VRS - The Virtual Rendering System

version 3.3

bspline.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: bspline.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 1.19  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 1.18  2004/11/05 13:58:09  basch
// Class comment changed (Doxygen style)
//
// Revision 1.17  2004/03/12 16:28:38  baumann
// macros VRS_NAMESPACE_BEGIN/_END expanded and removed
//
// Revision 1.16  2004/01/29 13:42:24  wendland
// set default value for curveDegree to 1
//
// Revision 1.15  2004/01/19 11:43:56  baumann
// serialization mechanism improved
//
// Revision 1.14  2004/01/19 07:28:03  baumann
// serialization mechanism improved
//
// Revision 1.13  2003/11/07 14:19:23  kirsch
// removed leading underscore from include guards
//
// Revision 1.12  2003/01/16 22:21:58  skirsch
// comment improvements
//
// Revision 1.11  2002/10/29 10:32:51  baumann
// macros VRS_CLASSNAME_* and VRS_IMPL_TYPEINFO_* removed
//
// Revision 1.10  2002/03/04 11:08:34  kersting
// directory structure changes
//
// Revision 1.9  2002/03/03 21:44:24  kosta
// VRS_TYPEINFO-macro rewritten
//
// Revision 1.8  2002/02/19 10:34:07  kosta
// undone all changes since 2002-02-15
//
// Revision 1.5  2002/02/05 07:48:24  kosta
// new persistency macros:
//     VRS_SERIALIZABLE(CLASS_NAME);
//     VRS_SERIALIZABLE_ABSTRACT_CLASS(CLASS_NAME);
//     VRS_SERIALIZABLE_NO_SO_CLASS(CLASS_NAME)
//
// Revision 1.4  2002/02/04 13:07:19  kosta
// VRS_SERIALIZABLE macros completely rewritten
//
// 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_BSPLINE_H
#define VRS_BSPLINE_H

#include <vrs/container/array.h>
#include <vrs/curve.h>

namespace VRS {

class VRS_CORE_API BSpline : public Curve {

public:
    BSpline(int curveDegree = 1, bool openCurve = true, Array<Vector>* controlPoints = 0,
       Array<int>* knotArray = 0);

    void setControlPoint(int i, const Vector & p);
    Vector getControlPoint(int i) const;
    int controlPoints() const;
    Iterator<Vector>* newControlPointIterator() const;

    void setKnot(int i, int value);
    int getKnot(int i) const;
    int knots() const;
    Iterator < int > * newKnotIterator() const;

    void insertKnots(int noNewKnots, int knotValue);
    bool knotsConsistent() const;

    void setOpenCurve();
    void setClosedCurve();
    bool isOpen() const;

    void setCachingOn(int tessellation);

    void setCachingOff();
    bool isCached() const;

    void reconfigure(int newDegree, int newNoOfPoints);
    virtual Vector curvePoint(double u) const;

    virtual Vector derivative(int n, double u) const;

    virtual Bounds boundingBox() const;

    virtual void modified();

    VRS_TYPEINFO(BSpline, Curve);
    VRS_SERIALIZABLE(BSpline);

private:
    SO < Array < Vector > > pts_;
    SO < Array < int > > knots_;
    int noOfPts_;
    int noOfKnots_;
    int degree_;
    bool open_;

    std::vector<Vector> cachedValues_;
    int cacheSteps_;
    bool caching_;

    void cacheValues();
    Vector computeValue(double position) const;

    bool modified_;
};

} // namespace VRS

#endif // VRS_BSPLINE_H

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