Dario Sassi
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
//----------------------------------------------------------------------------
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// EgalTech 2013-2013
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//----------------------------------------------------------------------------
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// File : CurveAux.cpp Data : 22.11.13 Versione : 1.3a1
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// Contenuto : Implementazione di alcune funzioni di utilità per le curve.
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//
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//
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//
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// Modifiche : 22.11.13 DS Creazione modulo.
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//
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//
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//----------------------------------------------------------------------------
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//--------------------------- Include ----------------------------------------
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#include "stdafx.h"
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#include "CurveAux.h"
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//----------------------------------------------------------------------------
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bool
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IsClosed( const ICurve& crvC)
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{
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Point3d ptStart ;
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Point3d ptEnd ;
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return ( crvC.GetStartPoint( ptStart) && crvC.GetEndPoint( ptEnd) && AreSamePointNear( ptStart, ptEnd)) ;
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}
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//----------------------------------------------------------------------------
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bool
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GetPoint( const ICurve& crvC, double dU, Point3d& ptPos)
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{
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Vector3d vtDer1 ;
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Vector3d vtDer2 ;
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return crvC.GetPointD1D2( dU, ptPos, vtDer1, vtDer2) ;
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}
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//----------------------------------------------------------------------------
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bool
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GetPointTang( const ICurve& crvC, double dU, Point3d& ptPos, Vector3d& vtTang)
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{
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Vector3d vtDer2 ;
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if ( ! crvC.GetPointD1D2( dU, ptPos, vtTang, vtDer2))
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return false ;
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return ( vtTang.Normalize()) ;
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}
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//----------------------------------------------------------------------------
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bool
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GetPointTangNormCurv( const ICurve& crvC, double dU, Point3d& ptPos, Vector3d& vtT, Vector3d& vtN, double& dCurv)
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{
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double dLenSqD1 ;
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Vector3d vtDer2 ;
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if ( ! crvC.GetPointD1D2( dU, ptPos, vtT, vtDer2))
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return false ;
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dLenSqD1 = vtT.LenSq() ;
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if ( ! vtT.Normalize())
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return false ;
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// del vettore deriv2^ tengo la sola componente perpendicolare al vettore tangente
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vtN = vtDer2 - ( vtDer2 * vtT) * vtT ;
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if ( ! vtN.Normalize())
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return false ;
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// curvatura
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dCurv = ( vtT ^ vtDer2).Len() / dLenSqD1 ;
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return true ;
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}
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