68 lines
2.9 KiB
C
68 lines
2.9 KiB
C
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/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (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 (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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****************************************************************************/
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#ifndef __VCGLIB_INTERSECTION_2
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#define __VCGLIB_INTERSECTION_2
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#include <vcg/space/point2.h>
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#include <vcg/space/triangle2.h>
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/** \addtogroup space */
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/*@{*/
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/**
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Function computing the intersection between couple of geometric primitives in
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2 dimension
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*/
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namespace vcg {
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/// return true if the algle is convex (right rotation)
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template<class SCALAR_TYPE>
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inline bool Convex(const Point2<SCALAR_TYPE> & p0,const Point2<SCALAR_TYPE> & p1,const Point2<SCALAR_TYPE> & p2)
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{
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return (((p0-p1)^(p2-p1))<=0);
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}
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/// interseciton between point and triangle
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template<class SCALAR_TYPE>
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inline bool Intersection( const Triangle2<SCALAR_TYPE> & t,const Point2<SCALAR_TYPE> & p)
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{
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Point2<SCALAR_TYPE> p0=t.P0(0);
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Point2<SCALAR_TYPE> p1=t.P0(1);
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Point2<SCALAR_TYPE> p2=t.P0(2);
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if (!Convex(p0,p1,p2))
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std::swap<Point2<SCALAR_TYPE> >(p1,p2);
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return((Convex(p,p0,p1))&&(Convex(p,p1,p2))&&(Convex(p,p2,p0)));
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//return((Convex(p,p0,p1))&&(Convex(p,p1,p2))&&(Convex(p,p2,p0)));
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}
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} // end namespace
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#endif
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