECTOR2I
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class SHAPE_LINE_CHAIN;
class SHAPE_ARC : public SHAPE
{
public:
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SHAPE_ARC() :
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SHAPE( SH_ARC ),
m_width( 0 )
{};
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/**
* SHAPE_ARC ctor using center, start, angle. Center and angle are used to calculate the mid
* and end points of the arc, and are not stored
* @param aArcCenter is the arc center
* @param aArcStartPoint is the arc start point
* @param aCenterAngle is the arc angle in degrees
* @param aWidth is the arc line thickness
*/
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SHAPE_ARC( const VECTOR2I& aArcCenter, const VECTOR2I& aArcStartPoint, double aCenterAngle,
int aWidth = 0 );
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/**
* SHAPE_ARC ctor.
* @param aArcStart is the arc start point
* @param aArcEnd is the arc end point
* @param aArcMid is the arc mid point
* @param aWidth is the arc line thickness
*/
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SHAPE_ARC( const VECTOR2I& aArcStart, const VECTOR2I& aArcMid, const VECTOR2I& aArcEnd,
int aWidth );
/**
* SHAPE_ARC ctor.
* Builds a SHAPE_ARC which is tangent to two segments and a given radius
* @param aSegmentA is the first segment
* @param aSegmentB is the second segment
* @param aRadius is the arc radius
* @param aWidth is the arc line thickness
*/
SHAPE_ARC( const SEG& aSegmentA, const SEG& aSegmentB, int aRadius, int aWidth = 0 );
SHAPE_ARC( const SHAPE_ARC& aOther );
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virtual ~SHAPE_ARC() {}
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SHAPE* Clone() const override
{
return new SHAPE_ARC( *this );
}
/**
* Constructs this arc from the given start, end and angle.
* @param aStart is the arc starting point
* @param aEnd is the arc endpoint
* @param aAngle is the arc included angle
* @param aWidth is the arc line thickness
* @return *this
*/
SHAPE_ARC& ConstructFromStartEndAngle( const VECTOR2I& aStart, const VECTOR2I& aEnd,
double aAngle, double aWidth = 0 );
const VECTOR2I& GetP0() const { return m_start; }
const VECTOR2I& GetP1() const { return m_end; }
const VECTOR2I& GetArcMid() const { return m_mid; }
VECTOR2I GetCenter() const;
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const BOX2I BBox( int aClearance = 0 ) const override;
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bool Collide( const SEG& aSeg, int aClearance = 0, int* aActual = nullptr,
VECTOR2I* aLocation = nullptr ) const override;
bool Collide( const VECTOR2I& aP, int aClearance = 0, int* aActual = nullptr,
VECTOR2I* aLocation = nullptr ) const override;
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void SetWidth( int aWidth )
{
m_width = aWidth;
}
int GetWidth() const
{
return m_width;
}
bool IsSolid() const override
{
return true;
}
void Move( const VECTOR2I& aVector ) override;
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/**
* Function Rotate
* rotates the arc by a given angle about a point
* @param aCenter is the rotation center
* @param aAngle rotation angle in radians
*/
void Rotate( double aAngle, const VECTOR2I& aCenter ) override;
void Mirror( bool aX = true, bool aY = false, const VECTOR2I& aVector = { 0, 0 } );
void Reverse();
SHAPE_ARC Reversed() const;
double GetRadius() const;
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SEG GetChord() const
{
return SEG( m_start, m_end );
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}
double GetCentralAngle() const;
double GetStartAngle() const;
double GetEndAngle() const;
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/**
* Constructs a SHAPE_LINE_CHAIN of segments from a given arc
* @param aAccuracy maximum divergence from true arc given in internal units
* ** Note that the default is ARC_HIGH_DEF in PCBNew units
* This is to allow common geometry collision functions
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* Other programs should call this using explicit accuracy values
* TODO: unify KiCad internal units
*
* @return a SHAPE_LINE_CHAIN
*/
const SHAPE_LINE_CHAIN ConvertToPolyline( double aAccuracy = 0.005 * PCB_IU_PER_MM ) const;
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private:
bool ccw( const VECTOR2I& aA, const VECTOR2I& aB, const VECTOR2I& aC ) const
{
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return ( ecoord{ aC.y } - aA.y ) * ( ecoord{ aB.x } - aA.x ) >
( ecoord{ aB.y } - aA.y ) * ( ecoord{ aC.x } - aA.x );
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}
void update_bbox();
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private:
VECTOR2I m_start;
VECTOR2I m_mid;
VECTOR2I m_end;
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int m_width;
BOX2I m_bbox;
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};
#endif