You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
123 lines
3.4 KiB
123 lines
3.4 KiB
//-*-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 PMSPLINESEGMENT_H
|
|
#define PMSPLINESEGMENT_H
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include "pmvector.h"
|
|
#include <tqvaluelist.h>
|
|
|
|
/**
|
|
* Helper class for splines
|
|
*
|
|
* Each instance of this class represents one spline 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 PMSplineSegment
|
|
{
|
|
public:
|
|
/**
|
|
* Standard constructor
|
|
*/
|
|
PMSplineSegment( )
|
|
{
|
|
m_a[0] = m_b[0] = m_c[0] = m_d[0] = 0.0;
|
|
m_a[1] = m_b[1] = m_c[1] = m_d[1] = 0.0;
|
|
}
|
|
/**
|
|
* Copy constructor
|
|
*/
|
|
PMSplineSegment( const PMSplineSegment& s )
|
|
{
|
|
int i;
|
|
for( i = 0; i < 2; i++ )
|
|
{
|
|
m_a[i] = s.m_a[i];
|
|
m_b[i] = s.m_b[i];
|
|
m_c[i] = s.m_c[i];
|
|
m_d[i] = s.m_d[i];
|
|
}
|
|
}
|
|
/**
|
|
* Assigns s to the segment
|
|
*/
|
|
PMSplineSegment& operator= ( const PMSplineSegment& s )
|
|
{
|
|
int i;
|
|
for( i = 0; i < 2; i++ )
|
|
{
|
|
m_a[i] = s.m_a[i];
|
|
m_b[i] = s.m_b[i];
|
|
m_c[i] = s.m_c[i];
|
|
m_d[i] = s.m_d[i];
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
/**
|
|
* Returns a 2D vector with the point on the spline segment
|
|
*/
|
|
PMVector point( double t ) const;
|
|
/**
|
|
* Returns the gradient on the spline
|
|
*/
|
|
PMVector gradient( double t ) const;
|
|
|
|
/**
|
|
* Calculates the spline parameters for the linear spline type
|
|
*/
|
|
void calculateLinear( const PMVector& p1, const PMVector& p2 );
|
|
/**
|
|
* Calculates the spline parameters for the quadratic spline type
|
|
*/
|
|
void calculateQuadratic( const PMVector& p1, const PMVector& p2,
|
|
const PMVector& p3 );
|
|
/**
|
|
* Calculates the spline parameters for the cubic spline type
|
|
*/
|
|
void calculateCubic( const PMVector& p1, const PMVector& p2,
|
|
const PMVector& p3, const PMVector& p4 );
|
|
/**
|
|
* Calculates the spline parameters for the bezier spline type
|
|
*/
|
|
void calculateBezier( const PMVector& p1, const PMVector& p2,
|
|
const PMVector& p3, const PMVector& p4 );
|
|
/**
|
|
* Calculates the spline parameters for the quadric bezier
|
|
*/
|
|
void calculateQuadricBezier( const PMVector& p1, const PMVector& p2,
|
|
const PMVector& p3 );
|
|
|
|
private:
|
|
double m_a[2], m_b[2], m_c[2], m_d[2];
|
|
};
|
|
|
|
typedef TQValueList<PMSplineSegment> PMSegmentList;
|
|
typedef TQValueList<PMSegmentList> PMSegmentListList;
|
|
|
|
#endif
|