curve_bezier.hpp
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- /*
- * ===========================================================================
- * PRODUCTION $Log: curve_bezier.hpp,v $
- * PRODUCTION Revision 1000.1 2004/06/01 19:48:41 gouriano
- * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.3
- * PRODUCTION
- * ===========================================================================
- */
- #ifndef GUI_MATH___CURVE_BEZIER__HPP
- #define GUI_MATH___CURVE_BEZIER__HPP
- /* $Id: curve_bezier.hpp,v 1000.1 2004/06/01 19:48:41 gouriano Exp $
- * ===========================================================================
- *
- * PUBLIC DOMAIN NOTICE
- * National Center for Biotechnology Information
- *
- * This software / database is a "United States Government Work" under the
- * terms of the United States Copyright Act. It was written as part of
- * the author's official duties as a United States Government employee and
- * thus cannot be copyrighted. This software / database is freely available
- * to the public for use. The National Library of Medicine and the U.S.
- * Government have not placed any restriction on its use or reproduction.
- *
- * Although all reasonable efforts have been taken to ensure the accuracy
- * and reliability of the software and data, the NLM and the U.S.
- * Government do not and cannot warrant the performance or results that
- * may be obtained by using this software or data. The NLM and the U.S.
- * Government disclaim all warranties, express or implied, including
- * warranties of performance, merchantability or fitness for any particular
- * purpose.
- *
- * Please cite the author in any work or product based on this material.
- *
- * ===========================================================================
- *
- * Authors: Mike DiCuccio
- *
- * File Description:
- *
- */
- #include <gui/math/curve.hpp>
- /** @addtogroup GUI_MATH
- *
- * @{
- */
- BEGIN_NCBI_SCOPE
- class NCBI_GUIMATH_EXPORT CCurveBezier : public ICurve
- {
- public:
- typedef CVect4<TPoint> TControlPoints;
- CCurveBezier();
- /// access a control point
- const TPoint& GetPoint(size_t i) const;
- TPoint& SetPoint(size_t i);
- void SetPoint(size_t i, const TPoint& point);
- //// evaluate the current curve at a given value [0, 1]
- TPoint EvalPos (float u) const;
- TPoint EvalTan (float u) const;
- TPoint EvalCurve(float u) const;
- /// recalculate the curve's parameter matrix
- void Recalc();
- /// access the error
- float GetError(void) const;
- void SetError(float f);
- protected:
- /// error limit
- float m_Error;
- /// the control points of the curve
- TControlPoints m_Points;
- /// The parameter matrix. This is a combination of the basis function and
- /// the control points
- TControlPoints m_ParamMatrix;
- /// evaluate the parameter matrix for the current control points
- const TControlPoints& x_ParamMatrix() const;
- };
- inline
- const CCurveBezier::TPoint& CCurveBezier::GetPoint(size_t i) const
- {
- _ASSERT(i < 4);
- return m_Points[i];
- }
- inline
- CCurveBezier::TPoint& CCurveBezier::SetPoint(size_t i)
- {
- _ASSERT(i < 4);
- return m_Points[i];
- }
- inline
- void CCurveBezier::SetPoint(size_t i, const TPoint& point)
- {
- _ASSERT(i < 4);
- m_Points[i] = point;
- }
- inline
- float CCurveBezier::GetError() const
- {
- return m_Error;
- }
- inline
- void CCurveBezier::SetError(float f)
- {
- m_Error = f;
- }
- inline CCurveBezier::TPoint
- CCurveBezier::EvalPos(float u) const
- {
- _ASSERT(u >= 0 && u <= 1);
- return CVect4<float>(u*u*u, u*u, u, 1) * x_ParamMatrix();
- }
- inline CCurveBezier::TPoint
- CCurveBezier::EvalTan(float u) const
- {
- _ASSERT(u >= 0 && u <= 1);
- return CVect4<float>(u*u, u, 1, 0) * x_ParamMatrix();
- }
- inline CCurveBezier::TPoint
- CCurveBezier::EvalCurve(float u) const
- {
- return CVect4<float>(u, 1, 0, 0) * x_ParamMatrix();
- }
- END_NCBI_SCOPE
- /* @} */
- /*
- * ===========================================================================
- * $Log: curve_bezier.hpp,v $
- * Revision 1000.1 2004/06/01 19:48:41 gouriano
- * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.3
- *
- * Revision 1.3 2004/05/11 18:53:50 dicuccio
- * Added doxygen modules info
- *
- * Revision 1.2 2004/03/11 17:16:28 dicuccio
- * Added export specifiers. Fixed include guards
- *
- * Revision 1.1 2004/03/10 14:02:59 dicuccio
- * Initial revision
- *
- * ===========================================================================
- */
- #endif // GUI_MATH___CURVE_BEZIER__HPP