VRS - The Virtual Rendering System

version 3.3

curve.h

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 /**********************************************************************
 VRS - The Virtual Rendering System
 Copyright (C) 2001 Computer Graphics Systems Group at the 
 Hasso-Plattner-Institute, Potsdam, Germany.
 This library is free software; you can redistribute it and/or 
 modify it under the terms of the GNU Lesser General Public 
 License as published by the Free Software Foundation; either 
 version 2.1 of the License, or (at your option) any later version.
 This library is distributed in the hope that it will be useful, but 
 WITHOUT ANY WARRANTY; without even the implied warranty of 
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 See the GNU Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser+ General Public
 License along with this library; if not, write to the FreeSoftware 
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA, 02111-1307, USA.
 **********************************************************************/
// $Id: curve.h 4633 2005-01-03 01:43:11Z klimetschek $
// $Date: 2005-01-03 02:43:11 +0100 (Mon, 03 Jan 2005) $
// $Revision: 4633 $
// $State$
// $Author: klimetschek $
//
// $Log$
// Revision 1.15  2005/01/03 01:43:07  klimetschek
// - modified win32 project layout, splitted vrs.vcproj into vrs_container, vrs_core, vrs_sg, vrs_image, vrs_opengl and vrs_io
// - removed vrs.vcproj
// minor things:
// - added all glutexamples to vrs4glut.sln
// - fixed some problems in glutexamples
// - removed all project references from all VS projects (using solution wide project dependencies instead)
//
// Revision 1.14  2004/11/05 13:58:09  basch
// Class comment changed (Doxygen style)
//
// Revision 1.13  2004/03/12 16:28:38  baumann
// macros VRS_NAMESPACE_BEGIN/_END expanded and removed
//
// Revision 1.12  2003/11/07 14:19:23  kirsch
// removed leading underscore from include guards
//
// Revision 1.11  2003/07/23 17:04:49  baumann
// code cleanup (especially untabified)
//
// Revision 1.10  2003/01/21 21:08:29  skirsch
// moved length calculation to curve
//
// Revision 1.9  2002/07/02 06:12:34  baumann
// VRS::Iterator<T> completely rewritten
//
// Revision 1.8  2002/03/04 11:08:34  kersting
// directory structure changes
//
// Revision 1.7  2002/03/03 21:44:24  kosta
// VRS_TYPEINFO-macro rewritten
//
// Revision 1.6  2002/02/19 10:34:07  kosta
// undone all changes since 2002-02-15
//
// Revision 1.3  2002/01/15 16:25:53  kosta
// macros rewritten for a better namespace support
//
// Revision 1.2  2001/11/13 16:36:30  kirsch
// changed line feed to unix style (removed control-M)
//
// Revision 1.1.1.1  2001/06/08 08:09:20  kirsch
// imported alpha-version by olli 
//


#ifndef VRS_CURVE_H
#define VRS_CURVE_H

#include <vrs/container/iterator.h>
#include <vrs/container/array.h>
#include <vrs/shape.h>

namespace VRS {

class VRS_CORE_API Curve : public Shape {

public:
    virtual Vector curvePoint(double t) const = 0;

    virtual double t2length(double t) const;

    virtual double length2t(double length) const;

    virtual Vector derivative(int degree, double t) const = 0;

    virtual Iterator<Vector>* newIterator(unsigned int resolution) const;
    virtual double getLength() const;

    virtual void modified();

    VRS_TYPEINFO(Curve, Shape);

protected:
    Curve();

private:
    void updateLengthMapping();

    // new method for length mapping
    enum {INITIAL_EVAL_POINTS = 11};
    double getCurveLengthSlidingWindow(double min_t, double max_t, int n_eval_pts);
    double getSectionLength(double t0, double t1, double t2, const Vector& pt0, const Vector& pt1, const Vector& pt2);

    SO<NonPersistentArray<double> > tMapping_;
    SO<NonPersistentArray<double> > lengthMapping_;
    bool updateLengthMapping_;
};

} // namespace VRS

#endif // VRS_CURVE_H

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