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122 lines
3.4 KiB
122 lines
3.4 KiB
/*
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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 PMSPLINESEGMENT_H
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#define PMSPLINESEGMENT_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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#include <tqvaluelist.h>
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/**
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* Helper class for splines
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*
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* Each instance of this class represents one spline 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 PMSplineSegment
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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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PMSplineSegment( )
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{
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m_a[0] = m_b[0] = m_c[0] = m_d[0] = 0.0;
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m_a[1] = m_b[1] = m_c[1] = m_d[1] = 0.0;
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}
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/**
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* Copy constructor
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*/
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PMSplineSegment( const PMSplineSegment& s )
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{
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int i;
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for( i = 0; i < 2; i++ )
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{
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m_a[i] = s.m_a[i];
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m_b[i] = s.m_b[i];
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m_c[i] = s.m_c[i];
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m_d[i] = s.m_d[i];
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}
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}
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/**
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* Assigns s to the segment
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*/
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PMSplineSegment& operator= ( const PMSplineSegment& s )
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{
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int i;
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for( i = 0; i < 2; i++ )
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{
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m_a[i] = s.m_a[i];
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m_b[i] = s.m_b[i];
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m_c[i] = s.m_c[i];
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m_d[i] = s.m_d[i];
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}
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return *this;
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}
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/**
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* Returns a 2D vector with the point on the spline 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 spline
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*/
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PMVector gradient( double t ) const;
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/**
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* Calculates the spline parameters for the linear spline type
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*/
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void calculateLinear( const PMVector& p1, const PMVector& p2 );
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/**
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* Calculates the spline parameters for the quadratic spline type
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*/
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void calculateQuadratic( const PMVector& p1, const PMVector& p2,
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const PMVector& p3 );
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/**
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* Calculates the spline parameters for the cubic spline type
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*/
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void calculateCubic( const PMVector& p1, const PMVector& p2,
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const PMVector& p3, const PMVector& p4 );
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/**
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* Calculates the spline parameters for the bezier spline type
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*/
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void calculateBezier( const PMVector& p1, const PMVector& p2,
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const PMVector& p3, const PMVector& p4 );
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/**
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* Calculates the spline parameters for the quadric bezier
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*/
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void calculateQuadricBezier( const PMVector& p1, const PMVector& p2,
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const PMVector& p3 );
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private:
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double m_a[2], m_b[2], m_c[2], m_d[2];
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};
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typedef TQValueList<PMSplineSegment> PMSegmentList;
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typedef TQValueList<PMSegmentList> PMSegmentListList;
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#endif
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