//-*-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 #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