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77 lines
2.1 KiB
77 lines
2.1 KiB
15 years ago
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/*
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**************************************************************************
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description
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--------------------
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copyright : (C) 2002 by Andreas Zehender
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email : zehender@kde.org
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**************************************************************************
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**************************************************************************
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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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**************************************************************************/
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#ifndef PMSORSEGMENT_H
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#define PMSORSEGMENT_H
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "pmvector.h"
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/**
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* Helper class for sors
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*
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* Each instance of this class represents one sor segment. A point
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* on the segment is given by the equation
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*
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* fi(t) = A[i] * t^3 + B[i] * t^2 + C[i] * t + D[i]
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*
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* with t ranging from 0 to 1.
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*/
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class PMSorSegment
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{
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public:
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/**
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* Standard constructor
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*/
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PMSorSegment( )
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{
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m_a = m_b = m_c = m_d = 0.0;
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}
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/**
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* Constructor that calculates the segment
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*/
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PMSorSegment( const PMVector& p0, const PMVector& p1,
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const PMVector& p2, const PMVector& p3 )
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{
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calculateSor( p0, p1, p2, p3 );
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}
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/**
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* Returns a 2D vector with the point on the sor segment
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*/
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PMVector point( double t ) const;
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/**
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* Returns the gradient on the sor
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*/
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//PMVector gradient( double t ) const;
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/**
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* Calculates the sor parameters
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*/
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void calculateSor( const PMVector& p0, const PMVector& p1,
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const PMVector& p2, const PMVector& p3 );
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private:
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double m_a, m_b, m_c, m_d;
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double m_t, m_s;
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};
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#endif
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