kicad/include/bezier_curves.h

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2009-2014 Jean-Pierre Charras, jp.charras at wanadoo.fr
* Copyright (C) 1992-2017 KiCad Developers, see CHANGELOG.TXT for contributors.
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*
* 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
*/
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#ifndef BEZIER_CURVES_H
#define BEZIER_CURVES_H
#include <vector>
#include <wx/gdicmn.h>
/**
* Bezier curves to polygon converter.
* Only quadratic and cubic Bezier curves are handled
*/
class BEZIER_POLY
{
public:
/** cubic Bezier curve */
BEZIER_POLY( int x1, int y1, int x2, int y2, int x3, int y3 )
{
m_ctrlPts.emplace_back( x1, y1 );
m_ctrlPts.emplace_back( x2, y2 );
m_ctrlPts.emplace_back( x3, y3 );
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m_output = nullptr;
m_minSegLen = 0;
}
/** Quadratic and cubic Bezier curve */
BEZIER_POLY( int x1, int y1, int x2, int y2, int x3, int y3, int x4, int y4 )
{
m_ctrlPts.emplace_back( x1, y1 );
m_ctrlPts.emplace_back( x2, y2 );
m_ctrlPts.emplace_back( x3, y3 );
m_ctrlPts.emplace_back( x4, y4 );
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m_output = nullptr;
m_minSegLen = 0;
}
BEZIER_POLY( const std::vector<wxPoint>& aControlPoints )
: m_ctrlPts( aControlPoints )
{
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m_output = nullptr;
m_minSegLen = 0;
}
/**
* Converts Bezier curve to a polygon.
* @param aOutput will be used as an output vector storing polygon points.
* @param aMinSegLen is the min dist between 2 successve points.
* It can be used to reduce the number of points.
* (the last point is always generated)
*/
void GetPoly( std::vector<wxPoint>& aOutput, int aMinSegLen = 0 );
private:
int m_minSegLen;
///> Control points
std::vector<wxPoint> m_ctrlPts;
///> Pointer to the output vector
std::vector<wxPoint>* m_output;
void addSegment( const wxPoint& aSegment )
{
int seglen = std::abs( m_output->back().x - aSegment.x )
+ std::abs( m_output->back().y - aSegment.y );
// m_minSegLen is always > 0, so never store a 0 len segment
if( seglen >= m_minSegLen )
m_output->push_back( aSegment );
}
void recursiveBezier( int x1, int y1, int x2, int y2, int x3, int y3, unsigned int level );
void recursiveBezier( int x1, int y1, int x2, int y2,
int x3, int y3, int x4, int y4, unsigned int level );
// Conversion parameters
constexpr static double angle_tolerance = 0.0;
constexpr static double cusp_limit = 0.0;
constexpr static unsigned int recursion_limit = 12;
constexpr static double approximation_scale = 0.5; // 1
constexpr static double distance_tolerance_square = ( 0.5 / approximation_scale ) * ( 0.5 / approximation_scale );
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constexpr static double curve_collinearity_epsilon = 1e-30;
constexpr static double curve_angle_tolerance_epsilon = 0.0001;
};
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#endif // BEZIER_CURVES_H