81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
// llline.h
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/**
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* @file llline.cpp
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* @author Andrew Meadows
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* @brief Simple line for computing nearest approach between two infinite lines
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*
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* $LicenseInfo:firstyear=2006&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_LINE_H
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#define LL_LINE_H
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#include <iostream>
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#include "stdtypes.h"
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#include "v3math.h"
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const F32 DEFAULT_INTERSECTION_ERROR = 0.000001f;
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class LLLine
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{
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public:
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LLLine();
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LLLine( const LLVector3& first_point, const LLVector3& second_point );
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virtual ~LLLine() {};
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void setPointDirection( const LLVector3& first_point, const LLVector3& second_point );
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void setPoints( const LLVector3& first_point, const LLVector3& second_point );
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bool intersects( const LLVector3& point, F32 radius = DEFAULT_INTERSECTION_ERROR ) const;
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// returns the point on this line that is closest to some_point
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LLVector3 nearestApproach( const LLVector3& some_point ) const;
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// returns the point on this line that is closest to other_line
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LLVector3 nearestApproach( const LLLine& other_line ) const;
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friend std::ostream& operator<<( std::ostream& output_stream, const LLLine& line );
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// returns 'true' if this line intersects the plane
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// on success stores the intersection point in 'result'
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bool intersectsPlane( LLVector3& result, const LLLine& plane ) const;
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// returns 'true' if planes intersect, and stores the result
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// the second and third arguments are treated as planes
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// where mPoint is on the plane and mDirection is the normal
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// result.mPoint will be the intersection line's closest approach
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// to first_plane.mPoint
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static bool getIntersectionBetweenTwoPlanes( LLLine& result, const LLLine& first_plane, const LLLine& second_plane );
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const LLVector3& getPoint() const { return mPoint; }
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const LLVector3& getDirection() const { return mDirection; }
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protected:
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// these are protected because some code assumes that the normal is
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// always correct and properly normalized.
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LLVector3 mPoint;
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LLVector3 mDirection;
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};
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#endif
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