Dario Sassi
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
//----------------------------------------------------------------------------
|
|
// EgalTech 2013-2013
|
|
//----------------------------------------------------------------------------
|
|
// File : CurveAux.cpp Data : 22.11.13 Versione : 1.3a1
|
|
// Contenuto : Implementazione di alcune funzioni di utilità per le curve.
|
|
//
|
|
//
|
|
//
|
|
// Modifiche : 22.11.13 DS Creazione modulo.
|
|
//
|
|
//
|
|
//----------------------------------------------------------------------------
|
|
|
|
//--------------------------- Include ----------------------------------------
|
|
#include "stdafx.h"
|
|
#include "CurveAux.h"
|
|
|
|
|
|
//----------------------------------------------------------------------------
|
|
bool
|
|
IsClosed( const ICurve& crvC)
|
|
{
|
|
Point3d ptStart ;
|
|
Point3d ptEnd ;
|
|
|
|
|
|
return ( crvC.GetStartPoint( ptStart) && crvC.GetEndPoint( ptEnd) && AreSamePointNear( ptStart, ptEnd)) ;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
bool
|
|
GetPoint( const ICurve& crvC, double dU, Point3d& ptPos)
|
|
{
|
|
Vector3d vtDer1 ;
|
|
Vector3d vtDer2 ;
|
|
|
|
|
|
return crvC.GetPointD1D2( dU, ptPos, vtDer1, vtDer2) ;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
bool
|
|
GetPointTang( const ICurve& crvC, double dU, Point3d& ptPos, Vector3d& vtTang)
|
|
{
|
|
Vector3d vtDer2 ;
|
|
|
|
|
|
if ( ! crvC.GetPointD1D2( dU, ptPos, vtTang, vtDer2))
|
|
return false ;
|
|
return ( vtTang.Normalize()) ;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------
|
|
bool
|
|
GetPointTangNormCurv( const ICurve& crvC, double dU, Point3d& ptPos, Vector3d& vtT, Vector3d& vtN, double& dCurv)
|
|
{
|
|
double dLenSqD1 ;
|
|
Vector3d vtDer2 ;
|
|
|
|
|
|
if ( ! crvC.GetPointD1D2( dU, ptPos, vtT, vtDer2))
|
|
return false ;
|
|
// se esiste la derivata prima non nulla
|
|
dLenSqD1 = vtT.LenSq() ;
|
|
if ( vtT.Normalize()) {
|
|
// del vettore deriv2^ tengo la sola componente perpendicolare al vettore tangente
|
|
vtN = vtDer2 - ( vtDer2 * vtT) * vtT ;
|
|
if ( vtN.Normalize())
|
|
dCurv = ( vtT ^ vtDer2).Len() / dLenSqD1 ;
|
|
else
|
|
dCurv = 0 ;
|
|
}
|
|
else {
|
|
// se esiste derivata seconda non nulla, definisce la tangente
|
|
if ( vtDer2.Normalize())
|
|
vtT = vtDer2 ;
|
|
vtN.Set( 0, 0, 0) ;
|
|
dCurv = 0 ;
|
|
}
|
|
|
|
return true ;
|
|
}
|