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//-*-C++-*-
/*
**************************************************************************
description
--------------------
copyright : (C) 2002 by Andreas Zehender
email : zehender@kde.org
**************************************************************************
**************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
**************************************************************************/
#ifndef PMSORSEGMENT_H
#define PMSORSEGMENT_H
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "pmvector.h"
/**
* Helper class for sors
*
* Each instance of this class represents one sor segment. A point
* on the segment is given by the equation
*
* fi(t) = A[i] * t^3 + B[i] * t^2 + C[i] * t + D[i]
*
* with t ranging from 0 to 1.
*/
class PMSorSegment
{
public:
/**
* Standard constructor
*/
PMSorSegment( )
{
m_a = m_b = m_c = m_d = 0.0;
}
/**
* Constructor that calculates the segment
*/
PMSorSegment( const PMVector& p0, const PMVector& p1,
const PMVector& p2, const PMVector& p3 )
{
calculateSor( p0, p1, p2, p3 );
}
/**
* Returns a 2D vector with the point on the sor segment
*/
PMVector point( double t ) const;
/**
* Returns the gradient on the sor
*/
//PMVector gradient( double t ) const;
/**
* Calculates the sor parameters
*/
void calculateSor( const PMVector& p0, const PMVector& p1,
const PMVector& p2, const PMVector& p3 );
private:
double m_a, m_b, m_c, m_d;
double m_t, m_s;
};
#endif
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