spline.h

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/**************************************************************************
* This file is part of the Fraqtive program.
* Copyright (C) 2005 Michal Mecinski.
* This program is licensed under the GNU General Public License.
**************************************************************************/
 
#ifndef SPLINE_H
#define SPLINE_H
 
#include <vector>
#include <qsize.h>
#include <qpoint.h>

class Spline
{
public:
        Spline();

        ~Spline();
 
public:
        int getNodesCnt() const
        {
                return _array.size();
        }

        void clear()
        {
                _array.clear();
        }

        int findNode(QSize gradSize, QPoint ptPos, QSize ptSize) const;

        void findSegment(QSize gradSize, QPoint ptPos, int& p1, int& p2) const;
 
 

        void addNode(double x, double y)
        {
                _array.push_back(Coord(x, y));
        }

        int insertNode(double x, double y);

        void setNode(int index, double x, double y)
        {
                _array[index]._x = x;
                _array[index]._y = y;
        }

        void removeNode(int index)
        {
                _array.erase(_array.begin() + index);
        }

        void insertAt(int index)
        {
                _array.insert(_array.begin() + index, Coord());
        }

        double getNodeX(int index) const
        {
                return _array[index]._x;
        }

        double getNodeY(int index) const
        {
                return _array[index]._y;
        }

        double getLimitMin(int index) const
        {
                if (index == 0)
                        return 0.0;
                return _array[index - 1]._x;
        }

        double getLimitMax(int index) const
        {
                if (index == (int)_array.size() - 1)
                        return 1.0;
                return _array[index + 1]._x;
        }

        void invert();

        void generateSpline(double* buffer, int count) const;

        QString toString() const;

        void fromString(const QString& string);
 
private:
        struct Coord
        {
                Coord()
                {
                }
 
                Coord(double x, double y) : _x(x), _y(y)
                {
                }
 
                double _x, _y;
        };
 
        typedef std::vector<Coord> CoordArray;
 
        CoordArray _array;
};
 
#endif