2018-03-08 12:48:29 +00:00
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/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2018 Jean-Pierre Charras, jp.charras at wanadoo.fr
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* Copyright (C) 1992-2018 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/**
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* @file geometry_utils.h
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* @brief a few functions useful in geometry calculations.
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*/
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#ifndef GEOMETRY_UTILS_H
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#define GEOMETRY_UTILS_H
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/**
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* @return the number of segments to approximate a arc by segments
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* with a given max error (this number is >= 1)
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* @param aRadius is the radius od the circle or arc
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* @param aErrorMax is the max error
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* This is the max distance between the middle of a segment and the circle.
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* @param aArcAngleDegree is the arc angle in degrees
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*/
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int GetArcToSegmentCount( int aRadius, int aErrorMax, double aArcAngleDegree );
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/**
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2018-03-22 18:02:45 +00:00
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* @return the correction factor to approximate a circle by segments
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2018-03-08 12:48:29 +00:00
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* @param aSegCountforCircle is the number of segments to approximate the circle
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*
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* When creating a polygon from a circle, the polygon is inside the circle.
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* Only corners are on the circle.
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* This is incorrect when building clearance areas of circles, that need to build
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* the equivalent polygon outside the circle
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* The correction factor is a scaling factor to apply to the radius to build a
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* polygon outside the circle (only the middle of each segment is on the circle
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*/
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double GetCircletoPolyCorrectionFactor( int aSegCountforCircle );
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#endif // #ifndef GEOMETRY_UTILS_H
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