// Description:
//   Bezier curve template consisting of Bezier segments.
//
// Copyright (C) 2001 Frank Becker
//
// 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.
//
// This program 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 General Public License for more details
//
#ifndef _BEZIERCURVE_HPP_
#define _BEZIERCURVE_HPP_

template<class POINT>
class BezierCurve
{
public:
    //Contruct Bezier curve with a given number of points per Bezier segment
    BezierCurve( const int pps);
    //Cleanup
    ~BezierCurve();

    //Set/get control point at given index
    void SetControlPoint( int idx, const POINT &np);
    POINT GetControlPoint( int idx);

    int GetNumControlPoints( void){ return( _numSegments*3+1);}
    int GetNumSegments( void){ return _numSegments;}

    //Set/get points per segments
    void SetPointsPerSegment( const int pps){ _pointsPerSegment = pps;}
    int GetPointsPerSegment( void){ return _pointsPerSegment;}

    //Add a segment to Bezier curve
    void AddSegment( const POINT &p);
    //Delete Bezier segments from-to.
    void DeleteSegments( int fidx, int tidx);

    //Move curve by vector p
    void MoveCurve( const POINT &p);
    //Scale curve by s
    void ScaleCurve( const float s);

    //Get point on curve at time 0<=t<=_numSegments
    void GetPos( float t, POINT &pos);

    //Get tangent for point on curve at time 0<=t<=_numSegments
    void GetTangent( float t, POINT &tangent);

    //Convert Bezier curve to an outline. Outline has to be deleted[] by client
    void ConvertToOutline( POINT *&outline, int &numPoints);
    //Convert partial Bezier curve to an outline. 
    //Outline has to be deleted[] by client.
    void ConvertToOutline(
	    int fidx, int tidx, POINT *&outline, int &numPoints);
    //Convert Bezier curve to an outline with perpendicular vectors. 
    //Outline and pvecs have to be deleted[] by client.
    void ConvertToOutlineWithPVec(
	    POINT *&outline, POINT *&pvecs, int &numPoints);

    //Save Bezier curve to file.
    bool Save( const char *filename);
    //Load Bezier curve from file.
    bool Load( const char *filename);

private:
    BezierCurve( void);
    BezierCurve( const BezierCurve&);
    BezierCurve &operator=(const BezierCurve&);

    POINT *_controlPoints;
    int _numSegments;
    int _pointsPerSegment;
};

#include <BezierCurve.cpp>

#endif